CN106636665B - A kind of preparation method of nuclear power motor axis - Google Patents
A kind of preparation method of nuclear power motor axis Download PDFInfo
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- CN106636665B CN106636665B CN201611243585.5A CN201611243585A CN106636665B CN 106636665 B CN106636665 B CN 106636665B CN 201611243585 A CN201611243585 A CN 201611243585A CN 106636665 B CN106636665 B CN 106636665B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
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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
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
-
- 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
- C21D2211/008—Martensite
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- Manufacturing & Machinery (AREA)
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Abstract
The invention belongs to metallurgical technology field more particularly to a kind of preparation methods of nuclear power motor axis.The nuclear power motor axis preparation method of the present invention, prepares raw material steel ingot, integrated artistic flow is specially using electroslag remelting process：Material composition optimizes, and produces electric grade, electroslag remelting, forging molding, forging post-processing, performance processing, product processing；It solves the problems, such as that the prior art can not produce CAP1400 project core main pump shield electric machine motor shafts, realizes its application on core main pump shield electric machine, and be extended to other nuclear power projects.
Description
Technical field
The invention belongs to metallurgical technology field more particularly to a kind of preparation methods of nuclear power motor axis.
Background technology
CAP1400 refers to the advanced passive nuclear power technology that installed capacity is 1,400,000 kilowatts, is in China《It is long in country
Phase scientific and technological development planning outline》In, the Generation Ⅲ with independent intellectual property right that clearly proposes.
CAP1400 projects are intended in the AP1000 technical foundation of current safety and better economy, by digestion, are absorbed and are created again
Newly, the large-scale advanced pressurized water reactor nuclear power with China's independent intellectual property right, more powerful, safety higher, longer life expectancy is formed
Technology is the advanced passive nuclear power technology that unique installed capacity in the world is 1,400,000 kilowatts.Motor shaft is CAP1400
Main shaft in mesh center main pump in shield electric machine, through entire shield electric machine, role can not be substituted.
Currently, at home and abroad there are no producers can produce CAP1400 project core main pump shield electric machine electric motor shaft forgeable pieces
Product mainly because its product size is big, requires material structure uniform, stringent to magnetic property and impact property requirement, therefore is studied
A kind of preparation method of nuclear power motor axis, it is quite necessary to.
Invention content
In view of the above-mentioned problems, the present invention provides a kind of preparation method of nuclear power motor axis, it is therefore intended that solve existing skill
Art can not produce the problem of CAP1400 project core main pump shield electric machine motor shafts, realize it on core main pump shield electric machine
Using, and it is extended to other nuclear power projects.
To achieve the goals above, the preparation method of nuclear power motor axis of the present invention, specifically includes following steps.
Step（1）By weight percentage, by ASTM A336M Grade F6 materials electroslags with base material electrode at sub-control
System exists：Ni 0.25-0.40%, Cr 12.00-13.00%, Mo 0.30-0.45%, Mn 0.30-0.50%, Si 0.20-0.40%,
C 0.08-0.11%, Co≤0.05%, Al≤0.05%, P≤0.015%, surplus Fe, H≤1.0ppm, O≤50ppm, N≤
150ppm；Electrode electroslag is at the electroslag ingot that size is Φ 900- Φ 950mm, and melting current control is 15000- in Electroslag Process
18000A, the control of remelting voltage are 75-90V；Slag charge in Electroslag Process selects pre-melted slag, and slag charge constituent element and content are：CaF2：
30-35%；Al2O3：40-45%；CaO：20-25%；MgO：5-8%, wherein H2O≤0.06%, C≤0.05%, S≤0.015%, P≤
0.015%。
Step（2）, when the electroslag ingot melting completion and ingredient meets step（1）After it is required that, it can be forged；Forging
It is 1150 ± 15 DEG C to make initial forging temperature, and final forging temperature is 850 ± 15 DEG C；Forging high-temperature area（1000-1150℃）Carry out large deformation
Quantitative change shape, each drafts are 50-60mm；Forge low-temperature space（850-1000℃）Relatively small deflection deformation is carried out, is pressed every time
Lower amount is 20-30mm；Billet size reaches Φ 480 ± 7mm specifications after forging.
