CN108004456A - A kind of production method of GCr15 Bearing Steel Billets - Google Patents
A kind of production method of GCr15 Bearing Steel Billets Download PDFInfo
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- CN108004456A CN108004456A CN201711312719.9A CN201711312719A CN108004456A CN 108004456 A CN108004456 A CN 108004456A CN 201711312719 A CN201711312719 A CN 201711312719A CN 108004456 A CN108004456 A CN 108004456A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C2007/0093—Duplex process; Two stage processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of production method of GCr15 Bearing Steel Billets, technological process is " molten iron pretreatment → 120t top and bottom combined blown converters → LF → VD → 150mm × 150mm billet casters → high line heating strand → high-pressure water descaling → rolling → control is cold ".Converter carries out desulfurization, terminal highcasting speed using double slag process technique；LF refining realizes the reduction refining and deep desulfurization, high alkalinity of molten steel；VD vacuum outgas removes the hydrogen and nitrogen in molten steel, breaks calm, removal of inclusions and further desulfurization after sky；Casting process uses low overheat weak cold technique, electromagnetic agitating technology and strand retarded cooling process, improves the quality of strand；Heating strand process ensures sufficient heating time and heating-up temperature, ensures that heating strand is uniform, carbide fully dissolves.The production method of the present invention controls the content of oxygen in steel, nitrogen and field trash well, and stocking has good comprehensive mechanical property, meets national standard.
Description
Technical field
The invention belongs to the technology field of smelting iron and steel, more particularly to a kind of life of GCr15 Bearing Steel Billets
Production method.
Background technology
The product demand of the high added values such as development and social progress with Domestic Automotive Industry, bearing steel is increasingly
Greatly, these products have very strict requirement to harmful element, inclusion content and species in steel, and bearing steel is mainly used to make
Make the part of rolling bearing, they subject high alternate load at work, therefore roller bearing steel should have high hardness,
Wearability and fatigue strength, wherein GCr15 are that a kind of alloy content is less, have superperformance, most widely used high carbon chromium
Bearing steel.Research shows that the fatigue life of bearing steel can be increased substantially by reducing [O] content in steel.Therefore at present will steel
In [O] content control ultra low levels as improvement performance important means.And bearing steel inclusion type, size and number
There is significant impact to the fatigue life of product.
The smelting procedure of production GCr15 bearing steels is mainly at present：Converter procedure, existing smelting GCr15 bearing steels turn
Furnace technology, terminal catch carbon >=0.09, finishing slag basicity ＞ 3.0；LF refining process, existing LF refining process finishing slag basicity 5-7；VD works
Sequence, soft blow time 5min, but do not use brokenly calmness after sky；Continuous casting working procedure, M-EMS Current 400A, frequency 2.5Hz,
And use high pulling rate cold technique by force.
