- 专利标题: CASE HARDENING STEEL, METHOD OF PRODUCING CASE HARDENING STEEL, AND METHOD OF PRODUCING GEAR PART
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申请号: US16305519申请日: 2017-05-31
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公开(公告)号: US20190352762A1公开(公告)日: 2019-11-21
- 发明人: Keisuke ANDO , Takashi IWAMOTO , Kunikazu TOMITA , Kazukuni HASE , Kimihiro NISHIMURA
- 申请人: JFE STEEL CORPORATION
- 申请人地址: JP Chiyoda-ku Tokyo JP Chiyoda-ku Tokyo
- 专利权人: JFE STEEL CORPORATION,JFE STEEL CORPORATION
- 当前专利权人: JFE STEEL CORPORATION,JFE STEEL CORPORATION
- 当前专利权人地址: JP Chiyoda-ku Tokyo JP Chiyoda-ku Tokyo
- 优先权: JP2016-109532 20160531; JP2016-176921 20160909
- 国际申请: PCT/JP2017/020258 WO 20170531
- 主分类号: C23C8/22
- IPC分类号: C23C8/22 ; C21D9/32 ; C21D1/06 ; C21D8/06 ; C21D9/52 ; C22C38/28 ; C22C38/26 ; C22C38/22 ; C22C38/04 ; C22C38/02 ; C22C38/00 ; C22C38/06 ; C23C8/02 ; C23C8/80 ; F16H55/06
摘要:
A case hardening steel suitable as raw material for producing a mechanical structural part having high rotating bending fatigue strength and pitting fatigue strength at relatively low cost and a method of producing the case hardening steel are provided. A case hardening steel comprises a chemical composition containing, in mass %, C, Si, Mn, P, S, Cr, Mo, Al, N, and O in a predetermined relationship, with a balance being Fe and inevitable impurities, wherein √I≤80 (where I denotes an area (μm2) of an oxide-based inclusion located in a fish eye central portion at a fracture surface after subjecting the case hardening steel to carburizing-quenching and tempering and then performing a rotating bending fatigue test).