CN115710675B - Anti-500-550 ℃ tempering softened steel plate and production method thereof - Google Patents
Anti-500-550 ℃ tempering softened steel plate and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 135
- 239000010959 steel Substances 0.000 title claims abstract description 135
- 238000005496 tempering Methods 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 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 141
- 238000001816 cooling Methods 0.000 claims description 40
- 238000010583 slow cooling Methods 0.000 claims description 29
- 230000009467 reduction Effects 0.000 claims description 20
- 238000009749 continuous casting Methods 0.000 claims description 16
- 238000004321 preservation Methods 0.000 claims description 7
- 238000010079 rubber tapping Methods 0.000 claims description 6
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- 238000000034 method Methods 0.000 description 22
- 238000010438 heat treatment Methods 0.000 description 14
- 238000005070 sampling Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 238000009776 industrial production Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
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- 239000002699 waste material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The application belongs to the field of steel plates, and relates to a tempering softening steel plate resistant to 500-550 ℃ and a production method thereof. The anti-500-550 ℃ tempering and softening steel plate comprises the following chemical components in percentage by weight: c:0.12 to 0.18 percent of Mn:1.10 to 1.50 percent of Si:0.20 to 0.50 percent, S is less than or equal to 0.010 percent, P is less than or equal to 0.015 percent, nb:0.010% -0.050%, V:0.005% -0.050%, ti: 0.005-0.020%, and the balance of Fe and trace impurities. The application effectively solves the problems that the ellipticity of the welded steel pipe exceeds the standard and the roundness is difficult to correct. The steel plate produced by the application 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 and social benefits to enterprises.
Description
Technical Field
The application belongs to the field of steel plates, and relates to a temper softening steel plate resistant to 500-550 ℃ and a production method thereof.
Background
At present, a large number of steel plates are used for coiling and welding, but because the stress is pure, the problem that the ovality of a processed steel pipe exceeds standard after the steel plates are coiled and welded, and the higher the strength is, the more serious the ovality exceeds standard after the coiling and forming is, in order to ensure that the ovality of the processed and manufactured steel pipe meets the standard, the processed and formed steel pipe is required to be subjected to rounding treatment subsequently, and the steel pipe manufactured by the high-strength steel plate is difficult to achieve the purpose of rounding by adopting low-temperature rounding, so that the steel pipe is required to be properly heated and then rounded, but the structural property of the steel plate for the welded pipe is changed after the steel plate is heated to a certain temperature at present, so that the strength property of the processed and formed steel pipe is greatly reduced, the subsequent application property cannot be ensured, and the component is invalid. The common steel plate is welded into the steel pipe, if the ovality of the steel pipe exceeds the standard, the cold rounding is difficult to achieve the effect, and the hot rounding can lead to the reduction of the strength performance of the steel pipe and generate waste products, so that if a tempering-resistant softened steel plate product can be developed, the strength performance problem of the processed and formed steel pipe after the hot rounding can be effectively solved, and the waste products of the steel pipe caused by higher hot rounding temperature are greatly reduced.
Disclosure of Invention
The application provides a production method of a temper softening steel plate capable of resisting 500-550 ℃ aiming at the defects of the prior art. The application aims to provide a production method of a steel plate resistant to tempering and softening at 500-550 ℃, and ideal tissue performance is obtained through the matching of components and processes, so that the steel plate has the property of resisting tempering and softening at 500-550 ℃, and the problems in the background technology are solved. The method is reasonable, the production process is simple to control, the cost is low, the effect is good, and the product quality is stable.
The application provides a steel plate resistant to tempering and softening at 500-550 ℃, which comprises the following chemical components in percentage by weight: c:0.12 to 0.18 percent of Mn:1.10 to 1.50 percent of Si:0.20 to 0.50 percent, S is less than or equal to 0.010 percent, P is less than or equal to 0.015 percent, 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 tempering and softening resistant steel plate with the temperature of 500-550 ℃ 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 tempering-softened steel plate resistant to 500-550 ℃ is 350-440MPa, and the tensile strength is 490-600 MP.
