CN115772634B - 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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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 99
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- 238000005260 corrosion Methods 0.000 claims abstract description 15
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- 239000000126 substance Substances 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims description 90
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Abstract
The invention discloses a Cr-containing normalized nuclear power steel plate and a manufacturing method thereof, wherein the Cr-containing normalized nuclear power steel plate comprises the following chemical components in percentage by weight: c:0.17 to 0.20 percent, si:0.15 to 0.35 percent, mn:1.10 to 1.20 percent, nb:0.010 to 0.020%, cr:0.21 to 0.26 percent, als: 0.015-0.045%, ti:0.010 to 0.020 percent, CEV is less than or equal to 0.43 percent, and the balance is Fe and unavoidable impurities; the invention produces the SA516Gr.70 steel plate with the thickness of 12-75 mm by strictly controlling Mn content and adding chromium and niobium elements, the transverse impact value of the steel plate is more than 80J at minus 40 ℃, 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, the corrosion resistance and the normal temperature and low temperature mechanical properties are excellent.
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, the implementation of energy conservation and emission reduction must be quickened, clean energy is greatly developed, and the national economy is ensured to develop rapidly and well. The world nuclear power technology development and operation practice proves that nuclear energy has the advantages of cleanliness, safety and capability of providing stable power on a large scale, and is increasingly favored.
The auxiliary machine of the nuclear power station is auxiliary machinery of production equipment of the power station, is an important component part of the equipment of the power station, is indispensable equipment for normal operation of the equipment of the power station, and is quite important in terms of value, the main machine and the auxiliary machine respectively account for half of equipment investment. The auxiliary equipment of the power station except the main machine is an auxiliary machine, the related doors are many, the manufacturing difficulty of the auxiliary machine equipment is high, and the reliability requirement is high.
Auxiliary equipment of a nuclear power station, such as a sewage disposal and trash disposal device and a seawater filtering device, needs to resist seawater corrosion, has a corrosion rate not exceeding 1.5g/m < 2 >. H, and simultaneously needs to have good low-temperature toughness. Chinese patent CN102703831a discloses a seamless steel tube for Cu-containing Cr-controlled nuclear power plant and a production method thereof, wherein the seamless steel tube comprises the following chemical components 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 unavoidable impurities; the method has the advantages that by adding Cu, cr and other alloy elements, harmful elements are strictly controlled, a round billet with high purity, low gas and low inclusion is obtained, and a reasonable heating system, a rolling process and a heat treatment system are formulated, so that the steel grade has much higher strength and excellent FAC resistance than carbon steel; however, the patent does not pay attention to the corrosion resistance of the seamless steel tube for the Cu-containing Cr-controlled nuclear power plant, and no corrosion-resistant steel plate applied to auxiliary equipment of the nuclear power plant is disclosed in the prior art.
Disclosure of Invention
The invention aims to provide a Cr-containing normalized nuclear power steel plate and a manufacturing method thereof, which have excellent corrosion resistance and normal-temperature and low-temperature mechanical properties.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the Cr-containing normalized nuclear power steel plate comprises the following chemical components in percentage by weight: c:0.17 to 0.20 percent, si:0.15 to 0.35 percent, mn:1.10 to 1.20 percent, P: less than or equal to 0.018 percent, S less than or equal to 0.005 percent, nb:0.010 to 0.020%, cr:0.21 to 0.26 percent, als: 0.015-0.045%, ti: 0.010-0.020%, CEV less than or equal to 0.43%, and the balance of Fe and unavoidable impurities.
The metallographic structure of the Cr-containing normalized nuclear power steel plate is ferrite and pearlite, the grain size is 9.0 level, and the band structure is 0.5 level.
The yield strength of the Cr-containing normalized nuclear power steel plate is 320-360MPa, the tensile strength is 500-535MPa, the elongation A is more than or equal to 28%, the average value of transverse V-shaped impact absorption energy at minus 40 ℃ is more than or equal to 80J, and the corrosion resistance rate is not more than 1.0g/m 2 ·h。
The invention also provides a manufacturing method of the Cr-containing normalized nuclear power steel plate, 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 is operated, the white slag holding time is more than 20min, S is controlled to be less than or equal to 0.005%, 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 core part 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 to be in the range of 10-30 ℃, the constant pulling speed is operated, and the fluctuation of the liquid level of the crystallizer is in the range of +/-3 mm; and after continuous casting, cleaning the blank, and cleaning the corners and the surfaces of the blank, wherein no surface cracks and corner cracks exist.
