CN114632824B - Method for controlling shape of 10-12mm thick steel plate of bridge steel - Google Patents
Method for controlling shape of 10-12mm thick steel plate of bridge steel Download PDFInfo
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- CN114632824B CN114632824B CN202210280107.0A CN202210280107A CN114632824B CN 114632824 B CN114632824 B CN 114632824B CN 202210280107 A CN202210280107 A CN 202210280107A CN 114632824 B CN114632824 B CN 114632824B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 216
- 239000010959 steel Substances 0.000 title claims abstract description 216
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005096 rolling process Methods 0.000 claims abstract description 194
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 230000001133 acceleration Effects 0.000 claims description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 238000005452 bending Methods 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 11
- 238000009749 continuous casting Methods 0.000 claims description 11
- 239000012535 impurity Substances 0.000 claims description 11
- 238000010079 rubber tapping Methods 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 10
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- 230000000694 effects Effects 0.000 abstract description 4
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- 238000004519 manufacturing process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000013461 design Methods 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
- 230000005855 radiation Effects 0.000 description 1
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/56—Elongation control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
Abstract
The invention discloses a method for controlling the shape of a 10-12mm thick steel plate of bridge steel, which mainly ensures the shape of the steel plate through proper heating, rolling and straightening processes and operation methods without adding any other equipment and additional investment. By using the method, the shape of the bridge steel plate with the thickness of 10-12mm is greatly improved, after the method is used, the additional cold correction quantity of the steel grade and the steel plate with the specification is reduced by 95 percent due to poor shape, and the shape improvement effect is quite obvious.
Description
Technical Field
The invention relates to the field of sports equipment, in particular to a method for controlling the shape of a 10-12mm thick steel plate of bridge steel.
Background
The bridge steel belongs to low-alloy high-strength structural steel, has good low-temperature toughness and welding performance, and is widely applied to bridge production and construction. Because bridge construction requires the size of the steel plate, a large number of bridge steels are produced by a wide-thick plate rolling mill, the width of the steel plate is wider, a large number of widths are more than 2600mm, the common thickness range of the steel plate is between 10 and 70mm, wherein the thickness of the steel plate with the thickness of 10 to 12mm is as thin as the steel plate, the width is wider, and meanwhile, the bridge steels are mostly rolled by adopting control, the final rolling temperature of the steel plate is low, and the rolling plate shape is not well controlled. When the steel plate is cooled after being cooled by the cooling bed, heat radiation and convection heat exchange exist between the upper surface and the lower surface of the steel plate and the environment, and the lower surface contacted with the cooling bed also has conduction heat transfer between the lower surface and the cooling bed, so that the heat transfer efficiency is higher than that of the upper surface contacted with air, the upper surface and the lower surface of the steel plate are unevenly cooled, and the temperature and the internal thermal stress of the steel plate are unevenly distributed. When the thermal stress exceeds the yield strength of the material, plastic deformation occurs, and the steel plate has plate-shaped defects such as warping, wave shape, transverse bending, bulge and the like, so that the flatness of the steel plate exceeds the standard, and the lower the ambient temperature is, the larger the deformation of the steel plate is. In order to ensure that the final flatness of the steel plate meets the use requirement, the steel plates with poor plate shapes and exceeding flatness are leveled again by a cold straightener, and extra manpower and material resources are added.
The patent publication CN103722023a "a TMCP high-strength ship plate shape control method" provides a ship plate shape control method. The method can greatly improve the one-time plate shape qualification rate of the high-strength ship plate. But the method is suitable for producing the ship plate with the thickness of 30-60mm and high strength, and is not suitable for producing bridge steel with thin specification.
The patent publication No. CN104138933A "control method for straightening medium waves of wide and thick plates" provides a control method for eliminating medium waves of wide and thick plates. The method has obvious effect of eliminating the wave in the steel plate. However, the method is not involved in eliminating plate defects such as bilateral waves, warping, bulging and the like of the steel plate.
