JPH07502567A - Methods, equipment and salts for removing scale from metal strips - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Methods, apparatus and salt removal methods for removing scale from metal strips The present invention generally produces metal 188 strips by treatment with molten alkali salts. ) or relates to a method, apparatus and salt for removing scale from sheets.

l Skin declaration l High temperature in continuous annealing line (annealing 1ine) of manufacturing equipment There are various methods for removing scale from metal strips (or sheets). Are known. One method of removing scale from metal strips is commonly According to this, the rolling or annealing process The undesirable oxidized coating on the outer surface formed during further processing For the purpose of improving the surface of the strip, either for production purposes or as a final product sed (or molten) alkali salts. vinegar To ensure complete removal of kale, the metal strips may be washed, quenched, and and/or by short-term immersion in an acidic bath (i.e. “acid wash”). will be processed. Molten alkali treatment is suitable for stainless steel, nickel, cobalt and T1 used for removing scale from various metal strip alloys such as titanium alloys It can be done.

Various types of equipment are offered in the industry to perform this descaling process. It has been proposed. For example, metal strips can be placed in a bath of mixed alkali metal hydroxides or salts. One tank is used, which is immersed in water. Place the strip into the melting tank or force the melting tank ), typically a metal roll is used to support the metal strip. I can stay. However, with metal rolling, the presence of insoluble particles on the strips and / or the relative movement of the hot strip and the metal rolling material may cause scratches on the surface of the strip. It gets scratched or damaged.

In addition, immersion tanks can be installed in the process line of manufacturing equipment (1) and require a fairly large space. Requires. Furthermore, the descaling salt removes the scale on the strip fairly quickly. In fact, it typically occurs in less time than the time it takes for the steel to pass through the tank. It is clear that it works. Therefore, in continuous annealing line The use of a single tank prevents "over-conditioning" of the strips due to contact with excess salt. ”, the efficiency of removing scale from the metal strip (single blade) is poor (possibly. Overconditioning the surface will make it more difficult to clean the strips during the next acid cleaning step. become.

After the strips leave the annealing furnace, the metal strips are sprayed directly with descaling salt. Spraying methods and equipment (have been developed). Spray systems are commonly used ( This reduces over-adjustment of the strips and facilitates scale oxidation. It may have a stick-relieving, polishing, or scrubbing effect. for example No. 3 to Faler, both owned by the assignee of this invention. ．． 126.301 and 3.174.491. . In this, metal strips are placed under tension throughout the descaling system. Supported. Paler's molten salt requires the use of large amounts of gas such as superheated steam. is sprayed in the spray box. Steam is supplied with a small amount of molten salt passed through the nozzle. The nozzle for supplying the i-shaped salt is located in the center of the strip. It is shown with its back facing towards the opposite surface. steam also , steam is fed into the air inside the oven through a nozzle and heats the entire air. So This completely prevents any un-atomized salt from solidifying and adhering to the strips. be done.

Another method for removing scale from metal strips is described in the US patent by Hlrata et al. No. 4.251.956. In this, the descaling slurry is applied to the surface of the strip from the nozzle array. The nozzle row is connected to the support column and the connecting wood. It has four sets of nozzles installed between the The nozzle row is located on the surface of the strip. a spray angle located at a distance from the surface and at an acute angle to the direction of strip movement; degree and directed toward the surface of the strip.

Additionally, another spray method using multiple nozzles across the width of the strip - type scale removal system is disclosed in US Pat. No. 4,3 by McClanahan et al. No. 61,444 and former Roshima U.S. Patent No. 3,617,039 is shown.

The above descaling system covers the entire surface of the metal strip for descaling. Spraying salt and reducing or eliminating metal rolling contacting the strips However, these systems are not without drawbacks. There isn't. For example, some of these systems are shown in Hjrata requires large arrays of nozzles positioned at various angles to the surface of the strip. do. However, supplying large nozzle rows reduces the overall cost of the descaling system. increase in the number of nozzles and one or more nozzles are damaged or clogged. The possibility increases.

Furthermore, all of the above descaling systems can be easily and easily can be removed from the descaling system, inspected, and repaired or replaced. do not provide a nozzle that As mentioned above, the nozzle is used for a long time. may be prone to damage or jamming and cannot be repaired or replaced. access the nozzle (and associated equipment such as pumps and heaters) That is sometimes necessary. However, if the nozzle is mounted sideways on a metal strip, (as shown in Hirata) to the nozzle. Access can be limited and difficult.

Either way, it can be used effectively and efficiently in the continuous annealing line of manufacturing equipment. Descaling systems that remove scale from strips have always been desirable in the industry. It is.

L beetate! And The present invention provides a method for applying a scale onto a heated metal strip in an annealing line of a manufacturing facility. A novel and useful sprayer with a simple nozzle array for spraying salt removal salts. Leh-type descaling systems, and improved salts for such systems. I will provide a. The nozzle is attached to one side of the metal strip and the entire metal strip is Completely cover the strip by spreading the molten salt across. Additionally, the nozzle can be easily attached to and removed from a spray descaling system. The nozzle (or other nozzle assembly parts) are damaged, jammed, or otherwise unusable. to enable their inspection, repair or replacement.

The spray descaling system of the present invention removes hot metal strips from an annealing furnace. (or sheet) and discharges the strips into the acid cleaning tank. Be prepared. / Zulua.

The assembly involves directing molten salt to one side of the strip to remove scale from the strip. and a lower spray nozzle pair.

The upper pair of nozzles are at an angle to the upper surface of the metal strip and It is directed downward across from one side. On the other hand, the lower pair of nozzles is This also opens the strip from one side, at an angle to the bottom surface of the strip. It is oriented upwards and across. The spray nozzle consists of a strip with a spray bottle. directs the molten salt across the top and bottom surfaces of the metal strip as it passes through the , thereby completely covering the entire metal strip.

The spray nozzle attaches directly to the spray chamber within the nozzle assembly. ing. The spray chamber receives molten salt from the salt furnace and sprays the salt into its molten Equipped with a heater to maintain the condition. The heater also Conduction heats the nozzle to a point above the melting point of the salt, causing the salt to drop out during spraying. Prevent clogging. Both spray chamber and nozzle are suitable The molten salt is preheated before it is introduced into the chamber, allowing the salt to be sprayed. Prevents early solidification in the chamber and/or clogging the nozzle. Stop.

A nozzle assembly including a spray chamber, a nozzle, and a heater is configured to - installed in an opening formed in the side of the box. nozzle assembly , easy for inspection by taking it out of the spray chamber through the opening can be removed from the spray box. The nozzle and related parts are then damaged. Inspect and clean if damaged, clogged, or otherwise unusable. The nozzle assembly may be cleaned, repaired, or replaced and the nozzle assembly must be reinstalled into the spray box. Can be attached.

The improved salts of the present invention are compatible with alkali metal hydroxides and alkali metal hydroxides used in the molten anhydrous state. By containing alkali metal nitrate, the scale on the metal strip or sheet is Adjust the Salt is about 40% to about 70% potassium hydroxide, about 20% to about 55% sodium hydroxide and about 2% to about 30% alkali gold g nitrate Contains. More preferably, the salt is about 45% to about 60% potassium hydroxide, about 25% to about 45% sodium hydroxide, about 6% to about 20% alkali metal nitrate Contains acid salts. More specifically, the most preferred embodiment is about 10% alkali Potassium hydroxide and sodium hydroxide with metal nitrates, preferably sodium nitrate Contains a eutectic mixture with um. Salt is particularly sensitive to moving metal strips or sheets. When passing through the spray box, it is suitable to spray on it, but the salt is maintained in a molten state in a tank to form strips, sheets, tubes and bars to be processed. , or other shapes in traditional salt bath applications, such as immersing objects in molten salt baths. can be done.

After the molten salt is applied to the metal strip, it is attached to the wiping area of the spray box. A blown steam wipe spreads molten salt over the entire surface of the strip. spread. Excess molten salt is then drained from the strip into a pan and salted for reuse. It can be returned to the furnace. The spray rinsing water in the rinsing area of the spray box is sprayed onto the surface of the strip. Remove residual salt by pouring water over it.

