CN117483435A - Leveling method for ferrite-martensite dual-phase ultrahigh-strength hot rolled coil - Google Patents
Leveling method for ferrite-martensite dual-phase ultrahigh-strength hot rolled coil Download PDFInfo
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- CN117483435A CN117483435A CN202311528535.1A CN202311528535A CN117483435A CN 117483435 A CN117483435 A CN 117483435A CN 202311528535 A CN202311528535 A CN 202311528535A CN 117483435 A CN117483435 A CN 117483435A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 229910000734 martensite Inorganic materials 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 53
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 239000000498 cooling water Substances 0.000 claims abstract description 8
- 238000005098 hot rolling Methods 0.000 claims description 17
- 238000005452 bending Methods 0.000 claims description 11
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 239000013072 incoming material Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 7
- 230000006872 improvement Effects 0.000 abstract description 5
- 230000002457 bidirectional effect Effects 0.000 abstract description 3
- 238000011160 research Methods 0.000 abstract description 2
- 238000004804 winding Methods 0.000 abstract 2
- 230000002159 abnormal effect Effects 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
- B21B45/0275—Cleaning devices
- B21B45/0278—Cleaning devices removing liquids
- B21B45/0281—Cleaning devices removing liquids removing coolants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0071—Levelling the rolled product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention mainly aims at the plate shape improvement and surface protection of the hot rolled strip steel leveling process of ferrite-martensite bidirectional high-strength steel to carry out research and analysis, and a set of leveling production method is summarized; 1. the strip shape improving effect of the head-tail tension-free winding section is increased through various process rollers with variable tension, the strip shape consistency in the length direction of the strip steel is ensured, and the strip shape flattening yield is improved; 2. the roller surface adhesion caused by the winding of the working roller surface due to the residual cooling water on the surface of the strip steel is prevented by additionally arranging the inlet water blowing air pipe and limiting the production line operation element, so that the generation of flat roller marks is avoided. After the method is implemented, the open-flat quality of the hot rolled strip steel of the ferrite martensitic bidirectional high-strength steel can be effectively improved from 60% to 90%.
Description
Technical Field
The invention belongs to the technical field of plate shape quality control of hot rolled steel coil leveling production lines, and relates to a leveling method of ferrite martensite dual-phase ultrahigh-strength hot rolled coils.
Background
The light weight and long service life of engineering machinery and commercial vehicles are industry development directions, and raw materials are required to be continuously upgraded in order to meet the trend. The traditional hot continuous rolling mill unit cannot realize on-line production of hot rolled steel plates with tensile strength of more than 800MPa, domestic ultra-high strength steel plates and wear-resistant steel depend on German LOI and east high-precision quenching machines, and a single plate quenching and tempering heat treatment process is adopted to obtain matching of toughness and plate shape, so that the defects of large investment, high cost, long production period and the like exist, and more alloy elements such as Cr, mo and the like are required to be added. The large Dongda first quenching machine arranged on the heat treatment line of Fenfens company has the defects that the quenching plate shape is difficult to meet the general requirements of industry and the products cannot be developed.
The hot rolled coil of ferrite martensitic bidirectional ultrahigh-strength steel is a hot rolled steel plate with tensile strength of more than 800MPa which is newly developed by Tai steel and is influenced by the structure, components and high-strength requirements, the hot rolling production process adopts strong Leng Shiwen coiling, the plate shape state is extremely unstable under the premise of ensuring high strength, particularly, the coiled parts (the length of the head and the tail is about 130 meters respectively) in the head and tail tension-free state, the plate shape state and the coiling part with middle tension have larger difference, the same flattening process parameters are used in the flattening process, the plate shape improving effect is larger, the plate shape improving effect of the head and tail tension-free coiling part is poorer, and the quality requirements of delivered plate shapes cannot be met.
On the other hand, the high-strength steel coiled at the strong cooling room temperature during hot rolling production of the variety can not evaporate due to the fact that the coiling temperature is low and cooling water stays on the surface of strip steel for a long time, so that the problem that the leveling roll mark defect is caused by scale adhesion of a leveling working roll surface is very easy to cause in the leveling production process is solved in the leveling production process.
