CN106702099A - Large-size 42 CrMo4 hardened and tempered steel manufacturing process for wind power gearbox outer main shaft - Google Patents
Large-size 42 CrMo4 hardened and tempered steel manufacturing process for wind power gearbox outer main shaft Download PDFInfo
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- CN106702099A CN106702099A CN201710037112.8A CN201710037112A CN106702099A CN 106702099 A CN106702099 A CN 106702099A CN 201710037112 A CN201710037112 A CN 201710037112A CN 106702099 A CN106702099 A CN 106702099A
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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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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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
- C21D1/28—Normalising
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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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Abstract
The invention discloses a tempered steel 42 CrMo4 manufacturing process for a wind power main shaft with the diameter not smaller than 450 mm, and the technical aims of high intensity, high tenacity and stable mechanical property of large and round tempered steel are achieved. According to the technical scheme, the manufacturing process is characterized in that (1) the process route includes operation through electric furnace + LF + VD, die casting, forging (through a 3500t high-speed forging machine), normalization and tempering; and (2) by optimizing the internal control ingredients, the mechanical property of the steel is guaranteed to be stable, intensified elements such as vanadium, niobium and nickel are added into smelting ingredients, and the steel intensity is improved; through pretreatment before tempering, normalizing is carried out the steel to homogenize the texture and refine grains, and the good impact toughness is obtained after tempering; and temper brittlement is avoided through air cooling of tempered furnace discharge steel. The tempered steel 42 CrMo4 manufacturing process has the beneficial effects that the stable and qualified mechanical property of the large and round tempered steel is achieved, the strength of extension (Rm) ranges from 760 MPa to 910 MPa, the yield strength (Re) is not smaller than 535 MPa, the percentage reduction of area (A) is not smaller than 15%, the impact absorbing energy (AkV) is not smaller than 38 J; and the impact toughness is improved.
Description
Technical field
The invention belongs to metal material manufacture field, it is related to the outer steel for main shaft manufacturing process of wind power speed-increasing gearbox, is mainly used in
The production of big specification (>=Φ 450mm) 42CrMo4 quenched and tempered steel.
Background technology
Wind power principal axis are to connect the hollow shaft of gear-box and fan blade runner, it is necessary to have good combination property, because
This steel for wind power spindle should have high intensity and good impact flexibility；As wind-powered electricity generation industry is developed rapidly, to wind power speed-increasing gearbox
Outer steel for main shaft proposes requirement higher, especially the intensity requirement in mechanical performance.At present, the outer main shaft of wind power speed-increasing gearbox is used
42CrMo4 quenched and tempered steel specification is not less than Φ 450mm, and intensity, toughness reguirements are high, and mechanical performance index is tighter, it is desirable to away from surface 1/3
Radial location mechanical performance：Tensile strength (Rm) is 760MPa~910MPa, and yield strength (Re) is not less than 535MPa, and section is received
Shrinkage (A) is not less than 15%, and impact absorbing energy (AkV) is not less than 38J, and existing production technology process is difficult to meet big specification
The technical requirements of 42CrMo4 quenched and tempered steel, and have no that home and abroad document has the report of correlative study.
The content of the invention
The present invention discloses a kind of wind power speed-increasing gearbox big specification 42CrMo4 quenched and tempered steel manufacturing process of outer main shaft, by optimization
Internal control composition ensures steel mechanics performance stabilization；By quenched preceding pretreatment, normalizing is carried out to steel and comes uniform formation, refined
Crystal grain, the good impact flexibility of quenched rear acquisition；By coming out of the stove to tempering, steel are air-cooled to avoid temper brittleness.
To achieve the above object, the present invention is adopted the following technical scheme that：
1. process route：Electric furnace+LF+VD → molding → forging (3500t quick forging machines) → normalized treatment → quenched.
2. concrete technology system：
(1) process for making
1. chemical composition
42CrMo4 steel chemical composition inner quality standards are shown in Table 1；
Table 1
2. using electric furnace+LF+VD steel-making, it is ensured that steel ingot pure interior degree and composition are uniform.
(2) forging technology
1200 DEG C~1220 DEG C insulation 5h~8h sides can come out of the stove pressing tongs, jumping-up, the complete reheating in furnace of upsetting, 1180 DEG C~1200
DEG C insulation 3h~5h, pulling of coming out of the stove, 850 DEG C~900 DEG C of final forging temperature, finished product material forge after dehydrogenation.
