CN115772634A - Cr-containing normalized steel plate for nuclear power and manufacturing method thereof - Google Patents
Cr-containing normalized steel plate for nuclear power and manufacturing method thereof Download PDFInfo
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- 238000005260 corrosion Methods 0.000 claims abstract description 15
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Abstract
The invention discloses a Cr-containing normalized steel plate for nuclear power and a manufacturing method thereof, wherein the Cr-containing normalized steel plate for nuclear power comprises the following chemical components in percentage by weight: c:0.17 to 0.20%, si:0.15 to 0.35%, mn:1.10 to 1.20%, nb: 0.010-0.020%, cr:0.21 to 0.26%, als:0.015 to 0.045%, ti: 0.010-0.020%, CEV less than or equal to 0.43%, and the balanceFe and inevitable impurities; the invention produces the SA516Gr.70 steel plate with the thickness of 12-75 mm by strictly controlling the content of Mn and adding chromium and niobium, and the steel plate has the transverse impact value at-40 ℃ of more than 80J, the yield strength of 320-360MPa, the tensile strength of 500-535MPa, the elongation of more than 28 percent and the corrosion resistance rate of not more than 1.0g/m 2 H, excellent corrosion resistance and normal-temperature and low-temperature mechanical properties.
Description
Technical Field
The invention belongs to the technical field of steel, and particularly relates to a Cr-containing normalized steel plate for nuclear power and a manufacturing method thereof.
Background
In order to realize sustainable development, energy conservation and emission reduction must be accelerated, clean energy must be developed vigorously, and national economy is guaranteed to develop rapidly and well. The practice of nuclear power technology development and operation in the world proves that nuclear energy has the advantages of cleanness, safety and capability of providing stable electric power in a large scale, and is increasingly favored.
The auxiliary machine of the nuclear power station is an auxiliary machine of power station production equipment, is an important component of the power station equipment, is indispensable equipment for normal operation of the power station equipment, and has a value amount that a main machine and the auxiliary machine respectively account for half of equipment investment, so that the auxiliary machine of the power station occupies a very important position. The auxiliary equipment of the power station except the main machine is an auxiliary machine, the related doors are numerous, the manufacturing difficulty of the auxiliary equipment is high, and the reliability requirement is high.
Auxiliary equipment of nuclear power plants, such as sewage disposal equipment and seawater filtration equipment, needs to be resistant to seawater corrosion, the corrosion rate is not more than 1.5g/m < 2 >. H, and the low-temperature toughness of steel plates is good. Chinese patent CN102703831A discloses a Cu-containing Cr-controlled seamless steel tube for a nuclear power plant and a production method thereof, and the seamless steel tube is made of the following materials in percentage by mass: c:0.10 to 0.15; mn:0.90 to 1.20; si:0.20 to 0.45; p is less than or equal to 0.015; s is less than or equal to 0.005; cr:0.20 to 0.30; mo:0.25 to 0.40; ni:1.10 to 1.25; cu:0.55 to 0.65; nb:0.015 to 0.025; al (Al) tot Less than or equal to 0.02; n is less than or equal to 0.008; h is less than or equal to 0.0002; o is less than or equal to 0.003; as + Sn is less than or equal to 0.012, as + Sn + Pb + Sb + Bi is less than or equal to 0.020, and the balance is Fe and inevitable impurities; it adds Cu, cr and other alloy elements, strictly controls harmful elements, obtains high-purity, low-gas and low-impurity round billet, and makes reasonable heating system, rolling process and heat treatment system to make steelThe alloy has much higher strength and excellent anti-FAC performance than carbon steel; however, the patent does not pay attention to the corrosion resistance of the seamless steel pipe for the nuclear power plant containing Cu and Cr, and the prior art does not disclose a corrosion-resistant steel plate applied to the auxiliary equipment of the nuclear power plant.
