CN111020174A - Method for reducing roll marks generated on surface of steel plate in quenching furnace - Google Patents
Method for reducing roll marks generated on surface of steel plate in quenching furnace Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 213
- 239000010959 steel Substances 0.000 title claims abstract description 213
- 238000010791 quenching Methods 0.000 title claims abstract description 97
- 230000000171 quenching effect Effects 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 74
- 238000010438 heat treatment Methods 0.000 claims abstract description 43
- 230000033764 rhythmic process Effects 0.000 claims abstract description 30
- 238000004321 preservation Methods 0.000 claims description 40
- 230000000694 effects Effects 0.000 abstract description 6
- 230000033001 locomotion Effects 0.000 abstract description 4
- 238000012546 transfer Methods 0.000 abstract description 2
- 239000002436 steel type Substances 0.000 description 9
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- 230000002035 prolonged effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000010079 rubber tapping Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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Abstract
The invention discloses a method for reducing roll marks generated on the surface of a steel plate in a quenching furnace, which comprises the working procedures of temperature field control in the furnace, swing speed control in the steel plate furnace, furnace pressure control and steel loading and pitch control. The invention adopts a heating mode combining temperature gradient steel burning and temperature difference of the upper part and the lower part in the quenching furnace, so that the temperature of the steel plate in a preheating zone and a heating zone is lower, and meanwhile, the temperature of the lower surface of the steel plate is lower than that of the upper surface, thereby effectively reducing the roller marks generated on the surface of the steel plate; the swing speed of the steel plate in the furnace is adjusted to be 1.0-1.2 m/min, so that the movement inertia of the steel plate is reduced, the roll mark expansion is reduced, and a good effect is achieved; the micro-positive pressure at the upper part of the furnace body and the micro-negative pressure at the lower part are adopted for steel burning, so that the heat transfer direction is changed; the heating quality is improved by controlling the steel loading rhythm of the steel plate. The method controls the roll mark grinding area of the steel plate produced by the quenching furnace to be less than or equal to 10 percent, ensures that the surface quality of the high value-added quenched steel plate meets the requirement, and has remarkable economic benefit.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for reducing roll marks on the surface of a steel plate in a quenching furnace.
Background
With the increasingly intense market competition of the steel plate, users put forward higher requirements on the appearance quality of the steel plate, such as the requirements that the steel plate is not allowed to be welded and repaired, and the surface grinding area does not exceed 10%. In the process of producing steel plates by using a quenching furnace, the quenching furnace belongs to a roller hearth furnace, and the production of the quenching furnace of the roller hearth furnace is always troubled by the problem of roller marks on the surfaces of the steel plates. The main reason for generating the roll mark is that after the roller of the roller hearth furnace is aged, the roller has the defects of bulges, pits, slag nodules and the like, the steel plate is softened in the heat preservation section, and the protruding slag nodules push out a pit on the lower surface of the steel and even attach to the steel plate, so the roll mark is generated.
The method for controlling the roller hearth furnace to generate the roller mark at present comprises the steps of performing shot blasting on a steel plate entering the furnace, forming a groove at a steel ingot riser entering the furnace, reducing the damage of the steel plate entering the furnace to a furnace hearth roller, performing measures such as passing through the furnace at irregular intervals, adjusting a temperature field and the like, but the effect is not obvious, the roller mark problem is not obviously improved, and in addition, the production cost is increased while the yield is low due to frequent passing through the furnace.
Due to the fact that a large amount of steel plates are overstocked in a grinding process due to the roll mark problem, particularly the grinding area of a thick plate exceeds 15%, the labor intensity of a grinder is increased, the production period is greatly prolonged, and meanwhile local negative errors are easily caused after manual grinding. Therefore, the rolling mark problem on the surface of the steel plate seriously affects the production progress and has a great negative effect on the successful delivery date.
Disclosure of Invention
The invention aims to provide a method for reducing roll marks on the surface of a steel plate in a quenching furnace. The method can obviously reduce the roll mark on the surface of the steel plate in the quenching furnace, improve the surface quality of the steel plate, and control the grinding area of the roll mark of the steel plate in the quenching furnace within 10 percent so as to ensure that the surface quality of the high value-added quenching steel plate meets the requirement.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for reducing roll marks generated on the surface of a steel plate in a quenching furnace comprises the working procedures of temperature field control in the furnace, swing speed control in the steel plate furnace, furnace pressure control and steel loading and rhythm control, and the specific process steps are as follows:
(1) controlling a temperature field in the furnace: the temperature area in the furnace is sequentially divided into a preheating area, a heating area and a heat preservation area, the temperature in the furnace changes in a temperature gradient manner, the temperature of the preheating area and the temperature of the heating area in the furnace gradually increase from low to high in an arithmetic progression manner, the maximum temperature is lower than the quenching temperature, the temperature of the heat preservation area is the quenching temperature, and the temperature of the heat preservation area is 910-930 ℃;
(2) controlling the swing speed in the steel plate furnace: controlling the swing speed in the steel plate furnace to be 1.0-1.2 m/min;
(3) controlling the furnace pressure: in the furnace pressure control, the upper part adopts micro-positive pressure control, the pressure is controlled to be 10-15 Pa, the lower part adopts micro-negative pressure control, and the pressure is controlled to be-5-0 Pa;
(4) steel loading and rhythm control: and adjusting the loading rhythm of the steel plates, wherein the distance between the two steel plates loaded in front and at the back is more than 2.5m, and the steel plate loaded in the back is loaded when the tail temperature of the steel plate loaded in the front is 750-780 ℃.