Step（3）, the step（2）Positive temper is carried out to forging stock after the completion；970 ± 15 DEG C of normalized treatment temperature is right
Blank keeps the temperature 15-15.5h, then air-cooled；Machine temper, temper temperature 730 are carried out to blank after the completion of normalized treatment
± 10 DEG C keep the temperature 20-20.5h to blank, then air-cooled；Heating rate control is no more than 60 DEG C/h during positive temper.
Step（4）, the step（3）After the completion, to electric motor shaft forgeable piece quench the property heat treatment of tempering, hardening heat
970 ± 15 DEG C keep the temperature 12-12.5h to blank, and subsequent liquid is cooled to room temperature；732 ± 10 DEG C of temper temperature protects blank
Warm 20-20.5h, it is then air-cooled to arrive room temperature；Heating rate control is no more than 35 DEG C/h during temper of quenching.
Step（5）, the step（4）After the completion, processing is machined out to electric motor shaft forgeable piece, and examination is cut to its both ends
Material carries out postwelding to sample later and simulates hidden lino removal, and heat treatment process is：Sample is heated to 732 DEG C ± 14 DEG C simultaneously
After heat preservation 30 ± 1 hours；After speed to be not more than 55 DEG C per hour is cooled to 315 DEG C or less, it is air-cooled to room temperature.
Beneficial effects of the present invention.
The nuclear power motor axis preparation method of the present invention, raw material steel ingot, integrated artistic are prepared using electroslag remelting process
Flow is specially：Material composition optimizes, the electric grade of production, electroslag remelting, forging molding, section post-processing, performance processing, and product adds
Work；Wherein material composition optimization is very crucial, and the performance requirement of material not only needs have higher impact flexibility index, also wants
It asks with very high magnetic property index, the index request of the two is contradictory for material itself, because containing more
Ferritic structure and tempered martensite's material of stabilization can just obtain good magnetic property index, and more ferrite group
The toughness properties index of material can be substantially reduced by knitting, so the content to essential elements such as Cr, Si, Ni, C, Mo in material optimizes
Design can effectively statenchyma, and magnetic property index that one had not only improved material can be found but also to its impact flexibility index shadow
Little content is rung into branch, achievees the purpose that improve material comprehensive performance；In addition, electroslag remelting can not only improve the group of material
Uniformity is knitted, the degree of purity of material can be more effectively improved, improves product quality, material product is reduced and generates the general of defective work
Rate, the process for forging of optimization can effectively be crushed the crystal grain and dentrite structure of material, and uniform formation improves performance；Optimization
Heat-treatment technology method, materials microstructure uniformity can be effectively improved, improve the performance of material.
The martensitic stain less steel that motor shaft of the present invention uses（ASTM A336M Grade F6）It is a seed nucleus main pump material
Material, the outstanding feature of the alloy is to have excellent magnetic characteristics；H, the pernicious gases element such as O, N requires low.With relatively high incipient melting temperature
Degree, good intensity and toughness index and preferable thermal fatigue resistance energy.And it is strictly controlled in material composition optimization process
It makes its composition proportion, especially improves the content of C, Cr, addition Ni elements can effectively improve material during quenching treatment
Quenching degree；High Mo content is carried, the stability of material in drawing process can be effectively increased, while improving the strength of materials；Improve Si, Cr
The content of equal elements, can effectively improve the magnetic property of material；Mn elements improve, and can effectively increase austenite phase field, make its through hardening
Property enhancing, help to make during property heat treatment axis product to obtain uniform tissue；And considered critical Co≤0.05%,
Al≤0.05%, P≤0.015%, it is the mistake because element can be such that atomic radius increases after neutron irradiation thus to limit Co elements
More Co elements can make it, and there are security risks；The restriction of Al elements is because axis is chronically at the working condition of rotation, Al members
Cellulose content height be easy to cause the generation of field trash, and excessive field trash can make the axis product generation by alternate load effect for a long time
Micro-crack influences its safe application performance；P element is easy that material is made to generate Transition of Brittleness, and limiting its content contributes to axis product
The toughness properties for improving itself improve its safety in utilization；Advanced optimizing for various elements component content, is effectively improved
The comprehensive performance of material simultaneously makes it fully achieve making for CAP1400 project core main pump shield electric machine electric motor shaft forgeable piece materials
With requiring.In selected slag system constituent element in Electroslag Process the melting rate of material not only can be improved and can be effective in the present invention
Field trash in material removal improves the degree of purity of material, reduces the probability that product generates defective work.And slag charge is selected pre-
Slag can make motor shaft overall performance uniform, will not when in use occur because of ingredient or the microstructure segregation of local material
The phenomenon that brittle failure, and then there is safety accident；The high-temperature region aximal deformation value process for forging of use can effectively Broken Crystal,
Improve ferritic structure form, it is made to be distributed in small and dispersed type, not only can effectively improve the magnetic property of material and to reducing
The impact flexibility energy Index Influence of material is smaller；Take positive tempering process processing that can be effectively improved the uniform of forging tissue after forging
Property, the uniform of forging shaft upper, middle and lower end heating can effectively ensure that using well formula Resistant heating stove in property heat treatment quenching process
Degree improves the whole uniformity of forging shaft performance, ensures the performance during its use.