Disclosure of Invention
The invention aims to provide a Cr-containing normalized steel plate for nuclear power and a manufacturing method thereof, wherein the Cr-containing normalized steel plate has excellent corrosion resistance and normal-temperature and low-temperature mechanical properties.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the steel plate for the Cr-containing normalized nuclear power comprises the following chemical components in percentage by weight: c:0.17 to 0.20%, si:0.15 to 0.35%, mn:1.10 to 1.20%, P: less than or equal to 0.018 percent, less than or equal to 0.005 percent of S, nb: 0.010-0.020%, cr:0.21 to 0.26%, als:0.015 to 0.045%, ti: 0.010-0.020%, CEV less than or equal to 0.43%, and the balance of Fe and inevitable impurities.
The metallographic structure of the Cr-containing normalized nuclear power steel plate is ferrite plus pearlite, the grain size is 9.0 grade, and the banded structure is 0.5 grade.
The Cr-containing normalized nuclear power steel plate has the yield strength of 320-360MPa, the tensile strength of 500-535MPa, the elongation A of more than or equal to 28 percent, the average value of transverse V-shaped impact absorption energy at minus 40 ℃ of more than or equal to 80J, and the corrosion resistance rate of less than or equal to 1.0g/m 2 ·h。
The invention also provides a manufacturing method of the Cr-containing normalized steel plate for nuclear power, which comprises the following steps: converter smelting, LF refining, RH vacuum refining, continuous casting, hot rolling and heat treatment.
In the LF refining step, white slag operation is performed, the white slag retention time is more than 20min, and S is controlled to be less than or equal to 0.005%, so that the purity of molten steel is improved, and the low-temperature toughness of steel is improved.
In the RH vacuum refining step, the vacuum degree is required to be less than or equal to 133Pa, the vacuum maintaining time is more than or equal to 15min, the H content is less than or equal to 1.5ppm, the hydrogen-induced cracks at the center of the steel plate are reduced, and the flaw detection level of the steel plate is improved.
In the continuous casting step, the superheat degree is controlled within the range of 10-30 ℃, the constant drawing speed operation is carried out, and the fluctuation of the liquid level of the crystallizer is within the range of +/-3 mm; and after continuous casting, blank cleaning is carried out, the corner and the surface of the blank are cleaned, and surface cracks and corner cracks are avoided.
In the hot rolling step, the temperature of a blank preheating section is 700-900 ℃, the temperature of a first adding section is 1100-1200 ℃, the temperature of a second adding section is 1200-1250 ℃, the soaking temperature is 1200-1240 ℃, the furnace time (1.0-1.2) multiplied by H minutes, H is the thickness of a plate blank, and the unit is mm; and rolling after reaching the temperature.
In the hot rolling step, two-stage rolling is adopted, and the initial rolling temperature of rough rolling is more than 1000 ℃; the initial rolling temperature of the finish rolling is less than or equal to 950 ℃, the finishing temperature is 820-860 ℃, and the steel is cooled in air after rolling. Deformation is carried out above the recrystallization temperature, complete recrystallization is carried out, austenite grains are refined, and strain induction is separated out at the final rolling temperature of about 850 ℃ of the dynamic recrystallization temperature to prevent the austenite grains from growing.
In the hot rolling step, the reduction rate of a rough rolling pass is more than 12 percent; the accumulated deformation rate of finish rolling is more than 50 percent.
The heat treatment is normalizing treatment.
Calculated by empirical formula, the AC of the steel 3 At a temperature of about 840 ℃ slightly above AC 3 The steel plate can be ensured to obtain good obdurability by temperature normalizing. In the heat treatment step, for a steel plate with the thickness of less than or equal to 15mm, the normalizing temperature is 860 +/-10 ℃, the furnace time is 4 XH minutes, H is the thickness of the steel plate, and the unit is mm; air cooling after discharging the normalizing furnace; for a steel plate with the thickness of more than 15mm and less than or equal to 75mm, the normalizing temperature is 865 +/-10 ℃, the furnace time is 2.2 XH minutes, and H is the thickness of the steel plate and has the unit of mm; and (5) air cooling after discharging the normalizing furnace.
The Cr-containing normalized nuclear power steel plate provided by the invention has the following chemical components:
c: the most effective element for improving the strength of steel, particularly normalized steel, needs to increase the carbon content and obtain more pearlite to ensure the strength of the steel plate, but the higher the carbon content is, the lower the welding performance, the impact toughness and the elongation rate are, so the C content of the steel is selected to be 0.17-0.20%.