Thereafter, the strips are placed in a water wash area before being directed to an acid wash tank for further processing. Dry the strips by blowing air and/or steam in the area.

lShodanKorinyaSeri FIG. 1 shows a portion of a spray scale removal system constructed according to the principles of the present invention. FIG. 2 is a schematic partially cutaway perspective view.

FIG. 2 is a schematic plan view of the spray scale removal system of FIG. 1.

FIG. 3 is a schematic side view of the spray scale removal system of FIG. 2.

FIG. 4 shows a spray box substantially along the plane designated by line 4--4 in FIG. It is an enlarged sectional front view of.

FIG. 5 is a graph showing the melting points of various anhydrous salt compositions.

Na, no!　issue date Referring first to Figures 1-3, the spray descaling system generally comprises 1 Indicated by 0. There, the hot metal strip 15 is placed on the processing line of the manufacturing equipment. an annealing furnace (with an output temperature of approximately 2050'F (1121°C) at (not shown) at a predetermined speed. The hot metal strip 15 is then typically enters the cooling section where the strips are heated to approximately 1000'F (538°C) and 1 Cooled to a temperature between 200°F’ (650°C), such as stainless steel Becomes an alloy. However, as will be clear from reading the following specification, the present invention Other alloys that produce an oxidized coating on the surface during processing or other processes ( For example, metal strips formed from titanium, nickel or cobalt (or It can also be applied to sheets) in the same way. The temperatures at which these alloys are cooled are as described above. Things can be a little different.

Metal strips from the cooling section are spray-descaled at the pass-through level of the annealing furnace. Place the spray box, generally designated 25, on the spray system in the direction designated rAJ. pass through. The strips are placed in a roll or roller located away from the spray box. may be supported by a roller (not shown), but preferably passes through a spray box. It is supported by tension during the period of time. When the strip enters the spray box, the strip will be approximately 1 Cool to a temperature between 000°F (538°C) and 1200°F (650°C). Rejected.

The spray box 25 for the spray descaling system is welded at the corners. a steel top wall 26a1 side wall 26b supported on a frame or support structure 3o; It has a box-like heat insulating structure having a bottom wall 26e and a bottom wall 26e. Spray box and flap The frame is constructed using conventional welding and manufacturing techniques and materials. spray The box includes a spray area generally designated 35 and a steam wafer generally designated 37. area, and a flushing area generally indicated at 39 (for both water and air). ). The strips enter the spray box from the cooling section through openings 40. , exits through the opening 41 (FIG. 1) and is further processed, for example in an acid wash bath. . To prevent any salt from escaping from the spray box into the surrounding environment. the metal strips, both above and below the spray box inlet and outlet. Empty box 42 is installed to collect escaped salt spray. It's okay.

The molten salt is sprayed into the spray area of the spray box by applying it to a metal strip. Remove scale from the strips in 35.

To accomplish this, a nozzle assembly, indicated generally at 45, is provided with a spray bottle. It is installed in a hole 47 formed in the side wall 26b of the box 25. See Figure 4 for details. As shown in detail, the nozzle assembly 45 includes a sidewall 52 (FIG. 1), a front wall 54, and a It comprises a stand-alone unit having a spray chamber 50 having a front wall and a rear wall 56.

Side walls 52, front wall 54, and rear wall 56, together with top wall 57 and bottom wall 58, form a liquid-tight enclosure. Form a container. Walls are welded or attached to each other along the edges. preferably with a molten salt, such as nickel or a nickel-based alloy. is made of a material that is non-reactive but conducts heat evenly throughout.

The nozzle assembly 45 is further attached directly to the front wall 54 of the spray chamber 52. It is equipped with a row of nozzles that are cut out. In particular, the nozzle row is mounted on the upper sloped portion 62 of the front wall 54. The attached upper nozzle pair 60A, 60B and the lower inclined part 68 of the front wall 54 are attached. A lower nozzle row 66A, 66B is provided. Upper and lower slopes 62.6 4 is a nozzle 60A.

60B1, 66A, and 66B each face the metal strip 15 at a predetermined angle. It is formed so that it points downward and upward.

Preferably, the nozzle is such that the molten salt sprayed through the nozzle is on the strip and against the top and bottom surfaces of each metal strip so as to impinge on and completely cover the bottom surface. and oriented at an angle of approximately 55° (measured from the face of the strip). The value of a particular angle is Spray salt all over the top and bottom surfaces of the strips as described herein. Except for positioning the nozzles 60A, 60B, 66A, and 66B, not important. The nozzle is installed in the spray chamber towards one side of the strip. the entire length of the strip as it travels through the spray box. Direct the spray.

Nozzles 60A, 60B and 66A, 66B are preferably metal or other thermal Constructed from a conductive material that exchanges heat (i.e., conducts heat) with the front wall of the spray chamber. conductivity) relationship. The nozzle preferably applies melt descaling over the entire surface of the metal strip. It is a flat fan-type hydraulic nozzle that sprays desalination. But the pipe Other conventional nozzle-type devices with openings or holes within the It is also within the scope of this invention to continuously apply molten descaling salt to the surface of the strip. be. In the following, all such nozzle type devices will be generally referred to as "nozzle devices". It is called "S".

Salt is generally sourced from a remote source such as a tank wagon or other storage facility (not shown). and is fed to a salt furnace shown at 73. The salt is preferably U.S. Pat. No. 4, Wood et al., owned by Wood et al. and incorporated herein by reference. No. 455.251 and U.S. Patent No. 4.113.5 to Shoemaker et al. It is added by spray into the salt furnace using the technique described in No. 11.

The salt is heated in a molten state (approximately 500°F (260°C) to 1100°F (593°C) in a salt furnace). ℃)). A salt furnace consists of a heating device (e.g. a burner immersed in salt) Pipe 74a), stirrer 74b1 that continuously circulates molten salt, screen, filter router and/or schematically in Figure 2? Undesirable in salt, denoted by 4e. A sludge pan may be provided to remove dirty impurities.

The molten salt is pumped from the salt furnace 73 into the spray chamber 50 and sprayed onto the metal strips. be played. To accomplish this, a speed variable, preferably indicated generally at 75, is used. An immersion pump operated by a motor is installed along the side of the spray box 25. placed on the floor form 76 and attached thereto by fasteners such as bolts 77. I get kicked. Immersion pumps are traditional in design and are designed to withstand high temperatures and corrosive conditions. Designed to work.

The pump is preferably operated at sgp- at 26 feet of pressure head and is Suction the molten salt from the furnace 73 and send the molten salt to the salt spray via a vibrator or conduit 78. - forcefully introduced into the bottom opening (not referenced) of the chamber. The pump is cold It is equipped with a pump lower 9 and an outlet 80 for circulating water to cool the pump in use. let The preferred type of pump mentioned above is Gusher Pump Co+gpan Manufactured by y (Gaasher Pump Company).

The salt in the spray chamber is on top of the spray chamber! The opening formed in 57 A heater 87 ( Melting by a control system with e.g. electric resistance or gas-fired heaters) maintained in condition. When the heater 87 is activated, it will drain the salt in the spray chamber. at a temperature above its melting point, preferably 500'F (260'C) and 1100° Maintain the temperature between The heater also has direct contact convection by heating the molten salt in the spray chamber, and radiation (i.e. i.e. by directly heating the walls of the chamber before the salt is introduced as described below). heats the walls of the spray chamber. The control system also a thermocouple 85 that can be attached to the spray chamber and extend to the spray chamber; This allows you to sense the temperature of the molten salt in an empty chamber or spray chamber and The heater 87 and timer (not shown) are operated periodically as necessary. It's okay.

Additionally, since the nozzle is attached directly to the spray chamber, the nozzle also It is heated by a heater by conduction through the walls of the play chamber. nozzle and preferably at a temperature above the melting point of the salt, preferably about 900'F (482°C). temperature during the spraying process, especially when salt is kept in the spray chamber. Prevents salt from clogging the nozzle when pumped for the first time.