The motor shaft that motor shaft preparation method provided by the invention obtains disclosure satisfy that CAP1400 project core main pumps shielding electricity
The demand of machine motor shaft forging products, the motor shaft product produced is no matter in terms of appearance and size or product comprehensive performance
Aspect can reach its technical property requirements, be the product that domestic and international the first disclosure satisfy that engineering demand.
Specific implementation mode
With reference to specific embodiment, the present invention is described further.
Embodiment 1.
Electroslag is existed with the Composition Control of base material electrode：Ni 0.28%, Cr 12.56%, Mo 0.34%, Mn 0.45%, Si
0.37%, C 0.106%, Co 0.02%, Al 0.015%, P 0.010%, Fe surplus, H≤1.0 ppm, O≤50ppm, N≤
150ppm.Electrode electroslag is at the electroslag ingot that size is Φ 930mm, and melting current control is 17000A, remelting in Electroslag Process
Voltage control is 85V；Slag charge in Electroslag Process selects pre-melted slag, and slag constituent element and content are：CaF2：32%；Al2O3：42%；
CaO：20%；MgO：6%, wherein H2O≤0.06%, C≤0.05%, S≤0.015%, P≤0.015%.
Electroslag ingot shove charge is warming up to 1150 DEG C, after soaking time is met the requirements, and comes out of the stove and is forged, and final molding.
After the completion of blank forging, heat treatment after forging is carried out to blank, 980 DEG C of normalized treatment temperature keeps the temperature 15h to blank, with
It is air-cooled afterwards；Temper is carried out to blank after the completion of normalized treatment, 735 DEG C of temper temperature keeps the temperature 20h to blank, then empty
It is cold；Heating rate control is no more than 60 DEG C/h during positive temper.
Then to the electric motor shaft forgeable piece after roughing quench the property heat treatment of tempering, and 975 DEG C of hardening heat is to blank
12.5h is kept the temperature, subsequent liquid is cooled to room temperature；732 DEG C of temper temperature keeps the temperature 20h to blank, then air-cooled to arrive room temperature；It quenches
Heating rate control is no more than 35 DEG C/h during temper.
Comprehensive performance requirement of the CAP1400 projects core main pump shield electric machine needed for motor shaft forging products, is shown in Table 1 and table
2；After the completion of 1 property heat treatment of embodiment, processing is machined out to motor shaft, and sample is cut to its both ends, later to examination
Material carries out postwelding and simulates hidden lino removal, carries out final performance detection after the completion of processing, heat treatment process is：Sample heats
To 732 DEG C ± 14 DEG C and keep the temperature 30 ± 1 hours；It is air-cooled to room temperature after being cooled to 315 DEG C or less with speed per hour≤55 DEG C,
Surveyed results of property is shown in Table 3- tables 4.
Mechanical property requirements needed for 1 product of table.
Magnetic property requirements needed for 2 product of table.
The motor shaft product mechanical property value that 3 embodiment 1 of table is prepared.
The motor shaft product magnetic property value that 4 embodiment 1 of table is prepared.
Embodiment 2.