The patent publication No. CN104511484A 'a hot rolled strip micro-wave shape control method' provides a hot rolled strip micro-wave shape control method. The steel plate shape produced by the method meets the requirements. But the method is suitable for the production of hot continuous rolling strip steel and is not suitable for the production of wide and thick plate rolling mills.
Disclosure of Invention
The invention aims to provide a method for controlling the shape of a 10-12mm thick steel plate of bridge steel, which can effectively solve the problem of poor shape of the thin bridge steel.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for controlling the shape of a 10-12mm thick steel plate of bridge steel, which comprises the following steps:
1) The thickness of the casting blank is 250mm, the tapping temperature of the continuous casting blank is 1200-1230 ℃, the total heating time is 240-360 minutes, and the heating time of a soaking section is not less than 45 minutes;
2) A finishing mill is used for replacing a newly ground working roll before rolling the steel plate with the specification, and rolling the steel plate with the width of more than 2800mm of other steel types before rolling the steel plate with the specification;
4) After the slab is heated, performing controlled rolling, wherein the initial rolling thickness of the first stage is the slab thickness, the initial rolling temperature of the first stage is 1190-1220 ℃, the final rolling temperature of the first stage is equal to or higher than 1050 ℃, the rolling speed of the first stage is 3.5-4.2 m/s, the biting speed is 1.5m/s, the acceleration of a stand is 1.6m/s2, the steel throwing distance is 2.8m, the first stage is finished on a roughing mill, the roughing mill adopts a flat roll, and the first stage is rolled until the initial rolling thickness of the second stage is reached; the initial rolling thickness of the second-stage steel plate is 4 times of the thickness of the finished steel plate, the initial rolling temperature of the second-stage steel plate is 940-1000 ℃, and the final rolling temperature of the second-stage steel plate is 790-830 ℃; the rolling speed of the second stage is 4.0-5.3 m/s, the biting speed of the second stage is 1.8m/s, the acceleration of a stand is 2.0m/s2, the bending force of the second stage is 1.5-2.8 MN, the convexity of a steel plate is controlled to be 40-80 um, a finishing mill adopts a CVC roller, and the idle speed of the last stage of the second stage is 2.0m/s;
5) After the rolling of the steel plate is finished, straightening the steel plate for 3 times by a hot straightening machine, wherein the final straightening temperature is controlled to be 510-570 ℃, and the straightening force is controlled to be 1200-2600 KN;
6) The thickness of the produced steel plate is 10-12mm, and the steel plate is produced on a wide-thick plate rolling mill.
Further, its chemical composition, =weight percent: c:0.09 to 0.11 percent; si:0.26 to 0.36 percent; mn:1.35 to 1.45 percent; nb is 0.023 to 0.033 percent; p is less than or equal to 0.014%; s is less than or equal to 0.004%; ca:0.0013 to 0.0028 percent; als:0.020 to 0.034 percent; the balance of iron and unavoidable impurities.
Further, producing a steel plate for a bridge with the thickness of 12mm, wherein the chemical components of the plate blank are as follows by weight percent: 0.09% of C, 0.36% of Si, 1.45% of Mn, 0.023% of Nb, 0.014% of P, 0.004% of S, 0.0028% of Ca and 0.020% of Als; the balance of iron and unavoidable impurities; the thickness of the casting blank is 250mm, the tapping temperature of the continuous casting blank is 1200 ℃, the total heating time is 240 minutes, and the heating time of a soaking section is 45 minutes; the finishing mill is used for replacing a newly ground working roll before rolling the steel plate, and rolling 20 steel plates of other steel grades with the width of 2800mm before rolling the steel grade; after the slab is heated, the controlled rolling is carried out, two-stage rolling is adopted, the initial rolling thickness of the first stage is the slab thickness, the initial rolling temperature of the first stage is 1190 ℃, the final rolling temperature of the first stage is 1050 ℃, the rolling speed of the first stage is 4.2m/s, the biting speed is 1.5m/s, and the acceleration of a stand is 1.6m/s 2 The steel throwing distance is 2.8m, the first stage is finished on a roughing mill, the roughing mill adopts a flat roll, and the first stage is rolled until the thickness of the initial rolling of the second stage is reached; the initial rolling thickness of the second-stage steel plate is 48mm, the initial rolling temperature of the second-stage steel plate is 940 ℃, and the final rolling temperature of the second-stage steel plate is 830 ℃; the rolling speed of the second stage is 5.3m/s, the biting speed is 1.8m/s, and the frame acceleration is 2.0m/s 2 In the second stage of rolling, the bending force is 2.8MN, the convexity of the steel plate is 80um, the finishing mill adopts a CVC roller, and the idle speed of the last pass in the second stage is 2.0m/s; after the rolling of the steel plate is finished, straightening the steel plate for 3 times by a hot straightening machine, wherein the final straightening temperature is 570 ℃, and the straightening force is 2600KN; the steel plate is produced on a wide and thick plate rolling mill, the final plate shape of the steel plate is good, and the flatness meets the standard requirement.