The temperature gradients of a preheating zone and a heating zone in the furnace in the step (1) are set to be 5 grades, the temperature gradient of the upper part of a temperature field in the furnace is 700-730 ℃, 750-780 ℃, 800-830 ℃, 850-880 ℃, 900-920 ℃, the temperature of a heat preservation zone is 910-930 ℃, and the temperature of the lower part of the temperature field in the furnace is set to be 10 ℃ lower than that of the upper part.
The quenching time in the step (1) is 8-30 min.
The method controls the grinding area of the roll mark of the steel plate produced by the quenching furnace to be less than or equal to 10 percent, and ensures that the surface quality of the high value-added quenched steel plate meets the requirement.
The design principle of the method for reducing the roll marks generated on the surface of the steel plate in the quenching furnace is as follows:
firstly, a new furnace temperature field is set, the furnace temperature area is divided into a preheating area, a heating area and a heat preservation area in sequence, the temperature in the furnace changes in a temperature gradient manner, the temperatures of the preheating area and the heating area in the furnace gradually increase in an arithmetic progression from low to high, the maximum temperature is lower than the quenching temperature, and the temperature in the heat preservation area is the quenching temperature. The temperature gradients of the preheating zone and the heating zone in the furnace are set to be 5 grades, the temperature values of the upper parts of the temperature fields in the furnace are respectively 700-730 ℃, 750-780 ℃, 800-830 ℃, 850-880 ℃, 900-920 ℃, the temperature of the heat preservation zone is 910-930 ℃, and the temperature of the lower part of the temperature field in the furnace is set to be 10 ℃ lower than that of the upper part.
Then, the swing speed in the steel plate furnace is adjusted to 1.0 to 1.2 m/min.
Because the steel plate has heavy weight and large inertia in the motion process, if the steel plate swings at high speed in the furnace for a long time, the roll mark is easy to enlarge in the swinging process. The diameter of the hearth roll is 580mm, the swing period is 120s according to the design of the quenching furnace, the swing speed is 3m/min, the steel plate runs for 6m in the swing period, the circumference of the hearth roll rotating is approximately equal to 1.82m, and the hearth roll needs to rotate for more than 3 circles in the original swing period. After a series of tests, the swing speed is adjusted to 1.0-1.2 m/min, a certain effect is obtained, the movement inertia of the steel plate is reduced, the roll mark is enlarged, and the local bending phenomenon is reduced by rotating the hearth roll for one circle.
Thirdly, in the furnace pressure control, the upper part adopts micro positive pressure control, the pressure is controlled to be 10-15 Pa, the lower part adopts micro negative pressure control, and the pressure is controlled to be-5-0 Pa.
Fourthly, adjusting the loading rhythm of the steel plates, wherein the distance between two steel plates loaded in front and at the back is more than 2.5m, and the steel plate loaded in the back is loaded when the tail temperature of the steel plate loaded in the front reaches 750-780 ℃.