Aiming at the problems, the invention researches and summarizes a method for controlling flattening process parameters in stages, adopts different uncoiling/coiling tension and running speeds at different positions in the length direction of the strip steel, assists the action of process rollers such as deep bending rollers, crease-resistant rollers, straightening rollers and the like, improves the plate shape improving capability of the head section and the tail section, and ensures the consistency of the quality of the final full-length plate shape; the operation speed of the leveling production line is controlled, the water blowing air pipe at the inlet of the leveling machine set is increased, the water adhesion during the rapid operation process of the leveling working roller is avoided, the generation of leveling roller marks is stopped, and the follow-up plate shape opening and surface qualification rate are improved.
Disclosure of Invention
The invention aims to solve the problems and provides a flattening method of a ferrite-martensite dual-phase ultrahigh-strength hot rolled coil.
The purpose of the invention is realized in the following way: a leveling method of a ferrite martensite dual-phase ultrahigh-strength hot rolled coil comprises the following steps: step one: after the hot rolling production of the ferrite martensite dual-phase ultrahigh-strength steel is finished, arranging the flat production within one week; step two: changing a new working roller before production, and producing from wide to narrow after changing the working roller; step three: setting a minimum roll shifting position allowed by the width according to the width specification; step four: a water blowing air pipe is additionally arranged at the inlet of the leveling line straightener, compressed air with the pressure of 0.5-0.8Mpa is delivered during production, and residual cooling water attached to the surface of strip steel is quickly dried; step five: the unwinding tension of the incoming material plate-shaped stabilizing section is 1.5-2.0 kg/mm; the tension of the coiling machine is set to be 2.5-3.5kg/mm, the tension of the leveling uncoiler is increased to be 2.6-3.2kg/mm in the leveling production process of the end section of the incoming material tensionless coiling head, and the tension of the coiling machine is increased to be 3.5-6.0 kg/mm; step six: initially setting a pressure; step seven: controlling the highest flat line running speed to be 60-100m/min; step eight: a crease-resist roller is put into use, and a deep bending roller is put into use at a part with poor plate shape; step nine: the upper and lower surfaces were inspected twice per roll: checking the length of the upper surface and the lower surface to be 10-15 meters when the vehicle starts; after automatic deceleration, the upper and lower surfaces are inspected for 5-10 meters.
The initial set pressure in the sixth step is specifically: the width is 1600-2000mm, the pressure is 850-1000 tons, the width is 1200-1600mm, and the pressure is 750-900 tons.
The beneficial effects of the invention are as follows: the invention can effectively ensure the flattening effect of the ultra-high strength steel, improve the flattening line shape and the surface quality, improve the subsequent ultra-high strength steel flattening and quality product rate, and gradually implement the invention from 2022 to 3 months of Tai steel hot tandem rolling mill, so that the transverse flattening and quality product rate is greatly improved.
Description of the embodiments
The invention belongs to the technical field of plate shape quality control of hot rolled steel coil leveling production lines: aiming at the instability of the strip steel plate shape state of the high-strength hot-rolled coiled plate, which is coiled in a head-tail tension-free state, the flattening process adopts a head-tail section tension-variable and speed-variable operation method, so that the flattening plate shape improvement effect of the head-tail section is enhanced, and the consistency of the strip steel full-length plate shape quality is ensured. On the other hand, aiming at the problem that the leveling roll mark defect is caused by the bonding of the iron scale which is extremely easy to cause on the surface of the working roll in the leveling production process, the method of increasing the inlet water blowing air pipe of the leveling machine and limiting the leveling speed is adopted, so that the bonding of the iron scale on the surface of the working roll in the leveling production process is avoided, and the surface quality of the strip steel is improved.
The main characteristics of the hot rolled coil of the variety mainly comprise the following aspects: 1. the hot rolling adopts forced cooling low-temperature coiling, the thermal stress of the strip steel is large, and the plate shape state is unstable.
2. The head-tail tension-free coiling part is affected by the shape of the strip, so that the strip steel is cooled more unevenly, and the shape state is worse.