Further, a steel plate for a bridge with a thickness of 12mm is produced, and the chemical composition of the plate blank is as follows (according to weight percent): 0.11% of C, 0.26% of Si, 1.35% of Mn, 0.033% of Nb, 0.011% of P, 0.002% of S and 0.0013% of CaAls0.034%; the balance of iron and unavoidable impurities; the thickness of the casting blank is 250mm, the tapping temperature of the continuous casting blank is 1230 ℃, the total heating time is 360 minutes, and the heating time of a soaking section is 62 minutes; the finishing mill is replaced with a new grinding working roll before rolling the steel plate, and 30 steel plates of other steel grades with the width of 2930mm are rolled before rolling the steel grade; after the slab is heated, controlled rolling is carried out, two-stage rolling is adopted, the initial rolling thickness of the first stage is the slab thickness, the initial rolling temperature of the first stage is 1220 ℃, the final rolling temperature of the first stage is 1079 ℃, the rolling speed of the first stage is 3.5m/s, the biting speed is 1.5m/s, and the acceleration of a stand is 1.6m/s 2 The steel throwing distance is 2.8m, the first stage is finished on a roughing mill, the roughing mill adopts a flat roll, and the first stage is rolled until the thickness of the initial rolling of the second stage is reached; the initial rolling thickness of the second-stage steel plate is 40mm, the initial rolling temperature of the second-stage steel plate is 1000 ℃, and the final rolling temperature of the second-stage steel plate is 790 ℃; the rolling speed of the second stage is 4.0m/s, the biting speed is 1.8m/s, and the frame acceleration is 2.0m/s 2 In the second stage of rolling, the bending force is 1.5MN, the convexity of the steel plate is 40um, the finishing mill adopts a CVC roller, and the idle speed of the last pass in the second stage is 2.0m/s; after the rolling of the steel plate is finished, straightening the steel plate for 3 times by a hot straightening machine, wherein the final straightening temperature is 510 ℃, and the straightening force is 1200KN; the steel plate is produced on a wide and thick plate rolling mill, the final plate shape of the steel plate is good, and the flatness meets the standard requirement.