The steel plate steel loading rhythm is reasonably controlled, and roll marks are effectively reduced. The quenching furnace is limited by the short furnace body, the head-tail temperature difference of the steel plate is easy to appear in the heating process, namely the head meets the tapping condition, and the tail does not enter the heat preservation state, so that the time of the steel plate in the furnace is prolonged, and if the second steel plate enters the furnace after a steel piece is normally loaded, a large amount of cold steel absorbs heat, so that the first tail is more difficult to enter the heat preservation state. Aiming at the situation, the second steel plate is limited to enter the furnace, the safety distance between the two steel plates is adjusted to be 2.5m, and the second steel plate is installed when the tail temperature of the first steel plate reaches more than 750 ℃, so that the time of the steel plates in the furnace can be effectively shortened, and the roll marks are reduced.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the invention adopts a heating mode of combining temperature gradient steel burning and temperature difference of the upper part and the lower part in the quenching furnace, so that the temperature of the steel plate in a preheating zone and a heating zone is lower, and the temperature of the lower surface of the steel plate is lower than that of the upper surface, thereby effectively reducing the roll marks generated on the surface of the steel plate. 2. The invention adjusts the swing speed of the steel plate in the furnace to be 1.0-1.2 m/min, reduces the movement inertia of the steel plate, reduces the expansion of roll marks and obtains good effect. 3. The invention adopts the micro-positive pressure at the upper part of the furnace body and the micro-negative pressure at the lower part to burn steel, so as to change the heat transfer direction; the heating quality is improved by controlling the steel loading rhythm of the steel plate. 4. The method controls the roll mark grinding area of the steel plate produced by the quenching furnace to be less than or equal to 10 percent, ensures that the surface quality of the high value-added quenched steel plate meets the requirement, and has remarkable economic benefit. 5. The furnace passing period of the invention is prolonged from one time of 3 furnace passes of the original process to one time of 6-9 furnace passes, thereby effectively improving the production efficiency, reducing the cost of replacing spare parts of the hearth roll and reducing the production cost.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The steel type smelted in the embodiment is 12Cr2Mo1R, the specification is 61.5mm 2850mm 6340mm, and the method for reducing the roll marks generated on the surface of the steel plate in the quenching furnace comprises the working procedures of furnace temperature field control, steel plate furnace swinging speed control, furnace pressure control and steel loading and node control, and the specific process steps are as follows:
(1) controlling a temperature field in the furnace: the temperature area in the furnace is divided into a preheating area, a heating area and a heat preservation area in sequence, the temperature in the furnace changes in a temperature gradient manner, the temperature of the preheating area and the temperature of the heating area in the furnace gradually increases in an arithmetic progression from low to high, the maximum temperature is lower than the quenching temperature, the temperature of the heat preservation area is the quenching temperature, the quenching temperature is 930 ℃, and the quenching time is 8 min; the temperature gradients of a preheating zone and a heating zone in the furnace are set to be 5 grades, the temperature of the lower part of a temperature field in the furnace is set to be 10 ℃ lower than that of the upper part, the temperature of a 10-12 zone after heat preservation is set to be 930 ℃, and the temperature values of the upper part of the temperature field in the furnace are respectively as follows: 730 ℃ in the 1 st zone, 780 ℃ in the 2 nd zone, 830 ℃ in the 3 rd zone, 880 ℃ in the 4 th zone, 920 ℃ in the 5 th to 9 th zones and 930 ℃ in the 10 th to 12 th zones, wherein the temperature values under the temperature field in the furnace are respectively as follows: 720 ℃ in the 1 st zone, 770 ℃ in the 2 nd zone, 820 ℃ in the 3 rd zone, 870 ℃ in the 4 th zone, 910 ℃ in the 5 th to 9 th zones, and 920 ℃ in the 10 th to 12 th zones;
(2) controlling the swing speed in the steel plate furnace: controlling the swing speed in the steel plate furnace to be 1.0 m/min;
(3) controlling the furnace pressure: in the furnace pressure control, the upper part adopts micro-positive pressure control, the pressure is controlled at 13Pa, the lower part adopts micro-negative pressure control, and the pressure is controlled at-2 Pa;
(4) steel loading and rhythm control: adjusting the loading rhythm of the steel plates, wherein the distance between two steel plates loaded in front and at the back is 2.8m, and the steel plate loaded in the back when the tail temperature of the steel plate loaded in the front is 780 ℃.
According to the method for reducing the roll marks on the surface of the steel plate in the quenching furnace, the grinding area of the roll marks of the steel plate produced by the quenching furnace is controlled to be 3%, the roll marks are fewer, only the head part has a slight roll mark, the surface quality is good after manual grinding, and the method meets the surface quality requirement of the high-value-added quenched steel plate.