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 is 1.0-1.2 multiplied by H minutes, and H is the plate thickness of a plate blank, and the unit is mm; and rolling after the temperature is reached.
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 final rolling temperature is 820-860 ℃, and the air cooling is carried out after the rolling. And deforming above the recrystallization temperature, completely recrystallizing, refining austenite grains, and final rolling at the dynamic recrystallization temperature of about 850 ℃ to induce strain to separate out, thereby preventing the austenite grains from growing.
In the hot rolling step, the reduction rate of the rough rolling pass is more than 12%; the cumulative deformation rate of finish rolling is more than 50%.
The heat treatment is normalizing treatment.
AC of steel calculated by empirical formula 3 The temperature is about 840 ℃ and slightly higher than AC 3 The temperature normalizing can ensure that the steel plate has good toughness. In the heat treatment step, for the steel plate with the thickness less than or equal to 15mm, the normalizing temperature is 860+/-10 ℃, the furnace time is 4 XH minutes, and H is the thickness of the steel plate and the unit is mm; air cooling after normalizing and discharging; for steel plates with the thickness of less than or equal to 75mm and 15mm, the normalizing temperature is 865+/-10 ℃, the furnace time is 2.2 XH minutes, and H is the thickness of the steel plates and is expressed in mm; and (5) air cooling after normalizing and discharging.
The control and function of each chemical component in the Cr-containing normalized nuclear power steel plate provided by the invention are as follows:
c: the most effective elements for improving the strength of steel, especially normalized steel, need to increase the carbon content to 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 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 band-shaped structure in the steel is serious, segregation is obvious, and the corrosion resistance is affected, so the Mn content of the steel needs to be controlled to be 1.10-1.20%.
Nb: the austenite recrystallization can be delayed, the phase transformation temperature is reduced, the grain refinement effect is obvious, the low-temperature toughness can be improved, and the Nb obtains the required strength through solid solution strengthening, phase transformation strengthening, precipitation strengthening and other mechanisms, so that the steel grade selects the Nb content 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 lightened, the low-temperature impact toughness of the steel plate is poor 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 is controlled to be 0.21-0.26%.
Si: is an important reducing agent and deoxidizer in the steelmaking process, and 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%.
Als: the deoxidizing and nitrogen fixing agent for steelmaking refines grains, inhibits aging of low-carbon steel, improves toughness of the steel at low temperature, and is unfavorable for slab casting due to excessive aluminum, and the slab is easy to crack, so that the aluminum content is controlled to be 0.015-0.045%.
Ti: titanium, nitrogen, oxygen and carbon have extremely strong affinity, and are good deoxidizing and degassing agents and effective elements for fixing nitrogen and carbon. TiC particles have the effect of preventing steel grains from growing and coarsening in the slab heating process, and excessive Ti (C, N) second phase particles deteriorate low-temperature impact toughness, so the titanium content is 0.01-0.02%.
P, S is a harmful impurity element which is 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 anisotropy in properties. So the steel grade is less than or equal to 0.018 percent and 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 content of sulfur, phosphorus and hydrogen in steel by strictly controlling Mn content and properly adding chromium and niobium elements, adopts two-stage controlled rolling, precisely controls the final rolling temperature of 820-860 ℃ and AC 3 The SA516Gr.70 steel plate with the thickness of 12-75 mm is produced by the processes of +20 ℃ normalizing temperature and the like, and has excellent corrosion resistance and normal temperature and low temperature mechanical properties.
Drawings
FIG. 1 shows a hot rolled steel sheet of example 3, which has a microstructure of ferrite+pearlite, a band structure of 3.0, and a grain size of 8.5 grade;
fig. 2 shows a metallographic structure of the normalized steel sheet of example 3, which is ferrite+pearlite, a band structure of 0.5 grade, and a grain size of 9.0 grade.
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 has the chemical composition and weight percentage shown in example 1 in Table 1, and the balance of Fe and unavoidable impurities.
The production method of the SA516Gr.70 steel plate for the auxiliary machinery of the nuclear power station comprises the following steps:
1) Steelmaking process: the process flow comprises converter smelting, LF refining, RH refining and continuous casting; the tapping P of the converter is 0.012 percent, the holding time of white slag is 22 minutes, the S content is 0.005 percent, the RH treatment vacuum degree is 67MPa, the vacuum holding time is 16 minutes, the H content is 1.3ppm, the superheat degree is 23 ℃, the pulling speed is 1.0m/min, the fluctuation of the liquid level of a crystallizer is 2mm, and the surface of a plate blank has no defects.