Mn: is an important strengthening and toughening element. However, the Mn content is increased, the steel has serious band-shaped structure and obvious segregation, and the corrosion resistance is influenced, so the Mn content of the steel is controlled to be 1.10-1.20%.
Nb: the recrystallization of austenite can be delayed, the phase transformation temperature is reduced, the grain refining effect is obvious, the low-temperature toughness can be improved, and the Nb obtains the required strength through mechanisms such as solid solution strengthening, phase transformation strengthening, precipitation strengthening and the like, so the Nb content of the steel is selected to be 0.01-0.02%.
Cr: the strength of the steel is improved, the corrosion resistance of the steel is positively influenced, the banded structure is reduced, the steel plate has poor low-temperature impact toughness along with the increase of the chromium content, the tensile strength exceeds the standard, and the elongation is unqualified, so that the Cr content of the steel needs to be controlled to be 0.21-0.26%.
Si: is an important reducing agent and deoxidizing agent in the steel-making process, can be dissolved in ferrite and austenite to improve the hardness and strength of steel. The silicon content in the steel is improved, and the low-temperature toughness of the steel plate is reduced, so that the Si content is 0.15-0.35%.
And Als: the deoxidizing nitrogen-fixing agent in steel making, and refining crystal grains, inhibiting the aging of low-carbon steel, improving the toughness of steel at low temperature, excessive aluminum which is not beneficial to slab casting, and slabs which are easy to crack, so the aluminum content is controlled at 0.015-0.045%.
Ti: titanium has strong affinity with nitrogen, oxygen and carbon, and is a good deoxidizing and degassing agent and an effective element for fixing nitrogen and carbon. The TiC particles have the function of preventing steel crystal grains from growing and coarsening in the heating process of the plate blank, and excessive Ti (C, N) second phase particles deteriorate the low-temperature impact toughness, so the content of titanium is 0.01-0.02 percent.
P and S are harmful impurity elements which are difficult to avoid in steel. The high P can cause segregation, influence the uniformity of steel structure and reduce the plasticity of steel; s is prone to form sulfide inclusions which are detrimental to low temperature toughness and can cause performance anisotropy. Therefore, P is selected to be less than or equal to 0.018 percent, and S is selected to be less than or equal to 0.005 percent.
In the production method of the Cr-containing normalized nuclear power steel plate, the SA516Gr.70 steel plate with the thickness of 12-75 mm is produced by controlling the rolling and normalizing processes, the CEV is less than or equal to 0.43 percent, the transverse impact value at minus 40 ℃ is more than 80J, the yield strength is 320-360MPa,the tensile strength is 500-535MPa, the elongation is more than 28 percent, and the corrosion resistance rate is not more than 1.0g/m 2 ·h。
Compared with the prior art, the invention has the following beneficial effects: the invention reduces the contents of sulfur, phosphorus and hydrogen in steel by strictly controlling the content of Mn and properly adding chromium and niobium, adopts two-stage controlled rolling, accurately controls the finishing rolling temperature to be 820-860 ℃ and AC 3 The SA516Gr.70 steel plate with the thickness of 12-75 mm is produced by processes of normalizing temperature at +20 ℃ and the like, and has excellent corrosion resistance and normal-temperature and low-temperature mechanical properties.
Drawings
FIG. 1 is a view showing that the metallographic structure of the hot rolled steel sheet in example 3 is ferrite + pearlite, a banded structure is 3.0, and a grain size is 8.5 grade;
FIG. 2 shows that the normalized steel sheet of example 3 had a ferrite + pearlite metallographic structure, a 0.5-grade banded structure and a 9.0-grade grain size.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
A SA516Gr.70 steel plate for auxiliary machinery of a nuclear power plant comprises the chemical components and weight percentages shown in example 1 in Table 1, and the balance of Fe and inevitable impurities.