Further, a steel plate for a bridge with a thickness of 11mm is produced, and the chemical composition of the plate blank is as follows (according to weight percent): 0.10% of C, 0.29% of Si, 1.42% of Mn, 0.028% of Nb, 0.012% of P, 0.003% of S, 0.0019% of Ca and 0.029% of Als; the balance of iron and unavoidable impurities; the thickness of the casting blank is 250mm, the tapping temperature of the continuous casting blank is 1225 ℃, the total heating time is 342 minutes, and the heating time of a soaking section is 54 minutes; the finishing mill is replaced with a new grinding working roll before rolling the steel plate, and 26 steel plates of other steel grades with the width of 2950mm are rolled before rolling the steel grade; after the slab is heated, controlled rolling is carried out, two-stage rolling is adopted, the initial rolling thickness of the first stage is the thickness of the slab, and the initial rolling of the first stageThe temperature is 1215 ℃, the final rolling temperature of the first stage is 1068 ℃, the rolling speed of the first stage is 3.8m/s, the biting speed is 1.5m/s, and the acceleration of the stand is 1.6m/s 2 The steel throwing distance is 2.8m, the first stage is finished on a roughing mill, the roughing mill adopts a flat roll, and the first stage is rolled until the thickness of the initial rolling of the second stage is reached; the initial rolling thickness of the second-stage steel plate is 44mm, the initial rolling temperature of the second-stage steel plate is 970 ℃, and the final rolling temperature of the second-stage steel plate is 806 ℃; the rolling speed of the second stage is 4.5m/s, the biting speed is 1.8m/s, and the frame acceleration is 2.0m/s 2 In the second stage of rolling, the bending force is 2.3MN, the convexity of the steel plate is 53um, the finishing mill adopts a CVC roller, and the idle speed of the last pass in the second stage is 2.0m/s; after the rolling of the steel plate is finished, straightening the steel plate for 3 times by a hot straightening machine, wherein the final straightening temperature is 536 ℃, and the straightening force is 1852KN; the steel plate is produced on a wide and thick plate rolling mill, the final plate shape of the steel plate is good, and the flatness meets the standard requirement.
Compared with the prior art, the invention has the beneficial technical effects that:
the slab of the invention adopts longer heating time and soaking time, so that the heating temperature of the slab is uniform, the deformation of the steel plate is uniform during rolling, and the shape of the steel plate is easy to control. Before rolling the steel plate with the specification, finish rolling is performed to replace a newly ground working roll and a certain number of thicker and wider steel plates are rolled so as to ensure good working roll state and improve rolling stability. The roughing mill and the finishing mill adopt higher biting speed, rolling speed and frame acceleration during rolling, so as to reduce the temperature difference between the head and the tail of the steel plate and the plate body, thereby leading the head and the tail of the steel plate and the plate body to deform uniformly. The final rolling mill controls the rolling reduction twice, so as to reduce the rolling force, ensure that the convexity of the steel plate is easy to control and the wave shape of the steel plate is smaller. The blank passing speed is reduced when the last pass is blank, so that the time from the completion of rolling of the steel plate to the straightening machine can be increased, and the temperature of the steel plate during straightening can be reduced. The finish rolling adopts a CVC roller, and aims to conveniently control the convexity of the steel plate. Straightening the steel plate for three times through a hot straightening machine after rolling, wherein the aim is to reduce the final straightening temperature and the temperature difference between the steel plate and a cooling bed body when the steel plate is on a cooling bed, so that the risk of deformation when the steel plate is cooled on the cooling bed is reduced; the deformation defect of the steel plate can be fully eliminated due to the large straightening force.
The invention is simple to implement, and the shape of the steel plate is ensured mainly by adjusting the production process and the operation method. Therefore, no other equipment is needed to be added, and no additional investment is needed to be added. By using the method, the shape of the bridge steel plate with the thickness of 10-12mm is greatly improved, after the method is used, the additional cold correction quantity of the steel grade and the steel plate with the specification is reduced by 95 percent due to poor shape, and the shape improvement effect is quite obvious.
