CN102181804A - Steel plate for Class I nuclear key equipment and manufacturing method thereof - Google Patents
Steel plate for Class I nuclear key equipment and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a steel plate for Class I nuclear key equipment, and simultaneously discloses a manufacturing method of the steel plate. The steel plate contains the components in percentage by weight as follows: more than 0% but not more than 0.20% of C, 0.10 to 0.30% of Si, 1.20 to 1.60% of Mn, not more than 0.012% of P, not more than 0.012% of S, 0.45 to 0.55% of Mo, 0.50 to 0.80% of Ni, not less than 0 but not more than 0.25% of Cr, not less than 0 but not more than 0.03% of V, not less than 0 but not more than 0.20% of Cu, not less than 0 but not more than 0.040% of Al total, the balance of Fe and unavoidable impurities. The steel plate for the Class I nuclear key equipment has high compactness and strength, good low temperature impact toughness and high temperature stretchability and favorable lamellar tearing resistance, cold processing and welding property, meets the demand of nuclear key equipment, and can be applied to the manufacturing of key equipment, such as evaporators, pressure containers and the like in a nuclear power plant.
Description
Technical field
The present invention relates to the iron and steel technical field, be specifically related to a kind of nuclear one-level key equipment steel plate and production method thereof.
Background technology
Along with domestic nuclear power industrial expansion, the demand that is used to make the steel plate of examining key equipments such as one-level equipment vapour generator, potentiostat cylindrical shell and end socket and peace notes case in the third generation pressurized-water reactor nuclear power plant increases severely.The steel plate of usefulness such as the key equipment vapour generator of third generation pressurized-water reactor nuclear power plant, potentiostat and peace notes case all adopts French RCC-M standard at present, and the trade mark of use is 18MND5(16MND5).Because this steel plate is used in the nuclear island of nuclear power station, contacts nuclear reactive material throughout the year, nuclear reaction produces various severe rugged environments, therefore requires special security and reliability.Steel plate will have good mechanical property, and yield strength, tensile strength height require low-temperature flexibility good, and anti-low temperature brittleness dense structure, tiny, the radiation hardness of crystal grain have good high temperature oxidation resisting, good welding and hot and cold processing characteristics; Product is horizontal, tensile performance in wale-wise is good; Do not have and to be mingled with, flawless, to have the creeping limit characteristics close with creep rupture strength numerical value.And along with the maximization of equipment, the thickness of steel plate is increasing, along with the increase of thickness of slab, brings the deterioration of performance, the reduction of intensity and the decline of low-temperature impact toughness.Nuclear one-level key equipment is to reach following requirement with the main difficulty of steel plate: (1) obdurability coupling is good, yield strength Re 〉=420MPa, tensile strength Rm is 580-700MPa, A 〉=18%, 0 ℃ of transverse impact merit 〉=56J, impact of collision merit 〉=80J ,-20 ℃ of transverse impact merit 〉=40J, impact of collision merit 〉=56J; (2) anti-lamellar tearing performance is good, Z 〉=35%; (3) 350 ℃ of high temperature tensile properties are good, yield strength Rp0.2 〉=350Mpa, Rm 〉=522Mpa; (4) steel is pure, P≤0.012%, S≤0.012%; (5) steel plate interior solid can satisfy the requirement of the S3E4 level non-destructive testing standard of EN10160; (6) steel plate thickness is big, reaches more than the 50mm.Present nuclear one-level key equipment because composition designs and the production method problem, is difficult to satisfy above requirement with steel plate.
Summary of the invention
The object of the present invention is to provide a kind of nuclear one-level key equipment steel plate, also be to provide a kind of production method of examining the one-level key equipment with steel plate simultaneously.
In order to realize above purpose, the technical solution adopted in the present invention is: a kind of nuclear one-level key equipment steel plate, form by following components in weight percentage content: 0＜C≤0.20%, Si:0.10-0.30%, Mn:1.20-1.60%, P≤0.012%, S≤0.012%, Mo:0.45-0.55%, Ni:0.50-0.80%, 0≤Cr≤0.25%, 0≤V≤0.03%, 0≤Cu≤0.20%, 0≤Al
Always≤ 0.040%, surplus is Fe and unavoidable impurities.
Further, the weight percentage of described P, S is P≤0.008%, S≤0.005%.