The production method of the SA516Gr.70 steel plate for the auxiliary machine of the nuclear power plant comprises the following processes:
1) A steel-making process: the process flow comprises converter smelting, LF refining, RH refining and continuous casting; the steel tapping P of the converter is 0.012 percent, the white slag retention time is 22 minutes, the S content is 0.005 percent, the RH treatment vacuum degree is 67MPa, the vacuum retention time is 16 minutes, the H content is 1.3ppm, the superheat degree is 23 ℃, the pulling speed is 1.0m/min, the liquid level fluctuation of a crystallizer is 2mm, and the surface of a plate blank is free of defects.
2) A blank heating procedure: preheating the blank with the thickness of 250mm at 832 ℃, 1175 ℃ in the first adding section, 1242 ℃ in the second adding section, soaking at 1226 ℃ for 270 minutes in the furnace, and rolling after reaching the temperature;
3) A rolling procedure: two-stage rolling is adopted, wherein the initial rolling temperature of rough rolling is 1058 ℃, high-temperature low-speed high-pressure rolling is adopted, the rolling speed is less than or equal to 2.5m/s, and the pass reduction rate is more than 12%; the initial rolling temperature of finish rolling is 950 ℃, the thickness of the steel plate is 50mm, the final rolling temperature is 835 ℃, and the steel plate is rolled to 12mm; air cooling is carried out after rolling;
4) A heat treatment process: normalizing the steel plate, keeping the temperature at 860 ℃ for 48 minutes in the furnace, and cooling in air after discharging.
Example 2
A SA516Gr.70 steel plate for auxiliary machinery of a nuclear power plant comprises the chemical components and weight percentages shown in example 2 in Table 1, and the balance of Fe and inevitable impurities.
The production method of the SA516Gr.70 steel plate for the auxiliary machine of the nuclear power plant comprises the following processes of:
1) A steel making process: the process flow comprises converter smelting, LF refining, RH refining and continuous casting; the tapping P of the converter is 0.015 percent, the white slag retention time is 23 minutes, the S content is 0.002 percent, the RH treatment vacuum degree is 67MPa, the vacuum retention time is 16 minutes, the H content is 1.2ppm, the superheat degree is 25 ℃, the casting speed is 1.0m/min, the liquid level fluctuation of a crystallizer is 2mm, and the surface of a plate blank has no defects.
2) A blank heating procedure: preheating the blank with the thickness of 250mm at 790 ℃, heating the blank at 1196 ℃ in the first heating section, heating the blank at 1244 ℃ in the second heating section, soaking at 1231 ℃ for 280 minutes in the furnace, and rolling after reaching the temperature;
3) A rolling procedure: two-stage rolling is adopted, wherein the initial rolling temperature of rough rolling is 1062 ℃, high-temperature low-speed high-pressure rolling is adopted, the rolling speed is less than or equal to 2.5m/s, and the pass reduction rate is more than 12%; the finish rolling initial rolling temperature is 900 ℃, the steel plate thickness is 90mm, the finish rolling temperature is 838 ℃, the steel plate is rolled to 40mm, and air cooling is carried out after rolling;
4) A heat treatment process: normalizing and preserving the temperature of 865 ℃ for 88 minutes in the furnace, and air cooling after discharging.
Example 3
A SA516Gr.70 steel plate for auxiliary machinery of a nuclear power plant comprises the chemical components and weight percentages shown in example 3 in Table 1, and the balance of Fe and inevitable impurities.
The production method of the SA516Gr.70 steel plate for the auxiliary machine of the nuclear power plant comprises the following processes:
1) A steel making process: the process flow comprises converter smelting, LF refining, RH refining and continuous casting; the steel tapping P of the converter is 0.016 percent, the white slag retention time is 21 minutes, the S content is 0.003 percent, the RH treatment vacuum degree is 67MPa, the vacuum retention time is 16 minutes, the H content is 1.1ppm, the superheat degree is 20 ℃, the pulling speed is 1.0m/min, the liquid level fluctuation of a crystallizer is 2mm, and the surface of a plate blank is free of defects.
