公开(公告)号：EP3919646A1

公开(公告)日：2021-12-08

申请号：EP21152891.4

申请日：2021-01-22

申请人： Central Iron & Steel Research Institute

发明人： CAO, Wenquan ,  WENG, Yuqing ,  XU, Haifeng ,  WANG, Cunyu ,  YU, Feng ,  WANG, Hui ,  SHI, Zhiyue ,  XU, Da

IPC分类号： C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/02 ,  C22C38/04 ,  C21D1/18 ,  C21D1/32 ,  C21D1/58 ,  C21D6/02 ,  C21D6/00 ,  C21D8/00 ,  F16C33/00

摘要： The present disclosure relates to the technical field of microstructure refinement and homogenization of bearing steel, and specifically relates to a high-carbon bearing steel and a preparation method thereof. The high-carbon bearing steel of the present disclosure has the following chemical composition: C: 0.80∼1.20 wt%, Cr: 0.40∼2.0 wt%, Mn: 0.15∼0.75 wt%, Si: 0.15-0.75 wt%, Nb: 0-0.20 wt%, Mo: 0-0.20 wt%, V: 0-0.20 wt%, P ≤ 0.015 wt%, S ≤ 0.01 wt%, the remaining is Fe and unavoidable impurities; the contents of Nb, Mo and V are not 0 at the same time. In the present disclosure, microalloying elements such as Nb, Mo and V, in combination with other elements, are added into the high-carbon bearing steel to effectively refine the matrix of bearing steel and promote the precipitation of a large amount of nano-carbides, thereby enhancing the contact fatigue life of the high-carbon bearing steel.

公开(公告)号：EP3940089A1

公开(公告)日：2022-01-19

申请号：EP21153214.8

申请日：2021-01-25

申请人： Central Iron & Steel Research Institute

发明人： CAO, Wenquan ,  YU, Feng ,  WANG, Cunyu ,  XU, Haifeng ,  WANG, Hui ,  XU, Da ,  WENG, Yuqing

IPC分类号： C21D1/02 ,  C21D1/06 ,  C21D1/58 ,  C21D6/00 ,  C21D8/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C23C8/22 ,  F16C33/00

摘要： The present disclosure relates to the technical field of microstructure refinement and homogenization of bearing steel, and specifically relates to a carburizing bearing steel and a preparation method thereof. The carburizing bearing steel of the present disclosure comprises: 0.18-0.24 wt% of C, 0.4-0.6 wt% of Cr, 0.20-0.40 wt% of Si, 0.40-0.70 wt% of Mn, 1.6-2.2 wt% of Ni, 0.15-0.35 wt% of Mo, 0.001-0.01 wt% of S, 0.001-0.015 wt% of P, 0∼0.20 wt% of Nb, 0∼0.20 wt% of V and the remaining iron; the contents of Nb and V are not 0 at the same time. In the present disclosure, an appropriate amount of Nb and V are added in combination with other elements so as to refine the grain size, inhibit the generation of large granular carbides in the steel during carburization and improve the uniformity of the microstructure of steel materials, thus further enhancing the contact fatigue life of the carburizing bearing steel.