Electroslag is existed with the Composition Control of base material electrode：Ni 0.27%, Cr 12.62%, Mo 0.37%, Mn 0.48%, Si
0.35%, C 0.101%, Co 0.02%, Al 0.017%, P 0.008%, Fe surplus, H≤1.0 ppm, O≤50ppm, N≤
150ppm.Electrode electroslag is at the electroslag ingot that size is Φ 930mm, and melting current control is 17200A, remelting in Electroslag Process
Voltage control is 86V；Slag charge in Electroslag Process selects pre-melted slag, and slag constituent element and content are：CaF2：32%；Al2O3：42%；
CaO：20%；MgO：6%, wherein H2O≤0.06%, C≤0.05%, S≤0.015%, P≤0.015%；Surveyed results of property, is shown in Table
5- tables 6.
The motor shaft product mechanical property value that 5 embodiment 2 of table is prepared.
The motor shaft product magnetic property value that 6 embodiment 2 of table is prepared.
Embodiment 3.
Electroslag is existed with the Composition Control of base material electrode：Ni 0.30%, Cr 12.45%, Mo 0.32%, Mn 0.47%, Si
0.40%, C 0.098%, Co 0.02%, Al 0.012%, P 0.012%, Fe surplus, H≤1.0 ppm, O≤50ppm, N≤
150ppm.Electrode electroslag is at the electroslag ingot that size is Φ 930mm, and melting current control is 16800A, remelting in Electroslag Process
Voltage control is 87V；Slag charge in Electroslag Process selects pre-melted slag, and slag constituent element and content are：CaF2：32%；Al2O3：42%；
CaO：20%；MgO：6%, wherein H2O≤0.06%, C≤0.05%, S≤0.015%, P≤0.015%；Surveyed results of property, is shown in Table
7- tables 8.
The motor shaft product mechanical property value that 7 embodiment 3 of table is prepared.
The motor shaft product magnetic property value that 8 embodiment 3 of table is prepared.
By the testing result of above-mentioned 3 embodiments it is found that a kind of preparation side of nuclear power motor axis provided by the present invention
The motor shaft product properties that method is produced are satisfied by product and nuclear power engineering requirement.
Claims (5)
1. a kind of preparation method of nuclear power motor axis, which is characterized in that specifically include following steps：
Step（1）, by weight percentage, by the Composition Control of ASTM A336M Grade F6 materials electroslag base material electrodes
：Ni 0.25-0.40%, Cr 12.00-13.00%, Mo 0.30-0.45%, Mn 0.30-0.50%, Si 0.20-0.40%, C
0.08-0.11%, Co≤0.05%, Al≤0.05%, P≤0.015%, surplus Fe, H≤1.0ppm, O≤50ppm, N≤
150ppm；Electrode electroslag is at the electroslag ingot that size is Φ 900- Φ 950mm, and melting current control is 15000- in Electroslag Process
18000A, the control of remelting voltage are 75-90V；Slag charge in Electroslag Process selects pre-melted slag, and slag charge constituent element and content are：CaF2：
30-35%；Al2O3：40-45%；CaO：20-25%；MgO：5-8%, wherein H2O≤0.06%, C≤0.05%, S≤0.015%, P≤
0.015%；
Step（2）, when the electroslag ingot melting completion and ingredient meets step（1）After it is required that, it can be forged；Forging is begun
It is 1150 ± 15 DEG C to forge temperature, and final forging temperature is 850 ± 15 DEG C；Forging high-temperature area, i.e., 1000-1150 DEG C carry out aximal deformation value
Deformation, each drafts are 50-60mm；Low-temperature space is forged, i.e., 850-1000 DEG C, carries out relatively small deflection deformation, is pressed every time
Lower amount is 20-30mm；Billet size reaches Φ 480 ± 7mm specifications after forging；
Step（3）, the step（2）Positive temper is carried out to forging stock after the completion；970 ± 15 DEG C of normalized treatment temperature is to blank
15-15.5h are kept the temperature, it is then air-cooled；Temper, 730 ± 10 DEG C of temper temperature are carried out to blank after the completion of normalized treatment
20-20.5h is kept the temperature to blank, it is then air-cooled；Heating rate control is no more than 60 DEG C/h during positive temper；
Step（4）, the step（3）After the completion, to electric motor shaft forgeable piece quench the property heat treatment of tempering, hardening heat 970
± 15 DEG C keep the temperature 12-12.5h to blank, and subsequent liquid is cooled to room temperature；732 ± 10 DEG C of temper temperature keeps the temperature blank
20-20.5h then air-cooled arrive room temperature；Heating rate control is no more than 35 DEG C/h during temper of quenching；
Step（5）, the step（4）After the completion, processing is machined out to electric motor shaft forgeable piece, and sample is cut to its both ends,
Postwelding is carried out to sample later and simulates hidden lino removal, heat treatment process is：Sample is heated to 732 DEG C ± 14 DEG C and keeps the temperature
After 30 ± 1 hours；After speed to be not more than 55 DEG C per hour is cooled to 315 DEG C or less, it is air-cooled to room temperature.
