CN114632824A - Method for controlling shape of steel plate with thickness of 10-12mm for bridge steel - Google Patents
Method for controlling shape of steel plate with thickness of 10-12mm for bridge steel Download PDFInfo
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- CN114632824A CN114632824A CN202210280107.0A CN202210280107A CN114632824A CN 114632824 A CN114632824 A CN 114632824A CN 202210280107 A CN202210280107 A CN 202210280107A CN 114632824 A CN114632824 A CN 114632824A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 191
- 239000010959 steel Substances 0.000 title claims abstract description 191
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims abstract description 186
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 230000001133 acceleration Effects 0.000 claims description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- 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
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 238000010079 rubber tapping Methods 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- 238000013000 roll bending Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000002436 steel type Substances 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000007547 defect Effects 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
- 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
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect 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
- 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
-
- 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 steel plate with the thickness of 10-12mm for 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 extra investment. By using the method, the plate shape of the bridge steel plate with the thickness of 10-12mm is greatly improved, after the method is used, the amount of the additional cold straightening of the steel type and the steel plate with the specification due to poor plate shape is reduced by 95%, and the plate shape improvement effect is very obvious.
Description
Technical Field
The invention relates to the field of sports equipment, in particular to a method for controlling the shape of a steel plate with the thickness of 10-12mm 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. Due to the requirement of bridge construction on the size of a steel plate, a lot of bridge steels are produced by a wide and thick plate rolling mill, the width of the steel plate is wide, the width of the steel plate is more than 2600mm, the common thickness range of the steel plate is 10-70 mm, the width of the 10-12mm thick steel plate is wide due to the fact that the steel plate is thin, meanwhile, the bridge steels are mostly rolled in a controlled mode, the final rolling temperature of the steel plate is low, and the rolled plate shape is not well controlled. When the steel plate is cooled after being cooled on the cooling bed, thermal radiation and convective heat transfer exist between the upper surface and the lower surface of the steel plate and the environment, the lower surface in contact with the cooling bed is in conduction heat transfer with the cooling bed, the heat transfer efficiency of the lower surface is higher than that of the upper surface in contact with air, so that the cooling of the upper surface and the lower surface of the steel plate is uneven, and the distribution of the temperature and the internal thermal stress of the steel plate is uneven. When the thermal stress exceeds the yield strength of the material, plastic deformation occurs, and the steel plate has the defects of warping, wave shape, transverse bending, bulging and the like, so that the flatness of the steel plate exceeds the standard, and the lower the environmental 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 excessive flatness need to be leveled again by a cold straightener, and extra manpower and material resources are added.
The patent publication No. CN103722023A entitled "method for controlling plate shape of TMCP high-strength ship plate" provides a method for controlling plate shape of ship plate. The method can greatly improve the primary plate shape qualification rate of the high-strength ship plate. But the method is suitable for producing high-strength ship plates with the thickness of 30-60mm and is not suitable for producing thin bridge steel.
The patent publication CN104138933A entitled "control method for straightening the swell of wide and thick plate" provides a control method for eliminating the swell of wide and thick plate. The method has obvious effect on eliminating the middle waves of the steel plate. But the method does not relate to the elimination of the plate shape defects of double-side waves, warping, bulges and the like of the steel plate.
The patent publication No. CN104511484A discloses a method for controlling the shape of a hot-rolled strip steel by a micro-wave plate shape. The shape of the steel plate produced by the method meets the requirement. 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 plate shape of a steel plate with the thickness of 10-12mm for bridge steel, which can effectively solve the problem of poor plate shape of 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 steel plate with the thickness of 10-12mm of bridge steel, which comprises the following steps:
1) the thickness of a 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) before rolling the steel plate of the steel grade with the specification, replacing a newly ground working roll by a finishing mill, and rolling 20-30 steel plates of other steel grades with the width of more than 2800mm before rolling the steel grade;
4) the method comprises the following steps of heating a plate blank, performing controlled rolling, and performing two-stage rolling, wherein the initial rolling thickness of the first stage is the plate blank thickness, the initial rolling temperature of the first stage is 1190-1220 ℃, the final rolling temperature of the first stage is not less than 1050 ℃, the rolling speed of the first stage is 3.5-4.2 m/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 first stage is rolled to the initial rolling thickness of the second stage; 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 is 790-830 ℃; 7 passes are rolled in the second stage, the last pass is a blank pass, the reduction ratios of the 5 th pass and the 6 th pass in the second stage are controlled to be 12-17%, the rolling speed in the second stage is 4.0-5.3 m/s, the biting speed is 1.8m/s, the acceleration of a rack is 2.0m/s2, the bending roll force is 1.5-2.8 MN during the rolling in the second stage, the convexity of a steel plate is controlled to be 40-80 um, a finishing mill adopts a CVC roll, and the blank pass speed of the last pass in the second stage is 2.0 m/s;
5) after the steel plate is rolled, straightening for 3 times by a hot straightening machine, controlling the final straightening temperature to be 510-570 ℃, and controlling the straightening force 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 and thick plate rolling mill.
