CN103695809A - Travel sleeve of control rod drive mechanism for nuclear power plant and preparation method thereof - Google Patents
Travel sleeve of control rod drive mechanism for nuclear power plant and preparation method thereof Download PDFInfo
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- CN103695809A CN103695809A CN201310688005.3A CN201310688005A CN103695809A CN 103695809 A CN103695809 A CN 103695809A CN 201310688005 A CN201310688005 A CN 201310688005A CN 103695809 A CN103695809 A CN 103695809A
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Abstract
The invention discloses a preparation method of a travel sleeve of a control rod drive mechanism for a nuclear power plant. The preparation method comprises the following steps: 1) selecting raw materials and obtaining molten steel through electric furnace smelting, AOD refining and LF furnace refining; 2) casting the molten steel into an electrode; 3) carrying out electroslag remelting on the electrode to obtain a steel ingot, wherein in percentage by weight, the steel ingot comprises not more than 0.035% of C, not more than 1.00% of Si, not more than 2.00% of Mn, not more than 0.030% of P, not more than 0.015% of S, 18.50-20.00% of Cr, 9.00-10.00% of Ni, not more than 0.080% of N, not more than 1.00% of Cu, not more than 0.10% of Co, not more than 0.001% of B, not more than 0.05% of Al and the balance of Fe; 4) forging the steel ingot and machining the steel ingot after thermal treatment; 5) obtaining the travel sleeve of the control rod drive mechanism for the nuclear power plant after magnetic performance test and non-destructive test are performed. The travel sleeve of the control rod drive mechanism for the nuclear power plant can satisfy the mechanical property and function requirements of the practical use, and the life satisfies the design specification and national standard requirements. Through measurement of magnetic permeability point by point, the relative magnetic permeability is controlled to be below 1.02.
Description
Technical field
The invention belongs to nuclear power technology field, more particularly, the present invention relates to a kind of Nuclear power plants rod drive mechanism stroke sleeve pipe and preparation method thereof.
Background technology
Nuclear Power Station safety class equipment--rod drive mechanism (CRDM) is mechanical means important in nuclear power plant reactor system; some as reactor control and protection system; CRDM is extremely important topworks, and its major function is to drive the control rod startup of upper and lower motion realization response heap, hoisting power, maintenance power, Steam Generator in Load Follow, normal shutdown and breakdown in reactor core.
Pressurized-water reactor nuclear power plant CRDM stroke sleeve pipe is the some of the pressure bearing and seal part of magnetic control rod drive mechanism, be operated in the environment of Nuclear power plants one loop high-temperature high pressure water, not only to provide for the motion of drive-rod part stroke space, location and the supporting structure of also serving as stick location probe parts.In order to guarantee the accurate of ferromagnetic bar location probe indication, after requiring stick location probe coil energising, stroke sleeve pipe is nonmagnetic, therefore require the material of stroke sleeve pipe to there is the mechanical property of high temperature high voltage resistant, pure austenite structure, nonmagnetic and corrosion-resistant, belong to core one-level component.
CRDM stroke sleeve pipe is monopolized by external a few countries for a long time, and their long-term control the CRDM stroke sleeve pipe supply of material market of global nuclear power projects.The external minority CRDM device fabrication producer supply of material that places one's entire reliance upon, China not only needs to pay more expensive purchase cost, and delivery cycle is uncertain, has a big risk, and once has influence in various degree the duration progress of China Jian nuclear power new projects.
In view of this, necessary a kind of Nuclear power plants rod drive mechanism stroke sleeve pipe and preparation method thereof that provides.
Summary of the invention
Goal of the invention of the present invention is: a kind of Nuclear power plants rod drive mechanism stroke sleeve pipe and preparation method thereof is provided.
In order to realize foregoing invention object, the invention provides a kind of preparation method of Nuclear power plants rod drive mechanism stroke sleeve pipe, it comprises the following steps:
1) choose raw material and by the refining of electrosmelting+AOD refining+LF stove, obtain molten steel;
2) pouring molten steel is become to electrode;
3) electrode esr is obtained to steel ingot, wherein, by weight percentage, contain≤0.035%C of steel ingot ,≤1.00%Si ,≤2.00%Mn ,≤0.030%P ,≤0.015%S, 18.50～20.00%Cr, 9.00～10.00%Ni ,≤0.080%N ,≤1.00%Cu ,≤0.10%Co ,≤0.001%B ,≤0.05%Al and surplus Fe;
4) forging steel ingot blank, carries out machining after thermal treatment; And
5) after magnetic property check, nondestructive testing, obtain Nuclear power plants rod drive mechanism stroke sleeve pipe.