2) Blank heating procedure: the preheating section temperature of the blank with the thickness of 250mm is 832 ℃, the first adding section 1175 ℃, the second adding section 1242 ℃, the soaking temperature is 1226 ℃, and the rolling is carried out after the furnace time is 270 minutes;
3) And (3) rolling: two-stage rolling is adopted, the initial rolling temperature of rough rolling is 1058 ℃, high-temperature low-speed large-reduction rolling is adopted, the roller 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 rolling is carried out until the thickness reaches 12mm; air cooling after rolling;
4) And (3) a heat treatment procedure: normalizing the steel plate, preserving heat at 860 ℃ for 48 minutes in the furnace time, and air cooling after discharging.
Example 2
A SA516Gr.70 steel plate for auxiliary machinery of a nuclear power plant has the chemical composition and weight percentage shown in example 2 in Table 1, and the balance of Fe and unavoidable impurities.
The production method of the SA516Gr.70 steel plate for the auxiliary machinery of the nuclear power station comprises the following steps:
1) Steelmaking process: the process flow comprises converter smelting, LF refining, RH refining and continuous casting; the tapping P of the converter is 0.015%, the holding time of white slag is 23 minutes, the S content is 0.002%, the RH treatment vacuum degree is 67MPa, the vacuum holding time is 16 minutes, the H content is 1.2ppm, the superheat degree is 25 ℃, the pulling speed is 1.0m/min, the fluctuation of the liquid level of the crystallizer is 2mm, and the surface of a slab is defect-free.
2) Blank heating procedure: the preheating section temperature of the blank with the thickness of 250mm is 790 ℃, the first adding section 1196 ℃, the second adding section 1244 ℃, the soaking temperature is 1231 ℃, and the blank is rolled after the furnace time is 280 minutes and the temperature is reached;
3) And (3) rolling: adopting two-stage rolling, wherein the initial rolling temperature of rough rolling is 1062 ℃, high-temperature low-speed large-reduction rolling is adopted, the roller 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 900 ℃, the thickness of a steel plate is 90mm, the final rolling temperature is 838 ℃, the rolling is carried out until the thickness reaches 40mm, and air cooling is carried out after the rolling;
4) And (3) a heat treatment procedure: and normalizing the steel plate, preserving heat at 865 ℃ for 88 minutes in the furnace time, and air cooling after discharging.
Example 3
A SA516Gr.70 steel plate for auxiliary machinery of a nuclear power plant has the chemical composition and weight percentage shown in example 3 in Table 1, and the balance of Fe and unavoidable impurities.
The production method of the SA516Gr.70 steel plate for the auxiliary machinery of the nuclear power station comprises the following steps:
1) Steelmaking process: the process flow comprises converter smelting, LF refining, RH refining and continuous casting; the tapping P of the converter is 0.016%, the holding time of white slag is 21 minutes, the S content is 0.003%, the RH treatment vacuum degree is 67MPa, the vacuum holding time is 16 minutes, the H content is 1.1ppm, the superheat degree is 20 ℃, the pulling speed is 1.0m/min, the fluctuation of the liquid level of a crystallizer is 2mm, and the surface of a slab is defect-free.
2) Blank heating procedure: the temperature of a preheating section of a blank with the thickness of 295mm is 760 ℃, the temperature of a first adding section 1186 ℃, the temperature of a second adding section 1245 ℃, the soaking temperature 1227 ℃, and the rolling is carried out after the furnace time is 350 minutes and the temperature is reached;
3) And (3) rolling: adopting two-stage rolling, wherein the initial rolling temperature of rough rolling is 1025 ℃, high-temperature low-speed large-reduction rolling is adopted, the roller 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 902 ℃, the thickness of the steel plate is 160mm, the final rolling temperature is 845 ℃, the rolling is carried out until the thickness is 75mm, and air cooling is carried out after the rolling;
4) And (3) a heat treatment procedure: and (3) normalizing the steel plate, preserving heat at 865 ℃ for 165 minutes in the furnace time, and performing air cooling after discharging.
Comparative example 1
A general SA516Gr.70 steel plate has a chemical composition and weight percentage shown in comparative example 1 in Table 1, and the balance being Fe and unavoidable impurities.