Further, the chemical components comprise the following components in percentage by weight: c: 0.09-0.11%; si: 0.26-0.36%; mn: 1.35-1.45%; 0.023 to 0.033 percent of Nb; p is less than or equal to 0.014%; s is less than or equal to 0.004 percent; ca: 0.0013-0.0028%; and Als: 0.020-0.034%; the balance of iron and unavoidable impurities.
Further, a 12mm thick steel plate for a bridge is produced, and the plate blank comprises the following chemical components in percentage by weight: 0.09% of C, 0.36% of Si, 1.45% of Mn1, 0.023% of Nb0.014% of P, 0.004% of S, 0.0028% of Ca0, and 0.020% of Als0; the balance of iron and inevitable impurities; the thickness of a 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 replaces the newly ground work rolls before rolling the steel plate and rolls 20 pieces of steel plates of other steel grades 2800mm wide before rolling the steel grade; and (3) performing controlled rolling after the plate blank is heated, wherein two-stage rolling is adopted, the initial rolling thickness of the first stage is the plate blank 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 the rack is 1.6m/s2The 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 to the initial rolling thickness of the second stage; the initial rolling thickness of the second stage steel plate is 48mm, and the second stage steelThe initial rolling temperature of the plate is 940 ℃, and the final rolling temperature of the second stage is 830 ℃; 7 passes are rolled in the second stage, the last pass is a blank pass, the reduction rates of the 5 th pass and the 6 th pass in the second stage are respectively 17 percent and 12 percent, the rolling speed in the second stage is 5.3m/s, the biting speed is 1.8m/s, and the acceleration of the rack is 2.0m/s2When rolling in the second stage, the roll bending force is 2.8MN, the convexity of the steel plate is 80um, the finishing mill adopts a CVC roll, and the idle passing speed of the last pass in the second stage is 2.0 m/s; after the steel plate is rolled, straightening for 3 times by a hot straightening machine, wherein the final straightening temperature is 570 ℃, and the straightening force is 2600 KN; the final shape of the steel plate is good when the steel plate is produced on a wide and thick plate rolling mill, and the straightness meets the standard requirement.
Further, a steel plate for a bridge with the thickness of 12mm is produced, and the chemical components of the plate blank are as follows (in percentage by weight): 0.11 percent of C, 0.26 percent of Si, 1.35 percent of Mn1, 0.033 percent of Nb0.011 percent of P, 0.002 percent of S, 0.0013 percent of Ca0, and 0.034 percent of Als0; the balance of iron and inevitable 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; before rolling the steel plate, the finishing mill replaces a newly ground working roll, and rolls 30 steel plates of other 2930mm wide steel grades before rolling the steel grade; the controlled rolling is carried out after the plate blank is heated, two-stage rolling is adopted, the initial rolling thickness of the first stage is the plate blank 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 the rack is 1.6m/s2The 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 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 is 790 ℃; 7 passes of rolling in the second stage, the last pass is a blank pass, the reduction rates of the 5 th pass and the 6 th pass in the second stage are respectively 16.8 percent and 12 percent, the rolling speed in the second stage is 4.0m/s, the biting speed is 1.8m/s, and the acceleration of the rack is 2.0m/s2When rolling in the second stage, the roll bending force is 1.5MN, the convexity of the steel plate is 40um, the finishing mill adopts a CVC roll, and the last pass of the second stageThe idle speed of (2.0 m/s); straightening the steel plate for 3 times by a hot straightening machine after the steel plate is rolled, wherein the final straightening temperature is 510 ℃, and the straightening force is 1200 KN; the final shape of the steel plate is good when the steel plate is produced on a wide and thick plate rolling mill, and the straightness meets the standard requirement.