(3) normalizing process
880 DEG C ± 10 DEG C are warming up to be not more than 100 DEG C/h speed, 10h~12h is incubated, are come out of the stove be air cooled to 400 DEG C afterwards
Below.
(4) hardening and tempering process
860 DEG C ± 10 DEG C being warming up to be not more than 80 DEG C/h speed, being incubated 8h~12h, steel are come out of the stove quenching, steel are come out of the stove
It is not more than 4min to hardening time interval；Hardening process wants the multistep to carry out, it is stipulated that as follows：The first step：Immersion 3min；Second step：
Air cooling 40s；3rd step：Immersion 2min；4th step：Air cooling 50s；5th step：Immersion 55min；The built-in electric furnaces of 1h~2h after quenching
It is tempered, 300 DEG C ± 50 DEG C of furnace temperature is waited to expect, is then warming up to 625 DEG C of insulation 35h to be not more than 60 DEG C/h speed；Steel are tempered out
Single pendulum is hung out after stove air-cooled, it is air-cooled to below 150 DEG C of material temperature.
3. physicochemical property
(1) non-metallic inclusion presses the inspection of ISO4967 A methods, and qualified rank should meet table 2 and specify；
Table 2
(2) grain size carries out autstenitic grain size inspection by ISO643, and assay is not less than 5 grades.
(3) mechanical property should meet table 3 and specify.
Table 3
| Specification | Re(MPa) | Rm(MPa) | A (%) | AkV(J) | HBW |
| 390~500 | ≥535 | 760~910 | ≥15 | ≥38 | 225~270 |
Innovative point of the invention is：
(1) the intensified element such as smelting component addition vanadium, niobium and nickel, improves the intensity of steel；
(2) big specification steel are carried out with normalizing, uniform formation, crystal grain thinning, to obtain before quenched
Impact flexibility；
(3) steel tempering is all hung down air-cooled after coming out of the stove, and is cooled to less than 150 DEG C, it is to avoid temper brittleness.
It is of the invention helpful to be：Ensure stable mechanical property by controlling chemical composition and quenched preceding preconditioning technique
It is qualified；Normalizing is implemented to big specification steel before quenched, uniform formation has refined crystal grain, and the impact flexibility to quenched rear steel has
Certain improvement；Steel tempering is air-cooled after coming out of the stove, it is to avoid steel temper brittleness, the impact flexibility for solving great circle quenched and tempered steel is asked
Topic.
Brief description of the drawings
Fig. 1 is steel normalizing process curve；
Fig. 2 is steel quenching technical curve；
Fig. 3 is steel tempering process curve.
Specific embodiment
The present invention is elaborated with reference to specific embodiment.
Embodiment 1, embodiment 2, embodiment 3 use same technological process：
Electric furnace+LF+VD → molding → forging (3500t quick forging machines) → normalized treatment → quenched；
Embodiment 1
Heat (batch) number：16203011728, round steel trimmed size Φ 500mm
1. production technology
(1) process for making
1. chemical composition is shown in Table 4.
Table 4
(2) forging technology
1210 DEG C of insulation 7h come out of the stove pressing tongs, jumping-up, the complete reheating in furnace of upsetting, 1180 DEG C of insulation 4h, pulling of coming out of the stove, finish-forging temperature
870 DEG C of degree, dehydrogenation after the forging of finished product material.
(3) normalizing process
As shown in figure 1, being warming up to 880 DEG C of insulation 11h to be not more than 100 DEG C/h speed, steel are come out of the stove and are air cooled to 400 afterwards
Below DEG C.
(4) hardening and tempering process
As shown in Fig. 2 being warming up to 865 DEG C to be not more than 80 DEG C/h speed, 10h is incubated, when steel go out glowing furnace to hardening
Between be spaced 4min；Hardening water is empty alternately, the first step：Immersion 3min；Second step：Air cooling 40s；3rd step：Immersion 2min；The
Four steps：Air cooling 50s；5th step：Immersion 55min；The built-in electric furnace tempering of 1.5h after quenching, as shown in figure 3,300 DEG C of furnace temperature is waited to expect,
Then 618 DEG C of insulation 35h are warming up to be not more than 60 DEG C/h speed；It is air-cooled that steel tempering hangs out single pendulum after coming out of the stove, air-cooled to expecting
Less than 150 DEG C of temperature.
2. production testing result
(1) the examination of nonmetallic inclusion is shown in Table 5.
Table 5
(2) grain size carries out autstenitic grain size inspection, 7 grades~6 grades of assay by ISO643.
(3) mechanical properties test is shown in Table 6.