As a kind of improvement of preparation method of the present invention, step 1) in, described raw material adopts high carbon ferro-chrome, medium carbon ferrochrome, nickel plate, low P raw material, manganese metal, contains nitrogenous ferrochrome, ferrosilicon.
As a kind of improvement of preparation method of the present invention, step 2) in, described in be cast in argon shield atmosphere and carry out.
As a kind of improvement of preparation method of the present invention, step 3) carry out before, electrode surface is cleared up.
As a kind of improvement of preparation method of the present invention, step 3) carry out after, the steel ingot of the demoulding is carried out to surface finish.
As a kind of improvement of preparation method of the present invention, step 4) in, after described Heating Steel Ingots insulation, adopt fast forging cogging and footpath to be forged into blank.
A kind of improvement as preparation method of the present invention, described Heating Steel Ingots heat preservation method is: steel ingot is slowly heated to 900-1000 ℃ from≤700 ℃, 900-1000 ℃ of insulation, after 2 hours, be slowly heated to again 1000-1100 ℃, after 1000-1100 ℃ of insulation 2 hours, the forging of coming out of the stove.
As a kind of improvement of preparation method of the present invention, while carrying out described fast forging cogging, by steel ingot jumping-up secondary or repeatedly, after jumping-up insulation, steel billet is come out of the stove and pull out forging, through repeatedly after forging, steel billet being swaged into required intermediate blank size, excises the exterior part of ingot, tail after cogging.
As a kind of improvement of preparation method of the present invention, described steel billet is forged the temperature 1100 ℃ of > in process furnace and is heated 2.5-4.5 hour in footpath, insulation 1.5-2.5 hour, and steel billet is forged into required intermediate blank size after coming out of the stove on footpath forging machine.
As a kind of improvement of preparation method of the present invention, step 4) after, forging blank is carried out to solution treatment.
As a kind of improvement of preparation method of the present invention, described solution treatment is: forging steel billet is heated to 1000 ℃ of > from≤650 ℃, is incubated water-cooled to billet surface temperature after >=2.5 hours and is less than 40 ℃.
As a kind of improvement of preparation method of the present invention, by choosing raw material and adding alloy material, obtain step 3) in the composition of steel ingot.
In order to realize foregoing invention object, the present invention also provides a kind of Nuclear power plants rod drive mechanism stroke sleeve pipe, by weight percentage, described contain≤0.035%C of Nuclear power plants rod drive mechanism stroke sleeve pipe ,≤1.00%Si ,≤2.00%Mn ,≤0.030%P ,≤0.015%S, 18.50～20.00%Cr, 9.00～10.00%Ni ,≤0.080%N ,≤1.00%Cu ,≤0.10%Co ,≤0.001%B ,≤0.05%Al and surplus Fe.
As a kind of improvement of Nuclear power plants rod drive mechanism stroke sleeve pipe of the present invention, described Nuclear power plants rod drive mechanism stroke sleeve pipe obtains by aforementioned preparation method.
With respect to prior art, Nuclear power plants rod drive mechanism stroke sleeve pipe of the present invention and preparation method thereof has the following advantages:
The control of Chemical Composition in optimization by Chemical Composition and manufacturing processed, CRDM stroke sleeve pipe can reach mechanical property and functional requirement of actual use, and the life-span meets design specifications and the national standard requirement of CRDM.In addition, point-to-point measurement magnetic permeability, relative magnetic permeability can be controlled in below 1.02.Through reality, detect, be arranged on indices excellent property while moving in CRDM, safe and reliable.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, Nuclear power plants rod drive mechanism stroke sleeve pipe of the present invention and preparation method thereof is elaborated, wherein:
Fig. 1 is the fast cogging heating process graphic representation of forging in the preparation method of Nuclear power plants rod drive mechanism stroke sleeve pipe of the present invention.
Fig. 2 is the process curve figure of blank solution treatment in the preparation method of Nuclear power plants rod drive mechanism stroke sleeve pipe of the present invention.
