CN110423942A - A kind of wide, think gauge midium-carbon steel plate and manufacturing method - Google Patents
A kind of wide, think gauge midium-carbon steel plate and manufacturing method Download PDFInfo
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- CN110423942A CN110423942A CN201910725047.7A CN201910725047A CN110423942A CN 110423942 A CN110423942 A CN 110423942A CN 201910725047 A CN201910725047 A CN 201910725047A CN 110423942 A CN110423942 A CN 110423942A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of wide, think gauge midium-carbon steel plate and manufacturing method, steel plate chemical component and mass percent are as follows: C:0.14%~0.16%, Si:0.20%~0.50%, Mn:1.1%~1.60%, P≤0.020%, S≤0.010%, Cr:0.10%~0.30%, Mo:0.10%~0.30%, Ni:0.30%~0.50%, Nb:0.015%~0.050%, V:0.030%~0.050%, Ti:0.008-0.030%, remaining is Fe and inevitable impurity.Yield strength >=415Mpa of steel plate, tensile strength 585-705Mpa, elongation after fracture are greater than 20%, -7 DEG C of low-temperature impact toughness >=68J, 150 DEG C of drawing by high temperature yield strength >=360MPa, 150 DEG C of tensile strength >=540MPa；Deliver goods the NDT of sample after state steel plate and PWHT: two Drop test pieces do not crack at -25 DEG C of test temperature.
Description
Technical field
The present invention relates to nuclear energy to manufacture field, and in particular to presurized water reactor containment steel plate.
Background technique
Nuclear energy is considered as one of following main energy sources as a kind of safe and clean, economic energy, with traditional firepower
Power generation is compared, and nuclear energy power generation safety is higher, while more more economical than thermoelectricity power generation.The construction of nuclear power station causes the wide of countries in the world
General concern, however the continuous of Nuclear Safety problem occurs so that more tight for nuclear power station design and the requirement of construction structure material
It is severe.
Nuclear power station steel safety shell is a sealing structure outside nuclear reactor, most prevents the last safety together of radiation
Barrier, to the safe important role of nuclear power station.In recent years in the construction of nuclear power station, steel are primary materials, are not only wanted
It asks with superior mechanical property, and requires good low-temperature impact toughness.
And the raising with nuclear technology of new generation to security requirement, steel plate thickness are gradually sent out to the direction of ultra-thick plate
Exhibition.Due to the secrecy and block of external nuclear power technology, being badly in need of carrying out has obdurability, the nuclear power steel SA738Gr.B's of ultra-thick plate
Research work.
Summary of the invention
The object of the invention is that provide it is a kind of it is wide, (general 60mm or more is slab, width 4000mm or more to think gauge
For wide plate) midium-carbon steel SA738Gr.B steel plate, thinking be in using carbon and the ingredient of alloying design, and by carbon, manganese,
The mutual cooperations of the microalloy elements such as the alloying elements such as chromium, nickel, molybdenum and copper and niobium, titanium, vanadium acts on, and auxiliary controlled rolling and from
Line heat-treating methods provide a kind of wide, think gauge midium-carbon steel SA738Gr.B steel plate method for manufacturing.
The present invention specifically adopts the following technical scheme that
A kind of wide, think gauge midium-carbon steel plate, which is characterized in that steel plate chemical component and mass percent are as follows: C:
0.12%~0.16%, Si:0.20%~0.50%, Mn:1.20%~1.60%, P≤0.010%, S≤0.003%, Cr:
0.10%~0.30%, Mo:0.20%~0.30%, Ni:0.30%~0.50%, Nb:0.015%~0.050%, V:
0.025%~0.050%, Ti:0.008-0.030%, remaining is Fe and inevitable impurity.
Yield strength >=415Mpa of the steel plate, tensile strength 585-705pa, elongation after fracture is greater than 20%, -7 DEG C
Low-temperature impact toughness >=68J, steel plate NDT: two Drop test pieces do not crack at -25 DEG C of test temperature；150 DEG C of drawing by high temperature surrenders
Intensity >=360MPa, 150 DEG C of tensile strength >=540MPa；；PWHT performance: meet yield strength >=415Mpa, tensile strength
585-705pa, elongation after fracture are greater than 20%, and -7 DEG C of low-temperature impact toughness >=68J, NDT: two fall at -25 DEG C of test temperature
Hammer sample does not crack.
