CN106893947B - A kind of preparation method for the bearing steel being resistant to 400 degree of high temperature - Google Patents
A kind of preparation method for the bearing steel being resistant to 400 degree of high temperature Download PDFInfo
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- CN106893947B CN106893947B CN201710194788.8A CN201710194788A CN106893947B CN 106893947 B CN106893947 B CN 106893947B CN 201710194788 A CN201710194788 A CN 201710194788A CN 106893947 B CN106893947 B CN 106893947B
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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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/46—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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
The invention belongs to the development fields of high-temperature bearing steel, relate generally to a kind of preparation method for the bearing steel being resistant to 400 degree of high temperature.The bearing of bearing steel processing, can be on active service use at a high temperature of no more than 400 DEG C.High-temperature bearing steel of the present invention is 4.50~5.28%Cr, 3.75~4.10%Mo, 0.56~0.80%V, 0.30~0.34%Mn, 0.21~0.26%Ni, 0.20~0.29%Si by vaccum sensitive stove and the double vacuum metlings of vacuum electroslag remelting, ingredient.Heat treatment process is：Bearing steel is heated to 800~870 DEG C of heat preservations, cools to 700~800 DEG C of isothermal annealings, then slow cooling is to room temperature；It is heated to 1050~1070 DEG C of solid solutions, oil quenching after heat preservation；510~550 DEG C of tempering are heated to, the time is 2~2.5h, three times by the tempering of this technique.The new type high temperature bearing steel that the present invention designs is by reducing content of vanadium so that carbide small and dispersed is distributed, and can reduce the generation in fatigue crack source, hardness is further enhanced simultaneously, room temperature hardness is not less than 62HRC, and 400 DEG C of high temperature hardness are not less than 658HV, meet the application under hot conditions.
Description
Technical field
The invention belongs to the exploitation of the ingredient of high-temperature bearing steel and technical field of heat treatment technology, relate generally to a kind of novel height
The ingredient of warm bearing steel is developed and heat treatment process.
Background technology
High-temperature bearing steel is mainly used in the main shaft bearing in aero-engine, is used in aircraft or rocket.Bearing is hard
Angle value is higher, advantageous to the fatigue life of bearing, and active time is longer.With the development of current gas turbine, need in high temperature
Down there is higher hardness could meet working long hours for gas turbine.Thus, improve the room temperature hardness and high temperature of bearing steel
Hardness is necessary.The steel grade trade mark and its world of present widely applied high-temperature bearing steel, the U.S. and domestic standard are shown in
Table 1.Wherein M50 (being equivalent to domestic 8Cr4Mo4V) is current most popular high-temperature bearing steel both at home and abroad, is mainly used for
Gas turbine main shaft bearing belongs to full hardening type bearing steel, compares carburizing type simple production process, of low cost, temperature in use
At 315 DEG C or less.According to U.S.'s high-speed steel standard, chemical composition feature is：0.78~0.88wt.%C, 3.75~
4.50wt.%Cr, 3.90~4.75wt.%Mo, 0.80~1.25wt.%V, 0.10~0.15wt.%Ni, 0.15~
0.45wt.%Mn, 0.20~0.60wt.%Si, P≤0.03wt.%, S≤0.03wt.%.M50 Heat-Treatment of Steel techniques are general
For：Steel is preheated at 732~843 DEG C, after be heated to 1104 DEG C in salt bath furnace, keep the temperature minimum 5 minutes, rear oil quenching to 100
~200 DEG C, it is fuel-displaced it is air-cooled arrive room temperature, be heated to 538 DEG C, tempering three times, 2 hours every time.Finally obtain ledeburite steel.
Provide that the room temperature hardness of M50 bearing steels must not be less than 61HRC in A600.13324 high-speed steel Unite States Standards, in the use of bearing steel
In standard, it is specified that bearing steel at service temperatures, hardness cannot be below 58HRC or 652HV, and the hardness of bearing steel is higher, resistance to
Mill property is better.It is deposited with mentioned component content and by above-mentioned heat treatment method treated bearing steel working surface or subsurface
In the irregular carbide of bulky grain, the mainly primary carbide containing V, Mo, fatigue flake is easily become during being on active service
Starting point.For M50 steel after Overheating Treatment, room temperature hardness is 61~63HRC of Rockwell hardness number.
