CN115710675A - 500-550 ℃ tempering-resistant softened steel plate and production method thereof - Google Patents
500-550 ℃ tempering-resistant softened steel plate and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 138
- 239000010959 steel Substances 0.000 title claims abstract description 138
- 238000005496 tempering Methods 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims description 125
- 238000001816 cooling Methods 0.000 claims description 39
- 238000010583 slow cooling Methods 0.000 claims description 31
- 230000009467 reduction Effects 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000009749 continuous casting Methods 0.000 claims description 15
- 238000010079 rubber tapping Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 28
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- 230000008569 process Effects 0.000 abstract description 8
- 238000005070 sampling Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 238000009776 industrial production Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
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Abstract
The invention belongs to the field of steel plates, and relates to a steel plate capable of resisting 500-550 ℃ tempering and softening and a production method thereof. The tempering softening resistant steel plate resistant to 500-550 ℃ comprises the following chemical components in percentage by weight: c:0.12 to 0.18%, mn:1.10 to 1.50%, si: 0.20-0.50%, S is less than or equal to 0.010%, P is less than or equal to 0.015%, nb:0.010% -0.050%, V: 0.005-0.050%, ti: 0.005-0.020%, and the balance of Fe and trace impurities. The invention obtains ideal structure performance through the matching of components and processes, thereby enabling the steel plate to have the performance of resisting tempering softening at 500-550 ℃, after the invention is adopted, the steel plate can be subjected to hot straightening at 500-550 ℃ after being welded into a steel pipe, thereby effectively solving the problem that the ovality of the welded steel pipe exceeds standard and is difficult to be straightened. The steel plate produced by the method can be widely applied to industries such as ocean engineering, wind power, high-rise buildings, bridges, pipelines and the like, has strong market competitiveness, and can bring great economic benefits and social benefits to enterprises.
Description
Technical Field
The invention belongs to the field of steel plates, and relates to a 500-550 ℃ tempering-resistant softened steel plate and a production method thereof.
Background
At present, a large number of steel plates are used for pipe coiling and welding, but due to the fact that stress is pure, the problem that the ellipticity of a processed steel pipe exceeds the standard can occur after the steel plates are coiled and welded, the problem that the ellipticity of the steel pipes after pipe coiling forming exceeds the standard is more serious due to the fact that the steel plates with higher strength, in order to guarantee that the ellipticity of the steel pipes after processing and manufacturing meets the standard, the steel pipes after processing and manufacturing need to be subjected to roundness correction, steel pipes made of high-strength steel plates adopt low-temperature roundness correction and are difficult to achieve the roundness correction purpose, so that the steel pipes need to be subjected to appropriate heating and then to be subjected to roundness correction, at present, the steel plates for pipe welding can change in structure property after being heated to a certain temperature, and therefore the strength performance of the processed and molded steel pipes is greatly reduced, the follow-up application performance cannot be guaranteed, and the components fail. If the ovality of the steel pipe exceeds the standard, cold rounding cannot achieve the effect easily, and hot rounding can cause the strength performance of the steel pipe to be reduced and waste products are generated, so that if a tempering-resistant softened steel plate product can be developed, the strength performance problem of the steel pipe subjected to hot rounding can be effectively solved, and the waste products of the steel pipe caused by high hot rounding temperature can be greatly reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a production method of a steel plate capable of resisting 500-550 ℃ tempering and softening. The invention aims to provide a production method of a 500-550 ℃ temper softening resistant steel plate, which obtains ideal structure performance through the matching of components and processes, so that the steel plate has the 500-550 ℃ temper softening resistance performance, and the problems in the background technology are solved. The method of the invention has the advantages of reasonable method, simple production process control, low cost, good effect and stable product quality.
The invention provides a 500-550 ℃ tempering softening resistant steel plate, which comprises the following chemical components in percentage by weight: c:0.12 to 0.18%, mn:1.10 to 1.50%, si: 0.20-0.50%, S is less than or equal to 0.010%, P is less than or equal to 0.015%, nb:0.010% -0.050%, V: 0.005-0.050%, ti: 0.005-0.020%, and the balance of Fe and trace impurities.