Further, a steel plate for a bridge with the thickness of 11mm is produced, and the chemical components of the plate blank are as follows (in percentage by weight): 0.10% of C, 0.29% of Si, 1.42% of Mn1, 0.028% of Nb0, 0.012% of P, 0.003% of S, 0.0019% of Ca0, and 0.029% of Als0; the balance of iron and inevitable impurities; the thickness of a 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 was replaced with a new ground work roll before rolling the plate and 26 plates of other 2950mm wide steel grades were rolled before rolling the grade; the controlled rolling is carried out after the plate blank is heated, two-stage rolling is adopted, the initial rolling thickness of the first stage is the plate blank 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, and the acceleration of the rack is 1.6m/s2The 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 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 is 806 ℃; 7 passes of rolling in the second stage, the last pass is a blank pass, the rolling reduction rates of the 5 th pass and the 6 th pass in the second stage are respectively 16.4 percent and 12.8 percent, the rolling speed in the second stage is 4.5m/s, the biting speed is 1.8m/s, and the acceleration of the rack is 2.0m/s2When rolling in the second stage, the roll bending force is 2.3MN, the convexity of the steel plate is 53um, a finishing mill adopts a CVC roll, and the idle passing speed of the last pass in the second stage is 2.0 m/s; straightening the steel plate for 3 times by a hot straightening machine after the steel plate is rolled, wherein the final straightening temperature is 536 ℃, and the straightening force is 1852 KN; the final shape of the steel plate is good when the steel plate is produced on a wide and thick plate rolling mill, and the straightness 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, which aims to ensure that the heating temperature of the slab is uniform, thus 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 of the steel grade, a newly ground working roll is replaced by finish rolling, and a certain number of thicker and wider steel plates are rolled so as to ensure that the working roll is in a good state and improve the rolling stability. The roughing mill and the finishing mill adopt higher biting speed, rolling speed and rack acceleration during rolling, and are used for reducing the temperature difference between the head and the tail of the steel plate and the plate body, so that the deformation of the head and the tail of the steel plate and the plate body is uniform. The final two passes of the finishing mill control the reduction rate, and the purpose is to reduce the rolling force, so that the convexity of the steel plate is easy to control, and the wave shape of the steel plate is small. And the idle passing speed is reduced when the last pass is idle passing, so that the time from the completion of the rolling of the steel plate to the straightening machine can be increased, and the temperature of the steel plate during straightening is reduced. The CVC roller is adopted in finish rolling, and the purpose is to facilitate the control of the convexity of the steel plate. The steel plate is straightened for three times by the hot straightening machine after being rolled, so that the final straightening temperature is reduced, the temperature difference between the steel plate and the cooling bed body is reduced when the steel plate is arranged on the cooling bed, and the risk of deformation of the steel plate when the steel plate is cooled on the cooling bed is reduced; the large straightening force can fully eliminate the deformation defect of the steel plate.
The method 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 required to be added, and no additional investment is required to be added. By using the method, the plate shape of the bridge steel plate with the thickness of 10-12mm is greatly improved, after the method is used, the amount of the additional cold straightening of the steel type and the steel plate with the specification due to poor plate shape is reduced by 95%, and the plate shape improvement effect is very 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 (in percentage by weight): 0.09% of C, 0.36% of Si, 1.45% of Mn1, 0.023% of Nb0.014% of P, 0.004% of S, 0.0028% of Ca0, and 0.020% of Als0; 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 new ground work roll before rolling the plate, and 20 pieces of 2800mm wide plate of another steel grade were rolled before rolling the grade. And (3) performing controlled rolling after the plate blank is heated, and performing two-stage rolling, wherein the initial rolling thickness of the first stage is the plate blank 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 flat rolls, and the first stage is rolled 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 is 830 ℃; 7 passes are rolled in the second stage, the last pass is a blank pass, the reduction ratios of the 5 th pass and the 6 th pass in the second stage are respectively 17% and 12%, the rolling speed in the second stage is 5.3m/s, the biting speed is 1.8m/s, the acceleration of the rack is 2.0m/s2, the roll bending force is 2.8MN during the rolling in the second stage, the convexity of the steel plate is 80um, a CVC roller is adopted by a finishing mill, and the blank pass speed in the last pass in the second stage is 2.0 m/s. And after the steel plate is rolled, straightening for 3 times by a hot straightening machine, wherein the final straightening temperature is 570 ℃, and the straightening force is 2600 KN. The product is produced on a wide and thick plate mill. The final plate shape