High-temperature bearing steel chemical composition in 1 world of table, the U.S. and Chinese Industrial Standards (CIS)
There is following related invention to the improvement of the high temperature bearing steel such as M50.Patent CN104313294A is to have invented raising
The heat treatment method of Cr4Mo4V steel dimensions stability, composition of steel is identical as M50 steel, heat treatment for be heated to 1065~
1090 DEG C, 30~55min is kept the temperature, inflated with nitrogen oil cooling is to 50~200 DEG C after coming out of the stove；At 535~545 DEG C, 2~2.5 hours are kept the temperature,
Tempering is three times.It is characterized in that：It adds and is tempered at 520 ± 5 DEG C after corase grinding, 4~4.5 hours；After fine grinding at 250 ± 5 DEG C
Additional tempering, 8~10 hours time.Its dimensional stability is improved after processing, and average-size becomes after the storage of finished product lasso
Rate is 1.33 × 10-5, size maximum rate of change is 2.67 × 10-5.Patent CN104294031A passes through high pressure gas quenching technique side
Method improves its deformation and the larger problem of taper.Its technique be by high-temperature bearing steel ring preheating insulation under vacuum conditions,
Preheating temperature and time are respectively twice：650 DEG C, 30min；850 DEG C, 30min, after be warming up to 1070 DEG C, heat preservation 50 ±
10min；High pressure nitrogen air quenching is used again, thereafter 2~2.5h of tempering at 540 DEG C, totally 3 times.Hardness is 61.5 after its high tempering
~62HRC.
In addition, having the much Surface hardening treatment research to high-temperature bearing steel both at home and abroad, wherein being most widely such as patent
In US6966954B2, carburizing and Nitrizing Treatment are passed through to M50 steel and improved M50NiL steel.Wherein M50NiL composition of steel is
C content is reduced on the basis of M50 and improves Ni contents simultaneously, with the Surface heat-treatent condition of reach a high temperature carburizing or nitriding.Its
The chemical composition of M50NiL be 0.11~0.15wt.%C, 4.00~4.25wt.%Cr, 4.00~4.50wt.%Mo, 1.13~
1.33wt.%V, 3.20~3.60wt.%Ni, 0.15~0.35wt.%Mn, 0.10~0.25wt.%Si, P≤
0.015wt.%, S≤0.010wt.%, Co≤0.25%, W≤0.25wt.%, Cu≤0.1wt.%, remaining is Fe.In high temperature
Under, carbo-nitriding processing is carried out to its surface, the thickness of infiltration layer is 0.002-0.014 inches so that case hardness obtains pole
It is big to improve, up to 72HRC.
The high-temperature bearing to fail after military service is detected and is found, bulk, shape are found not on bearing working surface or subsurface
Primary carbide regular, unevenly distributed causes the generation and expansion of fatigue crack, has seriously affected the military service of bearing steel
Service life.And the shape of carbide and distribution are determined by the ingredient of steel with heat treatment process, therefore the present invention develops one newly
The high-temperature bearing steel of component system and its corresponding heat treatment process can substantially reduce the precipitation of bulk primary carbide, but
Very high room temperature and high temperature hardness are kept simultaneously, so as to improve the high-temperature service service life of bearing.
Invention content
In order to solve the above technical problems, the purpose of the present invention is disclose a kind of high-temperature bearing steel of new component and corresponding system
Technique is made, the carbide particle being evenly distributed to reduce the size of carbide and higher hardness number improve bearing steel
Service life.
The technical solution adopted by the present invention is：A kind of novel design of high-temperature bearing composition of steel and heat treatment method, aobvious
It writes to reduce and be formed under the V element content of primary carbide, optimize other alloying component contents and corresponding heat treatment process, come
The room temperature and high temperature hardness for ensureing bearing steel, have refined carbide size, and small and dispersed is distributed to improve service life.Novel
In terms of the composition design of high-temperature bearing steel, the high-temperature bearing steel is Mo systems bearing steel from ingredient, and preparation process is：
(1) smelting of steel：Suitable for vaccum sensitive stove and the double vacuum metlings of vacuum electroslag remelting.Ingredient is different from making at present
High-temperature bearing steel, mass fraction ranging from 0.75~0.90wt.% of carbon, the mass fraction content range of nitrogen are
0.005~0.012wt.%, including alloying element have Cr, Mo, V, Mn, Ni, Si, mass fraction content is ranging from
4.50~5.28wt.%Cr, 3.75~4.10wt.%Mo, 0.56~0.80wt.%V, 0.30~0.34wt.%Mn, 0.21~
0.26wt.%Ni, 0.20~0.29wt.%Si, the control of other elements mass fraction content in Ti≤0.005wt.%, P≤
0.01wt.%, S≤0.008wt.%, O≤0.0009wt.%, remaining is Fe and inevitable impurity.