The production method of the common SA516Gr.70 steel plate comprises the following steps:
1) Steelmaking process: the process flow comprises converter smelting, LF refining, RH refining and continuous casting; the tapping P of the converter is 0.024%, the holding time of white slag is 15 minutes, the S content is 0.006%, the RH treatment vacuum degree is 67MPa, the vacuum holding time is 10 minutes, the H content is 1.5ppm, the superheat degree is 25 ℃, the pulling speed is 1.0m/min, the fluctuation of the liquid level of a crystallizer is 2mm, and the surface of a plate blank is defect-free.
2) Blank heating procedure: the temperature of a preheating section of a blank with the thickness of 295mm is 760 ℃, the temperature of a first adding section 1186 ℃, the temperature of a second adding section 1245 ℃, the soaking temperature 1227 ℃, and the rolling is carried out after the furnace time is 350 minutes and the temperature is reached;
3) And (3) rolling: adopting two-stage rolling, wherein the initial rolling temperature of rough rolling is 1025 ℃, high-temperature low-speed large-reduction rolling is adopted, the roller 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 850 ℃, the thickness of the steel plate is 160mm, the final rolling temperature is 815 ℃, the rolling is 75mm, and air cooling is carried out after rolling;
4) And (3) a heat treatment procedure: and normalizing the steel plate, preserving heat at 910 ℃ for 105 minutes in the furnace time, and air cooling after discharging.
Comparative example 2
A general SA516Gr.70 steel plate has a chemical composition and weight percentage shown in comparative example 2 in Table 1, and the balance being Fe and unavoidable impurities.
The production method of the common SA516Gr.70 steel plate comprises the following steps:
1) Steelmaking process: the process flow comprises converter smelting, LF refining, RH refining and continuous casting; the tapping P of the converter is 0.015%, the holding time of white slag is 23 minutes, the S content is 0.002%, the RH treatment vacuum degree is 67MPa, the vacuum holding time is 16 minutes, the H content is 1.2ppm, the superheat degree is 25 ℃, the pulling speed is 1.0m/min, the fluctuation of the liquid level of the crystallizer is 2mm, and the surface of a slab is defect-free.
2) Blank heating procedure: the preheating section temperature of the blank with the thickness of 250mm is 795 ℃, the first adding section 1190 ℃, the second adding section 1243 ℃, the soaking temperature is 1235 ℃, the furnace time is 280 minutes, and rolling is carried out after reaching the temperature;
3) And (3) rolling: adopting two-stage rolling, wherein the initial rolling temperature of rough rolling is 1062 ℃, high-temperature low-speed large-reduction rolling is adopted, the roller 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 880 ℃, the thickness of the steel plate is 90mm, the final rolling temperature is 808 ℃, the rolling is carried out until the thickness reaches 40mm, and air cooling is carried out after the rolling;
4) And (3) a heat treatment procedure: normalizing the steel plate, preserving heat at 900 ℃ for 60 minutes in the furnace time, and air cooling after discharging.
Comparative example 3
A general SA516Gr.70 steel plate has a chemical composition and weight percentage shown in comparative example 3 in Table 1, and the balance being Fe and unavoidable impurities.
The production method of the common SA516Gr.70 steel plate comprises the following steps:
1) Steelmaking process: the process flow comprises converter smelting, LF refining, RH refining and continuous casting; the tapping P of the converter is 0.016%, the holding time of white slag is 20 minutes, the S content is 0.003%, the RH treatment vacuum degree is 67MPa, the vacuum holding time is 15 minutes, the H content is 1.2ppm, the superheat degree is 24 ℃, the pulling speed is 1.0m/min, the fluctuation of the liquid level of the crystallizer is 2mm, and the surface of a slab is defect-free.
2) Blank heating procedure: the temperature of a preheating section of a blank with the thickness of 230mm is 790 ℃, the temperature of a first adding section 1196 ℃, the temperature of a second adding section 1249 ℃, the soaking temperature 1245 ℃, and rolling after the temperature reaches the temperature for 265 minutes in a furnace;
3) And (3) rolling: adopting two-stage rolling, wherein the initial rolling temperature of rough rolling is 1042 ℃, high-temperature low-speed large-reduction rolling is adopted, the roller speed is less than or equal to 2.5m/s, and the pass reduction rate is more than 12%; finish rolling is carried out at a start rolling temperature of 900 ℃, the thickness of a steel plate is 65mm, a finish rolling temperature is 803 ℃, rolling is carried out until the thickness is 16mm, and air cooling is carried out after rolling;
4) And (3) a heat treatment procedure: normalizing the steel plate, preserving heat at 900 ℃ for 35 minutes in the furnace time, and air cooling after discharging.