Preferably, a kind of nuclear one-level key equipment steel plate, described steel plate is made up of following components in weight percentage content: C:0.14-0.20%, Si:0.10-0.20%, Mn:1.20-1.40%, P≤0.006%, S≤0.003%, Mo:0.45-0.50%, Ni:0.60-0.70%, 0≤Cr≤0.25%, 0≤V≤0.03%, 0≤Cu≤0.20%, Al
Always: 0.030-0.035%, surplus is Fe and unavoidable impurities.
The thickness of described steel plate is 50-140mm.
A kind of production method of examining the one-level key equipment with steel plate, step is as follows:
(1) smelt: adopt electric arc furnace smelting, send into the refining of LF refining furnace afterwards and adjust composition, molten steel temperature changes the vacuum degassing furnace vacuum-treat over to when reaching 1510 ± 10 ℃;
(2) casting: the molten steel after the smelting is cast, and obtains strand, and described strand is continuously cast bloom or steel ingot;
(3) heating: described continuously cast bloom is at the continuous oven internal heating, and maximum heating temperature is 1240 ± 10 ℃, and rate of heating is 10-20min/cm, and be 11min/mm total heat-up time; Described steel ingot is at the soaking pit internal heating, and maximum heating temperature is 1240 ± 10 ℃, control rate of heating≤100 ℃/h when temperature is lower than 1000 ℃, soaking time 300-500min;
(4) rolling: adopt II type controlled rolling process, be divided into two stages to be rolled, the fs is the austenite recrystallization stage, and rolling temperature is 1000-1150 ℃, percentage pass reduction 〉=10%, and the accumulative total draft is 30-50%; Subordinate phase is the non-recrystallize stage of austenite, and rolling temperature is 840-900 ℃, and the accumulative total draft is 50-70%; Obtain the work in-process steel plate after rolling;
(5) cooling: the work in-process steel plate adopts water-cooled or stacking cooling, and the red temperature of returning during water-cooled is 650-750 ℃, and stacking cooling total time is 24-48 hour when adopting the stacking cooling;
(6) modified: as to adopt quenching+tempering mode to carry out modified, quenching temperature is 850-950 ℃, soaking time PLC+30min, roller speed 1.5min/mm passes through tempering again after the quenching, tempering temperature is 600-690 ℃, soaking time is 3.0-4.5min/mm, gets the steel plate finished product, and described steel plate finished product is made up of following components in weight percentage content: 0＜C≤0.20%, Si:0.10-0.30%, Mn:1.20-1.60%, P≤0.012%, S≤0.012%, Mo:0.45-0.55%, Ni:0.50-0.80%, 0≤Cr≤0.25%, 0≤V≤0.03%, 0≤Cu≤0.20%, 0≤Al
Always≤ 0.040%, surplus is Fe and unavoidable impurities.
In vacuum-treat forward direction molten steel, add the Al line in the step (1).
Vacuum treated vacuum tightness≤67Pa described in the step (1), 20-60 minute vacuum hold-time.
Continuous casting process is adopted in casting described in the step (2), and superheating temperature is 10-25 ℃, and throwing speed is 0.85-1.15m/min.
The heat-eliminating medium that quenches in the step (6) is a water.
Nuclear one-level key equipment of the present invention is main and other metallic element formation carbide with the effect of each component in the steel plate: C, plays build up and precipitation strength, increases armor plate strength; Si as reductive agent and reductor, improves the intensity of steel plate in steelmaking process; Mn mainly plays solution strengthening and reduces transformation temperature, the effect that improves armor plate strength; Al in steelmaking process as reductor, simultaneously can crystal grain thinning, improve the intensity and the hardness of steel plate; Ni improves the low-temperature impact toughness of steel plate and reduces ductile-brittle transition temperature; The Mo crystal grain thinning, the hardening capacity of raising steel plate; The content of impurity element P, S etc. is low as far as possible, and steel is pure to reach, the uniform purpose of mechanical property.
The present invention examines the one-level key equipment and adopts bainitic steel with the chemical composition design of steel plate, and by appropriate ingredients design and controlled rolling and controlled cooling+quenchings, tempered production technique, production obtains the nuclear one-level key equipment steel plate that thickness is 50-140mm.Condition of delivery of the present invention adds tempering for quenching, the thick nuclear one-level key equipment of the 50-140mm that adopting quenches adds tempering process production obviously improves with the obdurability of steel plate; Owing to adopt II type controlled rolling process, be divided into two stages to be rolled respectively, solve the mill milling insufficient pressure and the thick inequality of crystal grain, the impelling strength that cause lower phenomenon, and increased the thickness specification of steel plate.