Preferably, the 500-550 ℃ tempering and softening resistant steel plate is a hot rolled steel plate with the thickness of 30-60 mm and the width of 1500-4150 mm.
Preferably, the yield strength of the 500-550 ℃ tempering softening resistant steel plate is 350-440MPa, and the tensile strength is 490-600 MP.
The invention provides a production method of a 500-550 ℃ tempering-resistant softened steel plate, which comprises the following steps:
1) Rough rolling: the initial rolling temperature of rough rolling is 1100-1150 ℃, and the final pass temperature of rough rolling is controlled to be 960-1020 ℃;
2) Finish rolling: in the finish rolling stage, 4+3 passes of rolling are adopted, the accumulated reduction of the first 4 passes accounts for 67-77% of the total reduction in the finish rolling stage, after 4 passes of rolling, temperature waiting treatment is carried out, the temperature waiting time is adjusted according to different thicknesses of steel plates, and then finish rolling is carried out for the last 3 passes of rolling;
3) And (3) cooling: and air cooling is carried out after rolling, the steel plate is cooled to 430-450 ℃, the steel plate is discharged to enter a slow cooling pit, and the steel plate is lifted out of the slow cooling pit and cooled to room temperature when the temperature of the steel plate is reduced to below 150 ℃.
According to the invention, through staged rolling in the finish rolling stage and temperature control in the middle process, stress accumulation in the rolling process can be effectively eliminated, and the strict control of the cooling process after rolling is combined, so that the proportion of dislocation strengthening in the steel plate product in the strength performance of the steel plate is reduced, the effects of fine grain strengthening and solid solution strengthening are improved, and the stability of the strength performance of the steel plate after tempering is improved.
As an improvement of the method, in the step 1), the continuous casting billet with the thickness of 250-300 mm is heated and controlled to be 1170-1230 ℃ for 250-400 min.
As an improvement of the method, in the step 1), the tapping temperature is controlled between 1160-1210 ℃.
As an improvement of the method, in the step 1), the rough rolling adopts 4-5 times of rolling, and the thickness of the intermediate billet after the rough rolling is 90-140 mm.
As an improvement of the method, in the step 2), the start rolling temperature of the finish rolling is 900-1000 ℃, the accumulated reduction of the first 4 times accounts for 67-77% of the total reduction of the finish rolling stage, the temperature is kept for 66-200 s after 4 times of rolling, then the last 3 times of rolling are carried out, and the finish rolling temperature is 830-860 ℃.
As an improvement of the method, in the step 3), after the lower line enters the slow cooling pit, a heat preservation cover is covered, the steel plate is slowly cooled to 230-250 ℃, the cover plate is opened, the steel plate is lifted out of the slow cooling pit when the temperature of the steel plate is reduced to below 150 ℃, and the steel plate is cooled to the room temperature.
As an improvement of the method, the reduction values of the yield strength and the tensile strength of the steel plate are less than or equal to 15MPa after the tempering treatment at 500-550 ℃.
Compared with the prior art, the invention has the advantages that:
after the steel plate is welded into the steel pipe, hot rounding at 500-550 ℃ can be carried out, so that the problem that the ovality of the welded steel pipe exceeds the standard and the roundness is difficult to correct is effectively solved. The steel plate produced by the method can be widely applied to industries such as ocean engineering, wind power, high-rise buildings, bridges, pipelines and the like, has strong market competitiveness, and can bring great economic benefits and social benefits to enterprises.
Detailed Description
The present invention will be further described with reference to the following specific examples.
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The invention provides a 500-550 ℃ tempering and softening resistant steel plate, which comprises the following chemical components in percentage by weight: c:0.12 to 0.18%, mn:1.10 to 1.50%, si: 0.20-0.50%, S is less than or equal to 0.010%, P is less than or equal to 0.015%, nb:0.010% -0.050%, V: 0.005-0.050%, ti: 0.005-0.020%, and the balance of Fe and trace impurities. The product is a hot rolled steel plate with the thickness of 30-60 mm and the width of 1500-4150 mm, the yield strength of the steel plate is 350-440MPa, and the tensile strength is 490-600 MP.