2. the preparation method of nuclear power motor axis as described in claim 1, which is characterized in that the step（1）Middle electroslag
Existed with the Composition Control of base material electrode：Ni 0.28%, Cr 12.56%, Mo 0.34%, Mn 0.45%, Si 0.37%, C
0.106%, Co 0.02%, Al 0.015%, P 0.010%, Fe surplus, H≤1.0 ppm, O≤50ppm, N≤150ppm；
Electrode electroslag is at the electroslag ingot that size is Φ 930mm, and melting current control is 17000A, remelting voltage in Electroslag Process
Control is 85V；Slag charge in Electroslag Process selects pre-melted slag, and slag constituent element and content are：CaF2：32%；Al2O3：42%；CaO：
20%；MgO：6%, wherein H2O≤0.06%, C≤0.05%, S≤0.015%, P≤0.015%.
3. the preparation method of nuclear power motor axis as described in claim 1, which is characterized in that the step（1）Middle electroslag
Existed with the Composition Control of base material electrode：Ni 0.27%, Cr 12.62%, Mo 0.37%, Mn 0.48%, Si 0.35%, C
0.101%, Co 0.02%, Al 0.017%, P 0.008%, Fe surplus, H≤1.0, O≤50ppm, N≤150ppm；
Electrode electroslag is at the electroslag ingot that size is Φ 930mm, and melting current control is 17200A, remelting voltage in Electroslag Process
Control is 86V；Slag charge in Electroslag Process selects pre-melted slag, and slag constituent element and content are：CaF2：32%；Al2O3：42%；CaO：
20%；MgO：6%, wherein H2O≤0.06%, C≤0.05%, S≤0.015%, P≤0.015%.
4. the preparation method of nuclear power motor axis as described in claim 1, which is characterized in that the step（1）Middle electroslag
Existed with the Composition Control of base material electrode：Ni 0.30%, Cr 12.45%, Mo 0.32%, Mn 0.47%, Si 0.40%, C
0.098%, Co 0.02%, Al 0.012%, P 0.012%, Fe surplus, H≤1.0, O≤50ppm, N≤150ppm；
Electrode electroslag is at the electroslag ingot that size is Φ 930mm, and melting current control is 16800A, remelting voltage in Electroslag Process
Control is 87V；Slag charge in Electroslag Process selects pre-melted slag, and slag constituent element and content are：CaF2：32%；Al2O3：42%；CaO：
20%；MgO：6%, wherein H2O≤0.06%, C≤0.05%, S≤0.015%, P≤0.015%.
5. the elder generation that nuclear power motor axis prepared by preparation method as described in claim 1 is 1,400,000 kilowatts for installed capacity
Into passive core main pump shield electric machine motor shaft.
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| CN102764954A (en) * | 2012-06-26 | 2012-11-07 | 江苏金源锻造股份有限公司 | Forging process for wind generator spindle |
| CN103451541A (en) * | 2013-08-29 | 2013-12-18 | 钢铁研究总院 | Martensite stainless steel applicable to rotor of shield pump of nuclear power station |
| CN105648161A (en) * | 2016-04-08 | 2016-06-08 | 中国第重型机械股份公司 | Preheat treatment method for large-size forged steel supporting roller |
| CN106244780A (en) * | 2016-08-29 | 2016-12-21 | 沈阳科金特种材料有限公司 | A kind of control method of nuclear power forging material hydrogen content |
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