Steel plate group is woven to bainite structure, is realized by Tempering and Quenching, and the present invention organizes crystal grain tiny, uniformly, has
Good mechanical property.
Wide, think gauge midium-carbon steel plate the manufacturing method, including following below scheme: desulfurizing iron pretreatment-converter smelting
Refining-LF+RH refining-continuous casting-slab heating-dephosphorization-rolling-is air-cooled-flaw detection-ball blast-quenching-tempering-aligning-cutting-sampling-
Spray printing mark-inspection-storage；It is characterized by:
Molten steel carries out continuous casting after Fruit storage, and slab is after 1180-1220 DEG C of heating in austenite recrystallization area
It is rolled respectively with Unhydrated cement；850~950 DEG C of finish rolling start rolling temperature, finish rolling stage total reduction >=55%, passage pressure
Lower rate >=10% increases drafts in Unhydrated cement, elongates austenite grain, increase the grain boundary area of austenite and subtract
The width of small deformation austenite grain；Cooling control after rolling carries out heat-treated offline after being air-cooled to room temperature, and wherein hardening heat is
880-920 DEG C, tempering temperature is 620-700 DEG C.
Steel plate component resolving:
Carbon: being one of most effective intensified element in steel.The C for being solid-solution in matrix can play significant solution strengthening effect,
But it will cause being decreased obviously for plastic toughness.C can improve the harden ability of steel, advantageously form high-intensitive microscopic structure, rise
To the effect of build up.It is also important that C is combined with carbide in steel such as Nb, V, Ti, Mo, it is being tempered
The important function of temper resistance and precipitation strength is played in the process.C content is too low not to have above-mentioned advantageous effect, excessively high then tight
Plastic toughness, especially weldability is damaged again to be deteriorated.Comprehensively consider, carbon element content of the invention be 0.12%~
0.16%.
Silicon: being common deoxidier in steel, it is therefore desirable to certain minimum content, and there is very strong solution strengthening energy
Power not will cause the deterioration of plasticity and toughness in certain range.In addition Si can also improve the anti-temper softening ability of steel, and energy
Inhibit the roughening of carbide precipitate to a certain extent.But when Si too high levels, the plasticity and toughness and weldability of material can be reduced.It is comprehensive
Consider the influence of element silicon various aspects, the content of element silicon of the present invention is 0.20-0.50%.
Manganese: it is most common alloying element in steel, is common deoxidier and desulfurizing agent.Mn can significantly improve the through hardening of steel
Property, in certain content and the toughness of tissue can be improved, but when content is high will damage plasticity and toughness and welding performance.A certain amount of Mn
Presence be avoided that hot-short caused by S, improve the performance of sulphide inculsion, but Mn content height is easy to produce axis segregation and band-like
Tissue.Comprehensively consider various influences of the manganese on the tissue of steel and performance, the content of manganese is 1.20%~1.60% in this material.
Sulphur and phosphorus: element sulphur easily forms vulcanization field trash with combinations such as manganese elements in steel, especially to the horizontal plastic property of steel
It is unfavorable with toughness, therefore the content of sulphur should be low as much as possible.Phosphorus is also the harmful element in steel, the serious plasticity for damaging steel plate and
Toughness.For the present invention, sulphur and phosphorus are inevitable impurity element, it should more lower better, it is contemplated that steel mill is practical
Steel-making it is horizontal, the present invention claims P≤0.010%, S≤0.003%.
Chromium: can improve the harden ability of steel, while can improve corrosion resistance and anti-hydrogen induced cracking ability, and can improve steel
Abrasion resistance properties.But Cr too high levels will lead to the degraded toughness of quenched and tempered steel, and damage the welding performance of steel.In this hair
In bright, the content of chromium should be controlled as 0.10-0.30%.
Molybdenum: can dramatically increase the harden ability of material, better effect when being especially used in conjunction with Nb, B.It is also important that Mo
Tiny carbide Mo2C can be formed during steel tempering, generates the effect of precipitation strength.But Mo content can excessively be damaged
The toughness and weldability of material, and lead to the increase of cost.In the present invention, molybdenum element content is 0.20-0.30%.