The invention provides a production method of a temper softening steel plate resisting 500-550 ℃, which comprises the following steps: heating a continuous casting billet with the thickness of 250-300 mm at 1170-1230 ℃, wherein the heating time is 250-400 min, and the tapping temperature is controlled at 1160-1210 ℃; the initial rolling temperature of rough rolling is 1100-1150 ℃, the final pass temperature of the rough rolling is controlled to be 960-1020 ℃, 4-5 passes of rough rolling are adopted, the thickness of an intermediate blank after the rough rolling is 90-140 mm, the initial rolling temperature of finish rolling is 900-1000 ℃, 4+3 passes of rolling are adopted in the finish rolling stage, the accumulated reduction of the first 4 passes accounts for 67-77% of the total reduction of the finish rolling stage, after 4 passes of rolling, temperature waiting treatment is carried out, the temperature waiting time is 66-200 s, the temperature waiting time is adjusted according to the thickness of steel plates, then the final 3 passes of rolling is carried out, the final rolling temperature is 830-860 ℃, air cooling is carried out after rolling, the steel plates are cooled to 430-450 ℃, the steel plates enter a slow cooling pit after being discharged, a heat preservation cover is covered, the steel plates are slowly cooled to 230-250 ℃, a cover plate is opened, the temperature of the steel plates is reduced to be below 150 ℃, the slow cooling pit is hoisted out, and the steel plates are cooled to the room temperature. The steel plate product produced by the process has the reduction values of the yield strength and the tensile strength of less than or equal to 15MPa after the tempering treatment at the temperature of 500-550 ℃.
Example 1:
industrial production 35mm thick DH36 steel plate for ocean engineering
The steel comprises the following chemical components in percentage by weight: c:0.15%, mn:1.37%, si:0.27%, S:0.004%, P:0.013%, nb:0.029%, V:0.021%, ti:0.012%, the rest is Fe and trace impurities. The steel is cast into a continuous casting slab with the thickness of 250mm by a conventional continuous casting method, the slab is sent to a 4300mm wide and thick plate rolling mill to be rolled into a steel plate with the thickness of 35mm, and the heating, rolling, cooling and slow cooling are precisely controlled.
The production process is controlled as follows:
a. rough rolling:
heating a continuous casting billet with the thickness of 250mm to 1200 ℃, wherein the heating time is 273min, and the tapping temperature is as follows: 1188 deg.C; the initial rolling temperature of rough rolling is 1137 ℃, the rolling is carried out for 4 times, the temperature of the last pass of rough rolling is 995 ℃, and the thickness of the intermediate blank after rough rolling is 103.5mm.
b. Finish rolling
The temperature of the intermediate blank is kept at 257s on a roller way, then finish rolling is started, the initial rolling temperature of finish rolling is 949 ℃, the rolling time of 4 times is 4, the temperature of the intermediate blank is 924 ℃, the accumulated reduction of the first 4 times accounts for 69.3% of the total reduction of the finish rolling stage, then the temperature is kept for 76s, the temperature of the intermediate blank is 885 ℃, the final 3 times of finish rolling is carried out, and the finish rolling temperature is 843 ℃.
C. Cooling down
And air cooling after rolling, cooling to 447 ℃ on a cooling bed, lifting to a slow cooling pit by using an electromagnetic crane, covering a heat-insulating cover, slowly cooling in the slow cooling pit together with other steel plates, slowly cooling the steel plates to 243 ℃, opening a cover plate of the slow cooling pit, cooling the steel plates to 147 ℃, lifting out of the slow cooling pit, and cooling to room temperature. Then sampling and testing, and the yield strength of the steel plate is as follows: 413MPa, tensile strength: 527MPa, elongation after fracture: 27.3 percent.
d. Tempering treatment
Tempering the steel plate at 500 ℃, sampling and inspecting after tempering, wherein the yield strength of the steel plate is as follows: 405MPa, tensile strength: 521MPa, elongation after fracture: 28.7 percent. After 500 ℃ tempering, the yield strength of the steel plate is only reduced by 8MPa, and the tensile strength is only reduced by 6MPa.
