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1. (WO2018107316) HEAT TREATMENT METHOD FOR ULTRA-HIGH-CARBON BEARING STEEL

Pub. No.:    WO/2018/107316    International Application No.:    PCT/CN2016/109410
Publication Date: Fri Jun 22 01:59:59 CEST 2018 International Filing Date: Tue Dec 13 00:59:59 CET 2016
IPC: C22C 38/56
C22C 38/54
C22C 38/46
C22C 38/50
C22C 38/44
C22C 38/06
C22C 38/04
C22C 38/02
C21D 1/18
C21D 1/26
C21D 1/28
C23C 8/66
Applicants: MA, Fei
马飞
Inventors: MA, Fei
马飞
Title: HEAT TREATMENT METHOD FOR ULTRA-HIGH-CARBON BEARING STEEL
Abstract:
A heat treatment method for ultra-high-carbon bearing steel. The bearing steel comprises the components of: C: 1.5%-2.5%; Mn: 0.6%-1.2%; V: 0.01%-0.1%; B: 0.1%-1.0%; Be: 0.1%-0.24%; Ni: 0.2%-1.8%; Si: 1.2%-1.8%; Ti: 0.4%-0.8%; W: 0.05%-0.08%; Cr: 2.5%-4.5%; Al: 0.12%-0.16%; Re: 0.05%-0.16%; and the balance of Fe. The heat treatment method comprises: annealing, normalizing, primary quenching, secondary quenching, and tempering. The heat treatment method improves the toughness of the bearing steel without reducing the hardness thereof, and increases the contact fatigue life of the bearing steel.