Nickel: nickel element is the element of stable austenite, and in quenched and tempered steel plus nickel element, the toughness that can greatly improve steel are outstanding
It is low-temperature flexibility.In the present invention, it in order to guarantee to obtain high intensity and hardness, is added in alloy design higher
Carbon, so that the toughness plasticity of steel plate can be made excessively poor.There is high intensity and hardness in order to guarantee steel plate both, but also have
Have certain toughness plasticity, while being additionally contemplates that nickel element belongs to expensive alloying elements, thus in the present invention nickel content are as follows:
0.30%~0.50%.
Niobium: niobium element can prevent to recrystallize in steel and recrystal grain is hindered to grow up, and improve intensity.Meanwhile niobium member
Element can consumingly form the carbide and nitride of niobium in steel, to influence the performance of steel, and niobium element can refine crystal grain and
Reduce the superheated susceptivity and temper brittleness of steel.In the present invention, the content control of niobium element is 0.015-0.050%.
Vanadium: carbide when V, these nanoscales V (C, N) Dispersed precipitate can play in the matrix of steel
The effect of precipitation strength improves the intensity of steel plate.In addition, during heating austenite grain can be prevented with pinning crystal boundary
It grows up, plays the role of refining crystal grain.But V content it is excessively high when, becoming large-sized for precipitation particles is unfavorable to toughness instead, because
This controls the content of V 0.025%~0.050%.
Titanium: titanium energy deoxidation refines crystal grain；Reinforced ferrite；Carbide is formed, the area γ is reduced；Make austenite isothermal transformation
Figure moves to right；Reduce superheated susceptivity；Harden ability is improved when being dissolved in solid solution, reduces harden ability when forming carbide；Form carbonization
Postpone tempering temperature when object, can be tempered at relatively high temperatures；Improving welding property.Ti content control of the present invention is in 0.008-
0.030%.
Beneficial effects of the present invention:
1. the steel plate that the present invention obtains intensity with higher, yield strength >=415Mpa, tensile strength 585-705pa,
Elongation after fracture is greater than 20%, -7 DEG C of low-temperature impact toughness >=68J.
2. the steel plate that the present invention obtains have good high temperature tensile strength, 150 DEG C of drawing by high temperature yield strength >=360MPa,
150 DEG C of tensile strength >=540MPa
3. steel plate NDT: two Drop test pieces do not crack at -25 DEG C of test temperature；
4. the steel plate that the present invention obtains has good PWHT performance, meet yield strength >=415Mpa, tensile strength
585-705pa, elongation after fracture are greater than 20%, and -7 DEG C of low-temperature impact toughness >=68J, NDT: two fall at -25 DEG C of test temperature
Hammer sample does not crack.
5. the present invention is produced by the way of TMCP (it is cold that control is pricked in control) and heat-treated offline, simple production process.
Detailed description of the invention
Fig. 1 is steel plate organization chart of the present invention.
Specific embodiment
By the chemical component requirement of steel grade of the present invention, and in conjunction with the manufacturing process, to manufacture thickness 101mm width
4300mm wide, think gauge SA738Gr.B steel plate.Specific ingredient is as follows:
The chemical component (wt%) of 1 various embodiments of the present invention of table
The steel billet smelted carries out thickness by the method, using the method that controlled rolling and heat-treated offline combine
101mm width 4300mm wide, think gauge SA738Gr.B steel plate
Embodiment 1
Continuous casting is carried out after Fruit storage by the molten steel smelted and completed is matched by table 1, thickness of strand 320mm will
The furnace temperature of heating steel billet to 1180 DEG C comes out of the stove after time inside furnace 355min and carries out the rolling of austenite recrystallization area respectively and do not tie again
Crystalline region rolling, 850~950 DEG C of finish rolling start rolling temperature, wherein recrystallization zone finishing temperature is 1030 DEG C, Unhydrated cement finish to gauge temperature
Degree is 830 DEG C, and the final rolling thickness of steel plate is 101mm, and percentage pass reduction >=10% is air-cooled to room temperature, then carries out after rolling
Quenching and tempering, hardening heat are 900 DEG C, and tempering temperature is 680 DEG C.