Fig. 3 is the inclusion shape appearance figure of the sample that obtains of the preparation method of the Nuclear power plants rod drive mechanism stroke sleeve pipe according to the present invention.
Fig. 4 is the α phase shape appearance figure of the sample that obtains of the preparation method of the Nuclear power plants rod drive mechanism stroke sleeve pipe according to the present invention.
Fig. 5 is metallographic structure, the grain fineness number shape appearance figure of the sample that obtains of the preparation method of the Nuclear power plants rod drive mechanism stroke sleeve pipe according to the present invention.
Embodiment
In order to make goal of the invention of the present invention, technical scheme and technique effect thereof more clear, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be understood that, the embodiment describing in this specification sheets is only in order to explain the present invention, is not intended to limit the present invention.
The preparation method's of Nuclear power plants rod drive mechanism stroke sleeve pipe of the present invention technical process comprises: picking of raw material → electrosmelting+AOD refining+LF stove refining → casting electrode → surface finish → esr → rough forging → thermal treatment → sampling → physicochemical property check → machining → magnetic property check → nondestructive testing → size, surface quality testing.
1. picking of raw material: raw material adopts high carbon ferro-chrome, medium carbon ferrochrome, nickel plate, low P raw material, manganese metal, containing nitrogenous ferrochrome, ferrosilicon.
2. electrosmelting+AOD refining+LF stove refining: raw material melts in electric furnace, then molten steel is poured into oxygen decarburization, nitrogen flushing in AOD refining furnace, added alloy material, adjust chemical composition, after reaching the target component of process for making regulation and stipulation and liquid steel temperature, tap, molten steel is poured ladle into.
Ladle moves into LF refining furnace and carries out refining for the second time, according to on-the-spot sample analysis result, adds alloy material to adjust chemical composition, adjusts liquid steel temperature simultaneously, until molten steel, reaches after meeting the target chemical composition of process for making code requirement and tapping temperature and taps.
3. casting electrode: not to be oxidized in order protecting in molten steel casting process, few oxidation, to adopt argon shield casting.
4. esr: in order to improve the metallurgical quality of steel, carry out esr secondary smelting, obtain steel ingot.By esr, can improve the purity of steel, reduce steel inclusion, reduce the size of inclusion, the distribution of change inclusion.
Before esr, electrode surface is first cleared up, remove surface scale.In addition,, in order to remove moisture in slag charge, before use, can adopt resistance furnace baking slag charge.
During esr, adopt CaF
2: Al
2o
3: CaO:MgO quaternary slag system, adopt the general electroslag remelting process of stainless steel, by controlling voltage and current, guarantee that esr process steadily carries out.
In order to guarantee that the tissue of steel meets the demands, the main alloy element of steel is carried out to the control of target composition, the main alloy element content of steel sees the following form 1.
The main alloy element content (weight percent) of table 1 steel
| Element | C | Si | Mn | P | S | Cr | Ni | N |
| Content | ≤0.035 | ≤1.00 | ≤2.00 | ≤0.030 | ≤0.015 | 18.50～20.00 | 9.00～10.00 | ≤0.080 |
| Element | Cu | Co | B | Al | Fe | ? | ? | ? |
| Content | ≤1.00 | ≤0.10 | ≤0.0010 | ≤0.050 | Surplus | ? | ? | ? |
5. surface finish: steel ingot demoulding rear surface finishing, remove ingot surface defect.
6. rough forging: steel ingot adopts fast forgings+footpath to forge combination forging process, adopts fast forging cogging after Heating Steel Ingots insulation, then forge to finished product blank in footpath.
Heating Steel Ingots heats by Fig. 1 technique in batch-type furnace: steel ingot is slowly heated to 900-1000 ℃ from≤700 ℃, 900-1000 ℃ of insulation, within 2 hours, is slowly heated to 1000-1100 ℃ again; After 1000-1100 ℃ of insulation 2 hours, the forging of coming out of the stove.
Fast forging cogging, steel ingot carries out cogging on 2000 tons of high-speed hydranlic press.
In order to guarantee that rod iron has good tissue to meet mechanical property and flaw detection requirement, steel ingot jumping-up secondary during forging, after jumping-up insulation, steel billet is come out of the stove and is pulled out forging, and after repeatedly forging, steel billet is forged required intermediate blank size.
