CN102658301A - Control and modifying unit of scale of hot rolling strip steel - Google Patents
Control and modifying unit of scale of hot rolling strip steel Download PDFInfo
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- CN102658301A CN102658301A CN2012101373062A CN201210137306A CN102658301A CN 102658301 A CN102658301 A CN 102658301A CN 2012101373062 A CN2012101373062 A CN 2012101373062A CN 201210137306 A CN201210137306 A CN 201210137306A CN 102658301 A CN102658301 A CN 102658301A
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Abstract
The invention discloses a control and modifying unit of scale of hot rolling strip steel, comprising an uncoiling mechanism, a spraying and drying device, a withdrawing-straightening device, a heating device, a cooling device, a secondary drying device, a surface passivating and oil-coating device, a winding and pinch roll and a winding machine which are connected in sequence by roller ways, wherein a blowing device is arranged between the withdrawing-straightening device and the heating device; and the winding machine is provided with an edge anti-oxidation spraying device and a weakly-alkaline neutralizer spraying device. The control and modifying unit provided by the invention has the advantages that according to different requirements on the scale structures on the surface of the strip steel, the offline strip steel is unwound again by the unwinding mechanism, the temperature of the strip steel is controlled by the heating device, the cooling rate and the cooling temperature of the strip steel are controlled by the cooling device, and then the needed scale structures which are free from acid cleaning and easy for acid cleaning are obtained; in the scale structure which is free from acid cleaning, the content of Fe3O4 is up to more than 80%, in the scale structure which is easy for acid cleaning, the content of FeO can be up to more than 50%, and the scale structures are superior to the scale structure obtained by the traditional scale control process.
Description
Technical field
The present invention relates to the hot-strip production field, refer to a kind of hot rolling strip steel scale control and modification unit particularly.
Background technology
At present, domestic rolled steel market competition is growing more intense, and product homogeneity is serious, and the user is also harsh day by day to the hot-strip requirement of products.The user all has higher requirements to aspects such as the size of product, form accuracy, mechanical properties; Development and the steel industry " with hot Dai Leng " industrial along with modernization become trend; The user requires also increasingly high to the hot-strip surface quality of products; Like the consideration based on aspects such as cost efficiency and energy-conserving and environment-protective, the user is to the performance of hot-strip product surface iron scale, like the pickling complexity, peel off aspects such as behavior certain requirement is arranged; The pickling steel is exempted from hot rolling, is prone to a series of products such as pickling steel, hot rolling acid-cleaning coiled sheet and is therefore greatly developed by iron and steel producer.
Hot-strip is accompanied by oxidation always in whole process of production, when higher temperature, its scale on surface typical structure is: the Fe that outermost layer is thin
2O
3Layer, middle Fe
3O
4The layer and near the thicker FeO layer of matrix side.When hot-strip was batching that temperature is reduced to below 570 ℃ in the cooling procedure after rolling off the production line, the FeO layer was because thermodynamic instability generation eutectoid reaction generates α ~ Fe+Fe
3O
4Mixture, Fig. 1 is a FeO eutectoid reaction schematic diagram.Performances such as the behavior of peeling off when being with the different structure of steel oxidation iron sheet and forming its pickling performance, distortion all have bigger influence.Iron and steel producer generally produces through the structure of control iron scale and subtracts the pickling steel, exempts from distinguishing products such as pickling steel to satisfy the demand of user to surface quality and performance.