(2) solidification, hot forging/hot rolling technology：Above-mentioned smelting is obtained into molten steel, steel billet or steel ingot is obtained by continuous casting or molding,
10min~20min is preheated after solidification at 750~850 DEG C, is heated to 1050 DEG C~1150 DEG C, hot forging or hot rolling are that diameter is not small
In the bar of 15mm, finish-forging or finishing temperature are not less than 900 DEG C, and furnace cooling or ash cooling are to room temperature after forging.
(3) heat treatment process：
Above-mentioned forging material or stocking are passed through to three isothermal annealing, high temperature solid solution and oil quenching, high tempering heat treatments successively
Process obtains required performance.Bearing steel is heated to 800~870 DEG C when first step isothermal annealing, keeps the temperature 4~6h, then again
Be as cold as 700~800 DEG C, 4~6h of isothermal with 3~10 DEG C/min cooling rates, after with the cooling rate slow cooling of 20~30 DEG C/h to 600~670
DEG C, then with being furnace-cooled to room temperature；Second step be by the steel part for being cooled to room temperature be heated to 750~850 DEG C preheating 30~50min, then with
10~20 DEG C/min speed is heated to 1050~1060 DEG C, keeps the temperature 30~50min；Oil cooling is to 100~200 DEG C after coming out of the stove, then
It is air-cooled to room temperature；Third step be to be tempered bearing steel after cooling 2~2.5 hours between 520~550 DEG C, after be air-cooled to room
Temperature is tempered three times altogether.Its hardness reaches 62-65HRC after processing, and the Vickers hardness at 400 DEG C of high temperature reach 658HV with
On, it is equivalent to Rockwell hardness 58HRC or more, can meet well and work in 400 DEG C of environment.
Also the steel part that such as above-mentioned first step isothermal annealing can be obtained, second step are changed to be heated to 750~850 DEG C of preheatings 30
~50min, then 1070 DEG C are heated to 10~20 DEG C/min speed, keep the temperature 30~50min；Oil cooling is to 100~200 after coming out of the stove
DEG C, it is fuel-displaced to be air-cooled to room temperature；Third step is to be tempered bearing steel after cooling 2~2.5 hours between 510~550 DEG C, rear empty
It is cooled to room temperature, is tempered altogether three times.Its hardness reaches 63-66HRC after processing, and the Vickers hardness at 400 DEG C of high temperature reaches
660HV or more can meet and work in 400 DEG C of environment well.
The method of the present invention can be used for the manufacture of aircraft engine main shaft bearing steel, improves bearing at room temperature and works
At a temperature of hardness number, and make carbide small and dispersed distribution to reduce the generation of crackle, the active time of bearing can be extended.
Description of the drawings
Fig. 1 is the SEM organization charts after Overheating Treatment, and (a) is the solution treatment at 1060 DEG C of A steel, and 540 DEG C of tempering are three times
Tissue picture afterwards, (b) B steel solution treatment at 1050 DEG C, the tissue picture after 540 DEG C of tempering three times.
Fig. 2 is metallograph under light microscopic after heat treatment, after being dissolved at 1070 DEG C of (a) A steel, 540 DEG C of tempered structure figures three times
Piece, after (b) being dissolved at 1050 DEG C of B steel, 540 DEG C of tempered structure pictures three times.
Specific implementation mode
Embodiment：
The specific implementation mode of the present invention is given below and is illustrated in conjunction with subordinate list.