The present invention examines the one-level key equipment and has the following advantages with steel plate: (1) obdurability coupling is good, yield strength Re 〉=420Mpa, tensile strength Rm is 580-700Mpa, A 〉=18%, 0 ℃ of transverse impact merit 〉=56J, impact of collision merit 〉=80J ,-20 ℃ of transverse impact merit 〉=40J, impact of collision merit 〉=56J; (2) anti-lamellar tearing performance is good, Z 〉=35%; (3) 350 ℃ of high temperature tensile properties are good, yield strength Rp0.2 〉=350Mpa, Rm 〉=522Mpa; (4) steel is pure, P≤0.012%, S≤0.012%; (5) steel plate interior solid can satisfy the requirement of the S3E4 level non-destructive testing standard of EN10160; (6) steel plate thickness is big, and maximum ga(u)ge can reach 140mm.
The nuclear one-level key equipment of the present invention compactness height of steel plate, the intensity height, low-temperature impact toughness and high temperature tensile properties are good, anti-lamellar tearing performance, cold working and good welding performance, satisfy the requirement of nuclear power key equipment, can be applicable to the manufacturing of key equipments such as Nuclear power plants vaporizer, pressurized vessel.
Embodiment
Embodiment 1
The nuclear one-level key equipment of present embodiment is made up of following components in weight percentage content with steel plate: C 0.18%, Si 0.20%, Mn 1.40%, P 0.006%, S 0.002 %, Mo 0.50%, Ni 0.66%, Cr 0.15%, Al
Always0.030%, surplus is Fe and inevitably is mingled with.The nuclear one-level key equipment of present embodiment is 0.58% with the Ceq of steel plate, and the thickness of steel plate is 140mm.
The nuclear one-level key equipment of the present embodiment production method of steel plate, concrete steps are:
(1) smelts: adopt electric arc furnace smelting, send into the refining of LF refining furnace afterwards and adjust composition, in molten steel, add the Al line when molten steel temperature reaches 1500 ℃, change the vacuum degassing furnace vacuum-treat afterwards over to, vacuum treated vacuum tightness is 67Pa, 20 minutes vacuum hold-times;
(2) casting: the molten steel after the smelting is cast, and adopts continuous casting process, and superheating temperature is 10 ℃, and throwing speed is 1.05m/min, obtains continuously cast bloom;
(3) heating: continuously cast bloom is put into the continuous oven internal heating, and maximum heating temperature is 1240 ℃, and rate of heating is 17min/cm, and be 11min/mm total heat-up time;
(4) rolling: adopt II type controlled rolling process, be divided into two stages to be rolled, the fs is the austenite recrystallization stage, and rolling temperature is 1000 ℃, percentage pass reduction 10%, and the accumulative total draft is 30%; Subordinate phase is the non-recrystallize stage of austenite, and rolling temperature is 900 ℃, and the accumulative total draft is 50%; Obtain the work in-process steel plate after rolling;
(5) cooling: the work in-process steel plate adopts water-cooled, and returning red temperature is 650 ℃;
(6) modified: as to adopt quenching+tempering mode to carry out modified, the heat-eliminating medium that quenches is a water, quenching temperature is 950 ℃, soaking time PLC+30min, roller speed 1.5min/mm, pass through tempering after the quenching again, tempering temperature is 690 ℃, soaking time is 4.5min/mm, be rolled into the thick steel plate of 140mm afterwards, get the steel plate finished product, described steel plate finished product is made up of following components in weight percentage content: C 0.18%, Si 0.20%, Mn 1.40%, P 0.006%, S 0.002 %, Mo 0.50%, Ni 0.66%, Cr 0.15%, Al
Always0.030%, surplus is Fe and inevitably is mingled with.
The mechanical property of present embodiment steel plate: yield strength 525MPa, tensile strength 640MPa, A are 27%;-50 ℃ of ballistic work AKV(are horizontal) 101J, 98J, 105J ,-50 ℃ of ballistic work AKV(are vertical) 88J, 64J, 102J; Cold bending test (D=3.5a, 180o) result is intact; Yield strength 405MPa during 350 ℃ of drawing by high temperature, tensile strength 600MPa; Z:65%, 62%, 65%.