Example 2
The smelting steel type of the embodiment is Q690D, the specification is 80mm 2600mm 14100mm, and the method for reducing the roll marks generated on the surface of the steel plate in the quenching furnace comprises the working procedures of furnace temperature field control, steel plate furnace inner swing speed control, furnace pressure control and steel loading and rhythm control, and the specific process steps are as follows:
(1) controlling a temperature field in the furnace: the temperature area in the furnace is divided into a preheating area, a heating area and a heat preservation area in sequence, the temperature in the furnace changes in a temperature gradient manner, the temperatures of the preheating area and the heating area in the furnace are in an arithmetic progression from low to high, the maximum temperature is lower than the quenching temperature, the temperature in the heat preservation area is the quenching temperature, the quenching temperature is 910 ℃, and the quenching time is 15 min; the temperature gradients of a preheating zone and a heating zone in the furnace are set to be 5 grades, the temperature of the lower part of a temperature field in the furnace is set to be 10 ℃ lower than that of the upper part, the temperature of a 10-12 zone after heat preservation is set to be 910 ℃, and the temperature values of the upper part of the temperature field in the furnace are respectively as follows: 700 ℃ in the 1 st zone, 750 ℃ in the 2 nd zone, 800 ℃ in the 3 rd zone, 850 ℃ in the 4 th zone, 900 ℃ in the 5 th to 9 th zones and 910 ℃ in the 10 th to 12 th zones, and the temperature values under the temperature field in the furnace are respectively as follows: 690 ℃ in the 1 st zone, 740 ℃ in the 2 nd zone, 790 ℃ in the 3 rd zone, 840 ℃ in the 4 th zone, 890 ℃ in the 5 th to 9 th zones and 900 ℃ in the 10 th to 12 th zones;
(2) controlling the swing speed in the steel plate furnace: controlling the swing speed in the steel plate furnace to be 1.0 m/min;
(3) controlling the furnace pressure: in the furnace pressure control, the upper part adopts micro-positive pressure control and the pressure is controlled at 11Pa, and the lower part adopts micro-negative pressure control and the pressure is controlled at-1 Pa;
(4) steel loading and rhythm control: adjusting the loading rhythm of the steel plates, wherein the distance between two steel plates loaded in front and at the back is 2.6m, and the steel plate loaded in the back is loaded when the tail temperature of the steel plate loaded in the front is 750 ℃.
According to the method for reducing the roll marks on the surface of the steel plate in the quenching furnace, the roll marks are not found on the steel plate produced by the quenching furnace, the surface quality is good, and the method meets the surface quality requirement of the high value-added quenched steel plate.
Example 3
The steel type smelted in the embodiment is 12Cr2Mo1R, the specification is 81.5mm 3930mm 8200mm, and the method for reducing the roll marks generated on the surface of the steel plate in the quenching furnace comprises the working procedures of furnace temperature field control, steel plate furnace swinging speed control, furnace pressure control and steel loading and node control, and the specific process steps are as follows:
(1) controlling a temperature field in the furnace: the temperature area in the furnace is divided into a preheating area, a heating area and a heat preservation area in sequence, the temperature in the furnace changes in a temperature gradient manner, the temperature of the preheating area and the temperature of the heating area in the furnace gradually increases in an arithmetic progression from low to high, the maximum temperature is lower than the quenching temperature, the temperature of the heat preservation area is the quenching temperature, the quenching temperature is 930 ℃, and the quenching time is 18 min; the temperature gradients of a preheating zone and a heating zone in the furnace are set to be 5 grades, the temperature of the lower part of a temperature field in the furnace is set to be 10 ℃ lower than that of the upper part, the temperature of a 10-12 zone after heat preservation is set to be 930 ℃, and the temperature values of the upper part of the temperature field in the furnace are respectively as follows: 730 ℃ in the 1 st zone, 780 ℃ in the 2 nd zone, 830 ℃ in the 3 rd zone, 880 ℃ in the 4 th zone, 920 ℃ in the 5 th to 9 th zones and 930 ℃ in the 10 th to 12 th zones, wherein the temperature values under the temperature field in the furnace are respectively as follows: 720 ℃ in the 1 st zone, 770 ℃ in the 2 nd zone, 820 ℃ in the 3 rd zone, 870 ℃ in the 4 th zone, 910 ℃ in the 5 th to 9 th zones, and 920 ℃ in the 10 th to 12 th zones;
(2) controlling the swing speed in the steel plate furnace: controlling the swing speed in the steel plate furnace to be 1.0 m/min;
(3) controlling the furnace pressure: in the furnace pressure control, the upper part adopts micro-positive pressure control and the pressure is controlled to be 12Pa, the lower part adopts micro-negative pressure control, and the pressure is controlled to be-4 Pa;
(4) steel loading and rhythm control: adjusting the loading rhythm of the steel plates, wherein the distance between two steel plates loaded in front and at the back is 2.7m, and the steel plate loaded in the back when the tail temperature of the steel plate loaded in the front is 780 ℃.
According to the method for reducing the roll marks on the surface of the steel plate in the quenching furnace, the roll marks are not found on the steel plate produced by the quenching furnace, the surface quality is good, and the method meets the surface quality requirement of the high value-added quenched steel plate.