The content of the invention
The technical problems to be solved by the invention are, in the case where improving carbon content of molten steel, to pass through the temperature of converter smelting molten steel
And control, finished product total oxygen demand is less than 10ppm, by optimizing the processes such as converter smelting, refining and continuous casting, propose a kind of GCr15
The production method of Bearing Steel Billet.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of life of GCr15 Bearing Steel Billets
Production method, includes the following steps：
(1) molten iron pre-processes：Select the molten iron that meets the requirements, carry out molten iron pretreatment desulfurizing, it is desirable to enter stove molten iron [S]≤
0.02%；
(2) top and bottom combined blown converter：Using double slag process, rifle position is rationally adjusted early period, stirred using the big bottom blowings of 450-500nm3/h
Mix, ensure that the fusing of clinker is all right, the middle and later periods uses 250-300nm3/h moderate strength bottom blowings, prevents slag getting dry, eventually
Point highcasting speed and pushing off the slag operation, carbon content control is in 0.1%-0.3%, red packet tapping, 1610-1640 DEG C of tapping temperature；
(3) LF refining：After molten steel enters the station, killing, makes white slag to electricity rapidly, adds CaO in two batches, is flowed depending on clinker
Property is adjusted with bauxite；
(4) VD vacuum outgas：Using 67Pa high vacuum time 15min, using soft blow pattern, after application of vacuum, take
Steel sample and slag specimen, weak mixing time 20-30min, forbids exposed molten steel face, and application of vacuum terminates, and residual aluminium content requires Als ＞
0.010%, it is 5 minutes calm before molten steel is outbound, slag specimen is taken, N and T [O] in steel sample analysis steel is taken, Ca processing is not done before outbound；
(5) continuous casting working procedure：Molten steel overheat is controlled to be not more than 30 DEG C, 1500-1505 DEG C is poured into a mould, tundish temperature≤1481
DEG C, steel inclusion is controlled, prevents the nozzle clogging of low overheat casting cycle, it is accurate to control casting process Metal in Tundish temperature
Degree is stablized；Continuous casting working procedure is stirred using two-stage electromagnetic；The low pulling rate casting of weak cold；The later stage is poured into a mould, forbids ladle roughing slag；
(6) heating strand process：Ensure sufficient heating time and heating-up temperature, ensure that heating strand is uniform, carbide
Fully dissolving；
(7) high-pressure water descaling：The iron scale of casting billet surface is removed using the mechanical impact force of high pressure water；
(8) rolling process：Control into final rolling temperature and laying temperature, it is ensured that crystal grain is tiny, and poker is uniform；
(9) post-process：It is air-cooled using stelmor production line, obtain finished product.
In the step (2), finishing slag basicity 2.9-3.4, iron content is between 13%-18% in terminal slag, floating plug
It is stringent to control slag thickness ＜ 50mm in ladle with slag retaining cone joint pushing off the slag.
In the step (2), control steel oxygen in water [O] is molten, using highcasting speed, effectively avoids strong deoxidier aluminium, carbon
The addition of powder, increases yield of alloy.
In the step (3), finishing slag R2 is in 7-9, final slag composition：CaO=50-60%, SiO2 ＜ 10%, Al2O3=25-
30%, MgO=5-8%.
Deoxidier uses one kind in aluminum shot, carborundum, FeSi powder and calcium carbide in the step (3).
The soft blow time is in more than 30min in the step (4).
The low pulling rate casting of weak cold, specific water 0.65L/kg, pulling rate 1.6m/min in the step (5).
Stirred in the step (5) using two-stage electromagnetic, crystallizer electromagnetic stirring strength 350A, 2HZ；End electromagnetic agitation
Intensity 500A, 12HZ.
Heating strand process in the step (6), heating furnace bringing-up section temperature：1140-1160 DEG C, soaking zone temperature：
1220-1250 DEG C, tapping temperature：1080-1100℃；Bringing-up section heating time：70-100min, soaking zone heating time 70-
100min。
Controlled in the step (8) into final rolling temperature at 890-900 DEG C, laying temperature is controlled at 810-820 DEG C.
The beneficial effects of the invention are as follows：By strictly being controlled each production link in smelting and the operation of rolling, so that
Propose the process route of a set of more rational production GCr15 Bearing Steel Billets.Tried by small lot development and batch
System, square billet quality in kind reach design requirement, and chemical Composition Control is more satisfactory, and macrostructure is good, and inclusion content is relatively low,
Wire rod metallographic structure is normal, and carbide rank is relatively low.It is satisfied by national standard GB/T18254-2002《High-carbon-chromium bearing steel》And downstream
Customer requirement.