3. Because the surface cooling water cannot be fully evaporated due to room temperature coiling, timely and smooth production must be ensured to dry surface moisture, and the surface attached moisture is easy to pollute a smooth working roller during production, so that the roller surface is adhered, and the roller mark defect is generated.
4. The head and tail of the steel coil are relatively serious head and tail tower shapes under the influence of the shape of the head and tail tension-free section.
5. The strength is high, the limit strength of the flat production capacity is close, and the plate shape improvement requirement is difficult to meet only by virtue of large pressure.
Aiming at the characteristics, the invention adopts the following technical scheme and conception: 1. a water blowing air pipe is additionally arranged at the inlet of the leveling line straightener, compressed air with the pressure of 0.6Mpa is conveyed during production, and part of the cooling water attached to the surface of the strip steel is quickly dried, so that the surface residual water is prevented from being attached to the surface of a working roller in the running process; 2. the running speed of the highest flat line is controlled to be not more than 100m/min, so that water tracks attached to the surface of the working roll are prevented from being gathered under the action of centrifugal force rotating at high speed, and the bonding risk of the roll surface is reduced; 3. in the flattening production process of the rolling line non-tension coiling head and tail sections, the tension of a flattening uncoiler is increased to 3.0kg/mm, the tension of the coiling machine is increased to 5.0kg/mm, the elongation of the flattening line is improved, and the flattening plate shape improvement effect is improved; 4. in the flattening production process of the rolling line non-tension coiling head and tail sections, the running speed of the production line is reduced to below 30m/min, the deep bending roller and the crease-resistant roller are put in, the online tension is increased, and the flattening plate shape improvement effect of the head and tail sections is improved.
The method is only suitable for the production of the flattening process of the hot-rolled ferrite martensite dual-phase ultra-high strength steel strip steel, and mainly aims to improve the original plate shape quality of a coiled plate, avoid the generation of surface defects of the flattening process, mainly aim at the situation that the plate shape state of a head-tail tension-free section of a high-strength variety with the strength level close to the capability of flattening line equipment is poor, ensure the straightness of the plate shape in the final length direction and improve the flattening yield.
The invention is implemented in 2250 flattening unit of Tai steel hot continuous rolling mill from 2022 to 3 months, and the specific implementation steps are as follows: 1. after the hot rolling production of the ferrite martensite dual-phase ultrahigh-strength steel is finished, the ferrite dual-phase ultrahigh-strength steel must be arranged to be produced smoothly within one week, so that the corrosion of the surface of the steel plate caused by long-term residual cooling water on the surface of the strip steel is avoided; 2. the replacement of a new work roll must be ensured before production, and the wide to narrow production must be ensured after the work roll replacement. 3. And setting the minimum roll shifting position allowed by the width according to the width specification. 4. A water blowing air pipe is additionally arranged at the inlet of the leveling line straightener, compressed air with the pressure of 0.5-0.8Mpa is delivered during production, and residual cooling water attached to the surface of strip steel is quickly dried; a plate-shaped stabilizing section, wherein the tension of an uncoiler is 1.5-2.0 kg/mm; the tension of the coiling machine is 2.5-3.5kg/mm, when the shape of the head-tail tension-free section is abnormal, the uncoiling tension is adjusted to 2.6-3.2kg/mm, and the coiling tension can be 3.5-6.0kg/mm until the coiling tension is full. 5. Initial set pressure: the width is 1600-2000mm, the pressure is 850-1000 tons, the width is 1200-1600mm, the pressure is 750-900 tons, and the pressure can be properly increased according to the shape change of the plate by combining with the bending roller during the leveling process. 6. When the time for leveling the plate is longer than 5 days from the finishing time of hot rolling, the leveling speed is 80-100m/min in a stable plate shape state, the speed is reduced after the length reaches 400 meters, and when abnormal fluctuation occurs to the plate shape, the production speed is 50-80m/min until the automatic speed reduction production is completed. And when the time for leveling the machine is less than 5 days from the finishing time of hot rolling, the maximum leveling speed is 60-80m/min. 7. The crease-resistant roller must be used, and the defective plate-shaped portion must be used as a deep roll. 8. The upper and lower surfaces were inspected twice per roll: checking the length of the upper surface and the lower surface to be 10-15 meters when the vehicle starts; after automatic deceleration, the upper and lower surfaces are inspected for 5-10 meters. 9. Before production, the upper surface and the lower surface of the inlet pinch roll are opened to blow water air pipes.