Detailed Description
Example 1
The steel plate for the bridge with the thickness of 12mm is produced, and the chemical components of the plate blank are as follows (according to weight percent): 0.09% of C, 0.36% of Si, 1.45% of Mn, 0.023% of Nb, 0.014% of P, 0.004% of S, 0.0028% of Ca and 0.020% of Als; the balance of iron and unavoidable impurities. The thickness of the casting blank is 250mm, the tapping temperature of the continuous casting blank is 1200 ℃, the total heating time is 240 minutes, and the heating time of the soaking section is 45 minutes. The finishing mill was replaced with a freshly ground work roll before rolling the steel sheet and 20 blocks 2800mm wide steel sheets of other steel grades were rolled before rolling the steel grade. After the slab is heated, performing controlled rolling, wherein the initial rolling thickness of the first stage is the slab thickness, the initial rolling temperature of the first stage is 1190 ℃, the final rolling temperature of the first stage is 1050 ℃, the rolling speed of the first stage is 4.2m/s, the biting speed is 1.5m/s, the frame acceleration is 1.6m/s2, the steel throwing distance is 2.8m, the first stage is finished on a roughing mill, the roughing mill adopts a flat roll, and the initial rolling thickness of the first stage is up to the initial rolling thickness of the second stage. The initial rolling thickness of the second-stage steel plate is 48mm, the initial rolling temperature of the second-stage steel plate is 940 ℃, and the final rolling temperature of the second-stage steel plate is 830 ℃; the rolling speed of the second stage is 5.3m/s, the biting speed of the second stage is 1.8m/s, the acceleration of a stand is 2.0m/s2, the bending force of the second stage is 2.8MN, the convexity of a steel plate is 80um, a finishing mill adopts a CVC roller, and the blank passing speed of the last pass of the second stage is 2.0m/s. After the rolling of the steel plate is completed, straightening is carried out for 3 times by a hot straightening machine, the final straightening temperature is 570 ℃, and the straightening force is 2600KN. And (3) producing on a wide and thick plate rolling mill. The final shape of the steel plate is good, and the flatness meets the standard requirement.
Example 2
The steel plate for the bridge with the thickness of 12mm is produced, and the chemical components of the plate blank are as follows (according to weight percent): 0.11% of C, 0.26% of Si, 1.35% of Mn, 0.033% of Nb, 0.011% of P, 0.002% of S, 0.0013% of Ca and 0.034% of Als; the balance of iron and unavoidable impurities. The thickness of the casting blank is 250mm, the tapping temperature of the continuous casting blank is 1230 ℃, the total heating time is 360 minutes, and the heating time of the soaking section is 62 minutes. The finishing mill was replaced with a new ground work roll before rolling the steel sheet and 30 blocks of steel sheets of other steel grades 2930mm wide were rolled before rolling the steel grade. After the slab is heated, performing controlled rolling, wherein the initial rolling thickness of the first stage is the slab thickness, the initial rolling temperature of the first stage is 1220 ℃, the final rolling temperature of the first stage is 1079 ℃, the rolling speed of the first stage is 3.5m/s, the biting speed is 1.5m/s, the frame acceleration is 1.6m/s2, the steel throwing distance is 2.8m, the first stage is finished on a roughing mill, the roughing mill adopts a flat roll, and the initial rolling thickness of the first stage is up to the initial rolling thickness of the second stage. The initial rolling thickness of the second-stage steel plate is 40mm, the initial rolling temperature of the second-stage steel plate is 1000 ℃, and the final rolling temperature of the second-stage steel plate is 790 ℃; the rolling speed of the second stage is 4.0m/s, the biting speed of the second stage is 1.8m/s, the acceleration of a stand is 2.0m/s2, the bending force of the second stage is 1.5MN, the convexity of a steel plate is 40um, a finishing mill adopts a CVC roller, and the rolling speed of the last stage of the second stage is 2.0m/s. After the rolling of the steel plate is completed, straightening is carried out for 3 times by a hot straightening machine, the final straightening temperature is 510 ℃, and the straightening force is 1200KN. And (3) producing on a wide and thick plate rolling mill. The final shape of the steel plate is good, and the flatness meets the standard requirement.