The application provides a production method of a temper softening steel plate resistant to 500-550 ℃, which comprises the following steps:
1) Rough rolling: the initial rolling temperature of rough rolling is between 1100 and 1150 ℃, and the final pass temperature of rough rolling is controlled between 960 and 1020 ℃;
2) Finish rolling: the finish rolling stage adopts 4+3 times of rolling, the accumulated rolling reduction of the first 4 times accounts for 67-77% of the total rolling reduction of the finish rolling stage, after 4 times of rolling, the temperature treatment is carried out, the temperature treatment time is adjusted according to the thickness of the steel plate, and then the finish rolling is carried out for the last 3 times of rolling;
3) And (3) cooling: cooling the steel plate to 430-450 ℃ in an air cooling way after rolling, entering a slow cooling pit in a descending line, cooling the steel plate to below 150 ℃, lifting the steel plate out of the slow cooling pit, and cooling to room temperature.
According to the application, through stage 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 reinforcement in the steel plate product in the strength performance of the steel plate is reduced, the effects of fine grain reinforcement and solid solution reinforcement 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 heating of the continuous casting billet with the thickness of 250-300 mm is controlled between 1170 ℃ and 1230 ℃ for 250-400 min.
As a modification of the above method, in the step 1), the tapping temperature is controlled between 1160 ℃ and 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 rough rolling is 90-140 mm.
As an improvement of the method, in the step 2), the initial rolling temperature of finish rolling is 900-1000 ℃, the accumulated rolling reduction of the first 4 passes accounts for 67-77% of the total rolling reduction of the finish rolling stage, 4 passes are rolled, the temperature is kept for 66-200 s, then the final 3 passes are carried out, and the final rolling temperature is 830-860 ℃.
As an improvement of the method, in the step 3), after entering the slow cooling pit, a heat preservation cover is covered, the steel plate is slowly cooled to 230-250 ℃, a cover plate is opened, the temperature of the steel plate is reduced to below 150 ℃, the slow cooling pit is lifted out, and the steel plate is cooled to room temperature.
As an improvement of the method, after tempering treatment at 500-550 ℃, the yield strength and tensile strength reduction value of the steel plate are less than or equal to 15MPa.
Compared with the prior art, the application has the advantages that:
the common steel plate is welded into a steel pipe, if the ovality of the steel pipe exceeds the standard, the cold rounding is difficult to achieve, the hot rounding can reduce the strength performance of the steel pipe and produce waste products, after the steel plate is welded into the steel pipe, the hot rounding at 500-550 ℃ can be carried out, so that the problems that the ovality of the welded steel pipe exceeds the standard and the rounding is difficult to be rectified are effectively solved. The steel plate produced by the application 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 and social benefits to enterprises.
Detailed Description
The application will be further illustrated with reference to specific examples.
In order to better understand the technical solutions of the present application for those skilled in the art, the following description of the technical solutions of the embodiments of the present application will be clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
The application provides a tempering softening resistant steel plate at 500-550 ℃, which comprises the following chemical components in percentage by weight: c:0.12 to 0.18 percent of Mn:1.10 to 1.50 percent of Si:0.20 to 0.50 percent, S is less than or equal to 0.010 percent, P is less than or equal to 0.015 percent, 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 application provides a production method of a temper softening steel plate resistant to 500-550 ℃, which comprises the following steps: heating the continuous casting billet with the thickness of 250-300 mm to 1170-1230 ℃, heating for 250-400 min, and controlling the tapping temperature to 1160-1210 ℃; the initial rolling temperature of rough rolling is between 1100 and 1150 ℃, the final rolling temperature of rough rolling is controlled between 960 and 1020 ℃, the thickness of an intermediate billet after rough rolling is between 90 and 140mm, the initial rolling temperature of finish rolling is between 900 and 1000 ℃, the finish rolling stage is 4+3 rolling, the accumulated rolling reduction of the first 4 passes accounts for 67 to 77 percent of the total rolling reduction of the finish rolling stage, after 4 rolling, the temperature treatment is carried out, the temperature treatment time is between 66 and 200 seconds, the temperature treatment time is regulated according to the thickness difference of the steel plate, then the final rolling is carried out for 3 times, the final rolling temperature is between 830 and 860 ℃, the steel plate is cooled to 430 to 450 ℃, the lower line enters a slow cooling pit, a heat preservation cover is covered, the steel plate is slowly cooled to 230 to 250 ℃, the temperature of the steel plate is opened, the temperature of the steel plate is reduced to below 150 ℃, the slow cooling pit is hung, and the temperature is cooled to the room temperature. The steel plate product produced by the process is tempered at 500-550 ℃ and the yield strength and tensile strength of the steel plate are reduced by less than or equal to 15MPa.