Example 1
The Tai steel 2250 leveling unit produces high-strength wear-resistant steel TWR300TP with the specification of 3.0 multiplied by 1290mm, and the specific implementation steps are as follows: 1. leveling production must be arranged within one week after the hot rolling production is finished; 2. it is necessary to ensure that the width of the transition material produced by changing a new work roll is in the range 1290-2000 mm. 3. Before production, the upper surface and the lower surface of the inlet pinch roll are opened to blow water air pipes, and the air pressure is 0.6Mpa. 4. A plate-shaped stabilizing section, wherein the tension of an uncoiler is 2.0 kg/mm; the tension of the coiling machine is 3.0kg/mm, when the shape of the head and tail tension-free section is abnormal, the uncoiling tension is adjusted to 3.0kg/mm, and the coiling tension can be 6.0 kg/mm. 5. Initial set pressure: 750 tons, in the leveling process, the pressure can be properly increased by combining the bending roller adjustment according to the shape change. 6. When the time for leveling the plate and finishing hot rolling is longer than 5 days, the leveling speed is 100m/min under the stable state of the plate shape, the plate begins to slow down after the length reaches 400 meters, and when abnormal fluctuation occurs to the plate shape, the production speed is 80m/min until the automatic slow down production is finished. And when the time for leveling the machine is less than 5 days from the finishing time of hot rolling, the maximum leveling speed is 80m/min. 7. Before starting the vehicle, the crease-resist roller is used, and when the plate shape starts to deteriorate, the deep bending roller is used. 8. The upper and lower surfaces were inspected twice per roll: checking the length of the upper surface and the lower surface by 15 meters when the vehicle starts; after automatic deceleration, the upper and lower surfaces were inspected for 10 meters.
Example two
The Tai steel 2250 leveling machine set is used for producing high-strength wear-resistant steel TWR400 with the specification of 4.0 multiplied by 1800mm, and the specific implementation steps are as follows: 1. leveling production must be arranged within one week after the hot rolling production is finished; 2. it must be ensured that the width of the transition material produced by changing a new work roll is in the range 1800-2000 mm. 3. Before production, the upper surface and the lower surface of the inlet pinch roll are opened to blow water air pipes, and the air pressure is 0.65Mpa. 4. A plate-shaped stabilizing section, wherein the tension of an uncoiler is 1.8 kg/mm; the tension of the coiling machine is 3.2kg/mm, when the shape of the head-tail tension-free section is abnormal, the uncoiling tension is adjusted to 2.8kg/mm, and the coiling tension is 5.5 kg/mm. 5. Initial set pressure: in the leveling process, 850 tons of pressure can be properly increased by combining the bending roller adjustment according to the shape change. 6. When the time for leveling the plate and finishing hot rolling is longer than 5 days, the leveling speed is 100m/min under the stable state of the plate, the plate begins to slow down after the length reaches 350 meters, and when abnormal fluctuation occurs to the plate, the production speed is 60m/min until the automatic slow down production is finished. And when the time for leveling the machine is less than 5 days from the finishing time of hot rolling, the maximum leveling speed is 60m/min. 7. Before starting the vehicle, the crease-resist roller is used, and when the plate shape starts to deteriorate, the deep bending roller is used. 8. The upper and lower surfaces were inspected twice per roll: checking the length of the upper surface and the lower surface to be 12 meters when the vehicle starts; after automatic deceleration, the upper and lower surfaces were inspected for 10 meters.