Ingredient is as shown in Table 1 and Table 2, and by vaccum sensitive stove and the double vacuum metlings of vacuum electroslag remelting, rear forging is a diameter of
The bar of 25mm is cut into the fritter that thickness is 15mm, grouping experiment.Bearing steel is kept the temperature by 850 DEG C, 750 DEG C of isothermal annealings,
650 DEG C are cooled to the speed of 20 DEG C~30 DEG C/min, rear slow cooling to room temperature, according to experimental program shown in table 3, in each solid solution temperature
Degree heating 30min, oil cooling of coming out of the stove between 100~200 DEG C, then it is fuel-displaced be air-cooled to room temperature, to prevent from cracking, in time at 300 DEG C
It is tempered below.The bearing steel for being cooled to room temperature is put into tempering furnace, high tempering, tempering time are carried out according to 3 temperature displaying functions of table
It for 2~2.5h, is tempered 3 times altogether, tempering every time is all made of air-cooled after coming out of the stove, until room temperature carries out in next step again.To final sample
Its Rockwell hardness is measured, and high temperature hardness measurement is carried out to the comparatively ideal sample of hardness number, measuring temperature is 400 DEG C, each right
The hardness number that the heat treatment process and measurement answered obtain such as table 3, table 4.Wherein, A1, A2, A5~A24, B4~B21 steel are normal
Warm hardness number has been more than 60HRC, has reached the requirement of high-temperature bearing steel, A6~A9, A12, A13, A18~A22, B6,
The hardness number of B7, B11, B12, B18, B19 sample has been more than 63HRC, has been more than the highest hardness under M50 bearing steel room temperature
Value.For the hardness measurement at 400 DEG C, it is seen that A6~A9, A12~A15, A18~A22, B5~B7, B10~B14, B17
The high temperature hardness of~B20 samples has been more than 658HV i.e. 58HRC, and requirement is fully achieved.Fig. 1 is after Overheating Treatment
SEM organization charts, Fig. 2 be heat treatment after light microscopic under metallograph, as can be seen from the figure the carbide particle of the material is tiny,
Full-size is no more than 4 μm, and Dispersed precipitate is between tempered martensite lath.
The chemical composition (wt%) of 1 invention steel A of table
The chemical composition (wt%) of 2 invention steel B of table
Hardness number after table 3A steel different heat treatment techniques
Hardness number after table 4B steel different heat treatment techniques
Claims (2)
1. a kind of preparation method for the bearing steel being resistant to 400 degree of high temperature, it is characterised in that preparation process is：
(1) smelting of steel：Suitable for vaccum sensitive stove and the double vacuum metlings of vacuum electroslag remelting；Composition quality fraction range is：C
0.75~0.90wt.%, N 0.005~0.012wt.%, Cr 4.50~5.28wt.%, Mo 3.75~4.10wt.%, V
0.56~0.80wt.%, Mn 0.30~0.34wt.%, Ni 0.21~0.26wt.%, Si 0.20~0.29wt.%, Ti≤
0.005wt.%, P≤0.01wt.%, S≤0.008wt.%, O≤0.0009wt.%, remaining for Fe and inevitably it is miscellaneous
Matter；
(2) solidification, hot forging/hot rolling technology：Above-mentioned smelting is obtained into molten steel, steel billet or steel ingot are obtained by continuous casting or molding, solidified
10min~20min is preheated at 750~850 DEG C afterwards, is heated to 1050 DEG C~1150 DEG C, hot forging or hot rolling are not less than for diameter
The bar of 15mm, finish-forging or finishing temperature are not less than 900 DEG C, and furnace cooling or ash cooling are to room temperature after forging；
(3) heat treatment process：Above-mentioned forging material or stocking are passed through into isothermal annealing, high temperature solid solution and oil quenching, high tempering successively
Three heat treatment procedures obtain required performance；Bearing steel is heated to 800~870 DEG C when first step isothermal annealing, heat preservation 4~
Then 6h is as cold as 700~800 DEG C, 4~6h of isothermal with 3~10 DEG C/min cooling rates again, after with the cooling rate slow cooling of 20~30 DEG C/h extremely
600~670 DEG C, then with being furnace-cooled to room temperature；Second step be by the steel part for being cooled to room temperature be heated to 750~850 DEG C preheating 30~
50min, then 1050~1060 DEG C are heated to 10~20 DEG C/min speed, keep the temperature 30~50min；After coming out of the stove oil cooling to 100~
200 DEG C, then it is air-cooled to room temperature；Third step is to be tempered bearing steel after cooling 2~2.5 hours between 520~550 DEG C,
After be air-cooled to room temperature, altogether tempering three times；Its hardness reaches 62-65HRC after processing, and the Vickers hardness at 400 DEG C of high temperature reaches
To 658HV or more, it is equivalent to Rockwell hardness 58HRC or more, can meet well and work in 400 DEG C of environment.