Embodiment 2
The nuclear one-level key equipment of present embodiment is made up of following components in weight percentage content with steel plate: C 0.15%, Si 0.20%, Mn 1.38%, P 0.006%, S 0.003 %, Mo 0.49%, Ni 0.67%, Cr 0.15%, Al
Always0.032%, surplus is Fe and inevitably is mingled with.The nuclear one-level key equipment of present embodiment is 0.55% with the Ceq of steel plate, and the thickness of steel plate is 50mm.
The nuclear one-level key equipment of the present embodiment production method of steel plate, concrete steps are:
(1) smelts: adopt electric arc furnace smelting, send into the refining of LF refining furnace afterwards and adjust composition, in molten steel, add the Al line when molten steel temperature reaches 1520 ℃, change the vacuum degassing furnace vacuum-treat afterwards over to, vacuum treated vacuum tightness is 60Pa, 60 minutes vacuum hold-times;
(2) casting: the molten steel after the smelting is cast, and obtains steel ingot;
(3) heating: described steel ingot is put into the soaking pit internal heating, and maximum heating temperature is 1230 ℃, 100 ℃/h of control rate of heating when temperature is lower than 1000 ℃, soaking time 500min;
(4) rolling: adopt II type controlled rolling process, be divided into two stages to be rolled, the fs is the austenite recrystallization stage, and rolling temperature is 1150 ℃, percentage pass reduction 15%, and the accumulative total draft is 50%; Subordinate phase is the non-recrystallize stage of austenite, and rolling temperature is 840 ℃, and the accumulative total draft is 70%; Obtain the work in-process steel plate after rolling;
(5) cooling: the work in-process steel plate adopts the stacking cooling, and stacking cooling total time is 35 hours;
(6) modified: as to adopt quenching+tempering mode to carry out modified, the heat-eliminating medium that quenches is a water, quenching temperature is 850 ℃, soaking time PLC+30min, roller speed 1.5min/mm, pass through tempering after the quenching again, tempering temperature is 600 ℃, soaking time is 3.0min/mm, be rolled into the thick steel plate of 50mm afterwards, get the steel plate finished product, described steel plate finished product is made up of following components in weight percentage content: C 0.15%, Si 0.20%, Mn 1.38%, P 0.006%, S 0.003 %, Mo 0.49%, Ni 0.67%, Cr 0.15%, Al
Always0.032%, surplus is Fe and inevitably is mingled with.
The mechanical property of present embodiment steel plate: yield strength 522MPa, tensile strength 624MPa, A are 25%;-20 ℃ of ballistic work AKV(are horizontal) 298J, 285J, 287J ,-20 ℃ of ballistic work AKV(are vertical) 267J, 278J, 265J; The result is intact for cold bending test (D=3.5a, 180 °); Yield strength 448MPa during 350 ℃ of drawing by high temperature, tensile strength 577MPa; Z:56%, 65%, 71%.
Embodiment 3
The nuclear one-level key equipment of present embodiment is made up of following components in weight percentage content with steel plate: C 0.13%, Si 0.10%, Mn 1.20%, P 0.008%, S 0.005 %, Mo 0.45%, Ni 0.60%, Cr 0.15%, Al
Always0.035%, surplus is Fe and inevitably is mingled with.The nuclear one-level key equipment of present embodiment is 0.50% with the Ceq of steel plate, and the thickness of steel plate is 110mm.
The nuclear one-level key equipment of the present embodiment production method of steel plate, concrete steps are:
(1) smelts: adopt electric arc furnace smelting, send into the refining of LF refining furnace afterwards and adjust composition, in molten steel, add the Al line when molten steel temperature reaches 1510 ℃, change the vacuum degassing furnace vacuum-treat afterwards over to, vacuum treated vacuum tightness is 65Pa, 40 minutes vacuum hold-times;
(2) casting: the molten steel after the smelting is cast, and adopts continuous casting process, and superheating temperature is 25 ℃, and throwing speed is 0.85m/min, obtains continuously cast bloom;
(3) heating: continuously cast bloom is put into the continuous oven internal heating, and maximum heating temperature is 1250 ℃, and rate of heating is 10min/cm, and be 11min/mm total heat-up time;
(4) rolling: adopt II type controlled rolling process, be divided into two stages to be rolled, the fs is the austenite recrystallization stage, and rolling temperature is 1100 ℃, percentage pass reduction 12%, and the accumulative total draft is 35%; Subordinate phase is the non-recrystallize stage of austenite, and rolling temperature is 860 ℃, and the accumulative total draft is 60%; Obtain the work in-process steel plate after rolling;
(5) cooling: the work in-process steel plate adopts water-cooled, and returning red temperature is 750 ℃;
(6) modified: as to adopt quenching+tempering mode to carry out modified, the heat-eliminating medium that quenches is a water, quenching temperature is 900 ℃, soaking time PLC+30min, roller speed 1.5min/mm, pass through tempering after the quenching again, tempering temperature is 630 ℃, soaking time is 3.5min/mm, be rolled into the thick steel plate of 110mm afterwards, get the steel plate finished product, described steel plate finished product is made up of following components in weight percentage content: C 0.13%, Si 0.10%, Mn 1.20%, P 0.008%, S 0.005 %, Mo 0.45%, Ni 0.60%, Cr 0.15%, Al
Always0.035%, surplus is Fe and inevitably is mingled with.