Grant number is that the Chinese invention patent of CN101856669B discloses " a kind of control method of softness of oxide scales on surface of hot-rolling strip steel "; This scheme has proposed hot rolling technology adjustment scheme to different scale structures, controls the reasonable control that the eutectoid reaction degree of FeO finally reaches scale structure through controlling cooling velocity and coiling temperature.Application number is that 201110223714.5 Chinese invention patent discloses " a kind of production method that subtracts the pickling steel "; Propose rationally to utilize TMCP (Thermo Mechanical Control Process: the control of heat machinery) technology; Comprise effective combination of heating, de-scaling, roughing, finish-rolling process, laminar flow cooling, coiling technique, making final iron scale microstructure On-line Control is the structure of easy pickling.These to control devices of scale structure mainly be controlled rolling temperature and mill speed avoid iron sheet broken, reduce thickness of scale, roll the back cooling velocity and coiling temperature is controlled the eutectoid reaction process through adjustment.These means are absorbed in being with the technological parameter of steel to control before batching; Has certain effect; But it is seldom intervened the cooling procedure of batching back band steel fully; Can't suppress eutectoid reaction and can't accommodation zone steel cooling rate, therefore its limitation arranged in control iron scale phase composition and structure aspects.There are some researches show hot-strip when different coiling temperatures are cooled to room temperature with different cooling speed, its scale on surface will present various structure, and will be as shown in Figure 2.Wherein the I class is that a large amount of residual FeO are with some Fe
3O
4Precipitate; The II class is a large amount of residual FeO and the obvious continuous Fe that forms at the FeO/ basal body interface
3O
4Layer has a certain amount of Fe at FeO in mutually
3O
4Separate out; The III class is by Fe
3O
4+ Fe eutectoid thing, Fe
3O
4Precipitated phase and small amount of Fe O mixture are formed.Cooling procedure behind the strip coiling has bigger influence to eutectoid reaction speed and the degree of FeO in its iron scale, and controlling coiling temperature and subsequent cooldown rate well is to obtain the good key of exempting from the pickling scale structure.In addition, a large amount of FeO will left behind mutually when the big cooling rate of use is cooled off, and simultaneously quick cooling can suppress the continuous Fe of the difficult pickling of FeO and basal body interface place
3O
4The formation of layer, final formation is prone to the pickling scale structure.Therefore, can consider through the cooling procedure of batching back band steel is reasonably intervened, thereby realize control, finally obtain having the belt steel product of required surface property its scale structure.
In actual production process; The coiling temperature of hot-strip is generally more than 550 ℃; Thereafter cooling procedure is very slow, and each steel mill is generally the intervention means that batches the cooling of back band steel and adopt and uses the blower fan cooling of drying at present, but this method cooling effectiveness is low excessively.Grant number is that the Chinese patent of CN2579541Y provides " a kind of hot rolled coil cooling device ", and its feature is to adopt cooling water tank, coils of hot-rolled steel is put into water tank cool off, and can make coil of strip realize cooling fast, shortens the finishing cycle greatly.Grant number is that the Chinese patent of CN2579542Y provides " a kind of online forced cooling device of coils of hot-rolled steel "; Its feature is respectively to arrange a pair of nozzle along the holder both sides of the online direction of coil of strip conveyer chain; Hot coil of strip is forced cooling with water under high pressure; Can make coils of hot-rolled steel realize online cooling, thereby shorten the cool time of coil of strip.More than two kinds of forced cooling method cooldown rates have a distinct increment than blower fan blowing cooling; But above method all is with the form cooling of coil of strip with rolling; When coils of hot-rolled steel cooled off in rolling, because the cooling condition difference and the oxygen supply difference of coil of strip different parts, plate wide width portion and middle part iron scale situation were also not quite identical usually; Cause iron scale skewness on the strip width direction; Its performance homogeneity is caused adverse effect, particularly when pickling, cause pickling inhomogeneous easily, cause overpickling.
In addition; Hot-rolled finished product twists in and receives atmospheric corrosion in the storage and transport process easily and drench with rain, local electrochemistry crevice corrosion that condensation causes and make the hot rolled steel plate surface that corrosion or serious " pockmark " corrosion take place; Acid interfacial reaction also takes place with bunch wrap material such as straw mattress, straw rope etc. in belt steel surface easily under wet environment; Thereby cause its surface deterioration, exempt from pickling steel coil of strip because without operation straight formings such as ball blast, sandblast, pickling, the user does not allow its surface situation such as corrosion to occur; Therefore, be necessary when the pickling steel is exempted from production, to do antirust and acid-base neutralization is handled to its surface.
Summary of the invention
The objective of the invention is to provide a kind of comprehensive scale structure control and modification, surface function such as antirust hot-strip to be handled in the unit of one; Production has the hot-rolled strip steel winding of required scale structure, excellent surface properties and quality; The band steel that this unit will just roll off the production line uncoiling is again handled; Can make the cooling condition of coil of strip different parts become controlled and eliminated the oxygen supply difference of coil of strip different parts, the final iron scale that forms along strip width directional performance and structure homogeneous.