Example 4
The smelting steel type of the embodiment is WQ690D, the specification is 86mm 2563mm 11319mm, and the method for reducing the roll marks generated on the surface of the steel plate in the quenching furnace comprises the working procedures of furnace temperature field control, steel plate furnace inner swing speed control, furnace pressure control and steel loading and rhythm control, and the specific process steps are as follows:
(1) controlling a temperature field in the furnace: the temperature area in the furnace is divided into a preheating area, a heating area and a heat preservation area in sequence, the temperature in the furnace changes in a temperature gradient manner, the temperatures of the preheating area and the heating area in the furnace are in an arithmetic progression from low to high, the maximum temperature is lower than the quenching temperature, the temperature in the heat preservation area is the quenching temperature, the quenching temperature is 910 ℃, and the quenching time is 18 min; the temperature gradients of a preheating zone and a heating zone in the furnace are set to be 5 grades, the temperature of the lower part of a temperature field in the furnace is set to be 10 ℃ lower than that of the upper part, the temperature of a 10-12 zone after heat preservation is set to be 910 ℃, and the temperature values of the upper part of the temperature field in the furnace are respectively as follows: 700 ℃ in the 1 st zone, 750 ℃ in the 2 nd zone, 800 ℃ in the 3 rd zone, 850 ℃ in the 4 th zone, 900 ℃ in the 5 th to 9 th zones and 910 ℃ in the 10 th to 12 th zones, and the temperature values under the temperature field in the furnace are respectively as follows: 690 ℃ in the 1 st zone, 740 ℃ in the 2 nd zone, 790 ℃ in the 3 rd zone, 840 ℃ in the 4 th zone, 890 ℃ in the 5 th to 9 th zones and 900 ℃ in the 10 th to 12 th zones;
(2) controlling the swing speed in the steel plate furnace: controlling the swing speed in the steel plate furnace to be 1.0 m/min;
(3) controlling the furnace pressure: in the furnace pressure control, the upper part adopts micro-positive pressure control and the pressure is controlled at 13Pa, the lower part adopts micro-negative pressure control, and the pressure is controlled at-3 Pa;
(4) steel loading and rhythm control: adjusting the loading rhythm of the steel plates, wherein the distance between two steel plates loaded in front and at the back is 2.65m, and the steel plate loaded in the back is loaded when the tail temperature of the steel plate loaded in the front is 750 ℃.
According to the method for reducing the roll marks on the surface of the steel plate in the quenching furnace, the roll marks are not found on the steel plate produced by the quenching furnace, the surface quality is good, and the method meets the surface quality requirement of the high value-added quenched steel plate.
Example 5
The smelting steel type of the embodiment is 15CrMoR (H), the specification is 103mm 3140mm 10920mm, and the method for reducing the roll marks generated on the surface of the steel plate in the quenching furnace comprises the working procedures of furnace temperature field control, steel plate furnace swinging speed control, furnace pressure control and steel loading and joint control, and the specific process steps are as follows:
(1) controlling a temperature field in the furnace: the temperature area in the furnace is divided into a preheating area, a heating area and a heat preservation area in sequence, the temperature in the furnace changes in a temperature gradient manner, the temperature of the preheating area and the temperature of the heating area in the furnace gradually increases in an arithmetic progression from low to high, the maximum temperature is lower than the quenching temperature, the temperature of the heat preservation area is the quenching temperature, the quenching temperature is 920 ℃, and the quenching time is 25 min; the temperature gradients of a preheating zone and a heating zone in the furnace are set to be 5 grades, the temperature of the lower part of a temperature field in the furnace is set to be 10 ℃ lower than that of the upper part, the temperature of a 10-12 zone after heat preservation is set to be 920 ℃, and the temperature values of the upper part of the temperature field in the furnace are respectively as follows: 710 ℃ in the 1 st zone, 760 ℃ in the 2 nd zone, 810 ℃ in the 3 rd zone, 860 ℃ in the 4 th zone, 910 ℃ in the 5 th to 9 th zones and 920 ℃ in the 10 th to 12 th zones, and the temperature values under the temperature field in the furnace are respectively: 700 ℃ in the 1 st zone, 750 ℃ in the 2 nd zone, 800 ℃ in the 3 rd zone, 850 ℃ in the 4 th zone, 900 ℃ in the 5 th to 9 th zones and 910 ℃ in the 10 th to 12 th zones;
(2) controlling the swing speed in the steel plate furnace: controlling the swing speed in the steel plate furnace to be 1.1 m/min;
(3) controlling the furnace pressure: in the furnace pressure control, the upper part adopts micro-positive pressure control and the pressure is controlled to be 11Pa, the lower part adopts micro-negative pressure control, and the pressure is controlled to be-2 Pa;
(4) steel loading and rhythm control: adjusting the steel plate loading rhythm, wherein the distance between two steel plates loaded in front and at the back is 2.55m, and the steel plate loaded in the back is loaded when the tail temperature of the steel plate loaded in the front is 760 ℃.
According to the method for reducing the roll marks on the surface of the steel plate in the quenching furnace, the roll marks are not found on the steel plate produced by the quenching furnace, the surface quality is good, and the method meets the surface quality requirement of the high value-added quenched steel plate.