Example 2:
industrial production EH36 steel plate with thickness of 50mm for ocean engineering
The steel comprises the following chemical components in percentage by weight: c:0.13%, mn:1.47%, si:0.25%, S:0.002%, P:0.010%, nb:0.031%, V:0.029%, ti:0.014%, the balance being Fe and trace impurities. The steel is cast into a continuous casting slab with the thickness of 250mm by a conventional continuous casting method, the slab is sent to a 4300mm wide and thick plate rolling mill to be rolled into a steel plate with the thickness of 50mm, and the heating, rolling, cooling and slow cooling are precisely controlled.
The production process is controlled as follows:
a. rough rolling:
heating a continuous casting billet with the thickness of 250mm to 1210 ℃, wherein the heating time is 278min, and the tapping temperature is as follows: 1193 deg.C; the initial rolling temperature of rough rolling is 1143 ℃, the rolling time is 4 times, the final temperature of the rough rolling is 990 ℃, and the thickness of the intermediate blank after the rough rolling is 135.5mm.
b. Finish rolling
The intermediate billet is subjected to 293s of temperature on a roller way, then finish rolling is started, the start rolling temperature of finish rolling is 955 ℃, the temperature of the intermediate billet is 931 ℃ and the accumulated reduction of the first 4 passes accounts for 72% of the total reduction of the finish rolling stage, then the temperature is stopped, the time is 105s, the temperature of the intermediate billet is 868 ℃, the final 3 passes of finish rolling are carried out, and the finish rolling temperature is 837 ℃.
C. Cooling
And air cooling after rolling, cooling to 445 ℃ on a cooling bed, hoisting to a slow cooling pit by using an electromagnetic crane, covering a heat-insulating cover, slowly cooling in the slow cooling pit together with other steel plates, slowly cooling the steel plates to 247 ℃, opening a cover plate of the slow cooling pit, cooling the steel plates to 148 ℃, hoisting out of the slow cooling pit, and cooling to room temperature. Then sampling and testing, and the yield strength of the steel plate is as follows: 408MPa, tensile strength: 531MPa, elongation after break: 27.7 percent.
d. Tempering treatment
Tempering the steel plate at 530 ℃, sampling and inspecting after tempering, and testing the yield strength of the steel plate: 399MPa, tensile strength: 527MPa, elongation after fracture: 28.3 percent. After the tempering at 530 ℃, the yield strength is reduced by only 9MPa, and the tensile strength is reduced by 4MPa.
Example 3:
industrial production 60mm thick DH36 steel plate for ocean engineering
The steel comprises the following chemical components in percentage by weight: c:0.16%, mn:1.36%, si:0.30%, S:0.003%, P:0.015%, nb:0.023%, V:0.025%, ti:0.015 percent and the balance of Fe and trace impurities. The steel is cast into a continuous casting slab with the thickness of 300mm by a conventional continuous casting method, the slab is sent to a 4300mm wide and thick plate rolling mill to be rolled into a steel plate with the thickness of 60mm, and the heating, rolling, cooling and slow cooling are accurately controlled.
The production process is controlled as follows:
a. rough rolling:
heating a continuous casting billet with the thickness of 300mm to 1200 ℃, wherein the heating time is 326min, and the tapping temperature is as follows: 1186 deg.C; the initial rolling temperature of rough rolling is 1142 ℃, the rolling time is 4 times, the final temperature of the rough rolling is 979 ℃, and the thickness of the intermediate blank after the rough rolling is 139.5mm.
b. Finish rolling
And (3) allowing the intermediate billet to stand for 297s on a roller way, then starting finish rolling, wherein the start rolling temperature of finish rolling is 961 ℃, the rolling time is 4 times, the temperature of the intermediate billet is 933 ℃, the accumulated reduction of the previous 4 times accounts for 70.5% of the total reduction of the finish rolling stage, then standing for 112s, the temperature of the intermediate billet is 865 ℃, the final 3 times of finish rolling is carried out, and the finish rolling temperature is 839 ℃.