Embodiment 2
Continuous casting is carried out after Fruit storage by the molten steel smelted and completed is matched by table 1, thickness of strand 320mm will
The furnace temperature of heating steel billet to 1200 DEG C comes out of the stove after time inside furnace 335min and carries out the rolling of austenite recrystallization area and Unhydrated cement
Rolling, 850~950 DEG C of finish rolling start rolling temperature, wherein recrystallization zone finishing temperature is 1035 DEG C, and Unhydrated cement finishing temperature is
850 DEG C, the final rolling thickness of steel plate is 101mm, and percentage pass reduction >=10% is air-cooled to room temperature, is then quenched after rolling
And tempering, hardening heat are 905 DEG C, tempering temperature is 685 DEG C.
Embodiment 3
Continuous casting is carried out after Fruit storage by the molten steel smelted and completed is matched by table 1, thickness of strand 320mm will
The furnace temperature of heating steel billet to 1220 DEG C comes out of the stove after time inside furnace 345min and carries out the rolling of austenite recrystallization area and Unhydrated cement
Rolling, 850~950 DEG C of finish rolling start rolling temperature, wherein recrystallization zone finishing temperature is 1040 DEG C, and Unhydrated cement finishing temperature is
845 DEG C, the final rolling thickness of steel plate is 101mm, and percentage pass reduction >=10% is air-cooled to room temperature, is then quenched after rolling
And tempering, hardening heat are 900 DEG C, tempering temperature is 690 DEG C.
The mechanical property of steel plate in embodiment is tested, wherein intensity is according to GB/T228-2002 metal material room
Warm stretching test method carries out, and low-temperature impact toughness is surveyed by GB/T 229-2007 metal Charpy V test method
Fixed, what is obtained the results are shown in Table shown in 2.
The mechanical property of the steel plate of the present invention of table 2
As can be seen from Table 2, present invention width, think gauge midium-carbon steel SA738Gr.B meet yield strength >=415Mpa, resist
Tensile strength 585-705pa, elongation after fracture are greater than 20%, -7 DEG C of low-temperature impact toughness >=68J, steel plate NDT: test temperature -25
DEG C when two Drop test pieces do not crack；150 DEG C of drawing by high temperature yield strength >=360MPa, 150 DEG C of tensile strength >=540MPa；
NDT: two Drop test pieces do not crack at -25 DEG C of test temperature.It can be seen that high-strength steel of the present invention have superelevation intensity and
Good extensibility, while also there are preferable low-temperature impact toughness and high temperature tensile properties.
PWHT (post weld heat treatment) technique: 620 ± 10 DEG C of holding temperature, soaking time: 15h, temperature are greater than 425 DEG C, add
Hot cooling rate is 56 DEG C/h.
The PWHT performance of the steel plate of the present invention of table 3
As can be seen from Table 3, it is strong that the present invention is wide, think gauge midium-carbon steel SA738Gr.B steel plate PWHT performance meets surrender
Degree >=415Mpa, tensile strength 585-705pa, elongation after fracture are greater than 20%, -7 DEG C of low-temperature impact toughness >=68J,
The ingredient design of carbon, low Ceq, low Pcm in present invention use, guarantee the good welding performance of steel plate and mechanical property
Can, using quenching-and-tempering process, steel plate has good straightness.
Although illustrate and describing the present invention with specific embodiment, it will be appreciated that without departing substantially from of the invention
Many other change and modification can be made in the case where spirit and scope.It is, therefore, intended that in the following claims
Including belonging to all such changes and modifications in the scope of the invention.
Claims (7)
1. a kind of wide, think gauge midium-carbon steel plate, which is characterized in that steel plate chemical component and mass percent are as follows: C:0.12%
~0.16%, Si:0.20%~0.50%, Mn:1.20%~1.60%, P≤0.010%, S≤0.003%, Cr:0.10%~0.30%,
Mo:0.20%~0.30%, Ni:0.30%~0.50%, Nb:0.015%~0.050%, V:0.025%~0.050%, Ti:0.008-
0.030%, remaining is Fe and inevitable impurity.