of the steel plate is good, and the straightness 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 (in percentage by weight): 0.11 percent of C, 0.26 percent of Si, 1.35 percent of Mn1, 0.033 percent of Nb0.011 percent of P, 0.002 percent of S, 0.0013 percent of Ca0, and 0.034 percent of Als0; 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 plate, and 30 blocks of 2930mm wide plates of other steel grades were rolled before rolling the grade. And (3) performing controlled rolling after the plate blank is heated, and performing two-stage rolling, wherein the initial rolling thickness of the first stage is the plate blank 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 flat rolls, and the first stage is rolled 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 is 790 ℃; 7 passes are rolled in the second stage, the last pass is a blank pass, the reduction ratios of the 5 th pass and the 6 th pass in the second stage are respectively 16.8 percent and 12 percent, the rolling speed in the second stage is 4.0m/s, the biting speed is 1.8m/s, the acceleration of the rack is 2.0m/s2, the bending roll force is 1.5MN during the rolling in the second stage, the convexity of the steel plate is 40um, a CVC roll is adopted by a finishing mill, and the blank pass speed in the last pass in the second stage is 2.0 m/s. And straightening the steel plate for 3 times by a hot straightening machine after the steel plate is rolled, wherein the final straightening temperature is 510 ℃, and the straightening force is 1200 KN. The production is carried out on a wide and thick plate rolling mill. The final plate shape of the steel plate is good, and the straightness 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 (in percentage by weight): 0.10% of C, 0.29% of Si, 1.42% of Mn1, 0.028% of Nb0, 0.012% of P, 0.003% of S, 0.0019% of Ca0, and 0.029% of Als0; 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 plate and 26 blocks of 2950mm wide steel plate of another grade were rolled before rolling the grade. And (3) performing controlled rolling after the plate blank is heated, wherein two-stage rolling is adopted, the initial rolling thickness of the first stage is the plate blank 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 flat rolls, and the first stage is rolled 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 is 806 ℃; 7 passes are rolled in the second stage, the last pass is a blank pass, the reduction ratios of the 5 th pass and the 6 th pass in the second stage are respectively 16.4 percent and 12.8 percent, the rolling speed in the second stage is 4.5m/s, the biting speed is 1.8m/s, the acceleration of a rack is 2.0m/s2, the bending roll force is 2.3MN during the rolling in the second stage, the convexity of a steel plate is 53um, a finishing mill adopts a CVC roll, and the blank pass speed in the last pass in the second stage is 2.0 m/s. And after the steel plate is rolled, straightening for 3 times by a hot straightening machine, wherein the final straightening temperature is 536 ℃, and the straightening force is 1852 KN. The product is produced on a wide and thick plate mill. The final plate shape of the steel plate is good, and the straightness meets the standard requirement.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. A method for controlling the shape of a steel plate with the thickness of 10-12mm for bridge steel is characterized by comprising the following steps: the method comprises the following steps:
1) the thickness of a 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) before rolling the steel plate of the steel grade with the specification, replacing a newly ground working roll by a finishing mill, and rolling 20-30 steel plates of other steel grades with the width of more than 2800mm before rolling the steel grade;
4) the method comprises the following steps of heating a plate blank, performing controlled rolling, and performing two-stage rolling, wherein the initial rolling thickness of the first stage is the plate blank thickness, the initial rolling temperature of the first stage is 1190-1220 ℃, the final rolling temperature of the first stage is not less than 1050 ℃, the rolling speed of the first stage is 3.5-4.2 m/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 first stage is rolled to the initial rolling thickness of the second stage; 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 is 790-830 ℃; 7 passes are rolled in the second stage, the last pass is a blank pass, the reduction ratios of the 5 th pass and the 6 th pass in the second stage are controlled to be 12-17%, the rolling speed in the second stage is 4.0-5.3 m/s, the biting speed is 1.8m/s, the acceleration of a rack is 2.0m/s2, the bending roll force is 1.5-2.8 MN during the rolling in the second stage, the convexity of a steel plate is controlled to be 40-80 um, a finishing mill adopts a CVC roll, and the blank pass speed of the last pass in the second stage is 2.0 m/s;
5) after the steel plate is rolled, straightening for 3 times by a hot straightening machine, controlling the final straightening temperature to be 510-570 ℃, and controlling the straightening force 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 and thick plate rolling mill.
2. The method for controlling the plate shape of a bridge steel 10-12mm thick steel plate according to claim 1, wherein: the chemical components by weight percentage are as follows: c: 0.09-0.11%; si: 0.26-0.36%; mn: 1.35-1.45%; 0.023 to 0.033 percent of Nb; p is less than or equal to 0.014%; s is less than or equal to 0.004 percent; ca: 0.0013 to 0.0028 percent; and (3) Als: 0.020-0.034%; the balance of iron and unavoidable impurities.
