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Large-size 42 CrMo4 hardened and tempered steel manufacturing process for wind power gearbox outer main shaft

A manufacturing process and speed-increasing box technology, which is applied in the production field of large-scale 42CrMo4 quenched and tempered steel, can solve the problems that the production technology process is difficult to meet the technical requirements, achieve stable and qualified mechanical properties, solve the problem of impact toughness, and refine grains Effect

Active Publication Date: 2017-05-24
FUSHUN SPECIAL STEEL SHARES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the specification of 42CrMo4 quenched and tempered steel used for the outer main shaft of the wind power gearbox is not less than Φ450mm, the requirements for strength and toughness are high, and the mechanical performance indicators are relatively strict. 910MPa, yield strength (Re) not less than 535MPa, reduction of area (A) not less than 15%, impact absorption energy (AkV) not less than 38J, the existing production technology is difficult to meet the technical requirements of large-scale 42CrMo4 quenched and tempered steel, and There is no report of relevant research in domestic and foreign literature

Method used

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  • Large-size 42 CrMo4 hardened and tempered steel manufacturing process for wind power gearbox outer main shaft
  • Large-size 42 CrMo4 hardened and tempered steel manufacturing process for wind power gearbox outer main shaft
  • Large-size 42 CrMo4 hardened and tempered steel manufacturing process for wind power gearbox outer main shaft

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1, embodiment 2, embodiment 3 adopt the same technological process:

[0038] Electric furnace+LF+VD→die casting→forging (3500t fast forging machine)→normalizing treatment→quenching and tempering;

[0039] Example 1

[0040] Heat number: 16203011728, finished round steel specification Φ500mm

[0041] 1. Production process

[0042] ⑴Steelmaking process

[0043] ①The chemical composition of the finished product is shown in Table 4.

[0044] Table 4

[0045]

[0046] ⑵ forging process

[0047] Hold at 1210°C for 7h, press the clamp handle, upsetting, return to the furnace after upsetting, hold at 1180°C for 4h, draw out and elongate, the final forging temperature is 870°C, and the finished product is dehydrogenated and annealed after forging.

[0048] ⑶ normalizing process

[0049] like figure 1 As shown in the figure, the temperature was raised to 880°C for 11 hours at a rate of no more than 100°C / h, and then the steel was air-cooled to below 400°C. ...

Embodiment 2

[0061] Heat number: 16203021229, the finished round steel specification is Φ500mm.

[0062] 1. Production process

[0063] ⑴Steelmaking process

[0064] The chemical composition of the finished product is shown in Table 7.

[0065] Table 7

[0066]

[0067] ⑵ forging process

[0068] Hold at 1220°C for 5h, press the clamp handle, upsetting, return to the furnace after upsetting, hold at 1190°C for 4h, draw out and elongate, the final forging temperature is 860°C, and the finished product is dehydrogenated and annealed after forging.

[0069] ⑶ normalizing process

[0070] like figure 1 As shown in the figure, the temperature is raised to 885°C at a rate of no more than 100°C / h for 11 hours, and then the steel is released from the furnace and air-cooled to below 400°C.

[0071] ⑷ Quenching and tempering process

[0072] like figure 2 As shown in the figure, the temperature is raised to 858°C at a rate of not more than 80°C / h, and the temperature is kept for 8 hours...

Embodiment 3

[0082] Heat number: 16203011366, the finished round steel specification is Φ500mm.

[0083] 1. Production process

[0084] ⑴Steelmaking process

[0085] The composition of the finished product is shown in Table 10.

[0086] Table 10

[0087]

[0088] ⑵ forging process

[0089] Hold at 1200°C for 8h, press the clamp handle, upsetting, return to the furnace after upsetting, hold at 1180°C for 5h, draw out and elongate, the final forging temperature is 880°C, and the finished product is dehydrogenated and annealed after forging.

[0090] ⑶ normalizing process

[0091] like figure 1 As shown in the figure, the temperature was raised to 878°C for 10h at a rate of not more than 100°C / h, and then the steel was air-cooled to below 400°C.

[0092] ⑷ Quenching and tempering process

[0093] like figure 2 As shown in the figure, the temperature is raised to 852°C at a rate of no more than 80°C / h, and the temperature is kept for 12 hours. The time interval between the quenchi...

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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 [0001] The invention belongs to the field of metal material manufacturing, and relates to a manufacturing process of steel for an outer main shaft of a wind power speed-increasing box, which is mainly used for the production of large-sized (≥Φ450mm) 42CrMo4 quenched and tempered steel. Background technique [0002] The wind power spindle is a hollow shaft connecting the gearbox and the fan blade runner, and needs to have good comprehensive performance. Therefore, the steel used for the wind power spindle should have high strength and good impact toughness; The steel for the main shaft puts forward higher requirements, especially the strength requirements in the mechanical properties. At present, the specification of 42CrMo4 quenched and tempered steel for the outer main shaft of the wind power speed-increasing box is not less than Φ450mm, with high strength and toughness requirements, and strict mechanical performance indicators. 910MPa, the yield strength (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/25C21D1/28C21D6/00C21D8/00
CPCC21D1/25C21D1/28C21D6/004C21D6/005C21D6/008C21D8/005
Inventor 张龙冯桂萍刘金鑫赵智刚顾文涛马群申林
Owner FUSHUN SPECIAL STEEL SHARES
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