Example 3
The steel plate for the bridge with the thickness of 11mm is produced, and the chemical components of the plate blank are as follows (according to weight percent): 0.10% of C, 0.29% of Si, 1.42% of Mn, 0.028% of Nb, 0.012% of P, 0.003% of S, 0.0019% of Ca and 0.029% of Als; the balance of iron and unavoidable impurities. The thickness of the casting blank is 250mm, the tapping temperature of the continuous casting blank is 1225 ℃, the total heating time is 342 minutes, and the heating time of the soaking section is 54 minutes. The finishing mill was replaced with a new ground work roll before rolling the steel sheet and 26 pieces of steel sheet of other steel grades 2950mm wide were rolled before rolling the steel grade. After the slab is heated, performing controlled rolling, wherein the initial rolling thickness of the first stage is the slab thickness, the initial rolling temperature of the first stage is 1215 ℃, the final rolling temperature of the first stage is 1068 ℃, the rolling speed of the first stage is 3.8m/s, the biting speed is 1.5m/s, the frame acceleration is 1.6m/s2, the steel throwing distance is 2.8m, the first stage is finished on a roughing mill, the roughing mill adopts a flat roll, and the initial rolling thickness of the first stage is up to the initial rolling thickness of the second stage. The initial rolling thickness of the second-stage steel plate is 44mm, the initial rolling temperature of the second-stage steel plate is 970 ℃, and the final rolling temperature of the second-stage steel plate is 806 ℃; the rolling speed of the second stage is 4.5m/s, the biting speed of the second stage is 1.8m/s, the frame acceleration is 2.0m/s2, the bending force of the second stage is 2.3MN, the convexity of the steel plate is 53um, the finishing mill adopts a CVC roller, and the blank passing speed of the last pass of the second stage is 2.0m/s. After the rolling of the steel plate is completed, straightening is carried out for 3 times by a hot straightening machine, the final straightening temperature is 536 ℃, and the straightening force is 1852KN. And (3) producing on a wide and thick plate rolling mill. The final shape of the steel plate is good, and the flatness meets the standard requirement.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (5)
1. A method for controlling the shape of a 10-12mm thick steel plate of bridge steel is characterized by comprising the following steps: comprising the following steps:
1) The thickness of the casting blank is 250mm, the tapping temperature of the continuous casting blank is 1200-1230 ℃, the total heating time is 240-360 minutes, and the heating time of a soaking section is not less than 45 minutes;
2) A finishing mill is used for replacing a newly ground working roll before rolling the steel plate with the specification, and rolling the steel plate with the width of more than 2800mm of other steel types before rolling the steel plate with the specification;
4) After the slab is heated, performing controlled rolling, wherein the initial rolling thickness of the first stage is the slab thickness, the initial rolling temperature of the first stage is 1190-1220 ℃, the final rolling temperature of the first stage is equal to or higher than 1050 ℃, the rolling speed of the first stage is 3.5-4.2 m/s, the biting speed is 1.5m/s, the acceleration of a stand is 1.6m/s2, the steel throwing distance is 2.8m, the first stage is finished on a roughing mill, the roughing mill adopts a flat roll, and the first stage is rolled until the initial rolling thickness of the second stage is reached; the initial rolling thickness of the second-stage steel plate is 4 times of the thickness of the finished steel plate, the initial rolling temperature of the second-stage steel plate is 940-1000 ℃, and the final rolling temperature of the second-stage steel plate is 790-830 ℃; the rolling speed of the second stage is 4.0-5.3 m/s, the biting speed of the second stage is 1.8m/s, the acceleration of a stand is 2.0m/s2, the bending force of the second stage is 1.5-2.8 MN, the convexity of a steel plate is controlled to be 40-80 um, a finishing mill adopts a CVC roller, and the idle speed of the last stage of the second stage is 2.0m/s;
5) After the rolling of the steel plate is finished, straightening the steel plate for 3 times by a hot straightening machine, wherein the final straightening temperature is controlled to be 510-570 ℃, and the straightening force is controlled to be 1200-2600 KN;
6) The thickness of the produced steel plate is 10-12mm, and the steel plate is produced on a wide-thick plate rolling mill.
2. The bridge steel 10-12mm thick steel plate shape control method according to claim 1, characterized in that: the chemical components of the paint comprise the following components in percentage by weight: c:0.09 to 0.11 percent; si:0.26 to 0.36 percent; mn:1.35 to 1.45 percent; nb is 0.023 to 0.033 percent; p is less than or equal to 0.014%; s is less than or equal to 0.004%; ca:0.0013 to 0.0028 percent; als:0.020 to 0.034 percent; the balance of iron and unavoidable impurities.