After cogging, excise the exterior part of ingot, tail, forge compression ratio and be greater than 5, steel billet cooling rear surface finishing, removes steel billet surface defect.
Forge in footpath: steel billet is forged in process furnace and heated in footpath.1100 ℃ of Heating temperature >, heating 2.5-4.5 hour, insulation 1.5-2.5 hour, steel billet is swaged to blank dimension after coming out of the stove on 1300 tons of footpath forging machines.
7. thermal treatment (solution treatment): forging blank carries out solution treatment by Fig. 2.Forging blank is heated to 1000 ℃ of > from≤650 ℃, is incubated and after 2.5 hours, carries out water-cooled (as blank is hung in tank), be less than 40 ℃ to blank surface temperature.
8. sampling and physicochemical property check: obtain sample from blank and test detection, to determine whether blank meets performance requriements and the Functional Requirement of regulation, specifically referring to experiment test section.
9. machining → magnetic property check → nondestructive testing → size, surface quality testing: the stroke sleeve pipe that the steel billet that meets survey requirement is machined to as requested to predetermined size; By the detection of row magnetic property, nondestructive testing and size, surface quality testing, can obtain the Nuclear power plants rod drive mechanism stroke sleeve pipe that meets design specifications and national standard requirement.
Experiment detects
1. the examination of nonmetallic inclusion
By GB/T10561-2005, carry out the examination of nonmetallic inclusion: get stroke sleeve pipe blank 1/2 radius vertical section sample and grind after polishing, check under the microscope non-metallic inclusion, non-metallic inclusion pattern is shown in Fig. 3, and assay is in Table 2.
Table 2 examination of nonmetallic inclusion result
2. α checks mutually
By GB/T13305-2008, carrying out α checks mutually: get vertical section, stroke sleeve pipe blank center sample and grind after polishing, by basic iron potassium cyanide aqueous corrosion check α phase.α checks mutually centered by the most serious visual field, measures the ferrite content of adjacent 5 visual fields and quotes, and α phase pattern is shown in Fig. 4, and assay is in Table 3.
Table 3 α phase assay
3. grain fineness number grading
By GB/T6394-2002, carry out grain fineness number grading: get stroke sleeve pipe blank 1/2 radius cross section sample and grind after polishing, with 10% oxalic acid aqueous solution electrolytic corrosion, check grain fineness number.Grain fineness number pattern is shown in Fig. 5, and grain fineness number is rated 3.0 grades.
4. Huey test
By RCCC-M MC1310, carry out Huey test: get 2 of stroke sleeve pipe blank 1/2 radius longitudinal test pieces, to after surface finish, according to RCC-M MC1310 method B, carry out sensitization processing, sample after sensitization adds copper scale corrosion 24 hours, 90-degree bent, 2 samples of assay are all inclined to without intergranular corrosion.
5. tension test
By GB/T228.1-2010, carry out room temperature tensile, by GB/T4338-2006, carry out 350 ℃ of stretchings: in stroke sleeve pipe blank 1/2 radial position, get 6 of hoop tension specimens, carry out room temperature and 350 ℃ of high temperature tension tests, sample working portion diameter is Φ 10mm, and stretch test result is in Table 4.
Table 4 stretch test result
6. low temperature impact test
By GB/T229-2007, carry out 0 ℃ of low temperature impact test: in stroke sleeve pipe blank 1/2 radial position, get 3 of hoop impact specimens, carry out 0 ℃ of low temperature impact test, sample adopts 10mm * 10mm * 55mm standard v-notch sample, breach axis is perpendicular to blank outside surface, and Impulse Test Result is in Table 5.
Table 5 low temperature impact test result
From above experiment, detect and can find out, Nuclear power plants rod drive mechanism stroke sleeve pipe of the present invention has the mechanical property of desirable high temperature resistant, high pressure; There is pure austenite structure, point-to-point measurement magnetic permeability, relative magnetic permeability can be controlled in below 1.02; Corrosion-resistant, can meet design specifications and national standard requirement.