Embodiment
The present invention is described in further detail with reference to embodiment：
The production method of the GCr15 Bearing Steel Billets of the present invention, technological process are pushed up bottom for molten iron pretreatment → 120t and are answered
Blow converter → LF → VD → 150mm × 150mm billet casters (two sections of electromagnetic agitation techniques of band combined type) → high line strand
Heating → high-pressure water descaling → rolling → control is cold, includes the following steps：
(1) molten iron pre-processes：Select the molten iron that meets the requirements, carry out molten iron pretreatment desulfurizing, it is desirable to enter stove molten iron [S]≤
0.02%；
(2) top and bottom combined blown converter：Using double slag process, rifle position is rationally adjusted early period, stirred using the big bottom blowings of 450-500nm3/h
Mix, ensure that the fusing of clinker is all right, the middle and later periods uses 250-300nm3/h moderate strength bottom blowings, prevents slag getting dry, eventually
Point highcasting speed and pushing off the slag operation, carbon content control is in 0.1%-0.3%, red packet tapping, 1610-1640 DEG C of tapping temperature；
(3) LF refining：After molten steel enters the station, killing, makes white slag to electricity rapidly, adds CaO in two batches, is flowed depending on clinker
Property is adjusted with bauxite；
(4) VD vacuum outgas：Using 67Pa high vacuum time 15min, using soft blow pattern, after application of vacuum, take
Steel sample and slag specimen, weak mixing time 20-30min, forbids exposed molten steel face, and application of vacuum terminates, and residual aluminium content requires Als ＞
0.010%, it is 5 minutes calm before molten steel is outbound, slag specimen is taken, N and T [O] in steel sample analysis steel is taken, Ca processing is not done before outbound；
(5) continuous casting working procedure：Molten steel overheat is controlled to be not more than 30 DEG C, 1500-1505 DEG C is poured into a mould, tundish temperature≤1481
DEG C, steel inclusion is controlled, prevents the nozzle clogging of low overheat casting cycle, it is accurate to control casting process Metal in Tundish temperature
Degree is stablized；Continuous casting working procedure is stirred using two-stage electromagnetic；The low pulling rate casting of weak cold；The later stage is poured into a mould, forbids ladle roughing slag；
(6) heating strand process：Ensure sufficient heating time and heating-up temperature, ensure that heating strand is uniform, carbide
Fully dissolving；
(7) high-pressure water descaling：The iron scale of casting billet surface is removed using the mechanical impact force of high pressure water；
(8) rolling process：Control into final rolling temperature and laying temperature, it is ensured that crystal grain is tiny, and poker is uniform；
(9) post-process：It is air-cooled using stelmor production line, obtain finished product.
In the step (2), finishing slag basicity 2.9-3.4, iron content is between 13%-18% in terminal slag, floating plug
It is stringent to control slag thickness ＜ 50mm in ladle with slag retaining cone joint pushing off the slag.
In the step (2), control steel oxygen in water [O] is molten, using highcasting speed, effectively avoids strong deoxidier aluminium, carbon
The addition of powder, increases yield of alloy.
In the step (3), finishing slag R2 is in 7-9, final slag composition：CaO=50-60%, SiO2 ＜ 10%, Al2O3=25-
30%, MgO=5-8%.
Deoxidier uses one kind in aluminum shot, carborundum, FeSi powder and calcium carbide in the step (3).
The soft blow time is in more than 30min in the step (4).
The low pulling rate casting of weak cold, specific water 0.65L/kg, pulling rate 1.6m/min in the step (5).
Stirred in the step (5) using two-stage electromagnetic, crystallizer electromagnetic stirring strength 350A, 2HZ；End electromagnetic agitation
Intensity 500A, 12HZ.
Heating strand process in the step (6), heating furnace bringing-up section temperature：1140-1160 DEG C, soaking zone temperature：
1220-1250 DEG C, tapping temperature：1080-1100℃；Bringing-up section heating time：70-100min, soaking zone heating time 70-
100min。
Controlled in the step (8) into final rolling temperature at 890-900 DEG C, laying temperature is controlled at 810-820 DEG C.
The present invention is answered by modifying to the production technology of original GCr15 bearing steels and perfect using 120t tops bottom
Blow converter, 120tLF refining furnaces, 120t vacuum refining furnaces, 6 machine 6 of Comcast stream arc billet caster, stepping heat accumulating type add
Under conditions of the equipment such as hot stove, high-speed wire mill, new production technology is finally determined, improves continuous casting billet quality, reduce casting
Base cost, improves product quality.