2. as described in claim 1 wide, think gauge midium-carbon steel plate, which is characterized in that steel plate with a thickness of 101mm, steel plate
Width be 4300mm.
3. wide, think gauge midium-carbon steel plate as described in claim 1, which is characterized in that yield strength >=415Mpa of steel plate,
Tensile strength 585-705pa, elongation after fracture are greater than 20%, -7 DEG C of low-temperature impact toughness >=68J, steel plate NDT: test temperature -25
DEG C when two Drop test pieces do not crack；150 DEG C of drawing by high temperature yield strength >=360MPa, 150 DEG C of tensile strength >=540MPa.
4. wide, think gauge midium-carbon steel plate as described in claim 1, which is characterized in that steel plate PWHT performance: it is strong to meet surrender
Degree >=415Mpa, tensile strength 585-705pa, elongation after fracture are greater than 20%, -7 DEG C of low-temperature impact toughness >=68J, NDT: examination
Two Drop test pieces do not crack when testing -25 DEG C of temperature.
5. wide, think gauge midium-carbon steel plate as described in claim 1, which is characterized in that steel plate group is woven to bainite structure.
6. such as any wide, think gauge midium-carbon steel plate the manufacturing method of claim 1 ~ 5, including following below scheme: molten iron is de-
Sulphur pretreatment-converter smelting-LF+RH refining-continuous casting-slab heating-dephosphorization-rolling-is air-cooled-flaw detection-ball blast-quenching-tempering-
Aligning-cutting-sampling-spray printing mark-inspection-storage；It is characterized by:
Molten steel carries out continuous casting after Fruit storage, slab after 1180-1220 DEG C of heating in austenite recrystallization area and not
Recrystallization zone is rolled respectively；850~950 DEG C of finish rolling start rolling temperature, finish rolling stage total reduction >=55%, percentage pass reduction
>=10%, increase drafts in Unhydrated cement, elongate austenite grain, increases the grain boundary area of austenite and reduce change
The width of shape austenite grain；Cooling control after rolling carries out heat-treated offline after being air-cooled to room temperature, and wherein hardening heat is 880-920
DEG C, tempering temperature is 620-700 DEG C.
7. manufacturing method as claimed in claim 6, it is characterised in that the slab thickness of continuous casting is 320mm.
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| CN110791712A (en) * | 2019-11-15 | 2020-02-14 | 南京钢铁股份有限公司 | SA738GrB steel plate for nuclear power station containment vessel and manufacturing method |
| CN111321349A (en) * | 2020-03-30 | 2020-06-23 | 南京钢铁股份有限公司 | 130mm containment nuclear power steel and continuous casting billet low-compression-ratio manufacturing method thereof |
| CN114875309A (en) * | 2022-04-08 | 2022-08-09 | 鞍钢股份有限公司 | Steel for thick-specification high-strength nuclear reactor containment vessel and manufacturing method thereof |
| CN116044145A (en) * | 2022-12-20 | 2023-05-02 | 安阳融达实业有限公司 | High-strength building light steel alloy template |
| CN116987968A (en) * | 2023-07-26 | 2023-11-03 | 鞍钢股份有限公司 | Extreme-wide-specification nuclear power steel plate for high-temperature gas cooled reactor pressing plate component and preparation method |
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| CN110791712A (en) * | 2019-11-15 | 2020-02-14 | 南京钢铁股份有限公司 | SA738GrB steel plate for nuclear power station containment vessel and manufacturing method |
| CN111321349A (en) * | 2020-03-30 | 2020-06-23 | 南京钢铁股份有限公司 | 130mm containment nuclear power steel and continuous casting billet low-compression-ratio manufacturing method thereof |
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Effective date of registration: 20210917 Address after: Liuhe District of Nanjing City, Jiangsu province 210035 xiejiadian Applicant after: NANJING IRON & STEEL Co.,Ltd. Applicant after: Northeastern University Address before: Liuhe District of Nanjing City, Jiangsu province 210035 xiejiadian Applicant before: NANJING IRON & STEEL Co.,Ltd. |
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Application publication date: 20191108 |