In conjunction with above detailed description and actual survey, Nuclear power plants rod drive mechanism stroke sleeve pipe of the present invention and preparation method thereof has following technique effect:
1. realize the production domesticization of CRDM stroke cover pipe manufacturer, broken foreign technology monopolization, there is very high Social benefit and economic benefit;
2. by the optimum combination of Chemical Composition, in process for making, guarantee the control of composition, CRDM stroke sleeve pipe can reach mechanical property and functional requirement, and the life-span meets design specifications and the national standard requirement of CRDM, and quality reaches the advanced level of same kind of products at abroad;
3. can utilize domestic existing processing unit processing and manufacturing, be suitable for batch production;
4. adopt the refining of electric furnace+AOD refining+LF stove, in smelting process, the strict optimization proportioning of controlling chemical composition is to stop ferrite to be separated out, and through point-to-point measurement magnetic permeability, relative magnetic permeability is controlled at below 1.02;
5. through actual survey, be arranged on indices excellent property while moving in equipment CRDM, guarantee safe and reliable.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and modification to above-mentioned embodiment.Therefore, the present invention is not limited to embodiment disclosed and described above, to modifications and changes more of the present invention, also should fall in the protection domain of claim of the present invention.In addition,, although used some specific terms in this specification sheets, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (14)
1. a preparation method for Nuclear power plants rod drive mechanism stroke sleeve pipe, is characterized in that, comprises the following steps:
1) choose raw material and by the refining of electrosmelting+AOD refining+LF stove, obtain molten steel;
2) pouring molten steel is become to electrode;
3) electrode esr is obtained to steel ingot, wherein, by weight percentage, contain≤0.035%C of steel ingot ,≤1.00%Si ,≤2.00%Mn ,≤0.030%P ,≤0.015%S, 18.50～20.00%Cr, 9.00～10.00%Ni ,≤0.080%N ,≤1.00%Cu ,≤0.10%Co ,≤0.001%B ,≤0.05%Al and surplus Fe;
4) forging steel ingot blank, carries out machining after thermal treatment; And
5) after magnetic property check, nondestructive testing, obtain Nuclear power plants rod drive mechanism stroke sleeve pipe.
2. preparation method according to claim 1, is characterized in that step 1) in, described raw material adopts high carbon ferro-chrome, medium carbon ferrochrome, nickel plate, low P raw material, manganese metal, contains nitrogenous ferrochrome, ferrosilicon.
3. preparation method according to claim 1, is characterized in that step 2) in, described in be cast in argon shield atmosphere and carry out.
4. preparation method according to claim 1, is characterized in that step 3) carry out before, electrode surface is cleared up.
5. preparation method according to claim 1, is characterized in that step 3) carry out after, the steel ingot of the demoulding is carried out to surface finish.
6. preparation method according to claim 1, is characterized in that step 4) in, after described Heating Steel Ingots insulation, adopt fast forging cogging and footpath to be forged into blank.
7. preparation method according to claim 6, is characterized in that, the technique of described Heating Steel Ingots insulation is: steel ingot is slowly heated to 900-1000 ℃ from≤700 ℃, 900-1000 ℃ of insulation, within 2 hours, is slowly heated to 1000-1100 ℃ again; After 1000-1100 ℃ of insulation 2 hours, the forging of coming out of the stove.
8. preparation method according to claim 7, is characterized in that, while carrying out described fast forging cogging, by steel ingot jumping-up secondary or repeatedly, after jumping-up insulation, steel billet is come out of the stove and is pulled out forging, after repeatedly forging, steel billet is swaged into required intermediate blank size, excises the exterior part of ingot, tail after cogging.
9. preparation method according to claim 8, it is characterized in that, described steel billet is forged the temperature 1100 ℃ of > in process furnace and is heated 2.5-4.5 hour in footpath, insulation 1.5-2.5 hour, and steel billet is forged into required intermediate blank size after coming out of the stove on footpath forging machine.
10. preparation method according to claim 1, is characterized in that step 4) after, forging blank is carried out to solution treatment.
11. preparation methods according to claim 10, is characterized in that, described solution treatment is: forging steel billet is heated to 1000 ℃ of > from≤650 ℃, is incubated water-cooled to billet surface temperature after >=2.5 hours and is less than 40 ℃.
12. preparation methods according to claim 1, is characterized in that, by choosing raw material and adding alloy material, obtain step 3) in the composition of steel ingot.
13. 1 kinds of Nuclear power plants rod drive mechanism stroke sleeve pipes, it is characterized in that, by weight percentage, described contain≤0.035%C of Nuclear power plants rod drive mechanism stroke sleeve pipe ,≤1.00%Si ,≤2.00%Mn ,≤0.030%P ,≤0.015%S, 18.50～20.00%Cr, 9.00～10.00%Ni ,≤0.080%N ,≤1.00%Cu ,≤0.10%Co ,≤0.001%B ,≤0.05%Al and surplus Fe.