C. Cooling down
And air cooling after rolling, cooling to 449 ℃ on a cooling bed, hoisting to a slow cooling pit by using an electromagnetic crane, covering a heat-insulating cover, slowly cooling together with other steel plates in the slow cooling pit, slowly cooling the steel plates to 243 ℃, opening a cover plate of the slow cooling pit, cooling the steel plates to 146 ℃, hoisting out of the slow cooling pit, and cooling to room temperature. Then sampling and testing, and the yield strength of the steel plate: 421Mpa, tensile strength: 545MPa, elongation after fracture: 25.2 percent.
d. Tempering treatment
Tempering the steel plate at 550 ℃, sampling and inspecting after tempering, and testing the yield strength of the steel plate: 414MPa, tensile strength: 538MPa, elongation after fracture: 28.6 percent. After tempering at 550 ℃, the yield strength is reduced by only 7MPa, and the tensile strength is reduced by 7MPa.
Example 4:
industrially produced steel plate with thickness of 60mm for S355NL ocean wind power
The steel comprises the following chemical components in percentage by weight: c:0.15%, mn:1.43%, si:0.28%, S:0.001%, P:0.009%, nb:0.026%, V:0.032%, ti:0.013%, and the balance of Fe and trace impurities. The steel is cast into a continuous casting slab with the thickness of 300mm by a conventional continuous casting method, the slab is sent to a 4300mm wide and thick plate rolling mill to be rolled into a steel plate with the thickness of 60mm, and the heating, rolling, cooling and slow cooling are accurately controlled.
The production process is controlled as follows:
a. rough rolling:
heating a continuous casting billet with the thickness of 300mm to 1207 ℃, wherein the heating time is 332min, and the tapping temperature is as follows: 1191 deg.C; the initial rolling temperature of rough rolling is 1139 ℃, the rolling time is 4 times, the final time temperature of the rough rolling is 986 ℃, and the thickness of the intermediate blank after the rough rolling is 139.5mm.
b. Finish rolling
And (2) allowing the intermediate blank to stand for 295s on a roller way, then, starting finish rolling, wherein the start rolling temperature of finish rolling is 958 ℃, the rolling time of 4 times is 930 ℃, the accumulated reduction of the first 4 times accounts for 74.2% of the total reduction of the finish rolling stage, then, standing for 109s, the temperature of the intermediate blank is 866 ℃, the final 3 times of finish rolling is carried out, and the finish rolling temperature is 841 ℃.
C. Cooling down
And air cooling after rolling, cooling to 447 ℃ on a cooling bed, lifting to a slow cooling pit by using an electromagnetic crane, covering a heat-insulating cover, slowly cooling in the slow cooling pit together with other steel plates, slowly cooling the steel plates to 248 ℃, opening a cover plate of the slow cooling pit, cooling the steel plates to 146 ℃, lifting out of the slow cooling pit, and cooling to room temperature. Then sampling and testing, and the yield strength of the steel plate: 399MPa, tensile strength: 538MPa, elongation after fracture: 29.6 percent.
d. Tempering treatment
Tempering the steel plate at 550 ℃, sampling and inspecting after tempering, wherein the yield strength of the steel plate is as follows: 392MPa, tensile strength: 533MPa, elongation after fracture: 28.9 percent. After tempering at 550 ℃, the yield strength is reduced by only 7MPa, and the tensile strength is reduced by 5MPa.
The implementation effect of the invention is as follows:
after the 500-550 ℃ tempering-resistant softened steel plate produced by the method is tempered at 500-550 ℃, the yield strength and the tensile strength drop value are within 10MPa, and the tempering-resistant softened effect is obvious. The following table shows the comparison of strength performance reduction of steel plates produced by conventional processes and steel plates produced by the method after tempering at 500-550 ℃.
TABLE 1 comparison of strength and performance reduction after 500-550 ℃ tempering of steel plates produced by different processes
As is clear from the table: after the method is adopted, the tempering softening resistance of the produced steel plate is obviously improved, and after the steel plate is tempered at 500-550 ℃, the strength performance attenuation value is reduced to be less than or equal to 10MPa from more than or equal to 50MPa under the conventional process condition. The method of the invention has the advantages of reasonableness, simple control of production process, low cost and good effect, the steel plate product has the performance of resisting the tempering softening at 500-550 ℃, the strength performance reduction value of the steel plate is less than or equal to 15Mpa after the tempering treatment at 500-550 ℃, and the product quality is stable.