For realizing this purpose; Hot rolling strip steel scale control and modification unit that the present invention designed; Comprise the uncoiling mechanism, winding-up drying device, straightening device, heater, cooling device, redrying device, surface passivation and oiling station, coiling clamp roller and the coiling machine that connect successively through roller-way; Wherein, be provided with blow device between said straightening device and the heater, said coiling machine is provided with limit portion anti-oxidation spraying device and alkalescent nertralizer spray equipment.
Further, the import and the exit position of said heater are equipped with temperature measurer, and the exit position of said cooling device also is provided with temperature measurer.
Further, said heater is heat radiation heater or induction heating apparatus.
Further, said cooling device is equipment water jetting cooler or water-air atomizing cooling device.
Further, said uncoiling mechanism comprises uncoiler and the uncoiling pinch roll that connects successively through roller-way.
Beneficial effect of the present invention is:
(1) unit provided by the invention is according to the demands of different to the belt steel surface scale structure; The band steel uncoiling again that to just roll off the production line through uncoiling mechanism; Through heater control belt steel temperature; Through cooling device control band steel cooldown rate and chilling temperature, obtain required exempting from pickling, being prone to the pickling scale structure, exempt from Fe in the pickling scale structure
3O
4Content reaches more than 80%, and FeO can reach more than 50% in the easy pickling scale structure, is superior to the iron sheet structure that obtains through conventional oxidation iron sheet control technology.
(2) the unit provided by the invention band steel that will just roll off the production line again uncoiling handle; Can make the cooling condition of coil of strip different parts become controlled and eliminated the oxygen supply difference of coil of strip different parts, the final iron scale that forms along strip width directional performance and structure homogeneous.
(3) unit provided by the invention can be according to functions such as surperficial performance demands choose reasonable drying, cooling, scale breading, oiling, passivation; Can be used as replenishing of traditional scale structure control technology; The scope of application is wider; Can carry out the production of many steel grades, many specifications, multiple scale structure band steel, the band steel of producing has good surface property, and the band steel mechanical property is had no adverse effect.
Description of drawings
Fig. 1 is the FeO eutectoid reaction schematic diagram that the present invention relates to.
Fig. 2 is the schematic diagram that the control coiling temperature that the present invention relates to and cooling rate obtain different scale structures.
Fig. 3 is the structural representation of hot rolling strip steel scale control of the present invention and modification unit.
Wherein, 1-uncoiler, 2a-uncoiling pinch roll, 2b-coiling clamp roller, 3a-winding-up drying device, 3b-redrying device, 4-straightening device, 5-blow device, 6-temperature measurer, 7-heater, 8-cooling device, 9-surface passivation and oiling station, 10-limit portion anti-oxidation spraying device, 11-coiling machine, 12-alkalescent nertralizer spray equipment.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing and specific embodiment:
FeO eutectoid reaction schematic diagram shown in Figure 1 and control coiling temperature shown in Figure 2 and cooling rate obtain the schematic diagram of different scale structures and in background technology, have done introduction, repeat no more in this.
Hot rolling strip steel scale control and modification unit as shown in Figure 3; Comprise the uncoiling mechanism, winding-up drying device 3a, straightening device 4, heater 7, cooling device 8, redrying device 3b, surface passivation and oiling station 9, coiling clamp roller 2b and the coiling machine 11 that connect successively through roller-way; Wherein, Be provided with blow device 5 between said straightening device 4 and the heater 7, coiling machine 11 is provided with limit portion anti-oxidation spraying device 10 and alkalescent nertralizer spray equipment 12.
