US 12,234,522 B2
Method for controlling carbide network in a bearing steel wire rod by controlling cooling and controlling rolling
Lin Zhang, Jiangsu (CN); Jianfeng Zhang, Jiangsu (CN); Changhe Lu, Jiangsu (CN); Yuehui Guan, Jiangsu (CN); Guozhong Li, Jiangsu (CN); Xiaohong Xu, Jiangsu (CN); Yun Bai, Jiangsu (CN); Hao Zong, Jiangsu (CN); Jiafeng He, Jiangsu (CN); De Chen, Jiangsu (CN); Zhen Huang, Jiangsu (CN); and Jia Yang, Jiangsu (CN)
Assigned to JIANGYIN XINGCHENG GOLD MATERIALS CO., LTD, Jiangsu (CN); and JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD, Jiangsu (CN)
Appl. No. 17/607,869
Filed by JIANGYIN XINGCHENG GOLD MATERIALS CO., LTD, Jiangsu (CN); and JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD, Jiangsu (CN)
PCT Filed Nov. 8, 2019, PCT No. PCT/CN2019/116432
§ 371(c)(1), (2) Date Oct. 30, 2021,
PCT Pub. No. WO2020/094106, PCT Pub. Date May 14, 2020.
Claims priority of application No. 201811329247.2 (CN), filed on Nov. 9, 2018.
Prior Publication US 2022/0364199 A1, Nov. 17, 2022
Int. Cl. C21D 11/00 (2006.01); C21D 6/00 (2006.01); C21D 8/06 (2006.01); C21D 9/52 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/50 (2006.01)
CPC C21D 11/005 (2013.01) [C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/065 (2013.01); C21D 9/525 (2013.01); C22C 38/002 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/50 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for controlling carbide network in a bearing steel wire rod by controlling cooling and controlling rolling, characterized in comprising
rolling a bar to a wire with a specified specification and spinning it into a coil, controlling the rolling temperature at 780° C.-880° C.; and controlling the spinning temperature at 750° C.-850° C.;
on-line controlling cooling of continuous coils using EDC water bath austempering cooling process, controlling the cooling rate at 2.0° C./s-10° C./s, and controlling a final cooling temperature within 620-630° C.;
after EDC water bath austempering cooling, slow cooling under a cover, and the temperature is controlled to be 400° C.-500° C. when being removed out of the cover;
after slow cooling, collecting coils, and cooling in air to a room temperature.