In fact, before the dip 1 pump supplies molten salt to the spray chamber, the salt scale A "preheat" function is performed for the oil removal system. More specifically, salt melting The heater 87 is activated until a predetermined temperature is obtained in the spray chamber above the point. It will be done. By preheating the chamber, the pump is activated to introduce salt into the chamber. When the salt is initially ``coagulated'' in the chamber walls, Ru. The nozzle can also be heated in this way by conduction through the spray chamber, below the melting point of the salt. is also preheated to a high temperature. Preheating the nozzle also allows the salt to reach the nozzle early. clogging is also prevented.

In operation, the spray chamber and nozzle first reach the melting point of the salt as described above. The temperature is also preheated to a high temperature. After that, the molten salt in the salt furnace is sprayed by the first pump. – supplied to the chamber. Molten salt fills the spray chamber and passes through the nozzle It flows out as a spray. While the immersion pump is operating, the molten salt is under low pressure (approx. psi) through a nozzle. The nozzle sprays molten salt onto the strip. essentially covering the top and bottom surfaces of the strip. Furthermore, for strips The angle at which the nozzle directs the molten salt and the position of the nozzle on the side of the strip Apply salt well over the top and bottom sides of the long pieces. Once the spraying process is complete, The immersion pump is turned off and the salt is pumped into the nozzle and salt chamber before the heater is stopped. and discharge into the salt furnace.

The nozzle assembly 45 is inserted into an opening 47 formed in the side of the spray box. Removably attached. The nozzle assembly 45 is connected to a fastener (e.g. spray chamber and spray Flanges may be attached to one or both of the boxes. nozzle assembly If removal is necessary or desirable, remove the immersion pump from the bulla nodoform 7. Bolts 77 attaching to the nozzle assembly and immersion pump are removed. spray box. The nozzle is installed directly into the spray chamber. attached, so when you remove the nozzle assembly from the spray box, the nozzle Zuru is also removed. As a result, the spray nozzle may become clogged or damaged. Inspect the spray nozzle and replace it if it becomes unusable or unusable. (and/or equipment such as immersion pumps, thermocouples or heaters). or replacement is simple and easy. As an added benefit, immersion pumps can be Once removed, it provides easy access to the salt furnace for inspection.

The characteristics of time, temperature of the strip and salt, amount and composition of salt are Turns out to be the determining factor in the most effective and efficient process for playing are doing. In particular, for alloys containing type 316 stainless steel, approximately 1 s to 1 ．． A reaction time of 5 seconds was found to be suitable for adequate descaling. ing. However, if the salt is in contact with the metal strip for a period of up to 5 seconds, proper scaling will occur. It is believed that removal can be achieved. The reaction time depends on the velocity of the strip (typically 30-400 ft/min (9-120 m/min) and salt spray and steam wash. It is determined by the distance between the

The reaction and reaction time also depend on the temperature of the strip and the temperature of the applied salt.

The temperature of the strip has been found to be the more important of the two. Why This is because the mass of the long piece of steel wire is much larger than the mass of the salt to be applied.

The lower temperature limit for the strip is about 900°F (482°C), which is Determined by reactivity with the surface of the strip, preferably about 700°F (371° For the salt spray of C), it is about 1100°F (593°C) and 700°F. approximately 1200°F (649°C) for salt sprays lower than (371°C). be. The upper limit of the temperature of the strip is the temperature at which a thin strip is rapidly cooled at a high temperature and becomes a strip. Determined by the point at which chemical over-adjustment and deformation occurs, typically around 1300°F ( 704°C).

The choice of salt used depends on several factors. Needless to say, the most important factors that effectively adjust the scale, i.e., at a given temperature and salt of the metal. from the workpiece during the contact time between the scale and the salt on the metal at a given temperature of It is the ability of salt to remove scale. Salt is sufficiently active to perform this function (aggressive). However, the salt is It should not be so active as to "overoxidize" the scale at the exposure temperature and time. do not have. In peroxidized sauce, the scale is adjusted to the final more resistant to subsequent cleaning steps.

Therefore, salts can induce such conditions at selected times and temperatures. It should not be so active that it rubs. Additionally, for several reasons, as much as possible It is desirable to have an effective salt with a low melting point. This allows the spray Improved salt action in the system, reduced energy costs to operate the system, Viscosity is reduced, resulting in reduced drag-out. Therefore, the spray process All of these factors must be considered when selecting a salt for use.

Austenitic stainless steels (e.g. 304 and 316) for descaling and when used in ferritic stainless steels (e.g. 409.430), The molten salt for the descaling system preferably contains about 10% by weight alkali metal nitrate. , preferably sodium hydroxide and potassium hydroxide with sodium nitrate. It is a eutectic salt. The hydroxide eutectic mixture has a weight ratio of 58% KO)I and 4 2% by weight of NaOH, with a molar ratio of 5o-so. The salt of the invention is very It has been found to have a low melting point, approximately 300'F (149°C). Ru. This salt effectively descales within 1.5 seconds and peroxidizes the scale. do not.

However, other ratios of hydroxide to alkali metal nitrate may be used; Efficiency decreases to some extent in certain situations.

such as manufactured by the assignee of the present invention under the trademarks "DOS" and "K6°". Other salts may also be used for descaling. The table below shows commercially available Salt temperature and sample temperature for selected samples with different salt compositions. The results of tests conducted by varying the temperature are shown.

(Margin below) Table 1 Shin T Somura) The experiments listed in Table 1 tested 300 series stainless steel with three commercially available salts. Results of descaling with the compositions, namely DOS, K-6, and KO)l shows. These experiments did not predictably work with KOH and NaOH based salts. It appears that the KOH-based salts are more active. 100% KOH Very effective even in oxidized, hotter strips, but its high Melting A (716°F, limited in use due to high viscosity and high rate of drag-out) There is a lot.

Table I+ below lists various samples of Type 316 stainless steel with several different types. for 1.5 seconds at several different salt and sample temperatures. The results of the evaluation of scale removal obtained by After treatment with salt, the sample is , 5% HNO3 71% HF @ 130°F for 1 second, 3 seconds, and 4 seconds Pickled for a while. Surprisingly, anhydrous KOH with added KNO3 Eutectic salts with NaOH can reduce nitrates, especially at low temperatures down to 500°F. Even though it contains no NaOH, it performs better than salts containing higher KOH%. Ta. Therefore, among this group of salts, the salt of the present invention named LN salt is the best. , followed by anhydrous alko salt (Alko 5alt) named SS, Next is 16 salt. DOS salts have higher strip temperatures and necessarily higher Moderately effective at salt temperatures (due to its high melting point). ) IN and designation The salts used were generally ineffective.

(Margin below) , 1 = engineering LT work twilling The melting points of various salts are: DGS~525°F K-6~394°F LN~300°F SS-640°F (anhydrous) HN~450'F KOH/Na0t (eutectic ~338' FKO) I (anhydrous) ~716°F As mentioned above, it reduces viscosity and reduces drag/guard while providing a wide range of motion. Effectively descales over a range of temperatures (500°F to 1100’F) In order to do this, it is desirable to have a salt with the lowest possible melting point. Therefore Therefore, the eutectic ratio of KOH/NaOH with added nitrate is most effective.

Table II+ below shows the scale adjustment, i.e., the scale of 316 grade stainless steel panels. Figure 3 shows the compositions of various other salt baths used to test kale removal properties.

These steel samples were preheated to 1100°F. In each case salt , to dehydrate the bath by heating to 700°F and 600°F. It was cooled down to. Steel samples were processed at both bath temperatures.