After the method is adopted, after the steel plate is welded into the steel pipe, the hot rounding at 500-550 ℃ can be carried out, thereby effectively solving the problem that the ovality of the welded steel pipe exceeds standard but is difficult to round. The steel plate produced by the method can be widely applied to industries such as ocean engineering, wind power, high-rise buildings, bridges, pipelines and the like, has strong market competitiveness, and can bring great economic benefits and social benefits to enterprises.
Those skilled in the art will recognize that the invention may be practiced without these specific details.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The 500-550 ℃ tempering softening resistant steel plate is characterized by comprising the following chemical components in percentage by weight: c:0.12 to 0.18%, mn:1.10 to 1.50%, si: 0.20-0.50%, S is less than or equal to 0.010%, P is less than or equal to 0.015%, nb:0.010% -0.050%, V: 0.005-0.050%, ti: 0.005-0.020%, and the balance of Fe and trace impurities.
2. The 500 ℃ -550 ℃ temper softening resistant steel sheet according to claim 1, wherein the 500 ℃ -550 ℃ temper softening resistant steel sheet is a hot rolled steel sheet having a thickness of 30 mm-60 mm and a width of 1500 mm-4150 mm.
3. The temper softening steel plate of 500-550 ℃ resistant according to claim 1, wherein the yield strength of the temper softening steel plate of 500-550 ℃ resistant is 350-440MPa, and the tensile strength is 490-600 MPa.
4. A method for producing a 500 ℃ -550 ℃ temper softening resistant steel plate based on any one of claims 1-3, comprising the following steps:
1) Rough rolling: the initial rolling temperature of rough rolling is 1100-1150 ℃, and the final pass temperature of rough rolling is controlled to be 960-1020 ℃;
2) Finish rolling: in the finish rolling stage, 4+3 passes of rolling are adopted, the accumulated reduction of the first 4 passes accounts for 67-77% of the total reduction in the finish rolling stage, after 4 passes of rolling, temperature treatment is carried out, and then finish rolling is carried out for the last 3 passes of rolling;
3) And (3) cooling: and (3) air cooling is carried out after rolling, the steel plate is cooled to 430-450 ℃, the steel plate is discharged to enter a slow cooling pit, and after the slow cooling is finished, the steel plate is lifted out of the slow cooling pit and is cooled to room temperature.
5. The method for producing the temper softening steel plate resistant to 500-550 ℃ according to the claim 1, wherein in the step 1), the heating time of the continuous casting billet with the thickness of 250-300 mm is controlled to be 1170-1230 ℃ for 250-400 min.
6. The method for producing a tempered and softened steel sheet resistant to 500 ℃ -550 ℃ according to claim 1, wherein in the step 1), the tapping temperature is controlled to be 1160 ℃ -1210 ℃.
7. The method for producing the 500 ℃ to 550 ℃ temper softening resistant steel plate according to the claim 1, wherein in the step 1), the rough rolling adopts 4 to 5 passes of rolling, and the thickness of the intermediate blank after the rough rolling is 90 to 140mm.
8. The method for producing the temper softening resistant steel plate of 500-550 ℃ according to claim 1, wherein in the step 2), the temperature of the finish rolling is between 900 and 1000 ℃, the temperature is kept for 66-200 s after 4 passes of rolling, then the final 3 passes of rolling are carried out, and the temperature of the final rolling is between 830 and 860 ℃.
9. The method for producing the 500 ℃ -550 ℃ temper softening resistant steel plate according to claim 1, wherein in the step 3), after the lower line enters the slow cooling pit, a heat preservation cover is covered, the steel plate is slowly cooled to 230-250 ℃, a cover plate is opened for cooling, the temperature of the steel plate is reduced to below 150 ℃, the steel plate is lifted out of the slow cooling pit and cooled to room temperature.
10. The method for producing the 500 ℃ -550 ℃ temper softening resistant steel plate according to claim 1, wherein the reduction values of the yield strength and the tensile strength of the steel plate are less than or equal to 15MPa after the 500 ℃ -550 ℃ tempering treatment.
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| CN112981235A (en) * | 2021-01-22 | 2021-06-18 | 江阴兴澄特种钢铁有限公司 | Hardened and tempered steel plate with yield strength of 420MPa grade for building structure and production method thereof |
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