Table 6
| Specification | Re(MPa) | Rm(MPa) | A (%) | AkV(J) | HBW |
| φ500 | 679/670 | 858/857 | 19/19 | 68/78.3/56 | 258/256 |
Embodiment 2
Heat (batch) number：16203021229, round steel trimmed size Φ 500mm.
1. production technology
(1) process for making
Chemical composition is shown in Table 7.
Table 7
(2) forging technology
1220 DEG C of insulation 5h come out of the stove pressing tongs, jumping-up, the complete reheating in furnace of upsetting, 1190 DEG C of insulation 4h, pulling of coming out of the stove, finish-forging temperature
860 DEG C of degree, dehydrogenation after the forging of finished product material.
(3) normalizing process
As shown in figure 1, being warming up to 885 DEG C of insulation 11h to be not more than 100 DEG C/h speed, steel are come out of the stove and are air cooled to 400 afterwards
Below DEG C.
(4) hardening and tempering process
As shown in Fig. 2 being warming up to 858 DEG C to be not more than 80 DEG C/h speed, 8h is incubated, steel go out glowing furnace to hardening time
Interval 4min；Hardening water is empty alternately, the first step：Immersion 3min；Second step：Air cooling 40s；3rd step：Immersion 2min；4th
Step：Air cooling 50s；5th step：Immersion 55min；2h dresses electric furnace tempering after quenching, as shown in figure 3,320 DEG C of furnace temperature is waited to expect, then with
No more than 60 DEG C/h speed is warming up to 625 DEG C of insulation 35h；It is air-cooled that steel tempering hangs out single pendulum after coming out of the stove, air-cooled to 150 DEG C of material temperature
Below.
2. production testing result
(1) the examination of nonmetallic inclusion is shown in Table 8.
Table 8
(2) grain size carries out autstenitic grain size inspection, 7 grades~6 grades of assay by ISO643.
(3) mechanical properties test is shown in Table 9.
Table 9
| Specification | Re(MPa) | Rm(MPa) | A (%) | AkV(J) | HBW |
| φ500 | 667/663 | 853/856 | 16/16.5 | 59.2/60.7/60 | 257/259 |
Embodiment 3
Heat (batch) number：16203011366, round steel trimmed size Φ 500mm.
1. production technology
(1) process for making
Finished product composition is shown in Table 10.
Table 10
(2) forging technology
1200 DEG C of insulation 8h come out of the stove pressing tongs, jumping-up, the complete reheating in furnace of upsetting, 1180 DEG C of insulation 5h, pulling of coming out of the stove, finish-forging temperature
880 DEG C of degree, dehydrogenation after the forging of finished product material.
(3) normalizing process
As shown in figure 1, being warming up to 878 DEG C of insulation 10h to be not more than 100 DEG C/h speed, steel are come out of the stove and are air cooled to 400 afterwards
Below DEG C.
(4) hardening and tempering process
As shown in Fig. 2 being warming up to 852 DEG C to be not more than 80 DEG C/h speed, 12h is incubated, when steel go out glowing furnace to hardening
Between be spaced 4min；Hardening water is empty alternately, the first step：Immersion 3min；Second step：Air cooling 40s；3rd step：Immersion 2min；The
Four steps：Air cooling 50s；5th step：Immersion 55min；The built-in electric furnace tempering of 1.5h after quenching, as shown in figure 3,280 DEG C of furnace temperature is waited to expect,
Then 628 DEG C of insulation 35h are warming up to be not more than 60 DEG C/h speed；It is air-cooled that steel tempering hangs out single pendulum after coming out of the stove, air-cooled to expecting
Less than 150 DEG C of temperature.
2. production testing result
(1) the examination of nonmetallic inclusion is shown in Table 11.
Table 11
(2) grain size carries out autstenitic grain size inspection, 8 grades of assay by ISO643.
(3) mechanical properties test is shown in Table 12.
Table 12
Claims (4)
1. a kind of outer main shaft of wind power speed-increasing gearbox is with big specification 42CrMo4 quenched and tempered steel manufacturing process, it is characterised in that：Manufacturing process skill
Art scheme：(1) process route：Electric furnace+LF+VD → molding → forging (3500t quick forging machines) → normalized treatment → quenched；(2) pass through
Optimization internal control composition strictly controls steel chemical composition close limit, to ensure that steel mechanics performance is stable, smelting component addition vanadium,
The intensified elements such as niobium, nickel, improve the intensity of steel；By quenched preceding pretreatment, normalizing is carried out to steel and comes uniform formation, carefully
Change crystal grain, the good impact flexibility of quenched rear acquisition；By coming out of the stove to tempering, steel are air-cooled to avoid temper brittleness.