Table 3 shows the evaluation of the composite. (Left below) (Commercially available grades of KOH are: Contains approximately 10% water (H2O), which has an important influence on the manufacturing method of salts containing KOH. Note that we can give ) For salts A, B, C, and D, slowly increase the bath temperature to 500°F. This was done to retain as much water as possible at this temperature (approximately 10%). Te The stop panel was preheated to 1200'F*. 500 panels for each salt °F as shown in Table I, then raise the bath to 600'F and further The panels were processed as shown in Table ■. Then, heat all the cypress to a temperature of 1000'F. to remove moisture, thereby forming an essentially anhydrous tank. the After that, the temperature of the cypress was lowered, and the sample panel was heated to a panel temperature of 1200'F and a bath temperature of 1200'F. Processed at 500°F and 600°F. First heat to 1000°F. Processed in a tank that did not essentially remove all moisture by The panels are identical after removing moisture by heating the bath to 1000°F. Scale adjustment (i.e. descaling) results compared to temperature treated panels was much worse. Therefore, when used for molten salt (yo, descaling) , is strongly (desired) essentially anhydrous. Commercially available grades of KOH are approximately Contains 10% water, so at least about 70% to make it essentially anhydrous Water is removed by heating to above 0°F (depending on how long it is held at that temperature). should be removed, thereby achieving an essentially anhydrous salt bath.

(Margin below) These results demonstrate that NaNOz and NaOH/to01+ eutectic ratios The addition of KNO3 has something in common in scale removal (sample B and (see Section C), and the addition of permanganates, fluorides, and borates significantly (see samples B1, B2, C1 and C2) ). Tests have also shown that the addition of alkali metal nitrates, even at the 2% level also gives a KOH/NaOHOH/NaOH covalent effect (sample A and (see D). These tests also test whether salt is used, if salt is used. showed that it should be essentially anhydrous. These tests also tested KMn It showed the negative effects of Oa. Salts with KMnO4 are those that do not contain KMnOa. The efficiency was very poor compared to comparable salts. For example, salt A, salt D1, salt BZ and Compare salt B1, and salt C2 and salt C1.

Therefore, salt A2, which does not contain KMnOa, is considered to be more effective than salt. It is.

Add sodium nitrate equal to 10%, 20%, 30% and 40% of the total weight of the tank. Tests were conducted with the NaOH/KOH eutectic ratio added to the eutectic layer.

There was no significant difference in the scale removal efficiency of salts with different nitrate concentrations, but nitrate Higher salt concentrations tend to slightly overoxidize the scale, raising the melting point of the salt. Ru.

However, even this overoxidized or overregulated scale is easily removed by acid washing. be removed. Therefore, about 10% to about 20% alkali metal nitrates are preferred. .

In addition, the concentration of NaN0z in the salt Na0)1/KOH/NaNO3 was maintained at 10%. At the same time, we conducted tests by varying the a degree of KO)I. 10% by weight of KOH , 30% by weight, 53% by weight (eutectic mixture ratio) and 70% by weight. Ta. Heat all panels to 1100°F or 1200°F and hold them for 15 seconds each. Soaked in salt at either 00°F or 900°F. Then, water this panel with water. Washed at 140° for 10 s, 15 s, and 25 s in 10% H2sOa. in? ! The IC was cleaned, washed with water, and dried. Descaling is accepted on all panels. It was acceptable. In general, the higher the level of KO)I, the higher the scale removal performance. This is true at KOH levels higher than approximately 53% KOH. It is not particularly noticeable. Additionally, the nature of salts with KOH levels higher than about 53% The slight improvement in performance is due to the significant decrease in melting point due to the decrease in NaOH, as shown in Figure 5. This is more than compensated by. Therefore, KOII/with about 10% nitrate A NaOH eutectic ratio is preferred. Because if it is lower than 10%, the performance This is because some deterioration can be seen in the.

Salt viscosity is a key and important factor for effective descaling is also confirmed. Very simply stated, the lower the viscosity of the salt, the less likely it is to drag out. Therefore, salt losses during operation are lower and costs associated with salt usage are reduced. few. Table 1v below shows the melting points of various salts and Table 1 below shows the melting points of various salts. It shows the viscosity at various temperatures. Table 1 below shows various salt compositions and various salt temperatures. Showing Dora Knob Out. Figure 5 shows the melting points of various salt compositions in graphical form. Bronot.

Wheat! ■ Fusaba 4-Sticky/L (cpl (LzoT plot small Deer V-worker (MeT, Zenkaku) Eutectic of sodium hydroxide and potassium hydroxide containing about 10% sodium nitrate Salts with mixed ratios have extremely low melting points. Table v1 further shows that the salts of the invention So, DOS, sodium hydroxide, and potassium hydroxide can be compared respectively. shows much less dragout at all temperatures. actual, Dora, guaudo is a more expensive salt composition and has a higher melting point. Better than 6.

We also tested the removal of titanium scale.

Eutectic ratio of IOn/NaOH and salt composition of 10% NaNO3 and DOS were used at temperatures of 900°F, 1000'F, and 1100'F (7), respectively. scale was removed from the annealed titanium workpiece.

For 900°DGS, there is no effect on the scale even after 10 seconds of immersion. won. At 1000°F, there was no significant descaling after 1 second, but after 5 After seconds, there was descaling.

Even at 1100'F, descaling after 1 second is not acceptable. It became acceptable only after 2 seconds.

In contrast, the KOH/NaOH eutectic mixture containing 10% NaNO3 The scale removal effect was shown after 1 second at all temperatures including F. therefore , the salts of the present invention are highly effective for rapid descaling of metals other than stainless steel. It is.

In summary, in its broad aspects, the salts of the present invention contain from about 40% to about 70% Contains KOH. If the KOH is less than 40%, the effect of scale action becomes sharper. The viscosity also increases dramatically. Similarly, about 20χ to about 55% sodium hydroxide There should be a

If the sodium hydroxide is greater than 55%, the amount of potassium hydroxide that can be present is reduced. If it is slightly less than 20%, the viscosity increases dramatically. Approximately 2% to 30% of There should be alkali metal nitrates.

If it is less than about 2%, the effectiveness of scale removal will decrease rapidly, and if it is more than about 30%, If not, the viscosity will increase rapidly while the effectiveness will not increase significantly. this wide range The more preferred ranges are about 45x to about 60% potassium hydroxide, about 25x to about 60% potassium hydroxide. With about 45% sodium hydroxide and about 6% to about 20% alkali metal nitrate be. The most preferred composition is about 10% alkali gold, preferably sodium nitrate. This is the eutectic mixture ratio of NaOH/KOH containing nitrates. This allows for optimal Kale removal effect and viscosity are provided.

(upper part of Descaling of austenitic stainless steel ta (e.g. 304 and 316) When used in a descaling system, the molten salt preferably contains about 10% by weight. Eutectic mixture salt of sodium hydroxide and potassium hydroxide with potassium nitrate of It is.

The eutectic mixture has a molar ratio of 58% by weight KO)I and 42% by weight NaOH. So it's 50-50. However, by the assignee of the present invention, "DOS" and Other salts such as those manufactured under the trademark K6° may also be used. The salt is sprayed through a nozzle in molten droplets. But above These salts can also be sprayed as a continuous stream directly impinging on the metal strips, as in -can be applied from a chamber.

Finally, a minimal amount of salt is required to remove scale from hot metal strips. It is. For an effective reaction, a small amount (about 50 grams per square meter of surface) is required. It has been found that the descaling salt of the membrane should preferably be sprayed onto the strips. are doing.

When the descaling salt is applied to the metal strip using the above parameters, the strip Effective and efficient descaling of is achieved. As mentioned above, the present invention It can also be applied to metal strips made from other alloys. Reaction time, strip Although the temperature and amount of salt may vary slightly for these other alloys, , these parameters are well within the knowledge of those skilled in the art and can be easily determined by simple experimentation. determined.

(肱ゆL After the metal strip passes through the spray region 35 and the molten salt is applied to the metal strip, The strip enters the steam wipe area 37 (FIGS. 1-3). Steam wipe area 37 is shown in the table above. A row of steam nozzles oriented downwards in the direction of the surface and in the direction of the lower surface of the metal strip. A row of steam nozzles oriented upwardly so that the descaling reaction takes place. After this, excess molten salt is removed as necessary. steam nozzle The top and bottom rows of approximately 225°F (107°C) to 900°F (482°C) with a pressure of 15 to 40 pounds per square inch on the top and bottom surfaces of the steel shaft strip. Disperse and remove excess salt by directing the steam with force.