2) A blank heating procedure: the temperature of a preheating section of a billet with the thickness of 295mm is 760 ℃, the temperature of a first feeding section is 1186 ℃, the temperature of a second feeding section is 1245 ℃, the soaking temperature is 1227 ℃, the time in the furnace is 350 minutes, and the rolling is carried out after the temperature is reached;
3) A rolling procedure: two-stage rolling is adopted, wherein the initial rolling temperature of rough rolling is 1025 ℃, high-temperature low-speed high-pressure rolling is adopted, the rolling speed is less than or equal to 2.5m/s, and the pass reduction rate is more than 12%; the finish rolling initial rolling temperature is 902 ℃, the thickness of the steel plate is 160mm, the finish rolling temperature is 845 ℃, the steel plate is rolled to 75mm, and air cooling is carried out after rolling;
4) A heat treatment process: normalizing and preserving the temperature of 865 ℃ for 165 minutes in the furnace, and air-cooling after discharging.
Comparative example 1
A conventional SA516Gr.70 steel sheet has chemical compositions and weight percentages shown in comparative example 1 of Table 1, with the balance being Fe and inevitable impurities.
The production method of the common SA516Gr.70 steel plate comprises the following processes:
1) A steel making process: the process flow comprises converter smelting, LF refining, RH refining and continuous casting; the tapping P of the converter is 0.024%, the white slag retention time is 15 minutes, the S content is 0.006%, the RH treatment vacuum degree is 67MPa, the vacuum retention time is 10 minutes, the H content is 1.5ppm, the superheat degree is 25 ℃, the pulling speed is 1.0m/min, the liquid level fluctuation of a crystallizer is 2mm, and the surface of a plate blank has no defects.
2) A blank heating procedure: the temperature of a preheating section of a billet with the thickness of 295mm is 760 ℃, the temperature of a first feeding section is 1186 ℃, the temperature of a second feeding section is 1245 ℃, the soaking temperature is 1227 ℃, the time in the furnace is 350 minutes, and the rolling is carried out after the temperature is reached;
3) A rolling procedure: two-stage rolling is adopted, wherein the initial rolling temperature of rough rolling is 1025 ℃, high-temperature low-speed high-pressure rolling is adopted, the rolling speed is less than or equal to 2.5m/s, and the pass reduction rate is more than 12%; the finish rolling initial rolling temperature is 850 ℃, the thickness of the steel plate is 160mm, the finish rolling temperature is 815 ℃, the steel plate is rolled to 75mm, and air cooling is carried out after rolling;
4) A heat treatment process: normalizing and keeping the temperature of the steel plate at 910 ℃ for 105 minutes in the furnace, and cooling in air after discharging.
Comparative example 2
A conventional SA516Gr.70 steel plate has chemical compositions and weight percentages shown in comparative example 2 of Table 1, and the balance of Fe and inevitable impurities.
The production method of the common SA516Gr.70 steel plate comprises the following processes:
1) A steel-making process: the process flow comprises converter smelting, LF refining, RH refining and continuous casting; the tapping P of the converter is 0.015 percent, the white slag retention time is 23 minutes, the S content is 0.002 percent, the RH treatment vacuum degree is 67MPa, the vacuum retention time is 16 minutes, the H content is 1.2ppm, the superheat degree is 25 ℃, the pulling speed is 1.0m/min, the liquid level fluctuation of a crystallizer is 2mm, and the surface of a plate blank is free of defects.
2) A blank heating procedure: the preheating section temperature of a blank with the thickness of 250mm is 795 ℃, the first heating section is 1190 ℃, the second heating section is 1243 ℃, the soaking temperature is 1235 ℃, the furnace time is 280 minutes, and the rolling is carried out after the temperature is reached;
3) A rolling procedure: two-stage rolling is adopted, wherein the initial rolling temperature of rough rolling is 1062 ℃, high-temperature low-speed high-pressure rolling is adopted, the rolling speed is less than or equal to 2.5m/s, and the pass reduction rate is more than 12%; the initial rolling temperature of the finish rolling is 880 ℃, the thickness of the steel plate is 90mm, the final rolling temperature is 808 ℃, the steel plate is rolled to 40mm, and the steel plate is air-cooled after the rolling;
4) A heat treatment process: normalizing the steel plate, keeping the temperature at 900 ℃ for 60 minutes in the furnace, and cooling the steel plate in air after discharging.