14. Nuclear power plants rod drive mechanism stroke sleeve pipes according to claim 13, is characterized in that, described Nuclear power plants rod drive mechanism stroke sleeve pipe obtains by the preparation method described in any one in claim 1-12.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105088094A (en) * | 2015-08-11 | 2015-11-25 | 宝钢特钢有限公司 | Manufacturing method of nitrogen-controlled austenitic stainless steel large forging piece |
| WO2016115821A1 (en) * | 2015-01-23 | 2016-07-28 | 李泽文 | Nickel-based alloy pressure-resistant shell and implementation method thereof |
| CN106191981A (en) * | 2016-08-26 | 2016-12-07 | 中航动力股份有限公司 | A kind of caustic solution of high-temperature alloy blades surface depleted layer |
| CN110935827A (en) * | 2019-12-02 | 2020-03-31 | 抚顺特殊钢股份有限公司 | Forging method of large-specification fine-grain austenitic gas valve steel SNCrW |
| CN110964990A (en) * | 2019-11-11 | 2020-04-07 | 南京工程学院 | High-performance large-diameter thick-wall austenitic stainless steel forged pipe for nuclear power and short-process preparation method thereof |
| CN114250402A (en) * | 2021-12-16 | 2022-03-29 | 大冶特殊钢有限公司 | Manufacturing method of low-carbon nitrogen-containing austenitic stainless steel bar |
| CN115747662A (en) * | 2022-11-30 | 2023-03-07 | 山西太钢不锈钢股份有限公司 | Method for refining stainless steel for high-pressure common rail of engine |
| CN116103574A (en) * | 2021-11-10 | 2023-05-12 | 宝山钢铁股份有限公司 | Steel plate for magnetic shielding and manufacturing method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016115821A1 (en) * | 2015-01-23 | 2016-07-28 | 李泽文 | Nickel-based alloy pressure-resistant shell and implementation method thereof |
| CN105088094A (en) * | 2015-08-11 | 2015-11-25 | 宝钢特钢有限公司 | Manufacturing method of nitrogen-controlled austenitic stainless steel large forging piece |
| CN106191981A (en) * | 2016-08-26 | 2016-12-07 | 中航动力股份有限公司 | A kind of caustic solution of high-temperature alloy blades surface depleted layer |
| CN110964990A (en) * | 2019-11-11 | 2020-04-07 | 南京工程学院 | High-performance large-diameter thick-wall austenitic stainless steel forged pipe for nuclear power and short-process preparation method thereof |
| CN110964990B (en) * | 2019-11-11 | 2021-06-01 | 南京工程学院 | High-performance large-diameter thick-wall austenitic stainless steel forged pipe for nuclear power and short-process preparation method thereof |
| CN110935827A (en) * | 2019-12-02 | 2020-03-31 | 抚顺特殊钢股份有限公司 | Forging method of large-specification fine-grain austenitic gas valve steel SNCrW |
| CN110935827B (en) * | 2019-12-02 | 2021-06-08 | 抚顺特殊钢股份有限公司 | Forging method of large-specification fine-grain austenitic stainless steel SNCrW bar |
| CN116103574A (en) * | 2021-11-10 | 2023-05-12 | 宝山钢铁股份有限公司 | Steel plate for magnetic shielding and manufacturing method thereof |
| CN116103574B (en) * | 2021-11-10 | 2024-05-14 | 宝山钢铁股份有限公司 | Steel plate for magnetic shielding and manufacturing method thereof |
| CN114250402A (en) * | 2021-12-16 | 2022-03-29 | 大冶特殊钢有限公司 | Manufacturing method of low-carbon nitrogen-containing austenitic stainless steel bar |
| EP4245880A4 (en) * | 2021-12-16 | 2024-04-03 | Daye Special Steel Co., Ltd. | Manufacturing method for low-carbon nitrogen-containing austenitic stainless steel bar |
| CN115747662A (en) * | 2022-11-30 | 2023-03-07 | 山西太钢不锈钢股份有限公司 | Method for refining stainless steel for high-pressure common rail of engine |
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