The mechanical property of present embodiment steel plate: yield strength 510MPa, tensile strength 640MPa, A are 26%;-50 ℃ of ballistic work AKV(are horizontal) 235J, 247J, 268J ,-50 ℃ of ballistic work AKV(are vertical) 278J, 256J, 285J; Cold bending test (D=3.5a, 180o) result is intact; Yield strength 480MPa during 350 ℃ of drawing by high temperature, tensile strength 590MPa; Z:78 %, 65 %, 70 %.
Embodiment 4
The nuclear one-level key equipment of present embodiment is made up of following components in weight percentage content with steel plate: C 0.20%, Si 0.13%, Mn 1.25%, P 0.010%, S 0.003 %, Mo 0.47%, Ni 0.70%, Cr 0.15%, Al
Always0.028%, surplus is Fe and inevitably is mingled with.The nuclear one-level key equipment of present embodiment is 0.58% with the Ceq of steel plate, and the thickness of steel plate is 80mm.
The nuclear one-level key equipment of the present embodiment production method of steel plate, concrete steps are:
(1) smelts: adopt electric arc furnace smelting, send into the refining of LF refining furnace afterwards and adjust composition, in molten steel, add the Al line when molten steel temperature reaches 1510 ℃, change the vacuum degassing furnace vacuum-treat afterwards over to, vacuum treated vacuum tightness is 61Pa, 35 minutes vacuum hold-times;
(2) casting: the molten steel after the smelting is cast, and obtains steel ingot;
(3) heating: described steel ingot is put into the soaking pit internal heating, and maximum heating temperature is 1250 ℃, 95 ℃/h of control rate of heating when temperature is lower than 1000 ℃, soaking time 300min;
(4) rolling: adopt II type controlled rolling process, be divided into two stages to be rolled, the fs is the austenite recrystallization stage, and rolling temperature is 1050 ℃, percentage pass reduction 11%, and the accumulative total draft is 45%; Subordinate phase is the non-recrystallize stage of austenite, and rolling temperature is 870 ℃, and the accumulative total draft is 58%; Obtain the work in-process steel plate after rolling;
(5) cooling: the work in-process steel plate adopts the stacking cooling, and stacking cooling total time is 24 hours;
(6) modified: as to adopt quenching+tempering mode to carry out modified, the heat-eliminating medium that quenches is a water, quenching temperature is 890 ℃, soaking time PLC+30min, roller speed 1.5min/mm, pass through tempering after the quenching again, tempering temperature is 650 ℃, soaking time is 3.6min/mm, be rolled into the thick steel plate of 80mm afterwards, get the steel plate finished product, described steel plate finished product is made up of following components in weight percentage content: C 0.20%, Si 0.13%, Mn 1.25%, P 0.010%, S 0.003 %, Mo 0.47%, Ni 0.70%, Cr 0.15%, Al
Always0.028%, surplus is Fe and inevitably is mingled with.
The mechanical property of present embodiment steel plate: yield strength 525MPa, tensile strength 640MPa, A are 25%;-50 ℃ of ballistic work AKV(are horizontal) 197J, 208J, 185J ,-50 ℃ of ballistic work AKV(are vertical) 224J, 214J, 245J; The result is intact for cold bending test (D=3.5a, 180 °); Yield strength 465 MPa during 350 ℃ of drawing by high temperature, tensile strength 590 MPa; Z:78%, 73%, 69%.
Claims (9)
1. examine one-level key equipment steel plate for one kind, it is characterized in that: form: 0＜C≤0.20%, Si:0.10-0.30%, Mn:1.20-1.60% by following components in weight percentage content, P≤0.012%, S≤0.012%, Mo:0.45-0.55%, Ni:0.50-0.80%, 0≤Cr≤0.25%, 0≤V≤0.03%, 0≤Cu≤0.20%, 0≤Al
Always≤ 0.040%, surplus is Fe and unavoidable impurities.