3. The method for controlling the plate shape of a bridge steel 10-12mm thick steel plate according to claim 2, wherein: the steel plate for the bridge with the thickness of 12mm is produced, and the plate blank comprises the following chemical components in percentage by weight: 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 inevitable impurities; the thickness of a 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 replaces the newly ground work rolls before rolling the steel plate and rolls 20 pieces of steel plates of other steel grades 2800mm wide before rolling the steel grade; the controlled rolling is carried out after the plate blank is heated, two-stage rolling is adopted, the initial rolling thickness of the first stage is the plate blank 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 the frame is 1.6m/s2The 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 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 finish rolling temperature of the second stage is 830 ℃; 7 passes of rolling in the second stage, wherein the last pass is a blank pass, and the 5 th pass and the 6 th pass in the second stageThe rolling reduction of each pass is 17 percent and 12 percent respectively, the rolling speed of the second stage is 5.3m/s, the biting speed is 1.8m/s, and the acceleration of the stand is 2.0m/s2When rolling in the second stage, the roll bending force is 2.8MN, the convexity of the steel plate is 80um, the finishing mill adopts a CVC roll, and the idle passing speed of the last pass in the second stage is 2.0 m/s; after the steel plate is rolled, straightening for 3 times by a hot straightening machine, wherein the final straightening temperature is 570 ℃, and the straightening force is 2600 KN; the final shape of the steel plate is good when the steel plate is produced on a wide and thick plate rolling mill, and the straightness meets the standard requirement.
4. The method for controlling the plate shape of a bridge steel 10-12mm thick steel plate according to claim 1, wherein: the steel plate for the bridge with the thickness of 12mm is produced, and the plate blank comprises the following chemical components in percentage by weight: 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 inevitable 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; before rolling the steel plate, the finishing mill replaces a newly ground working roll, and rolls 30 steel plates of other 2930mm wide steel grades before rolling the steel grade; the controlled rolling is carried out after the plate blank is heated, two-stage rolling is adopted, the initial rolling thickness of the first stage is the plate blank 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 the rack is 1.6m/s2The 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 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 is 790 ℃; 7 passes of rolling in the second stage, the last pass is a blank pass, the reduction rates of the 5 th pass and the 6 th pass in the second stage are respectively 16.8 percent and 12 percent, the rolling speed in the second stage is 4.0m/s, the biting speed is 1.8m/s, and the acceleration of the rack is 2.0m/s2When rolling in the second stage, the roll bending force is 1.5MN, the convexity of the steel plate is 40um, a finishing mill adopts a CVC roll, and the idle passing speed of the last pass in the second stage is 2.0 m/s;straightening the steel plate for 3 times by a hot straightening machine after the steel plate is rolled, wherein the final straightening temperature is 510 ℃, and the straightening force is 1200 KN; the final shape of the steel plate is good when the steel plate is produced on a wide and thick plate rolling mill, and the straightness meets the standard requirement.
5. The method for controlling the plate shape of a bridge steel 10-12mm thick steel plate according to claim 1, wherein: the steel plate for the bridge with the thickness of 11mm is produced, and the plate blank comprises the following chemical components in percentage by weight: 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 inevitable 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 plate and 26 plates of other 2950mm wide steel grades were rolled before rolling the grade; the controlled rolling is carried out after the plate blank is heated, two-stage rolling is adopted, the initial rolling thickness of the first stage is the plate blank 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, and the acceleration of the rack is 1.6m/s2The 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 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 is 806 ℃; 7 passes of rolling in the second stage, the last pass is a blank pass, the reduction rates of the 5 th pass and the 6 th pass in the second stage are respectively 16.4 percent and 12.8 percent, the rolling speed in the second stage is 4.5m/s, the biting speed is 1.8m/s, and the acceleration of the rack is 2.0m/s2When rolling in the second stage, the roll bending force is 2.3MN, the convexity of the steel plate is 53um, a finishing mill adopts a CVC roll, and the idle speed of the last pass in the second stage is 2.0 m/s; straightening the steel plate for 3 times by a hot straightening machine after the steel plate is rolled, wherein the final straightening temperature is 536 ℃, and the straightening force is 1852 KN; the final shape of the steel plate is good when the steel plate is produced on a wide and thick plate rolling mill, and the straightness meets the standard requirement.
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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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- 2022-03-21 CN CN202210280107.0A patent/CN114632824B/en active Active
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 |
Non-Patent Citations (1)
| Title |
|---|
| 江定辉: "采用"差动咬入法"控制中厚板轧制板头弯曲", 武汉科技大学学报(自然科学版), no. 03 * |
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