Example III
The Tai steel 2250 leveling unit produces high-strength magnetic yoke steel 1000TM162 with the specification of 4.0 multiplied by 1500mm, and the specific implementation steps are as follows: 1. leveling production must be arranged within one week after the hot rolling production is finished; 2. it must be ensured that the width of the transition material produced by changing a new work roll is in the range 1800-2000 mm. 3. Setting the minimum channeling position of 1500mm to 40mm,4, and opening the upper and lower surface water blowing air pipes after the inlet pinch rolls before production, wherein the air pressure is 0.6Mpa. 5. A plate-shaped stabilizing section, wherein the tension of an uncoiler is 1.5 kg/mm; the tension of the coiling machine is 3.0kg/mm, when the shape of the head-tail tension-free section is abnormal, the uncoiling tension is adjusted to 2.6kg/mm, and the coiling tension is 3.5 kg/mm. 6. Initial set pressure: 950 tons, the pressure can be properly increased according to the shape change by combining with the bending roller adjustment in the leveling process. 7. When the time for leveling the plate and finishing hot rolling is longer than 5 days, the leveling speed is 100m/min under the stable state of the plate shape, the plate begins to slow down after the length reaches 400 meters, and when abnormal fluctuation occurs to the plate shape, the production speed is 80m/min until the automatic slow down production is finished. And when the time for leveling the machine is less than 5 days from the finishing time of hot rolling, the maximum leveling speed is 80m/min. 8. Before starting the car, the crease-resistant roller is put into use, and after starting the car, the deep bending roller is put into use immediately. 9. The upper and lower surfaces were inspected twice per roll: checking the length of the upper surface and the lower surface by 15 meters when the vehicle starts; after automatic deceleration, the upper and lower surfaces were inspected for 10 meters.
The above embodiments are merely examples of the present invention, but the present invention is not limited to the above embodiments, and any changes or modifications within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (2)
1. A leveling method of a ferrite martensite dual-phase ultrahigh-strength hot rolled coil is characterized by comprising the following steps of: the method comprises the following steps:
step one: after the hot rolling production of the ferrite martensite dual-phase ultrahigh-strength steel is finished, arranging the flat production within one week;
step two: changing a new working roller before production, and producing from wide to narrow after changing the working roller;
step three: setting a minimum roll shifting position allowed by the width according to the width specification;
step four: a water blowing air pipe is additionally arranged at the inlet of the leveling line straightener, compressed air with the pressure of 0.5-0.8Mpa is delivered during production, and residual cooling water attached to the surface of strip steel is quickly dried;
step five: the unwinding tension of the incoming material plate-shaped stabilizing section is 1.5-2.0 kg/mm; the tension of the coiling machine is set to be 2.5-3.5kg/mm, the tension of the leveling uncoiler is increased to be 2.6-3.2kg/mm in the leveling production process of the end section of the incoming material tensionless coiling head, and the tension of the coiling machine is increased to be 3.5-6.0 kg/mm;
step six: initially setting a pressure;
step seven: controlling the highest flat line running speed to be 60-100m/min;
step eight: a crease-resist roller is put into use, and a deep bending roller is put into use at a part with poor plate shape;
step nine: the upper and lower surfaces were inspected twice per roll: checking the length of the upper surface and the lower surface to be 10-15 meters when the vehicle starts; after automatic deceleration, the upper and lower surfaces are inspected for 5-10 meters.
2. The method for flattening a ferrite-martensite dual-phase ultrahigh-strength hot rolled plate according to claim 1, wherein the method comprises the following steps: the initial set pressure in the sixth step is specifically: the width is 1600-2000mm, the pressure is 850-1000 tons, the width is 1200-1600mm, and the pressure is 750-900 tons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311528535.1A CN117483435A (en) | 2023-11-16 | 2023-11-16 | Leveling method for ferrite-martensite dual-phase ultrahigh-strength hot rolled coil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311528535.1A CN117483435A (en) | 2023-11-16 | 2023-11-16 | Leveling method for ferrite-martensite dual-phase ultrahigh-strength hot rolled coil |
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| CN117483435A true CN117483435A (en) | 2024-02-02 |
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| CN202311528535.1A Pending CN117483435A (en) | 2023-11-16 | 2023-11-16 | Leveling method for ferrite-martensite dual-phase ultrahigh-strength hot rolled coil |
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| CN (1) | CN117483435A (en) |
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2023
- 2023-11-16 CN CN202311528535.1A patent/CN117483435A/en active Pending
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