The steam nozzle row is fluidly connected to the steam population 102 (FIG. 2) by piping 103. a first set of connected upper steam headers 100A, 100B. header 1 00A, 100B includes a nozzle generally designated 104^ in FIG. This directs steam from inlet 102 downwardly toward the upper surface of the metal strip. nozzle A similar section of the lower steam header with 104B) 100C, 1000 is also , connected to the steam inlet 102, and almost in line with the soda 100^, 100B to the upper steam. At the same location above, direct the steam upward towards the lower surface of the metal strip. Bracket 105A, 105B, and 105C, 105D (Fig. 2) are connected to each other. 100A, 100B, and 100C, 100D on the inner surface of the spray chamber. Attach.

Similarly, the second and third stents 106A, 106B, and 107A and 107B are connected to the first steam and downstream of Noda 100A and 100B. downwardly towards the upper surface of the strip through nozzles 108A, 108B. Add steam to. To the lower steam/soda similar cells 06C, 106D and 1 07C and 107D are also provided, and are supplied through nozzles 108B and 109B, respectively. up toward the bottom surface of the metal strip at approximately the same location as the top steam outlet. Apply steam to the other side. The second and third cents of the header are also 1, (iving 1 03 is fluidly connected to the steam port 102, and the mounting brackets 12A, 11 2B, and 113A and 113B respectively, thereby allowing these headers to be skipped. Attach to the inner surface of the Prevo Nox.

First, second, and third sections 1. Preferably, each of the henodes has an rVJ shape. are attached downwardly outwardly (and upwardly outwardly) to the top and bottom surfaces of the metal strip, respectively. ) to give steam.

The steam force (pushing the salt backwards on the strip as it passes through the spray box) ■The shape makes it easy to apply molten descaling salt to strips of metal. become. Once identified, the first set of top and bottom headers primarily span the entire strip. The second or third cell of the upper and lower headers is mainly metal while dispersing the salt. Push the salt out of the strips.

This action of pushing the salt across the strip is especially important for the upper or lower pair of nozzles. Effectively removes scale from strips when one of the salt spray nozzles is clogged important when doing so. In this case, regardless of the clogged nozzle, the header will Spread the salt over the body, completely covering the strips. Steam heads are used to speed up metal processing. salt reaction on the metal strip by installing the filter further downstream of the spray area. The response time may be maintained within the appropriate parameters described above.

The above steam headers, in particular the second and third steam headers, are made from metal strips, elongated Press the salt into a receiving bowl or pan 120 (FIG. 3) located below the pieces. The reception is The tray extends across the width of the spray box and is placed at an angle to the spray box. The attachment directs the salt to the salt furnace 74 for reuse if desired. Let's go. To accomplish this evacuation during and after the spraying process, the spray chamber must be It is clear that the bar should be mounted higher than the salt furnace. Also, Salts are reacted by flowing them to a discharge point for treatment, recycling, or disposal. It may also be possible to prevent mixed salt from being mixed with unused salt.

After the steam wipe has been applied to the strip, the strip enters the rinsing area 39. Washing area 3 9 includes an upper and lower pair of spray nozzles 138A, 1311B, which direct water onto the top and bottom surfaces of the metal strip, respectively. Water nozzle has steam wipe area Wash the strips of any residual salt that was not removed during the step. The washing area is also , comprising an upper and lower pair of air blowing headers 142A, 142B, which Nozzles (not shown) may be provided and may be shaped to direct air to the upper and lower surfaces of the strip, respectively. The face-up allows the strip to dry before it leaves the flushing area. excess The water is collected by an angled receiving basin 130 and an outgoing basin 146. is discharged through.

Upon exiting the flushing area, the strips exit the spray box and are further sprayed, e.g. Treated in a pickling tank with 10% sulfuric acid at 0°F (54°C), washed with water, soaked in 12% nitric acid and 2% IP acid at °F (49°C) and finally rinsed again with water. dried. Other acid combinations may also be used, as is well known to those skilled in the art.

To operate the spray descaling system, the heater must first be turned on. and the temperature of the spray chamber and nozzle is raised above the melting point of the salt for a predetermined period of time. Bring to temperature. The molten salt from the furnace is then pumped into the spray chamber, Apply to the strip via a nozzle. Excess salt is forced from the strips by steam wiping removed and flushed back to the salt furnace for reuse as usual. Finally, water the strips with water. Rinse and dry in the washing area and remove from the spray box for further processing.

When spraying is complete, stop the immersion pump and turn off the heater in the spray chamber. Before stopping, drain the salt from the nozzle and spray chamber and return it to the salt furnace. Like this This prevents salt from coagulating on the sides of the spray chamber and within the nozzle.

Tests were conducted using stainless steel with an oxidized layer. For example, width 3 fins thick 0.04 inch type 304 stainless steel at 34 ft/min (10,4 When passed through the above spray type descaling system at Good results were obtained in that scale was removed and a bright, highly corrosion-resistant surface was provided. Ta. In addition: Type 304 stainless steel with a width of 32 inches and a thickness of 0.081 inches. with a spray descaling system at 30 ft/min (9 m/min). When passed, good results were also obtained. Additionally, the width is 3 fins thick. 0.04 inch type 304 stainless steel at 50 ft/min (15 ft/min) per minute).

Therefore, as mentioned above, the present invention provides a novel A useful spray descaling system and salts therefor are provided. system The metal strips are processed after the strips emerge from the annealing furnace before being pickled in an acid bath. Effective and efficient to remove scale from. The present invention Standalone that can be easily attached to the kale removal system, removed and inspected A nozzle is provided that is attached to a nozzle assembly. Nozzle and other related parts Items will be repaired or replaced as necessary.

Although the invention has been described in the context of certain preferred embodiments, equivalent variations will occur upon reading the specification. It will be obvious to those skilled in the art that modifications and modifications may be made. For example, annealing conditions , the surrounding atmosphere, and the velocity of the strip are dependent on time, the temperature of the strip and salt, and the What is the amount of salt required to provide an effective and efficient salt descaling system? It can have some impact.

The salts mentioned above are particularly suitable for use in the spray descaling mentioned above.

However, if the salt is maintained in a molten state in the tank, metal strips, bars, tubes, etc. or other shapes can also be used in conventional salt bath equipment, where the salt bath is filled with other shapes.

The present invention includes all such changes and modifications as defined by the following claims. limited.

4-r+' −(■Supreme Procedural amendment 1.Display of the incident PCT/US93107253 1994 Patent Application No. 505496 2. Name of the invention Method, device and salt for removing scale from metal strips 3. Person performing correction Relationship to the incident: Patent applicant Address: Minogan, USA 413223. Detroit, Wes Dow 1st Avenue 12890 Name: Colin Coho Rain Gin 4. Agent Address: 〒540〒540〒540〒Chuo-ku, Osaka City, Osaka Prefecture-T, No. 2-27, L-yu” 2 No. of the statement Page 10, line 9, page 10, lines 11-12, page 10, line 19, page 10, line 24 Correct r60A and 60BJ in the first line to r60a and 60bJ.

L Muyu specification, page 10, lines 10-11, page 10, line 12, page 10, line 19 line, page 1O, line 24, r66A, 66BJ is r66a, 66b Correct it with J.

LL, and on page 22, line 21 of the specification, there is a statement that says, "Evaluation of the composite is shown in Table 3." “The evaluation of the compound is shown in Table Il+. Corrected as J.

6, 2.4 In the 9th column of Table III on page 23 of the specification, it is stated that "C3 or B+ is Correct the phrase ``not in good condition'' with ``not in good condition with CI or B.'' .

6, 2.5 On page 25, line 5 of the specification, ``Samples B1, B2, C1 and C2 are #Refer to sample B+%B8, C1 and C1 I will correct it.

6, 2.6 On page 25, line 13 of the specification, [salt B2 and salt B1, and salt C2 and salt C] Correct IJ to [salt B, salt B1, salt C3, and salt C, J.

6, 2.7 The ``^2'' on page 25, line 14 of the specification has been corrected to ``A.'' vinegar.

Nijimu 1 specification, page 31, line 24, page 32, line 1, page 32, line 5, page 32 On line 8, page 32, line 11, it says [100^, 100BJ, rlooa. Correct it to 100bJ.