Example 1:
industrial production steel plate with thickness of 35mm for DH36 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 percent of Fe and trace impurities. Casting steel into a continuous casting slab with the thickness of 250mm by a conventional continuous casting method, conveying the slab to a 4300mm wide and thick plate rolling mill for rolling into a 35mm thick steel plate, and precisely controlling heating, rolling, cooling and slow cooling.
The production process is controlled as follows:
a. rough rolling:
heating a 250mm thick continuous casting blank to 1200 ℃, wherein the heating time is 273min, and the tapping temperature is as follows: 1188 ℃; the initial rolling temperature of rough rolling is 1137 ℃, the rolling is carried out for 4 times, the final rolling temperature is 995 ℃, and the thickness of the intermediate blank after rough rolling is 103.5mm.
b. Finish rolling
The intermediate billet is heated on a roller way for 257s, then finish rolling is started, the initial rolling temperature of finish rolling is 949 ℃, 4 passes are rolled, the temperature of the intermediate billet is 924 ℃, the accumulated rolling reduction of the first 4 passes accounts for 69.3% of the total rolling reduction of the finish rolling stage, then the intermediate billet is heated for 76s, the temperature of the intermediate billet is 885 ℃, the final 3 passes of finish rolling are carried out, and the final rolling temperature of finish rolling is 843 ℃.
C. Cooling
Cooling in air after rolling, cooling to 447 ℃, lifting to a slow cooling pit by using an electromagnetic crane, covering a heat preservation cover, slowly cooling together with other steel plates in the slow cooling pit, slowly cooling the steel plates to 243 ℃, opening a slow cooling pit cover plate, cooling the steel plates to 147 ℃, lifting out of the slow cooling pit, and cooling to room temperature. And then sampling and testing, wherein the yield strength of the steel plate is as follows: 413MPa, tensile strength: 527MPa, elongation after break: 27.3%.
d. Tempering treatment
Tempering the steel plate at 500 ℃, sampling and testing after tempering, wherein the yield strength of the steel plate is as follows: 405MPa, tensile strength: 521MPa, elongation after break: 28.7%. After tempering at 500 ℃, 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 50mm thick EH36 steel plate 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%, and the balance of Fe and trace impurities. Casting steel into a continuous casting slab with the thickness of 250mm by a conventional continuous casting method, conveying the slab to a 4300mm wide and thick plate rolling mill for rolling into a 50mm thick steel plate, and precisely controlling heating, rolling, cooling and slow cooling.
The production process is controlled as follows:
a. rough rolling:
heating a 250mm thick continuous casting blank to 1210 ℃, heating time 278min, and tapping temperature: 1193 ℃; the initial rolling temperature of rough rolling is 1143 ℃, the rolling is carried out for 4 times, the final rolling temperature is 990 ℃, and the thickness of the rough rolled intermediate blank is 135.5mm.
b. Finish rolling
The intermediate billet is heated for 293s on a roller way, then finish rolling is started, the finish rolling start temperature is 955 ℃, the rolling is carried out for 4 times, the intermediate billet temperature is 931 ℃, the accumulated rolling reduction of the first 4 times accounts for 72 percent of the total rolling reduction of the finish rolling stage, then the intermediate billet temperature is heated for 105s, the intermediate billet temperature is 868 ℃, the finish rolling is carried out for the last 3 times, and the finish rolling temperature is 837 ℃.
C. Cooling
Cooling in air after rolling, cooling to 445 ℃, lifting to a slow cooling pit by using an electromagnetic crane, covering a heat preservation cover, slowly cooling together with other steel plates in the slow cooling pit, slowly cooling the steel plates to 247 ℃, opening a cover plate of the slow cooling pit, cooling the steel plates to 148 ℃, lifting out of the slow cooling pit, and cooling to room temperature. And then sampling and testing, wherein the yield strength of the steel plate is as follows: 408MPa, tensile strength: 531MPa, elongation after break: 27.7%.
d. Tempering treatment
Tempering the steel plate at 530 ℃, sampling and testing after tempering, wherein the yield strength of the steel plate is as follows: 399MPa, tensile strength: 527MPa, elongation after break: 28.3%. After tempering at 530 ℃, the yield strength is reduced by only 9MPa, and the tensile strength is reduced by 4MPa.