In the technique scheme, straightening device 4 is used for the band steel that has just rolled off the production line is carried out scale breading, smooth processing.Above-mentioned blow device 5 is used for broken iron scale on the band steel, and foreign material clean processing.Above-mentioned redrying device 3b is used for the cooled cooling medium that remains in belt steel surface of band steel is carried out dried.Above-mentioned surface passivation and oiling station 9 can freely be selected surface passivation as required or be coated with functional oil, and passivation adopts spraying passivating solution method, antirust oil then to adopt roll-type oiling mode, and the antirust oil that is adopted need possess anti-400 ~ 550 ℃ of high-temperature behaviors.Above-mentioned limit portion anti-oxidation spraying device 10 when strip coiling at the anti-oxidation glass dust of its end face spraying one deck, thereby glass dust at high temperature can melt slit between the coil of strip end face strip edge portion is sealed, and finally reduces the oxidation of limit portion.Above-mentioned alkalescent nertralizer spray equipment 12 is at band steel coil of strip outermost surface spraying one deck alkalescent nertralizer such as Na
2CO
3Deng to reduce the interfacial reaction between the belt steel surface and bunch wrap material under the wet environment.
In the technique scheme, the import of heater 7 and exit position are equipped with temperature measurer 6, and the exit position of cooling device also is provided with temperature measurer 6.
In the technique scheme, heater 7 is heat radiation heater or induction heating apparatus.This heater need have gas tightness and heating process at N
2Carry out under the protective atmosphere, the rate of heat addition is 5 ~ 30 ℃/s.
In the technique scheme, cooling device 8 is equipment water jetting cooler or water-air atomizing cooling device.This cooling device 8 is specially cooling manifold and the nozzle that some distributes up and down, and cooldown rate can be 50 ~ 100 ℃/s, and passes through the adjusting of the switching realization cooling rate of cooling manifold, along the cooling of strip width direction evenly.
In the technique scheme, uncoiling mechanism comprises the uncoiler 1 and uncoiling pinch roll 2a that connects successively through roller-way.
Hot rolling strip steel scale control of the present invention and modification unit can be produced based on demand and be prone to pickling SPHC steel or exempt from pickling 510L steel, and explanation utilizes the present invention to produce the method for above-mentioned two kinds of steel respectively below:
Utilize this hot rolling strip steel scale control and the production of modification unit to be prone to pickling SPHC steel; Its key step is following: the SPHC coil of strip that has just rolled off the production line; About 600 ℃ of temperature, uncoiler 1 utilizes straightening device 4 with its uncoiling in the use uncoiling mechanism; Use bigger tension force and bending force with its scale breading, use blowing device 5 to purge iron scale then; Use 6 pairs of bands of temperature measurer steel to carry out thermometric; To reach the required cooling rate instruction of target temperature through feedback device and be passed to cooling device 8; Collector through some in the open cold radiator cooler 8 makes cooling device will be with steel to be cooled to about 200 ℃ with the speed of 80 ℃/s; Through redrying device 3b the cooled cooling medium that remains in belt steel surface of band steel is carried out dried again; Then by coiling machine 11 with strip coiling, so far, be prone to the production of pickling SPHC steel and accomplish; Heater 7, surface passivation and oiling station 9, limit portion anti-oxidation spraying device 10 and alkalescent nertralizer spray equipment 12 are closed condition in the production process of easy pickling SPHC steel, and the band steel directly passes said apparatus.Scale structure FeO content can reach more than 50% in the above-mentioned easy pickling SPHC steel, and iron scale thickness can be controlled in the 10 μ m, and even along strip width direction scale structure and performance.
Utilize this hot rolling strip steel scale control and the production of modification unit to exempt from pickling 510L steel; Its key step is following: the 510L coil of strip that rolls off the production line; About 500 ℃ of temperature, uncoiler 1 utilizes straightening device 4 with its uncoiling in the use uncoiling mechanism; Use less tension force and bending force that it is smooth, use blowing device 5 to purge the surface porosity iron scale; Use 6 pairs of bands of temperature measurer steel to carry out thermometric; To reach the required heating instruction of target temperature through feedback device and be passed to heater 7; Utilize induction heating apparatus will be with steel to be heated to about 540 ℃ with the speed of 10 ℃/s; Temperature drop during in order to the compensation uncoiling and increase band steel are walked the time the eutectoid reaction district, obtain more eutectoid structure; Use surface passivation and oiling station 9 that belt steel surface is smeared one deck thermostable rustproof oil then; After this; By coiling machine 11 with strip coiling; When batching, use limit portion anti-oxidation spraying device 10 at the anti-oxidation glass dust of band steel coil of strip end face spraying one deck, use the outmost turns surface spraying alkalescent nertralizer Na of alkalescent nertralizer spray equipment 12 at coil of strip
2CO
3, so far, exempt from the production of pickling 510L steel and accomplish, exempt from that cooling device 8 is a closed condition with redrying device 3b in the pickling 510L steel production process, the band steel directly passes said apparatus.The above-mentioned Fe that exempts from scale structure in the pickling 510L steel
3O
4Content can reach more than 80%, and thickness of scale can be controlled in the 10 μ m, and even along strip width direction scale structure and performance.