6, 2.9 r104AJ on page 32, lines 1 and 2 of the specification is r104. Correct it with aJ.

6.2.10 r104BJ on page 32, line 3 of the specification is r104bJ I will correct it.

LL and rloOc, 100DJ on page 32, line 4 and page 32, line 8 of the specification. Correct it with rloooe and 100dJ.

, 6.2.12 On page 32, line 7 of the specification, "105^, 105B, and l0 5c, 105DJ, r 105a, 105b, and 105e, Corrected to 105dJ.

L Rainbow■ r106A, 106B, and 107^, 1 (17BJ is rloBg, 106b, and l07a, 10]b”.

On page 32, line 12 of the LL Dan specification, it says ``108^, 108BJ''. g, correct it as 109aJ.

r106c, 106D and 107C, 1 on page 32, line 14 of the LL specification Corrected 07DJ to r106e, 106d and 107C%107dJ To do.

rlogB, 109BJ on page 32, line 15 of the LL set specification is r10 Correct it to 8b, 109bJ.

6, 2. On page 32, line 19 of the IV specification, “112^, 112B, and 11 3^, 113BJ is rl12a, 11Zb, and 113a, 11 Correct it to 3bJ.

6, 2.18 The 3rd line of page 34 of the specification says m8A, 138BJ, and it is r13. 8a, 13δb”.

LL ■ r142A, 142BJ on page 34, line 6 of the specification is r142a , corrected to 142bJ.

The scope of the claims 1. Gold with upper and lower surfaces moving at a predetermined speed in an annealing line 1. A method for removing scale from strips, the method comprising the steps of: providing a spray box surrounding a portion of the metal strip in the annealing line; process, Installing the chamber at least partially into the hole formed in the side of the spray box. In the installation process, the chamber is installed in a heat exchange relationship with the chamber. a nozzle device that is connected to the chamber or the nozzle device; If the spray box is damaged or becomes unusable, A mechanical device installed within the spray box so that it can be easily removed through a hole. Cheng, A product for descaling is sprayed into the chamber through the nozzle device. process of supplying the product in a molten state that is soft enough to be passing the metal strip to be processed through the spray box; The molten product for descaling is passed through the nozzle in the spray box. Either the upper surface or the lower surface of the metal strip is connected to the other side through the metal strip. discharging in an amount and for a time sufficient to remove scale from such surface; The molten product for descaling connects the chamber via the nozzle device. to a temperature above the melting point of the product for descaling before and during discharge. The heating step causes the chamber to descale the nozzle device by conduction. heating the metal strip to a temperature above the melting point of the product for The process of removing excess descaling products from the illuminated surface.

2. The method of claim 1, wherein the chamber comprises a heating device. Law: wherein the heating device is configured to heat the nozzle at a temperature between 500 degrees Fahrenheit and 1100 degrees Fahrenheit. a sufficient amount of the descaling liquid to be sprayed through the descaling device; heating the composition in the chamber; The heating device conducts by direct contact, the product for descaling is radiation before being fed into the chamber, and the product for descaling being fed into the chamber. The chamber is also heated by convection while being supplied to the chamber; A thermal device also heats the nozzle device by conduction through the chamber. .

3. said strip is maintained in an essentially horizontal orientation within said spray box; and the nozzle device delivers the product for descaling. one directed towards said upper surface of said metal strip and the other for spraying; comprising a pair of nozzles, the nozzle being directed towards the lower surface of the metal strip. The method described in The molten product for descaling is swept from the top and bottom surfaces of the metal strip. of the metal strip through the pair of nozzles in an amount and for a time sufficient to remove the kale. The method further comprising spraying toward the top and bottom surfaces.

4. The method of claim 3, wherein the chamber is within the spray box. The nozzle connects the metal strip as it passes through the spray box. and the melting for descaling. Product is deposited in front of the metal strip as the strip passes through the spray box. Sprayed by the nozzle from the sides of the upper and lower surfaces and across them. method.

5. The method according to claim 1, wherein the product for descaling is After the molten product for kale removal is sprayed on the face of the strip, The method further comprising the step of spreading across the width of the strip.

6. The method of claim 1, wherein the product for descaling is A method further comprising the step of feeding a salt furnace prior to introduction into the chamber, wherein: the descaling product is spray added to the salt furnace as an aqueous solution; and maintained in a molten state.

7. The method of claim 2, further comprising a thermal sensing device located in the chamber. How to prepare for: wherein the thermal sensing device detects the product for descaling in the chamber; and the temperature before the descaling product is introduced into the chamber. determining the temperature of the chamber and a thermal sensing device to maintain the temperature above the melting point of the product for descaling. Activate the heating device at the appropriate time.

8. The method of claim 7, wherein the method comprises: discharging through the nozzle device; Then, the product for descaling is passed through a salt furnace under controlled pressure. The method further comprising providing a pump device to supply the chamber.

9. The method of claim 5, wherein after a reaction time of 5 seconds or less, from the strip further comprising removing the descaling product by steam wiping. how to.

10. The method of claim FA, wherein the product for descaling comprises: , essentially sodium hydroxide and potassium hydroxide with about 10% by weight potassium nitrate. A method comprising essentially a eutectic mixture with lithium.

A strip of metal having an upper surface and a lower surface moving in a specific metal machining line. A device for removing kale, a chamber containing the product for descaling; heating the chamber; and heating the chamber; The chimney is so soft that the product for kale removal can be discharged through the nozzle device. means for heating the descaling product in the chamber; and a first node fluidly connected to the chamber in heat exchange relationship with the chamber; a heating device, the device being heated by the chamber and discharging the air from the chamber; Descale the molten product for descaling from the shining surface of the metal strip. a first nozzle oriented to discharge onto one side of the metal strip for A device comprising a cheating device.

The upper and lower surfaces are moved at a predetermined speed in the annealing line of the L manufacturing equipment. A system for removing scale from a metal strip having a spray box, for receiving and storing products for descaling a chamber mounted at least partially within the spray box; The chamber is heated and the descaling product is passed through a nozzle device. heating the descaling product in the chamber to a softness that can be imparted by means, and a first node fluidly connected to the chamber in heat exchange relationship with the chamber; a heating device, the device being heated by the chamber and discharging the air from the chamber; The strip passes the molten product through the spray box for descaling. Sometimes one of the metal strips is removed to remove scale from the shining surface of the metal strip. a first nozzle device oriented to discharge in a spray on one side; A device equipped with a chair.

13. The system according to claim 1, wherein the nozzle device a system mounted directly on the chamber and heated by conduction by the chamber; Mu.

1. The system according to claim 1, wherein the system is directly attached to the chamber. a second nozzle device, wherein the second nozzle device is heated by conduction by the chamber, and the scale from the chamber is heated by conduction. oriented to discharge molten product onto another side of said metal strip for removal of metal. I'm being kicked.

The system of claim U, wherein the system is mounted within the spray box. the system further comprising a wiping device configured to After the descaling product has been applied to the strip, The scale removal is applied to the entire surface of the strip by supplying a liquid stream to the surface. Remove excess descaling product from the strip by spreading the descaling product. leave

! 6. The system according to claim 1, wherein the wiping device provides a steam wipe. a system, wherein the liquid stream from the wiping device is a vapor.

A system according to claim 1, wherein the product for descaling is the scale after being removed from the surface of the metal strip by a wiping device; The system further comprises a receiving basin or pan for receiving the product for removal. Mu.

The system according to item (3), wherein the product for descaling is the metal strip for up to 5 seconds before being removed by the liquid stream from the removal device. The nozzle cutting vise removes the scale from the chamber so as to contact the surface of the scale. said sprayer in such a manner as to discharge the product for removal onto the illuminated surface of said metal strip. - the nozzle device and the wiping device on the chamber are connected to the spray box; /stem mounted within the stem.

19. The system of claim 1, wherein the chamber is connected to the spray bottle. the nozzle device may be removably attached to the box, and the nozzle device may be damaged. system that can be removed and replaced if damaged or clogged .