Example 3:
industrially produced 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 of Fe and trace impurities. Casting steel into a continuous casting slab with the thickness of 300mm by a conventional continuous casting method, conveying the slab to a 4300mm wide and thick plate rolling mill for rolling into a 60mm thick steel plate, and precisely controlling heating, rolling, cooling and slow cooling.
The production process is controlled as follows:
a. rough rolling:
heating a 300mm thick continuous casting blank to 1200 ℃, wherein the heating time is 326min, and the tapping temperature is as follows: 1186 ℃; the initial rolling temperature of rough rolling is 1142 ℃, the rolling is carried out for 4 times, the final rolling temperature is 979 ℃, and the thickness of the intermediate blank after rough rolling is 139.5mm.
b. Finish rolling
The intermediate billet is heated to 297s on a roller way, then finish rolling is started, the initial rolling temperature of finish rolling is 961 ℃, rolling is carried out for 4 times, the accumulated rolling reduction of the first 4 times accounts for 70.5% of the total rolling reduction of the finish rolling stage, then the intermediate billet is heated for 112s, the temperature of the intermediate billet is 865 ℃, the final rolling of the finish rolling is carried out for 3 times, and the final rolling temperature of finish rolling is 839 ℃.
C. Cooling
Cooling in air after rolling, cooling to 449 ℃, lifting to a slow cooling pit by using an electromagnetic crane, covering a heat preservation cover, slowly cooling together with other steel plates in the slow cooling pit, slowly cooling the steel plates to 243 ℃, opening a slow cooling pit cover plate, cooling the steel plates to 146 ℃, lifting out of the slow cooling pit, and cooling to room temperature. And then sampling and testing, wherein the yield strength of the steel plate is as follows: 421Mpa, tensile strength: 545MPa, elongation after break: 25.2%.
d. Tempering treatment
And (3) tempering the steel plate at 550 ℃, sampling and testing after tempering, wherein the yield strength of the steel plate is as follows: 414MPa, tensile strength: 538MPa, elongation after break: 28.6%. After tempering at 550 ℃, the yield strength is reduced by only 7MPa, and the tensile strength is reduced by 7MPa.
Example 4:
industrial production 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. Casting steel into a continuous casting slab with the thickness of 300mm by a conventional continuous casting method, conveying the slab to a 4300mm wide and thick plate rolling mill for rolling into a 60mm thick steel plate, and precisely controlling heating, rolling, cooling and slow cooling.
The production process is controlled as follows:
a. rough rolling:
heating a 300mm thick continuous casting blank to 1207 ℃ for 332min, and discharging the continuous casting blank at the temperature: 1191 ℃; the initial rolling temperature of rough rolling is 1139 ℃, the rolling is carried out for 4 times, the final rolling temperature is 986 ℃, and the thickness of the intermediate blank after rough rolling is 139.5mm.
b. Finish rolling
The intermediate billet is heated on a roller way for 295s, then finish rolling is started, the initial rolling temperature of finish rolling is 958 ℃, 4 passes are rolled, the temperature of the intermediate billet is 930 ℃, the accumulated rolling reduction of the first 4 passes accounts for 74.2% of the total rolling reduction of the finish rolling stage, then the intermediate billet is heated for 109s, the temperature of the intermediate billet is 866 ℃, the final 3 passes of finish rolling are carried out, and the final rolling temperature of finish rolling is 841 ℃.
C. Cooling
Cooling in air after rolling, cooling to 447 ℃, lifting to a slow cooling pit by using an electromagnetic crane, covering a heat preservation cover, slowly cooling together with other steel plates in the slow cooling pit, slowly cooling the steel plates to 248 ℃, opening a slow cooling pit cover plate, cooling the steel plates to 146 ℃, lifting out of the slow cooling pit, and cooling to room temperature. And then sampling and testing, wherein the yield strength of the steel plate is as follows: 399MPa, tensile strength: 538MPa, elongation after break: 29.6%.
d. Tempering treatment
And (3) tempering the steel plate at 550 ℃, sampling and testing after tempering, wherein the yield strength of the steel plate is as follows: 392MPa, tensile strength: 533MPa, elongation after break: 28.9%. 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 application is as follows:
the steel plate with the tempering softening resistance of 500-550 ℃ produced by the method has the yield strength and tensile strength reduced values within 10MPa after the tempering treatment of 500-550 ℃, and has remarkable tempering softening resistance effect. The following table shows the comparison of strength performance reduction after tempering at 500-550 ℃ of steel plates produced by conventional processes and steel plates produced by the method.