Embodiment described above is merely to illustrate the technological thought and feature of the present invention, in the art its object is to make
Technical staff it will be appreciated that present disclosure and implementing according to this, it is impossible to the patent model of the present invention is only limited with the present embodiment
Enclose, i.e., the equal change or modification that all disclosed spirit is made, still fall in the scope of the claims of the present invention.
Claims (10)
1. a kind of production method of GCr15 Bearing Steel Billets, it is characterised in that include the following steps：
(1) molten iron pre-processes：Select the molten iron that meets the requirements, carry out molten iron pretreatment desulfurizing, it is desirable to enter stove molten iron [S]≤
0.02%；
(2) top and bottom combined blown converter：Using double slag process, rifle position is rationally adjusted early period, using the big bottom blowing stirrings of 450-500nm3/h, protect
The fusing of card clinker is all right, and the middle and later periods uses 250-300nm3/h moderate strength bottom blowings, prevents slag getting dry, and terminal is high to be drawn
Carbon and pushing off the slag operation, carbon content control is in 0.1%-0.3%, red packet tapping, 1610-1640 DEG C of tapping temperature；
(3) LF refining：After molten steel enters the station, killing, makes white slag to electricity rapidly, adds CaO in two batches, is used depending on slag fluidity
Bauxite adjusts；
(4) VD vacuum outgas：Using 67Pa high vacuum time 15min, using soft blow pattern, after application of vacuum, steel sample is taken
And slag specimen, weak mixing time 20-30min, forbids exposed molten steel face, and application of vacuum terminates, and residual aluminium content requires Al s ＞
0.010%, it is 5 minutes calm before molten steel is outbound, slag specimen is taken, N and T [O] in steel sample analysis steel is taken, Ca processing is not done before outbound；
(5) continuous casting working procedure：Molten steel overheat is controlled to be not more than 30 DEG C, 1500-1505 DEG C of cast, tundish temperature≤1481 DEG C, are controlled
Steel inclusion processed, prevents the nozzle clogging of low overheat casting cycle, accurate to control casting process molten steel temperature in tundish steady
It is fixed；Continuous casting working procedure is stirred using two-stage electromagnetic；The low pulling rate casting of weak cold；The later stage is poured into a mould, forbids ladle roughing slag；
(6) heating strand process：Ensure sufficient heating time and heating-up temperature, ensure that heating strand is uniform, carbide is abundant
Dissolving；
(7) high-pressure water descaling：The iron scale of casting billet surface is removed using the mechanical impact force of high pressure water；
(8) rolling process：Control into final rolling temperature and laying temperature, it is ensured that crystal grain is tiny, and poker is uniform；
(9) post-process：It is air-cooled using stelmor production line, obtain finished product.
2. the production method of GCr15 Bearing Steel Billets according to claim 1, it is characterised in that the step (2)
In, finishing slag basicity 2.9-3.4, iron content is between 13%-18% in terminal slag, floating plug and slag retaining cone joint pushing off the slag, sternly
Slag thickness ＜ 50mm in lattice control ladle.
3. the production method of GCr15 Bearing Steel Billets according to claim 1 or 2, it is characterised in that the step
(2) in, control steel oxygen in water [O] is molten, using highcasting speed, effectively avoids strong deoxidier aluminium, the addition of carbon dust, increase is closed
Golden recovery rate.
4. the production method of GCr15 Bearing Steel Billets according to claim 1, it is characterised in that the step (3)
In, finishing slag R2 is in 7-9, final slag composition：CaO=50-60%, SiO2 ＜ 10%, Al2O3=25-30%, MgO=5-8%.
5. the production method of GCr15 Bearing Steel Billets according to claim 1, it is characterised in that in the step (3)
Deoxidier uses one kind in aluminum shot, carborundum, FeSi powder and calcium carbide.