Example 6
The smelting steel type of the embodiment is 13MnNiMoR, the specification is 90mm 1850mm 13530mm, and the method for reducing the roll marks generated on the surface of the steel plate in the quenching furnace comprises the working procedures of temperature field control in the furnace, swinging speed control in the steel plate furnace, furnace pressure control and steel loading and pitch control, and the specific process steps are as follows:
(1) controlling a temperature field in the furnace: the temperature area in the furnace is divided into a preheating area, a heating area and a heat preservation area in sequence, the temperature in the furnace changes in a temperature gradient manner, the temperature of the preheating area and the temperature of the heating area in the furnace gradually increases in an arithmetic progression from low to high, the maximum temperature is lower than the quenching temperature, the temperature of the heat preservation area is the quenching temperature, the quenching temperature is 915 ℃, and the quenching time is 18 min; the temperature gradients of a preheating zone and a heating zone in the furnace are set to be 5 grades, the temperature of the lower part of a temperature field in the furnace is set to be 10 ℃ lower than that of the upper part, the temperature of a 10-12 zone after heat preservation is set to be 915 ℃, and the temperature values of the upper part of the temperature field in the furnace are respectively as follows: 705 ℃ of the 1 st zone, 755 ℃ of the 2 nd zone, 805 ℃ of the 3 rd zone, 855 ℃ of the 4 th zone, 905 ℃ of the 5 th to 9 th zone and 915 ℃ of the 10 th to 12 th zone, wherein the temperature values of the lower part of the temperature field in the furnace are respectively as follows: the temperature of the 1 st zone is 695 ℃, the 2 nd zone is 745 ℃, the 3 rd zone is 795 ℃, the 4 th zone is 845 ℃, the 5 th to 9 th zones are 895 ℃ and the 10 th to 12 th zones are 905 ℃;
(2) controlling the swing speed in the steel plate furnace: controlling the swing speed in the steel plate furnace to be 1.15 m/min;
(3) controlling the furnace pressure: in the furnace pressure control, the upper part adopts micro-positive pressure control and the pressure is controlled to be 12Pa, the lower part adopts micro-negative pressure control, and the pressure is controlled to be-4 Pa;
(4) steel loading and rhythm control: the steel plate loading rhythm is adjusted, the distance between two steel plates loaded in front and at the back is 2.75m, and the steel plate loaded in the back is loaded when the tail temperature of the steel plate loaded in the front is 770 ℃.
According to the method for reducing the roll marks on the surface of the steel plate in the quenching furnace, the grinding area of the roll marks of the steel plate produced by the quenching furnace is controlled to be 7%, the roll marks are fewer, only the head part has a slight roll mark, the surface quality is good after manual grinding, and the method meets the surface quality requirement of the high-value-added quenched steel plate.
Example 7
The smelting steel type of the embodiment is 07MnNiMoVDR (L), the specification is 49mm 3310mm 11430mm, and the method for reducing the roll marks generated on the surface of the steel plate in the quenching furnace comprises the working procedures of furnace temperature field control, steel plate furnace swinging speed control, furnace pressure control and steel loading and pitch control, and the specific process steps are as follows:
(1) controlling a temperature field in the furnace: the temperature area in the furnace is divided into a preheating area, a heating area and a heat preservation area in sequence, the temperature in the furnace changes in a temperature gradient manner, the temperature of the preheating area and the temperature of the heating area in the furnace gradually increases in an arithmetic progression from low to high, the maximum temperature is lower than the quenching temperature, the temperature of the heat preservation area is the quenching temperature, the quenching temperature is 925 ℃, and the quenching time is 8 min; the temperature gradients of a preheating zone and a heating zone in the furnace are set to be 5 grades, the temperature of the lower part of a temperature field in the furnace is set to be 10 ℃ lower than that of the upper part, the temperature of a 10-12 zone after heat preservation is set to be 925 ℃, and the temperature values of the upper part of the temperature field in the furnace are respectively as follows: the temperature values of the 1 st zone 725 ℃, the 2 nd zone 775 ℃, the 3 rd zone 825 ℃, the 4 th zone 875 ℃, the 5 th to 9 th zones 915 ℃ and the 10 th to 12 th zones 925 ℃ are respectively as follows: zone 1 at 715 deg.C, zone 2 at 765 deg.C, zone 3 at 815 deg.C, zone 4 at 865 deg.C, zone 5-9 at 905 deg.C, and zone 10-12 at 915 deg.C;
(2) controlling the swing speed in the steel plate furnace: controlling the swing speed in the steel plate furnace to be 1.15 m/min;
(3) controlling the furnace pressure: in the furnace pressure control, the upper part adopts micro-positive pressure control and the pressure is controlled at 13Pa, the lower part adopts micro-negative pressure control, and the pressure is controlled at-3 Pa;
(4) steel loading and rhythm control: the steel plate loading rhythm is adjusted, the distance between two steel plates loaded in front and at the back is 2.68m, and the steel plate loaded in the back is loaded when the tail temperature of the steel plate loaded in the front is 775 ℃.