2. The system according to claim 3, wherein the nozzle device attached to the side, and the nozzle cutting vise faces downward and upward, respectively. a system for discharging the product for descaling across the strip at an angle of stem.

21. The system according to claim U-, wherein the generation for descaling The system further comprises a salt furnace for receiving and at least temporarily storing the material. Here, the salt furnace is heated for descaling before being introduced into the chamber. It has heating means to maintain the product in a molten state.

In the L annealing line, a scale removal system is used to remove scale from metal strips. A stem, a spray box through which the metal strip passes in a teriyaki annealing line; and a nozzle barb assembly removably attached to the spray box; , descaling system: Here, the nozzle assembly is a chamber containing a product for descaling; The softness with which the product for descaling can be applied via the nozzle device heating means for heating the product for descaling in the chamber; and the scale from the chamber as the strip passes through the spray chamber; melting products for removal to remove scale from the shining surface of the metal strip; , attached directly to the chamber, oriented to discharge into the face of the metal strip. m, t, The chamber may be damaged or clogged if the nozzle device and the heating means are damaged or clogged. When the nozzle device and the heating The means may be inspected and/or replaced.

A method for treating surface oxides on engineered alloy strips, comprising the steps of: Method: a) While maintaining the temperature of the strip between 1000'F and 1200°F, on the strip in an amount of at least 50 g per square meter of surface in the playing area. a step of discharging salt for descaling, and b) After a reaction time of about 1 to 5 seconds, removing the scale from the illuminated surface of the strip. Process of removing salt.

A process for treating surface oxides on bimetallic strips, which essentially includes the following steps: The process includes: supplying a source of molten salt into a salt furnace, a spray chamber and said spray chamber; preheating the attached nozzle device to a temperature above the melting point of the salt; discharging the salt from the salt furnace into the preheated spray chamber and discharging the salt from the nozzle device; discharging the molten salt onto the strip having a surface to be treated through; and removing excess salt from the strips.

25. The scale described in W, where the organisms for removing the scale 7 include the following: Le, left system: ・20% to about 55% sodium oxide; about 40% to 70% hydroxylated potassium and 2% to 30% alkali metal nitrate.

Scale is removed from a metal strip moving at a predetermined speed in the L annealing line. A method for removing scale, the method comprising the steps of: the material is soft enough that it can be sprayed into the chamber through the nozzle device. a step in which the product for descaling is supplied in a molten state with a degree of heating the chamber to a temperature maintained at providing a nozzle device mounted in heat exchange relationship with the chamber; process, heating the nozzle device by conduction with heat from the heated chamber; Transfer the molten product for descaling to the gold via the heated nozzle device. eject onto the surface of the metal strip in an amount and for a time sufficient to eject onto the illuminated surface of the metal strip. a step of Remove excess scale from the illuminated surface of the metal strip after scale has been removed from the metal strip. Step of removing the product for removal of the product.

A process for removing scale from U-work metal strips, which includes the following steps: The process: supplying a source of molten salt into a salt furnace, a spray chamber and said spray chamber; preheating the attached nozzle device to a temperature above the melting point of the salt; discharging the salt from the salt furnace into the preheated spray chamber and discharging the salt from the nozzle device; discharging the molten salt onto the strip having a surface to be treated through; and removing excess salt from the strips.

A method for descaling bimetallic strips, the method comprising the steps of: : a) while maintaining the temperature of the strip between 1000°F and 1200°F. (Salt for descaling on the strips in an amount of 50 g per square meter of surface) a step of spraying, and b) After a reaction time of about 1 to 5 seconds, removing the scale from the illuminated surface of the strip. Process of removing salt.

29, ``The creatures for leaving the scale include the following! The scale described in 1. Kale, System: ・20% to 55% inodium hydroxide; 2% to 30% alkali gold Salt.

Continuation of front page (81) Designated countries EP (AT, BE, CH, DE.

DK, ES, FR, GB, GR, IE, IT, LU, MC, NL, PT, S E), BR, CA, JP, KR

Claims (34)