3. The bridge steel 10-12mm thick steel plate shape control method according to claim 2, characterized in that: the steel plate for the bridge with the thickness of 12mm is produced, and the chemical components of the plate blank are as follows by weight percent: 0.09% of C, 0.36% of Si, 1.45% of Mn, 0.023% of Nb, 0.014% of P, 0.004% of S, 0.0028% of Ca and 0.020% of Als; the balance of iron and unavoidable impurities; the thickness of the casting blank is 250mm, the tapping temperature of the continuous casting blank is 1200 ℃, the total heating time is 240 minutes, and the heating time of a soaking section is 45 minutes; the finishing mill is used for replacing a newly ground working roll before rolling the steel plate, and rolling 20 steel plates of other steel grades with the width of 2800mm before rolling the steel grade; after the slab is heated, the controlled rolling is carried out, two-stage rolling is adopted, the initial rolling thickness of the first stage is the slab thickness, the initial rolling temperature of the first stage is 1190 ℃, the final rolling temperature of the first stage is 1050 ℃, the rolling speed of the first stage is 4.2m/s, the biting speed is 1.5m/s, and the acceleration of a stand is 1.6m/s 2 The steel throwing distance is 2.8m, the first stage is finished on a roughing mill, the roughing mill adopts a flat roll, and the first stage is rolled until the thickness of the initial rolling of the second stage is reached; the initial rolling thickness of the second-stage steel plate is 48mm, the initial rolling temperature of the second-stage steel plate is 940 ℃, and the final rolling temperature of the second-stage steel plate is 830 ℃; the rolling speed of the second stage is 5.3m/s, the biting speed is 1.8m/s, and the frame acceleration is 2.0m/s 2 In the second stage of rolling, the bending force is 2.8MN, the convexity of the steel plate is 80um, the finishing mill adopts a CVC roller, and the idle speed of the last pass in the second stage is 2.0m/s; after the rolling of the steel plate is finished, straightening the steel plate for 3 times by a hot straightening machine, wherein the final straightening temperature is 570 ℃, and the straightening force is 2600KN; the steel plate is produced on a wide and thick plate rolling mill, the final plate shape of the steel plate is good, and the flatness meets the standard requirement.
4. The bridge steel 10-12mm thick steel plate shape control method according to claim 1, characterized in that: the steel plate for the bridge with the thickness of 12mm is produced, and the chemical components of the plate blank are as follows by weight percent: 0.11% of C, 0.26% of Si, 1.35% of Mn, 0.033% of Nb, 0.011% of P, 0.002% of S, 0.0013% of Ca and 0.034% of Als; the rest areIron and unavoidable impurities; the thickness of the casting blank is 250mm, the tapping temperature of the continuous casting blank is 1230 ℃, the total heating time is 360 minutes, and the heating time of a soaking section is 62 minutes; the finishing mill is replaced with a new grinding working roll before rolling the steel plate, and 30 steel plates of other steel grades with the width of 2930mm are rolled before rolling the steel grade; after the slab is heated, controlled rolling is carried out, two-stage rolling is adopted, the initial rolling thickness of the first stage is the slab thickness, the initial rolling temperature of the first stage is 1220 ℃, the final rolling temperature of the first stage is 1079 ℃, the rolling speed of the first stage is 3.5m/s, the biting speed is 1.5m/s, and the acceleration of a stand is 1.6m/s 2 The steel throwing distance is 2.8m, the first stage is finished on a roughing mill, the roughing mill adopts a flat roll, and the first stage is rolled until the thickness of the initial rolling of the second stage is reached; the initial rolling thickness of the second-stage steel plate is 40mm, the initial rolling temperature of the second-stage steel plate is 1000 ℃, and the final rolling temperature of the second-stage steel plate is 790 ℃; the rolling speed of the second stage is 4.0m/s, the biting speed is 1.8m/s, and the frame acceleration is 2.0m/s 2 In the second stage of rolling, the bending force is 1.5MN, the convexity of the steel plate is 40um, the finishing mill adopts a CVC roller, and the idle speed of the last pass in the second stage is 2.0m/s; after the rolling of the steel plate is finished, straightening the steel plate for 3 times by a hot straightening machine, wherein the final straightening temperature is 510 ℃, and the straightening force is 1200KN; the steel plate is produced on a wide and thick plate rolling mill, the final plate shape of the steel plate is good, and the flatness meets the standard requirement.