2. nuclear one-level key equipment steel plate according to claim 1, it is characterized in that: the weight percentage of described P, S is P≤0.008%, S≤0.005%.
3. nuclear one-level key equipment steel plate according to claim 2, it is characterized in that: described steel plate is made up of following components in weight percentage content: C:0.14-0.20%, Si:0.10-0.20%, Mn:1.20-1.40%, P≤0.006%, S≤0.003%, Mo:0.45-0.50%, Ni:0.60-0.70%, 0≤Cr≤0.25%, 0≤V≤0.03%, 0≤Cu≤0.20%, Al
Always: 0.030-0.035%, surplus is Fe and unavoidable impurities.
4. according to the arbitrary described nuclear one-level key equipment steel plate of claim 1～3, it is characterized in that: the thickness of described steel plate is 50-140mm.
5. examine the production method that the one-level key equipment is used steel plate for one kind, it is characterized in that: step is as follows:
(1) smelt: adopt electric arc furnace smelting, send into the refining of LF refining furnace afterwards and adjust composition, molten steel temperature changes the vacuum degassing furnace vacuum-treat over to when reaching 1510 ± 10 ℃;
(2) casting: the molten steel after the smelting is cast, and obtains strand, and described strand is continuously cast bloom or steel ingot;
(3) heating: described continuously cast bloom is at the continuous oven internal heating, and maximum heating temperature is 1240 ± 10 ℃, and rate of heating is 10-20min/cm, and be 11min/mm total heat-up time; Described steel ingot is at the soaking pit internal heating, and maximum heating temperature is 1240 ± 10 ℃, control rate of heating≤100 ℃/h when temperature is lower than 1000 ℃, soaking time 300-500min;
(4) rolling: adopt II type controlled rolling process, be divided into two stages to be rolled, the fs is the austenite recrystallization stage, and rolling temperature is 1000-1150 ℃, percentage pass reduction 〉=10%, and the accumulative total draft is 30-50%; Subordinate phase is the non-recrystallize stage of austenite, and rolling temperature is 840-900 ℃, and the accumulative total draft is 50-70%; Obtain the work in-process steel plate after rolling;
(5) cooling: the work in-process steel plate adopts water-cooled or stacking cooling, and the red temperature of returning during water-cooled is 650-750 ℃, and stacking cooling total time is 24-48 hour when adopting the stacking cooling;
(6) modified: as to adopt quenching+tempering mode to carry out modified, quenching temperature is 850-950 ℃, soaking time PLC+30min, roller speed 1.5min/mm passes through tempering again after the quenching, tempering temperature is 600-690 ℃, soaking time is 3.0-4.5min/mm, gets the steel plate finished product, and described steel plate finished product is made up of following components in weight percentage content: 0＜C≤0.20%, Si:0.10-0.30%, Mn:1.20-1.60%, P≤0.012%, S≤0.012%, Mo:0.45-0.55%, Ni:0.50-0.80%, 0≤Cr≤0.25%, 0≤V≤0.03%, 0≤Cu≤0.20%, 0≤Al
Always≤ 0.040%, surplus is Fe and unavoidable impurities.
6. nuclear one-level key equipment according to claim 5 is characterized in that: add the Al line in the step (1) in vacuum-treat forward direction molten steel with the production method of steel plate.
7. nuclear one-level key equipment according to claim 5 is characterized in that: the vacuum treated vacuum tightness≤67Pa described in the step (1), 20-60 minute vacuum hold-time with the production method of steel plate.
8. the nuclear one-level key equipment according to claim 5 production method of steel plate is characterized in that: continuous casting process is adopted in the casting described in the step (2), and superheating temperature is 10-25 ℃, and throwing speed is 0.85-1.15m/min.
9. the nuclear one-level key equipment according to claim 5 production method of steel plate is characterized in that: the heat-eliminating medium that quenches in the step (6) is a water.
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| CN2011101258924A CN102181804B (en) | 2011-05-16 | 2011-05-16 | Steel plate for Class I nuclear key equipment and manufacturing method thereof |
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| CN2011101258924A CN102181804B (en) | 2011-05-16 | 2011-05-16 | Steel plate for Class I nuclear key equipment and manufacturing method thereof |
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