[Claims] 1. Gold with top and bottom surfaces moving at a predetermined speed in an annealing line 1. A method for removing scale from a strip, the method comprising the steps of: providing a spray box surrounding a portion of the metal strip in the annealing line; process, Installing the chamber at least partially into the hole formed in the side of the spray box. During the installation process, the nuclear chamber is installed in a heat exchange relationship with the chamber. a nozzle device that is connected to the chamber or the nozzle device; If the spray box is damaged or becomes unusable, A mechanical device installed within the spray box so that it can be easily removed through a hole. Then, the product for descaling is introduced into the core chamber through the nozzle device. supplying in a molten state having sufficient softness to be sprayable; Passing the metal strip to be descaled through the spray box process, The molten product for descaling is passed through the nozzle in the spray box. of the metal strip to either the upper surface or the lower surface of the metal strip through the metal strip. discharging in an amount and for a time sufficient to remove scale from such surface; The molten product for descaling connects the chamber via the nozzle device. to a temperature above the melting point of the product for descaling before and during discharge. The heating step causes the chamber to descale the nozzle device by conduction. heating to a temperature above the melting point of the product for, and removing excess descaling products from the side of the metal strip. 2. 2. The method of claim 1, wherein the chamber comprises a heating device. Law: wherein the heating device is configured to heat the nozzle at a temperature between 500 degrees Fahrenheit and 1100 degrees Fahrenheit. a sufficient amount of the descaling liquid to be sprayed through the descaling device; heating the composition in the chamber; The heating device conducts by direct contact, the product for descaling is radiation before being fed into the chamber, and the product for descaling being fed into the chamber. The chamber is also heated by convection while being supplied to the chamber; A thermal device also heats the nozzle device by conduction through the chamber. . 3. the strip is maintained in an essentially horizontal orientation within the spray box; and the nozzle device delivers the product for descaling. one directed towards said upper surface of said metal strip and the other for spraying; comprising a pair of nozzles, the nozzle being directed towards the lower surface of the metal strip. The method described in , wherein the molten product for descaling is applied to the metal strip. the nozzle pair in an amount and time sufficient to remove scale from the top and bottom surfaces. further comprising the step of spraying toward the top and bottom surfaces of the metal strip through the including a method. 4. 4. The method of claim 3, wherein the chamber is within the spray box. The nozzle connects the metal strip as it passes through the spray box. and the melting for descaling. Product is deposited in front of the metal strip as the strip passes through the spray box. Sprayed by the nozzle from the sides of the upper and lower surfaces and across them. method. 5. 2. The method of claim 1, wherein the product for descaling is After the molten product for kale removal is sprayed on the face of the strip, The method further comprising the step of spreading across the width of the strip. 6. 2. The method of claim 1, wherein the product for descaling is The method further comprises feeding a salt furnace prior to introduction into the chamber: Here, the product for scale removal is sprayed into the salt furnace as an aqueous solution. and maintained in a molten state. 7. 3. The method of claim 2, further comprising a thermal sensing device located in the chamber. How to prepare for: wherein the thermal sensing device detects the product for descaling in the chamber; and the temperature before the descaling product is introduced into the chamber. determining the temperature of the chamber and a thermal sensing device to maintain the temperature above the melting point of the product for descaling. Activate the heating device at the appropriate time. 8. 8. The method of claim 7, wherein the method comprises: discharging through the nozzle device; The product for descaling is removed from the salt furnace under controlled pressure. The method further comprising providing a pump device to supply the chamber. 9. 6. The method of claim 5, wherein after a reaction time of 5 seconds or less, from the strip further comprising removing the descaling product by steam wiping. how to. 10. 2. The method of claim 1, wherein the product for descaling is Qualitatively, sodium hydroxide and potassium hydroxide with about 10% by weight potassium nitrate A method comprising essentially a eutectic mixture with a gum. 11. A strip of metal with an upper and lower surface that moves in a metal processing line. A device for removing scale from a container, the device having a chamber for receiving the product for descaling. heating the chamber and discharging the descaling product into the nozzle device. The product for descaling in the chamber is so soft that it can be discharged through a means for heating, and a first node fluidly connected to the chamber in heat exchange relationship with the chamber; a heating device, the device being heated by the chamber and discharging the air from the chamber; removing scale from the surface of the metal strip with a molten product for descaling; a first nozzle oriented to discharge onto one side of the metal strip for A device comprising a cheating device. 12. The first nozzle device is attached directly to the chamber. The apparatus according to claim 11. 13. 13. The apparatus of claim 12, wherein the first an apparatus comprising two nozzle devices; wherein the second nozzle device is heated by conduction by the metal strip, and the scale is removed from the other side of the metal strip. the descaling product from the chamber to remove the gold oriented to discharge onto another side of the strip. 14. 14. The apparatus of claim 13, wherein the chamber is located on a side surface of the metal strip. and said first and second nozzle devices are mounted on a lower and a lower side, respectively. the product for descaling across the strip at an upwardly directed angle; A device that discharges. 15. 14. The apparatus of claim 13, wherein the chamber is heated and the chamber is heated. Means for heating the product for descaling in the chamber is installed in the chamber. a heater attached and extending inwardly into the chamber. 16. 16. The apparatus of claim 15, wherein the heater the product for descaling in the chamber; and the first and second nozzles. The product for descaling is the product for descaling. heating to a temperature that can be applied through the nozzle device at a temperature higher than the melting point of the equipment. 17. Top and bottom surfaces moving at a predetermined speed in an annealing line of manufacturing equipment. A system for removing scale from a metal strip having a surface, the system comprising: a spray box through which the metal strip passes, receiving the product for descaling; at least partially mounted within the spray box for taking and storing the spray box. chamber, The chamber is heated and the descaling product passes through the nozzle device. Heating the product for descaling in the chamber to a softness that can be imparted through means to do so, and a first node fluidly connected to the chamber in heat exchange relationship with the chamber; a heating device, the device being heated by the chamber and discharging the air from the chamber; The strip passes the molten product through a nuclear spray box for descaling. Sometimes, one of the metal strips is removed to remove scale from the side of the metal strip. a first nozzle device oriented to discharge in a spray on one side; A device equipped with a chair. 18. 18. The system of claim 17, wherein the nozzle device a system that is attached directly to the chamber and heated by conduction by the chamber. Tem. 19. 19. The system of claim 18, wherein the system is attached directly to the chamber. a second nozzle device; wherein the second nozzle device is heated by conduction by the chamber; and transferring the descaling molten product from the chamber to the metal strip. oriented to discharge onto another side of the 20. 20. The system of claim 19, wherein the system is mounted within the spray box. the system further comprising: a wiping device; Here, the wiping device is configured such that the product for descaling is attached to the strip. the metal strip by supplying a liquid stream to said side of the metal strip. Spread the descaling product over the surface of the strip to remove excess scale from the strip. Remove products for kale removal. 21. 21. The system of claim 20, wherein the wiping device comprises a steam wipe. a system, wherein the liquid stream from the wiping device is a vapor. 22. 21. The system of claim 20, wherein the product for descaling is removed from the surface of the metal strip by the wiping device. the system further comprising a receiving pot or van for receiving the product for removal of the oil; stem. 23. 21. The system of claim 20, wherein the product for descaling for up to 5 seconds before being removed by the liquid stream from the wiping device. The nozzle device is removed from the chamber so as to contact the surface of the metal strip. in such a manner as to discharge said descaling product of said material onto said side of said metal strip. , the nozzle device on the spray chamber and the wiping device are connected to the spray chamber. The system is installed inside the box. 24. 20. The system of claim 19, wherein the chamber includes a spray bottle. the nozzle device may be removably attached to the box, and the nozzle device may be damaged. system that can be removed and replaced if damaged or clogged . 25. 25. The system of claim 24, wherein the nozzle device attached to the sides of the long piece, and the nozzle device is located downwardly and upwardly, respectively. Discharge the product for descaling across the strip at an angle facing toward the system. 26. 20. The system of claim 19, wherein the product for descaling the system further comprising a salt furnace for receiving and at least temporarily storing the where the salt furnace is heated for descaling before being introduced into the chamber; It has heating means to maintain the product in a molten state. 27. Descaling is used to remove scale from metal strips in annealing lines. a spray system, the spray passing through which the metal strip passes in the annealing line; a spray box, and a nozzle removably attached to the spray box. a descaling system, comprising an assembly; Here, the nozzle assembly is a chamber containing a product for descaling; The softness with which the product for descaling can be applied via the nozzle device heating means for heating the product for descaling in the chamber; and the scale from the chamber as the strip passes through the spray box; molten products for removal to remove scale from said side of said metal strip; , attached directly to the chamber, oriented to discharge into the face of the metal strip. Equipped with a nozzle device, The chamber may be damaged or clogged if the nozzle device and the heating means are damaged or clogged. When the nozzle device and the heating The means may be inspected and/or replaced. 28. A method of treating a surface oxide on an alloy strip, the method comprising the steps of: ,Method: a) Spray while maintaining the temperature of the strip between 1000°F and 1200°F. Spray onto the strip in an amount of at least 50 g per square meter of surface in the strip area. a step of draining salt for kale removal, and b) After a reaction time of about 1 to 5 seconds, removing the scale from the side of the strip. Process of removing salt. 29. A process for treating surface oxides on alloy strips, which essentially involves the following steps: process: supplying a source of molten salt into a salt furnace; the spray chamber and the nozzle device attached to the spray chamber above the melting point of the salt. preheating to a high temperature, discharging the salt from the salt furnace into the preheated spray chamber; the molten salt onto the strip having the surface to be treated through the nozzle device. and removing excess salt from the strips. 30. Descaling to remove scale from metal strips in annealing lines A system comprising: a spray through which the metal strip passes in the annealing line; a box and a nozzle removably attached to the spray box A descaling system comprising an assembly; Here, the nozzle assembly is Eutectic of sodium hydroxide and potassium hydroxide with about 10% potassium nitrate a chamber containing a molten product for descaling essentially containing a mixture; attached to the chamber, the product for descaling passes through a nozzle device. Adding the product for descaling in the chamber to a softness that can be imparted through heating means, and the scale from the chamber as the strip passes through the spray box; molten products for removal to remove scale from said side of said metal strip; , the chamfer is directed to discharge onto the first side of the metal strip in a spray state; a nozzle device attached directly to the chamber; If the chair and the heating means become damaged or become clogged, the spray box the nozzle device and the heating means for inspection and/or replacement. can be exchanged. 31. Scale from a metal strip moving at a predetermined speed in an annealing line 1. A method for removing , the method comprising the following steps: A product for descaling is sprayed into the chamber through the nozzle device. providing it in a molten state with sufficient softness to be able to be sprayed; heating the chamber to a temperature at which the descaling product is maintained in molten form; The process of providing a nozzle device mounted in heat exchange relationship with the chamber; process, heating the nozzle device by conduction with heat from the heated chamber; Transfer the molten product for descaling to the gold via the heated nozzle device. eject onto the surface of the metal strip in an amount and for a time sufficient to eject onto the surface of the metal strip. of the metal strip after the scale has been removed from the metal strip. removing excess descaling products from the surface. 32. A process for removing scale from metal strips, which includes the following steps: The process: supplying a source of molten salt into a salt furnace, a spray chamber and said spray chamber; preheating the attached nozzle device to a temperature above the melting point of the salt; discharging the salt from the salt furnace into the preheated spray chamber and discharging the salt from the nozzle device; discharging the molten salt onto the strip having a surface to be treated through; and removing excess salt from the strips. 33. A method of descaling a metal strip, comprising the steps of: Method: a) while maintaining the temperature of the strip between 1000°F and 1200°F. Salt for descaling on the strips in an amount of 50 g per square meter of spider surface. and b) after a reaction time of about 1 to 5 seconds, spraying the strip with removing the descaling salt from the surface; 34. A process for removing scale from metal strips, which includes the following steps: to do, process; supplying a source of molten salt into a salt furnace, a spray chamber and said spray chamber; preheating the attached nozzle device to a temperature above the melting point of the salt; discharging the salt from the salt furnace into the preheated spray chamber and discharging the salt from the nozzle device; discharging the molten salt onto the strip to descale the strip through and removing excess salt from the strips.