Table 1 the mass% of steel sheets in each example and comparative example (wt%)
The mechanical properties of the SA516Gr.70 steel plates for nuclear power plant auxiliary machinery described in example 1-example 3, and the conventional SA516Gr.70 steel plates for comparative examples 1-3 are shown in Table 2 below.
Table 2 properties of steel sheets in each example and comparative example
The performance of the steel plate of the invention meets the following conditions: the yield strength is 330-351MPa, the tensile strength is 505-524MPa, the elongation A is more than or equal to 28%, the average value of transverse V-shaped impact absorption energy at minus 40 ℃ is more than or equal to 80J, the steel plate strength is moderate, the low-temperature impact performance is good, the comparative example strength is low, and the low-temperature impact value is low. Corrosion resistance test of steel sheets was performed by JB/T7901-1999 method, example 1 corrosion resistance rate was 0.83g/m 2 H, corrosion resistance of comparative example 3 1.74g/m 2 H. From 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 station, and is beneficial to ensuring the safe operation of the nuclear power station.
The foregoing detailed description of a Cr-containing normalized nuclear power steel plate and a method for manufacturing the same, which are described in detail with reference to the examples, are illustrative and not restrictive, and several examples can be enumerated according to the limited scope, so that variations and modifications are possible within the scope of the present invention without departing from the general inventive concept.
Claims (6)
1. The Cr-containing normalized nuclear power steel plate is characterized by comprising the following chemical components in percentage by weight: c:0.17 to 0.20 percent, si:0.15 to 0.35 percent, mn:1.10 to 1.20 percent, P: less than or equal to 0.018 percent, S less than or equal to 0.005 percent, nb:0.010 to 0.018%, cr:0.21 to 0.26 percent, als: 0.015-0.045%, ti:0.010 to 0.020 percent, CEV is less than or equal to 0.43 percent, and the balance is Fe and unavoidable impurities;
the metallographic structure of the Cr-containing normalized nuclear power steel plate is ferrite and pearlite, and the grain size is 9.0 grade;
the Cr-containing normalized nuclear power plantThe corrosion resistance rate of the steel plate is not more than 1.0g/m 2 ·h；
The manufacturing method of the Cr-containing normalized nuclear power steel plate comprises the following steps of: converter smelting, LF refining, RH vacuum refining, continuous casting, hot rolling and heat treatment;
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 final rolling temperature is 820-860 ℃, and the air cooling is carried out after the rolling;
the heat treatment is normalizing treatment;
in the heat treatment step, for the steel plate with the thickness less than or equal to 15mm, the normalizing temperature is 860+/-10 ℃, the furnace time is 4 XH minutes, and H is the thickness of the steel plate and the unit is mm; air cooling after normalizing and discharging; for steel plates with the thickness of less than or equal to 75mm and 15mm, the normalizing temperature is 865+/-10 ℃, the furnace time is 2.2 XH minutes, and H is the thickness of the steel plates and is expressed in mm; and (5) air cooling after normalizing and discharging.
2. The Cr-containing normalized nuclear power steel plate according to claim 1, wherein the yield strength of the Cr-containing normalized nuclear power steel plate is 320-360MPa, the tensile strength is 500-535MPa, the elongation A is more than or equal to 28%, and the average value of transverse V-shaped impact absorption energy at minus 40 ℃ is more than or equal to 80J.
3. The method for manufacturing a Cr-containing normalized nuclear power steel sheet according to claim 1 or 2, characterized in that the method comprises the steps of: converter smelting, LF refining, RH vacuum refining, continuous casting, hot rolling and heat treatment.
4. A method of manufacture according to claim 3, wherein in the LF refining step, the white slag is operated with a white slag hold time > 20min, controlling S +.0.005%.
5. The method according to claim 3, wherein in the hot rolling step, the blank preheating section temperature is 700 to 900 ℃, the first adding section is 1100 to 1200 ℃, the second adding section is 1200 to 1250 ℃, the soaking temperature is 1200 to 1240 ℃, and the furnace time is 1.0 to 1.2) x H minutes, H is the plate thickness of the plate blank, and the unit is mm; and rolling after the temperature is reached.
6. The method according to claim 3, wherein in the hot rolling step, a rough rolling pass reduction is more than 12%; the cumulative deformation rate of finish rolling is more than 50%.
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| CN111926253A (en) * | 2020-07-31 | 2020-11-13 | 五矿营口中板有限责任公司 | Hydrogen sulfide corrosion resistant high-strength toughness normalized steel and manufacturing method thereof |
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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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