According to the method for reducing the roll marks on the surface of the steel plate in the quenching furnace, the roll marks are not found on the steel plate produced by the quenching furnace, the surface quality is good, and the method meets the surface quality requirement of the high value-added quenched steel plate.
Example 8
The smelting steel type of the embodiment is 14Cr1MoR (H), the specification is 137mm 2685mm 13630mm, and the method for reducing the roll marks generated on the surface of the steel plate in the quenching furnace comprises the working procedures of furnace temperature field control, steel plate furnace swinging speed control, furnace pressure control and steel loading and pitch control, and the specific process steps are as follows:
(1) controlling a temperature field in the furnace: the temperature area in the furnace is divided into a preheating area, a heating area and a heat preservation area in sequence, the temperature in the furnace changes in a temperature gradient manner, the temperature of the preheating area and the temperature of the heating area in the furnace gradually increases in an arithmetic progression from low to high, the maximum temperature is lower than the quenching temperature, the temperature of the heat preservation area is the quenching temperature, the quenching temperature is 918 ℃, and the quenching time is 30 min; the temperature gradients of a preheating zone and a heating zone in the furnace are set to be 5 grades, the temperature of the lower part of a temperature field in the furnace is set to be 10 ℃ lower than that of the upper part, the temperature of a 10-12 zone after heat preservation is set to be 918 ℃, and the temperature values of the upper part of the temperature field in the furnace are respectively as follows: 730 ℃ in the 1 st zone, 780 ℃ in the 2 nd zone, 830 ℃ in the 3 rd zone, 880 ℃ in the 4 th zone, 910 ℃ in the 5 th to 9 th zones and 918 ℃ in the 10 th to 12 th zones, wherein the temperature values under the temperature field in the furnace are respectively as follows: 720 ℃ in the 1 st zone, 770 ℃ in the 2 nd zone, 820 ℃ in the 3 rd zone, 870 ℃ in the 4 th zone, 900 ℃ in the 5 th to 9 th zones, and 908 ℃ in the 10 th to 12 th zones;
(2) controlling the swing speed in the steel plate furnace: controlling the swing speed in the steel plate furnace to be 1.2 m/min;
(3) controlling the furnace pressure: in the furnace pressure control, the upper part adopts micro positive pressure control, the pressure is controlled at 15Pa, the lower part adopts micro negative pressure control, and the pressure is controlled at 0 Pa;
(4) steel loading and rhythm control: adjusting the steel plate loading rhythm, wherein the distance between two steel plates loaded in front and at the back is 2.72m, and the steel plate loaded in the back when the tail temperature of the steel plate loaded in the front is 752 ℃.
According to the method for reducing the roll marks on the surface of the steel plate in the quenching furnace, the grinding area of the roll marks of the steel plate produced by the quenching furnace is controlled to be 5%, the roll marks are fewer, only the head part has a slight roll mark, the surface quality is good after manual grinding, and the method meets the surface quality requirement of the high-value-added quenched steel plate.
Example 9
The smelting steel type of the embodiment is WNM400A, the specification is 50mm 2400mm 10600mm, and the method for reducing the roll marks generated on the surface of the steel plate in the quenching furnace comprises the working procedures of furnace temperature field control, steel plate furnace swinging speed control, furnace pressure control and steel loading and rhythm control, and the specific process steps are as follows:
(1) controlling a temperature field in the furnace: the temperature area in the furnace is divided into a preheating area, a heating area and a heat preservation area in sequence, the temperature in the furnace changes in a temperature gradient manner, the temperature of the preheating area and the temperature of the heating area in the furnace gradually increase in an arithmetic progression from low to high, the maximum temperature is lower than the quenching temperature, the temperature of the heat preservation area is the quenching temperature, the quenching temperature is 927 ℃, and the quenching time is 8 min; the temperature gradients of a preheating zone and a heating zone in the furnace are set to be 5 grades, the temperature of the lower part of a temperature field in the furnace is set to be 10 ℃ lower than that of the upper part, the temperature of a 10-12 zone after heat preservation is set to be 927 ℃, and the temperature values of the upper part of the temperature field in the furnace are respectively as follows: 722 ℃ in the 1 st zone, 772 ℃ in the 2 nd zone, 822 ℃ in the 3 rd zone, 872 ℃ in the 4 th zone, 912 ℃ in the 5 th to 9 th zone and 927 ℃ in the 10 th to 12 th zone, and the temperature values under the temperature field in the furnace are respectively: 712 ℃ at region 1, 762 ℃ at region 2, 812 ℃ at region 3, 862 ℃ at region 4, 902 ℃ at regions 5 to 9 and 917 ℃ at regions 10 to 12;
(2) controlling the swing speed in the steel plate furnace: controlling the swing speed in the steel plate furnace to be 1.0 m/min;
(3) controlling the furnace pressure: in the furnace pressure control, the upper part adopts micro-positive pressure control and the pressure is controlled at 10Pa, the lower part adopts micro-negative pressure control, and the pressure is controlled at-5 Pa;
(4) steel loading and rhythm control: adjusting the steel plate loading rhythm, wherein the distance between two steel plates loaded in front and at the back is 2.58m, and the steel plate loaded in the back is loaded when the tail temperature of the steel plate loaded in the front is 763 ℃.