5. The bridge steel 10-12mm thick steel plate shape control method according to claim 1, characterized in that: the steel plate for the bridge with the thickness of 11mm is produced, and the chemical components of the plate blank are as follows by weight percent: 0.10% of C, 0.29% of Si, 1.42% of Mn, 0.028% of Nb, 0.012% of P, 0.003% of S, 0.0019% of Ca and 0.029% of Als; the balance of iron and unavoidable impurities; the thickness of the casting blank is 250mm, the tapping temperature of the continuous casting blank is 1225 ℃, the total heating time is 342 minutes, and the heating time of a soaking section is 54 minutes; the finishing mill is replaced with a new grinding working roll before rolling the steel plate, and 26 steel plates of other steel grades with the width of 2950mm are rolled before rolling the steel grade; the slab is heated wellAnd then performing controlled rolling, wherein the thickness of the first-stage rolling is the thickness of a plate blank, the initial rolling temperature of the first-stage rolling is 1215 ℃, the final rolling temperature of the first-stage rolling is 1068 ℃, the rolling speed of the first-stage rolling is 3.8m/s, the biting speed is 1.5m/s, and the acceleration of a stand is 1.6m/s 2 The steel throwing distance is 2.8m, the first stage is finished on a roughing mill, the roughing mill adopts a flat roll, and the first stage is rolled until the thickness of the initial rolling of the second stage is reached; the initial rolling thickness of the second-stage steel plate is 44mm, the initial rolling temperature of the second-stage steel plate is 970 ℃, and the final rolling temperature of the second-stage steel plate is 806 ℃; the rolling speed of the second stage is 4.5m/s, the biting speed is 1.8m/s, and the frame acceleration is 2.0m/s 2 In the second stage of rolling, the bending force is 2.3MN, the convexity of the steel plate is 53um, the finishing mill adopts a CVC roller, and the idle speed of the last pass in the second stage is 2.0m/s; after the rolling of the steel plate is finished, straightening the steel plate for 3 times by a hot straightening machine, wherein the final straightening temperature is 536 ℃, and the straightening force is 1852KN; the steel plate is produced on a wide and thick plate rolling mill, the final plate shape of the steel plate is good, and the flatness meets the standard requirement.
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|---|---|---|---|---|
| US3561237A (en) * | 1967-11-29 | 1971-02-09 | Westinghouse Electric Corp | Predictive gauge control method and apparatus for metal rolling mills |
| CN106987773A (en) * | 2017-05-05 | 2017-07-28 | 内蒙古包钢钢联股份有限公司 | A kind of high strength steel plate and its board-shape control method |
| CN108838212A (en) * | 2018-06-29 | 2018-11-20 | 首钢京唐钢铁联合有限责任公司 | A kind of control method of hot rolling roughing mill |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3561237A (en) * | 1967-11-29 | 1971-02-09 | Westinghouse Electric Corp | Predictive gauge control method and apparatus for metal rolling mills |
| CN106987773A (en) * | 2017-05-05 | 2017-07-28 | 内蒙古包钢钢联股份有限公司 | A kind of high strength steel plate and its board-shape control method |
| CN108838212A (en) * | 2018-06-29 | 2018-11-20 | 首钢京唐钢铁联合有限责任公司 | A kind of control method of hot rolling roughing mill |
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| 采用"差动咬入法"控制中厚板轧制板头弯曲;江定辉;武汉科技大学学报(自然科学版)(03);全文 * |
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