Table 1 comparison of strength performance degradation after tempering at 500-550 ℃ for steel sheets produced by different processes
It can be clearly seen from the table: after the method is adopted, the tempering and softening resistance of the produced steel plate is obviously improved, and after tempering at 500-550 ℃, the strength performance attenuation value is reduced from more than or equal to 50MPa to less than or equal to 10MPa under the conventional process condition. The method is reasonable, the production process is simple to control, the cost is low, the effect is good, the steel plate product has the property of resisting tempering softening at 500-550 ℃, the strength performance reduction value of the steel plate is less than or equal to 15Mpa after tempering treatment at 500-550 ℃, and the product quality is stable.
After the steel plate is welded into the steel pipe, the hot rounding at 500-550 ℃ can be carried out, so that the problems that the ovality of the welded steel pipe exceeds the standard and the rounding is difficult to be rectified are effectively solved. The steel plate produced by the application 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 and social benefits to enterprises.
The application may be practiced without these specific details, using any knowledge known in the art.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present application and are not limiting. Although the present application has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present application, which is intended to be covered by the appended claims.
Claims (7)
1. The anti-500-550 ℃ tempering and softening steel plate is characterized by comprising the following chemical components in percentage by weight: c:0.12 to 0.18 percent of Mn:1.10 to 1.50 percent of Si:0.20 to 0.50 percent, S is less than or equal to 0.010 percent, P is less than or equal to 0.015 percent, nb:0.010% -0.050%, V:0.005% -0.050%, ti: 0.005-0.020%, and the balance of Fe and trace impurities;
the production method of the tempering and softening resistant steel plate at 500-550 ℃ comprises the following steps:
1) Rough rolling: the initial rolling temperature of rough rolling is between 1100 and 1150 ℃, and the final pass temperature of rough rolling is controlled between 960 and 1020 ℃;
2) Finish rolling: the finish rolling stage adopts 4+3 times of rolling, the accumulated rolling reduction of the first 4 times accounts for 67-77% of the total rolling reduction of the finish rolling stage, after 4 times of rolling, the temperature treatment is carried out, and then the finish rolling is carried out, and finally the 3 times of rolling are carried out; wherein the initial rolling temperature of the finish rolling is 900-1000 ℃, the waiting time is 66-200 s, and the final rolling temperature is 830-860 ℃;
3) And (3) cooling: cooling the steel plate to 430-450 ℃ after rolling, taking off the steel plate into a slow cooling pit, covering a heat preservation cover after taking off the steel plate into the slow cooling pit, slowly cooling the steel plate to 230-250 ℃, opening a cover plate for cooling, cooling the steel plate to below 150 ℃, lifting the steel plate out of the slow cooling pit, and cooling to room temperature.
2. The temper-softened steel sheet resistant to 500-550 ℃ according to claim 1, wherein the temper-softened steel sheet resistant to 500-550 ℃ is a hot rolled steel sheet having a thickness of 30-60 mm and a width of 1500-4150 mm.
3. The temper softened steel sheet resistant to 500-550 ℃ according to claim 1, wherein the yield strength of the temper softened steel sheet resistant to 500-550 ℃ is between 350-440MPa and the tensile strength is between 490-600 MPa.
4. The temper softening resistant steel sheet of claim 1, wherein in step 1), the continuous casting slab of 250-300 mm thickness is heated to 1170-1230 ℃ for 250-400 min.
5. The temper softening steel sheet resistant to 500-550 ℃ as set forth in claim 1, wherein in step 1), the tapping temperature is controlled to be 1160-1210 ℃.
6. The temper softening resistant steel sheet of claim 1, wherein in step 1), the rough rolling is performed in 4 to 5 passes, and the thickness of the intermediate billet after the rough rolling is 90 to 140mm.
7. The temper softening resistant steel sheet of claim 1, wherein the yield strength and tensile strength of the steel sheet after the tempering treatment at 500-550 ℃ are less than or equal to 15MPa.
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