Title:
COLD FORGED GEAR STEEL AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/184087
Kind Code:
A1
Abstract:
Disclosed is a cold forged gear steel. In addition to Fe and inevitable impurities, the cold forged gear steel further comprises the following chemical elements in percentage by mass: 0.15-0.17% of C, 0.10-0.20% of Si, 1.0-1.10% of Mn, 0.80-0.90% of Cr, and 0.02-0.04% of Al. Correspondingly, further disclosed is a manufacturing method for the cold forged gear steel, comprising the following steps: (1) smelting and casting; (2) heating; (3) forging or rolling; (4) spheroidizing annealing: heating to 750-770°C and maintaining the temperature, cooling at a cooling speed of 5-15°C/h to 700-720°C and maintaining the temperature, cooling at a cooling speed of 3-12°C/h to 660-680°C and maintaining the temperature, then cooling at a cooling speed of 5-20°C/h to below 500°C, and then cooling outside a furnace.
Inventors:
ZHANG JUN (CN)
ZHAO SIXIN (CN)
GAO JIAQIANG (CN)
WANG WEI (CN)
ZHAO SIXIN (CN)
GAO JIAQIANG (CN)
WANG WEI (CN)
Application Number:
PCT/CN2022/078754
Publication Date:
September 09, 2022
Filing Date:
March 02, 2022
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/02; C21D8/02; C22C38/00
Foreign References:
| JP2013057114A | 2013-03-28 | |||
| JP2000265240A | 2000-09-26 | |||
| CN111424219A | 2020-07-17 | |||
| CN107923011A | 2018-04-17 | |||
| JP2019011510A | 2019-01-24 | |||
| JP2017020065A | 2017-01-26 |
Attorney, Agent or Firm:
WATSON & BAND INTELLECTUAL PROPERTY AGENT LTD. (CN)
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