2. a kind of preparation method for the bearing steel being resistant to 400 degree of high temperature, it is characterised in that preparation process is：
(1) smelting of steel：Suitable for vaccum sensitive stove and the double vacuum metlings of vacuum electroslag remelting；Composition quality fraction range is：C
0.75~0.90wt.%, N 0.005~0.012wt.%, Cr 4.50~5.28wt.%, Mo 3.75~4.10wt.%, V
0.56~0.80wt.%, Mn 0.30~0.34wt.%, Ni 0.21~0.26wt.%, Si 0.20~0.29wt.%, Ti≤
0.005wt.%, P≤0.01wt.%, S≤0.008wt.%, O≤0.0009wt.%, remaining for Fe and inevitably it is miscellaneous
Matter；
(2) solidification, hot forging/hot rolling technology：Above-mentioned smelting is obtained into molten steel, steel billet or steel ingot are obtained by continuous casting or molding, solidified
10min~20min is preheated at 750~850 DEG C afterwards, is heated to 1050 DEG C~1150 DEG C, hot forging or hot rolling are not less than for diameter
The bar of 15mm, finish-forging or finishing temperature are not less than 900 DEG C, and furnace cooling or ash cooling are to room temperature after forging；
(3) heat treatment process：Above-mentioned forging material or stocking are passed through into isothermal annealing, high temperature solid solution and oil quenching, high tempering successively
Three heat treatment procedures obtain required performance；Bearing steel is heated to 800~870 DEG C when first step isothermal annealing, heat preservation 4~
Then 6h is as cold as 700~800 DEG C, 4~6h of isothermal with 3~10 DEG C/min cooling rates again, after with the cooling rate slow cooling of 20~30 DEG C/h extremely
600~670 DEG C, then with being furnace-cooled to room temperature；Second step be by the steel part for being cooled to room temperature be heated to 750~850 DEG C preheating 30~
50min, then 1070 DEG C are heated to 10~20 DEG C/min speed, keep the temperature 30~50min；Oil cooling is to 100~200 DEG C after coming out of the stove,
Then it is air-cooled to room temperature；Third step is to be tempered bearing steel after cooling 2~2.5 hours between 510~550 DEG C, rear air-cooled
To room temperature, it is tempered altogether three times；Room temperature hardness that treated can reach 63-66HRC, and the Vickers hardness at 400 DEG C of high temperature reaches
To 660HV or more, it can meet well and work in 400 DEG C of environment.
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| CN106435133B (en) * | 2016-10-26 | 2018-12-14 | 承德建龙特殊钢有限公司 | A method of reducing CrMo series rolled bar Brinell hardness |
| CN112719198A (en) * | 2019-10-14 | 2021-04-30 | 辽宁银捷装备科技股份有限公司 | Forging process method of 8Cr4Mo4V steel bearing ring |
| CN112322989A (en) * | 2020-11-23 | 2021-02-05 | 浙江宝武钢铁有限公司 | High-temperature-resistant wear-resistant bearing steel |
| CN113201698B (en) * | 2021-04-30 | 2022-05-13 | 钢铁研究总院 | High-temperature bearing steel and clean and uniform preparation method thereof |
| CN114231825B (en) * | 2021-12-22 | 2022-07-22 | 中国科学院金属研究所 | High-carbon high-alloy steel product and preparation method thereof |
| CN115323276B (en) * | 2022-10-11 | 2023-01-06 | 联峰钢铁（张家港）有限公司 | Bearing steel with high strength and high plasticity and production process thereof |
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| EP1420078A2 (en) * | 2002-11-12 | 2004-05-19 | Koyo Seiko Co., Ltd. | Brearing steel excellent in corrosion resistance |
| CN1863935A (en) * | 2003-10-10 | 2006-11-15 | Ntn株式会社 | Rolling bearing |
| CN101874125A (en) * | 2007-11-27 | 2010-10-27 | Ntn株式会社 | Machine component and rolling bearing |
| CN101798657A (en) * | 2010-04-01 | 2010-08-11 | 戚正风 | Micro-alloy chemical die steel and thermal treatment method thereof |
| CN104313294A (en) * | 2014-10-20 | 2015-01-28 | 洛阳Lyc轴承有限公司 | Thermal treatment method for dimensional stability of Cr4Mo4V steel bearing ring |
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