The chemical composition (%)：Carbon：0.38~0.45, silicon：No more than 0.04, manganese：0.60~0.80, chromium：0.90~1.20,
Molybdenum：0.15~0.30, phosphorus：No more than 0.025, sulphur：No more than 0.035, oxygen:No more than 0.0025, hydrogen：No more than 0.0002；
Internal control composition (%)：Carbon：0.42~0.44, silicon：0.30~0.38, manganese：0.82~0.88, chromium：1.12~1.18, molybdenum：
0.25~0.28, phosphorus：No more than 0.010, sulphur：No more than 0.010, aluminium:0.015~0.035, oxygen:No more than 0.002, vanadium:
0.03~0.05, niobium:0.015~0.03, nickel:0.25~0.29；
The forging, 1200 DEG C~1220 DEG C insulation 5h~8h sides can come out of the stove pressing tongs, jumping-up, the complete reheating in furnace of upsetting, 1180 DEG C
~1200 DEG C of insulation 3h~5h, pulling of coming out of the stove, 850 DEG C~900 DEG C of final forging temperature, dehydrogenation after the forging of finished product material；
The normalized treatment, 880 DEG C ± 10 DEG C are warming up to be not more than 100 DEG C/h speed, are incubated 10h~12h, sky of coming out of the stove afterwards
It is cooled to less than 400 DEG C；
It is described quenched, it is warming up to 860 DEG C ± 10 DEG C to be not more than 80 DEG C/h speed, it is incubated 8h~12h, steel are come out of the stove quenching, steel
Material is come out of the stove to hardening time interval no more than 4min；Hardening process wants the multistep to carry out, it is stipulated that as follows：The first step：Immersion 3min；The
Two steps：Air cooling 40s；3rd step：Immersion 2min；4th step：Air cooling 50s；5th step：Immersion 55min；1h~2 hour after quenching
Built-in electric furnace is tempered, and 300 DEG C ± 50 DEG C of furnace temperature is waited to expect, is then warming up to 625 DEG C of insulation 35h to be not more than 60 DEG C/h speed；Steel
It is air-cooled that material tempering hangs out single pendulum after coming out of the stove, air-cooled to below 150 DEG C of material temperature.
2. according to claim 1 the outer main shaft of wind power speed-increasing gearbox with big specification 42CrMo4 quenched and tempered steel manufacturing process, its feature exists
In：Chemical composition (%)：Carbon：0.43, silicon：0.32, manganese：0.85, chromium：1.12, molybdenum：0.26, phosphorus：0.009, sulphur：
0.005, aluminium:0.032, oxygen:0.0018, hydrogen：0.0001, vanadium:0.04, niobium:0.019, nickel:0.26；
The forging, 1210 DEG C of insulation 7h come out of the stove pressing tongs, jumping-up, the complete reheating in furnace of upsetting, 1180 DEG C of insulation 4h, pulling of coming out of the stove,
870 DEG C of final forging temperature, dehydrogenation after the forging of finished product material；
The normalized treatment is warming up to 880 DEG C of insulation 11h to be not more than 100 DEG C/h speed, and steel are come out of the stove and are air cooled to 400 DEG C afterwards
Below；
It is described it is quenched be warming up to 865 DEG C to be not more than 80 DEG C/h speed, be incubated 10h, steel go out glowing furnace to hardening time interval
4min；Hardening water is empty alternately, the first step：Immersion 3min；Second step：Air cooling 40s；3rd step：Immersion 2min；4th step：
Air cooling 50s；5th step：Immersion 55min；1.5h built-in electric furnaces tempering after quenching, 300 DEG C of furnace temperature waits to expect, then being not more than 60
DEG C/h speed be warming up to 618 DEG C insulation 35h；It is air-cooled that steel tempering hangs out single pendulum after coming out of the stove, air-cooled to below 150 DEG C of material temperature.