6. the production method of GCr15 Bearing Steel Billets according to claim 1, it is characterised in that in the step (4)
The soft blow time is in more than 30min.
7. the production method of GCr15 Bearing Steel Billets according to claim 1, it is characterised in that in the step (5)
The low pulling rate casting of weak cold, specific water 0.65L/kg, pulling rate 1.6m/min.
8. the production method of GCr15 Bearing Steel Billets according to claim 1, it is characterised in that in the step (5)
Stirred using two-stage electromagnetic, crystallizer electromagnetic stirring strength 350A, 2HZ；End electromagnetic agitation intensity 500A, 12HZ.
9. the production method of GCr15 Bearing Steel Billets according to claim 1, it is characterised in that in the step (6)
Heating strand process, heating furnace bringing-up section temperature：1140-1160 DEG C, soaking zone temperature：1220-1250 DEG C, tapping temperature：
1080-1100℃；Bringing-up section heating time：70-100min, soaking zone heating time 70-100min.
10. the production method of GCr15 Bearing Steel Billets according to claim 1, it is characterised in that the step (8)
In into final rolling temperature control at 890-900 DEG C, laying temperature is controlled at 810-820 DEG C.
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| CN201711312719.9A CN108004456A (en) | 2017-11-29 | 2017-11-29 | A kind of production method of GCr15 Bearing Steel Billets |
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| CN201711312719.9A CN108004456A (en) | 2017-11-29 | 2017-11-29 | A kind of production method of GCr15 Bearing Steel Billets |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108660292A (en) * | 2018-05-24 | 2018-10-16 | 承德建龙特殊钢有限公司 | A method of producing high-alloy steel |
| CN108842028A (en) * | 2018-08-31 | 2018-11-20 | 承德建龙特殊钢有限公司 | A kind of method of Ti content in reduction bearing steel |
| CN110125356A (en) * | 2019-04-26 | 2019-08-16 | 首钢集团有限公司 | A kind of continuous small-billet casting production method of drilling tool cored steel |
| CN110527909A (en) * | 2019-09-11 | 2019-12-03 | 本钢板材股份有限公司 | A kind of preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J |
| CN110791611A (en) * | 2019-10-15 | 2020-02-14 | 邯郸钢铁集团有限责任公司 | Method for solving problem of blockage of pouring nozzle of high-carbon chromium bearing steel produced by billet continuous casting machine |
| CN114774619A (en) * | 2022-04-29 | 2022-07-22 | 中国铁建重工集团股份有限公司 | Low-nitrogen high-carbon chromium bearing steel and production method thereof |
-
2017
- 2017-11-29 CN CN201711312719.9A patent/CN108004456A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108660292A (en) * | 2018-05-24 | 2018-10-16 | 承德建龙特殊钢有限公司 | A method of producing high-alloy steel |
| CN108842028A (en) * | 2018-08-31 | 2018-11-20 | 承德建龙特殊钢有限公司 | A kind of method of Ti content in reduction bearing steel |
| CN110125356A (en) * | 2019-04-26 | 2019-08-16 | 首钢集团有限公司 | A kind of continuous small-billet casting production method of drilling tool cored steel |
| CN110527909A (en) * | 2019-09-11 | 2019-12-03 | 本钢板材股份有限公司 | A kind of preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J |
| CN110791611A (en) * | 2019-10-15 | 2020-02-14 | 邯郸钢铁集团有限责任公司 | Method for solving problem of blockage of pouring nozzle of high-carbon chromium bearing steel produced by billet continuous casting machine |
| CN114774619A (en) * | 2022-04-29 | 2022-07-22 | 中国铁建重工集团股份有限公司 | Low-nitrogen high-carbon chromium bearing steel and production method thereof |
| CN114774619B (en) * | 2022-04-29 | 2023-10-24 | 中国铁建重工集团股份有限公司 | Low-nitrogen high-carbon chromium bearing steel and production method thereof |
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Application publication date: 20180508 |