Title:
CONTINUOUSLY CAST GCR15 BEARING STEEL WIRE ROD CARBIDE NETWORK CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2021/057218
Kind Code:
A1
Abstract:
A continuously cast GCr15 bearing steel wire rod carbide network control method. The control method performs design optimization of chemical components of GCr15; before being put into use, a steel billet is evaluated and graded according to a superheating temperature and a macrostructure, feed specifications are clarified according to a billet grading, and special control of a heating process is performed, wherein a high-temperature time period having a furnace temperature ≥1150°C is appropriately extended and a rolling starting temperature is appropriately raised for a downgraded billet, and efforts are made to ease billet segregation under long high-temperature diffusion conditions; a coil air cooling process is improved, a coil in the air cooling process is adjusted according to a specified size, rapid cooling from a laying temperature to 700°C or below is performed, and the coil is kept at approximately 630-700°C for a set period of time before entering a cover again, thereby implementing effective carbide network control.
Inventors:
XIAO XUNJUN (CN)
PENG XUEYI (CN)
ZHAO HAIYANG (CN)
REN XUETANG (CN)
ZHAO ZHANGFA (CN)
PENG XUEYI (CN)
ZHAO HAIYANG (CN)
REN XUETANG (CN)
ZHAO ZHANGFA (CN)
Application Number:
PCT/CN2020/103452
Publication Date:
April 01, 2021
Filing Date:
July 22, 2020
Export Citation:
Assignee:
NANJING IRON & STEEL CO LTD (CN)
International Classes:
C21D8/02; C21D6/00; C21D9/52; C21D11/00; C22C38/04
Domestic Patent References:
| WO2017222122A1 | 2017-12-28 |
Foreign References:
| CN110643798A | 2020-01-03 | |||
| CN105817487A | 2016-08-03 | |||
| CN105648170A | 2016-06-08 | |||
| CN108465759A | 2018-08-31 | |||
| CN107385175A | 2017-11-24 | |||
| CN103468904A | 2013-12-25 | |||
| CN101586182A | 2009-11-25 | |||
| JP2011208201A | 2011-10-20 |
Other References:
SHEN, YONGGUO: "Discussion on the Quality of Carbide Network in GCr15 Bearing Steel", SICHUAN METALLURGY, no. 3, 31 December 1989 (1989-12-31), pages 22 - 25, XP055796769
Attorney, Agent or Firm:
NANJING SUGAO PATENT AND TRADEMARK FIRM ( ORDINARY PARTNERSHIP ) (CN)
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