3. according to claim 1 the outer main shaft of wind power speed-increasing gearbox with big specification 42CrMo4 quenched and tempered steel manufacturing process, its feature exists
In：Chemical composition (%)：Carbon：0.42, silicon：0.32, manganese：0.87, chromium：1.13, molybdenum：0.26, phosphorus：0.009, sulphur：
0.005, aluminium:0.032, oxygen:0.002, hydrogen：0.0001, vanadium:0.04, niobium:0.017, nickel:0.27；
The forging, 1220 DEG C of insulation 5h come out of the stove pressing tongs, jumping-up, the complete reheating in furnace of upsetting, 1190 DEG C of insulation 4h, pulling of coming out of the stove,
860 DEG C of final forging temperature, dehydrogenation after the forging of finished product material；
The normalized treatment is warming up to 885 DEG C of insulation 11h to be not more than 100 DEG C/h speed, and steel are come out of the stove and are air cooled to 400 DEG C afterwards
Below；
It is described it is quenched be warming up to 858 DEG C to be not more than 80 DEG C/h speed, be incubated 8h, steel go out glowing furnace to hardening time interval
4min；Hardening water is empty alternately, the first step：Immersion 3min；Second step：Air cooling 40s；3rd step：Immersion 2min；4th step：
Air cooling 50s；5th step：Immersion 55min；2h dresses electric furnace tempering after quenching, 320 DEG C of furnace temperature waits to expect, then being not more than 60 DEG C/h
Speed is warming up to 625 DEG C of insulation 35h；It is air-cooled that steel tempering hangs out single pendulum after coming out of the stove, air-cooled to below 150 DEG C of material temperature.
4. according to claim 1 the outer main shaft of wind power speed-increasing gearbox with big specification 42CrMo4 quenched and tempered steel manufacturing process, its feature exists
In：Chemical composition (%)：Carbon：0.425, silicon：0.3, manganese：0.82, chromium：1.12, molybdenum：0.25, phosphorus：0.008, sulphur：
0.003, aluminium:0.03, oxygen:0.0015, hydrogen：0.0001, vanadium:0.04, niobium:0.022 nickel:0.26；
The forging, 1200 DEG C of insulation 8h come out of the stove pressing tongs, jumping-up, the complete reheating in furnace of upsetting, 1180 DEG C of insulation 5h, pulling of coming out of the stove,
880 DEG C of final forging temperature, dehydrogenation after the forging of finished product material；
The normalized treatment is warming up to 878 DEG C of insulation 10h to be not more than 100 DEG C/h speed, and steel are come out of the stove and are air cooled to 400 DEG C afterwards
Below；
It is described it is quenched be warming up to 852 DEG C to be not more than 80 DEG C/h speed, be incubated 12h, steel go out glowing furnace to hardening time interval
4min；Hardening water is empty alternately, the first step：Immersion 3min；Second step：Air cooling 40s；3rd step：Immersion 2min；4th step：
Air cooling 50s；5th step：Immersion 55min；1.5h built-in electric furnaces tempering after quenching, 280 DEG C of furnace temperature waits to expect, then being not more than 60
DEG C/h speed be warming up to 628 DEG C insulation 35h；It is air-cooled that steel tempering hangs out single pendulum after coming out of the stove, air-cooled to below 150 DEG C of material temperature.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107815588A (en) * | 2017-10-10 | 2018-03-20 | 张家港中环海陆特锻股份有限公司 | Wind power generating set yawing gear ring manufacturing process |
| CN107858590A (en) * | 2017-10-19 | 2018-03-30 | 中国科学院金属研究所 | A kind of 42CrMo4 wind driven generator principal shafts control method |
| CN108384936A (en) * | 2018-02-13 | 2018-08-10 | 无锡宏达重工股份有限公司 | A kind of processing technology of wind turbine gearbox carburizing steel heat treatment after forging |
| CN109338059A (en) * | 2018-12-05 | 2019-02-15 | 无锡继平锻造有限公司 | A kind of forging and heat treatment process of mode locking column forging |
| CN112251572A (en) * | 2020-08-31 | 2021-01-22 | 伊莱特能源装备股份有限公司 | Manufacturing method of high-performance wind driven generator bearing retainer forging |
| CN113770316A (en) * | 2021-08-19 | 2021-12-10 | 山西太钢不锈钢股份有限公司 | Method for improving low-carbon, low-aluminum and high-chromium steel forging circle flaw detection qualification rate |
| CN113814679A (en) * | 2021-09-24 | 2021-12-21 | 江苏裕隆锻造有限公司 | Processing method for overcoming crack defect of 50Mn rotary gear ring |
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| CN102041456A (en) * | 2009-10-21 | 2011-05-04 | 宝山钢铁股份有限公司 | Steel for wind power spindle and manufacturing method thereof |
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| CN113814679A (en) * | 2021-09-24 | 2021-12-21 | 江苏裕隆锻造有限公司 | Processing method for overcoming crack defect of 50Mn rotary gear ring |
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