Comparative example 3
A conventional SA516Gr.70 steel sheet has chemical compositions and weight percentages shown in comparative example 3 of Table 1, with the balance being Fe and inevitable impurities.
The production method of the common SA516Gr.70 steel plate comprises the following processes:
1) A steel making process: the process flow comprises converter smelting, LF refining, RH refining and continuous casting; the steel tapping P of the converter is 0.016 percent, the white slag retention time is 20 minutes, the S content is 0.003 percent, the RH treatment vacuum degree is 67MPa, the vacuum retention time is 15 minutes, the H content is 1.2ppm, the superheat degree is 24 ℃, the pulling speed is 1.0m/min, the liquid level fluctuation of a crystallizer is 2mm, and the surface of a plate blank is free of defects.
2) A blank heating procedure: preheating 230mm thick blank, wherein the temperature of the preheating section is 790 ℃, the first heating section is 1196 ℃, the second heating section is 1249 ℃, the soaking temperature is 1245 ℃, the furnace time is 265 minutes, and the blank is rolled after reaching the temperature;
3) A rolling procedure: two-stage rolling is adopted, wherein the initial rolling temperature of rough rolling is 1042 ℃, high-temperature low-speed high-pressure rolling is adopted, the rolling speed is less than or equal to 2.5m/s, and the pass reduction rate is more than 12%; the finish rolling initial rolling temperature is 900 ℃, the thickness of the steel plate is 65mm, the finish rolling temperature is 803 ℃, the steel plate is rolled to 16mm, and air cooling is carried out after rolling;
4) A heat treatment process: normalizing the steel plate, keeping the temperature at 900 ℃ for 35 minutes in the furnace, and cooling the steel plate in air after discharging.
TABLE 1 Steel sheet weight percentage (wt%) in each example and comparative example
The mechanical properties of the SA516Gr.70 steel plate for the auxiliary machinery of the nuclear power plant described in the embodiment 1-the embodiment 3 and the commonly used SA516Gr.70 steel plate in the comparative example 1-the comparative example 3 are shown in the following table 2.
TABLE 2 Properties of the steel sheets in each of examples and comparative examples
The steel plate has the following performance: the yield strength is 330-351MPa, the tensile strength is 505-524MPa, the elongation A is more than or equal to 28 percent, the average value of transverse V-shaped impact absorption energy at minus 40 ℃ is more than or equal to 80J, the steel plate has moderate strength, good low-temperature impact performance, low comparative strength and low-temperature impact value. Corrosion resistance test of steel plate by JB/T7901-1999 method, example 1 corrosion resistance rate 0.83g/m 2 H, corrosion resistance rate of comparative example 3 1.74g/m 2 H. According to test data, the steel plate produced by adopting the technology completely meets the design requirement of the auxiliary equipment SA516Gr.70 steel plate of the nuclear power plant, and is beneficial to ensuring the safe operation of the nuclear power plant.
The above detailed description of a Cr-containing normalized nuclear power steel sheet and the method of manufacturing the same with reference to the embodiments is illustrative and not restrictive, and several embodiments may be enumerated within the scope of the limitations, so that changes and modifications may be made without departing from the spirit of the present invention.
Claims (10)
1. The steel plate for Cr-containing normalized nuclear power is characterized by comprising the following chemical components in percentage by weight: c:0.17 to 0.20%, si:0.15 to 0.35%, mn:1.10 to 1.20%, P: less than or equal to 0.018 percent, less than or equal to 0.005 percent of S, nb: 0.010-0.020%, cr:0.21 to 0.26%, als:0.015 to 0.045%, ti: 0.010-0.020%, CEV less than or equal to 0.43%, and the balance of Fe and inevitable impurities.
2. The Cr-containing normalized nuclear power steel sheet according to claim 1, characterized in that the metallographic structure of the Cr-containing normalized nuclear power steel sheet is ferrite + pearlite with a grain size of 9.0 grade.