The steel plate performance of the method for reducing the roll marks on the surface of the steel plate in the quenching furnace is as follows:
the method of the invention does not cause adverse effect on the internal performance of the steel plate.
According to the method for reducing the roll marks on the surface of the steel plate in the quenching furnace, the roll marks are not found on the steel plate produced by the quenching furnace, the surface quality is good, and the method meets the surface quality requirement of the high value-added quenched steel plate.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (4)
1. A method for reducing roll marks generated on the surface of a steel plate in a quenching furnace is characterized by comprising the working procedures of temperature field control in the furnace, swing speed control in the steel plate furnace, furnace pressure control and steel loading and pitch control, and the specific process steps are as follows:
(1) controlling a temperature field in the furnace: the temperature area in the furnace is sequentially divided into a preheating area, a heating area and a heat preservation area, the temperature in the furnace changes in a temperature gradient manner, the temperature of the preheating area and the temperature of the heating area in the furnace gradually increase from low to high in an arithmetic progression manner, the maximum temperature is lower than the quenching temperature, the temperature of the heat preservation area is the quenching temperature, and the temperature of the heat preservation area is 910-930 ℃;
(2) controlling the swing speed in the steel plate furnace: controlling the swing speed in the steel plate furnace to be 1.0-1.2 m/min;
(3) controlling the furnace pressure: in the furnace pressure control, the upper part adopts micro-positive pressure control, the pressure is controlled to be 10-15 Pa, the lower part adopts micro-negative pressure control, and the pressure is controlled to be-5-0 Pa;
(4) steel loading and rhythm control: and adjusting the loading rhythm of the steel plates, wherein the distance between the two steel plates loaded in front and at the back is more than 2.5m, and the steel plate loaded in the back is loaded when the tail temperature of the steel plate loaded in the front is 750-780 ℃.
2. The method according to claim 1, wherein the temperature gradients of the preheating zone and the heating zone in the quenching furnace in step (1) are set to 5 grades, the temperature gradient of the upper part of the temperature field in the furnace is 700-730 ℃, 750-780 ℃, 800-830 ℃, 850-880 ℃, 900-920 ℃, the temperature of the holding zone is 910-930 ℃, and the temperature of the lower part of the temperature field in the furnace is set to be 10 ℃ lower than that of the upper part.
3. The method for reducing the roll marks on the surface of the steel plate in the quenching furnace as claimed in claim 1, wherein the quenching time in the step (1) is 8-30 min.
4. The method for reducing the roll marks on the surface of the steel plate in the quenching furnace as claimed in any one of claims 1 to 3, wherein the method controls the roll mark grinding area of the steel plate in the quenching furnace to be less than or equal to 10%.
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| CN114317899A (en) * | 2021-12-16 | 2022-04-12 | 舞阳钢铁有限责任公司 | Method for improving surface quality of large-thickness steel plate produced by roller type quenching furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1253209A2 (en) * | 1998-12-30 | 2002-10-30 | Hille & Müller GmbH | Steel sheet with good forming properties and method for producing the same |
| CN103468919A (en) * | 2013-08-12 | 2013-12-25 | 舞阳钢铁有限责任公司 | Method for reducing roll marks on surface of steel plate in quenching furnace |
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2019
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1253209A2 (en) * | 1998-12-30 | 2002-10-30 | Hille & Müller GmbH | Steel sheet with good forming properties and method for producing the same |
| CN103468919A (en) * | 2013-08-12 | 2013-12-25 | 舞阳钢铁有限责任公司 | Method for reducing roll marks on surface of steel plate in quenching furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114317899A (en) * | 2021-12-16 | 2022-04-12 | 舞阳钢铁有限责任公司 | Method for improving surface quality of large-thickness steel plate produced by roller type quenching furnace |
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