Claims (5)
1. a hot rolling strip steel scale is controlled and the modification unit; It is characterized in that: it comprises uncoiling mechanism, winding-up drying device (3a), straightening device (4), heater (7), cooling device (8), redrying device (3b), surface passivation and oiling station (9), coiling clamp roller (2b) and the coiling machine (11) that connects successively through roller-way; Wherein, Be provided with blow device (5) between said straightening device (4) and the heater (7), said coiling machine (11) is provided with limit portion anti-oxidation spraying device (10) and alkalescent nertralizer spray equipment (12).
2. hot rolling strip steel scale control according to claim 1 and modification unit; It is characterized in that: the import of said heater (7) and exit position are equipped with temperature measurer (6), and the exit position of said cooling device (8) also is provided with temperature measurer (6).
3. hot rolling strip steel scale control according to claim 1 and 2 and modification unit, it is characterized in that: said heater (7) is heat radiation heater or induction heating apparatus.
4. hot rolling strip steel scale control according to claim 1 and 2 and modification unit, it is characterized in that: said cooling device (8) is equipment water jetting cooler or water-air atomizing cooling device.
5. hot rolling strip steel scale control according to claim 1 and 2 and modification unit, it is characterized in that: said uncoiling mechanism comprises uncoiler (1) and the uncoiling pinch roll (2a) that connects successively through roller-way.
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|---|---|---|---|
| CN201210137306.2A CN102658301B (en) | 2012-05-04 | 2012-05-04 | Control and modifying unit of scale of hot rolling strip steel |
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Cited By (7)
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| CN103920737A (en) * | 2014-03-27 | 2014-07-16 | 中冶南方工程技术有限公司 | Method for eliminating oxide on surface of band steel of carbon steel |
| CN104005017A (en) * | 2014-05-23 | 2014-08-27 | 安徽永杰铜业有限公司 | Copper strip surface passivation device |
| CN104451496A (en) * | 2014-12-31 | 2015-03-25 | 夏征 | Steel coating device and production method thereof |
| US10370735B2 (en) * | 2014-10-08 | 2019-08-06 | Nippon Steel Corporation | Heat treated steel product having high strength and excellent chemical conversion coating ability and method of production of same |
| CN110961466A (en) * | 2019-12-19 | 2020-04-07 | 北京首钢股份有限公司 | Production method of interstitial-free steel |
| CN111015108A (en) * | 2019-12-19 | 2020-04-17 | 北京首钢股份有限公司 | Method for controlling surface defects of pickled plate |
| CN117244950A (en) * | 2023-09-15 | 2023-12-19 | 山东盛阳金属科技股份有限公司 | A process to overcome the soft and hard edges of ferritic stainless steel hot rolling |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103920737A (en) * | 2014-03-27 | 2014-07-16 | 中冶南方工程技术有限公司 | Method for eliminating oxide on surface of band steel of carbon steel |
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| US10370735B2 (en) * | 2014-10-08 | 2019-08-06 | Nippon Steel Corporation | Heat treated steel product having high strength and excellent chemical conversion coating ability and method of production of same |
| CN104451496A (en) * | 2014-12-31 | 2015-03-25 | 夏征 | Steel coating device and production method thereof |
| CN110961466A (en) * | 2019-12-19 | 2020-04-07 | 北京首钢股份有限公司 | Production method of interstitial-free steel |
| CN111015108A (en) * | 2019-12-19 | 2020-04-17 | 北京首钢股份有限公司 | Method for controlling surface defects of pickled plate |
| CN117244950A (en) * | 2023-09-15 | 2023-12-19 | 山东盛阳金属科技股份有限公司 | A process to overcome the soft and hard edges of ferritic stainless steel hot rolling |
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|---|---|
| CN102658301B (en) | 2014-11-12 |
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