3. The Cr-containing normalized steel plate for nuclear power as claimed in claim 1, wherein the Cr-containing normalized steel plate for nuclear power has a yield strength of 320-360MPa, a tensile strength of 500-535MPa, an elongation A of 28% or more, an average value of energy absorbed by transverse V-shaped impact at-40 ℃ of 80J or more, and a corrosion resistance rate of 1.0g/m or less 2 ·h。
4. The method for manufacturing a Cr-containing normalized nuclear power steel sheet as set forth in any one of claims 1 to 3, characterized by comprising the steps of: converter smelting, LF refining, RH vacuum refining, continuous casting, hot rolling and heat treatment.
5. The manufacturing method according to claim 4, wherein in the LF refining step, white slag is operated, the white slag holding time is more than 20min, and S is controlled to be less than or equal to 0.005%.
6. The manufacturing method according to claim 4, wherein in the hot rolling step, the temperature of the blank preheating section is 700-900 ℃, the temperature of the first heating section is 1100-1200 ℃, the temperature of the second heating section is 1200-1250 ℃, the soaking temperature is 1200-1240 ℃, the furnace time is (1.0-1.2) x H minutes, and H is the thickness of the slab and is in mm; and rolling after reaching the temperature.
7. The manufacturing method according to claim 4, wherein in the hot rolling step, two-stage rolling is adopted, and the rough rolling start rolling temperature is more than 1000 ℃; the initial rolling temperature of the finish rolling is less than or equal to 950 ℃, the finishing rolling temperature is 820-860 ℃, and the air cooling is carried out after the rolling.
8. The manufacturing method according to claim 4, wherein in the hot rolling step, the reduction rate of the rough rolling pass is greater than 12%; the accumulated deformation rate of finish rolling is more than 50 percent.
9. The manufacturing method according to claim 4, wherein the heat treatment is a normalizing treatment.
10. The manufacturing method according to claim 4, wherein in the heat treatment step, for a steel sheet having a thickness of 15mm or less, the normalizing temperature is 860 ± 10 ℃, the furnace time is 4 xh minutes, and H is the thickness of the steel sheet in mm; air cooling after normalizing discharge; for a steel plate with the thickness of more than 15mm and less than or equal to 75mm, the normalizing temperature is 865 +/-10 ℃, the furnace time is 2.2 XH minutes, and H is the thickness of the steel plate and has the unit of mm; and air cooling after normalizing discharge.
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| JPH0959716A (en) * | 1995-08-24 | 1997-03-04 | Sumitomo Metal Ind Ltd | Production of normalized steel plate |
| CN106133176A (en) * | 2014-04-03 | 2016-11-16 | 杰富意钢铁株式会社 | Pipe as fuel injection seamless steel pipe |
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Inventor after: Dong Fujun Inventor after: Wang Kunming Inventor after: Liu Dongxu Inventor after: Zhu Yongkuan Inventor after: Xiong Xiong Inventor after: Zheng Jingbin Inventor after: Huang Zhen Inventor after: Li Lei Inventor after: Yan Long Inventor after: Peng Xu Inventor after: Peng Bin Inventor after: Liu Xiaolin Inventor after: Qiu Xianghua Inventor after: Yuan Jing Inventor after: Liu Shenghe Inventor after: Yang Fan Inventor after: Liu Jianfeng Inventor after: Xiong Wenming Inventor after: Cao Ruihong Inventor after: Lv Jiping Inventor before: Dong Fujun Inventor before: Wang Kunming Inventor before: Liu Dongxu Inventor before: Zhu Yongkuan Inventor before: Xiong Xiong Inventor before: Zheng Jingbin Inventor before: Huang Zhen Inventor before: Li Lei Inventor before: Yan Long Inventor before: Peng Xu Inventor before: Peng Bin Inventor before: Liu Xiaolin Inventor before: Qiu Xianghua Inventor before: Yuan Jing Inventor before: Liu Shenghe Inventor before: Yang Fan Inventor before: Liu Jianfeng Inventor before: Xiong Wenming Inventor before: Cao Ruihong Inventor before: Lv Jiping |