Invention Grant
- Patent Title: Steel for cold forging/nitriding, steel material for cold forging/nitriding, and cold-forged/nitrided component
- Patent Title (中): 冷锻/氮化钢，冷锻/氮化钢材，冷锻/氮化组件
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Application No.: US14389776Application Date: 2013-02-28
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Publication No.: US09574256B2Publication Date: 2017-02-21
- Inventor: Hideki Imataka , Masayuki Horimoto , Yuya Gyotoku , Kosuke Tanaka
- Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Clark & Brody
- Priority: JP2012-083609 20120402
- International Application: PCT/JP2013/055296 WO 20130228
- International Announcement: WO2013/150844 WO 20131010
- Main IPC: C22C38/02
- IPC: C22C38/02 ; C22C38/60 ; C23C8/02 ; C23C8/26 ; C21D9/00 ; C22C38/00 ; C22C38/06 ; C22C38/20 ; C22C38/24 ; C22C38/38 ; C22C38/46 ; C22C38/58 ; C22C38/22 ; C22C38/26 ; C22C38/28 ; C22C38/42 ; C22C38/50 ; C23C8/50 ; C21D7/02
Abstract:
A steel comprises, by mass percent, C: 0.10 to 0.15%, Si: not less than 0.02% and less than 0.10%, Mn: more than 0.90% and not more than 2.50%, P≦0.030%, S≦0.050%, Cr: 0.80 to 2.0%, V: 0.05 to 0.50%, Al: 0.01 to 0.07%, N≦0.0080%, O≦0.0030%, and one or more selected from Mo, Cu, Ni, Ti, Nb, Zr, Pb, Ca, Bi, Te, Se and Sb, the balance being Fe and impurities. The composition satisfies [35≦Mn/S≦200], [20≦(669.3×loge C−1959.6×loge N−6983.3)×(0.067×Mo+0.147×V)≦80], [140×Cr+125×Al+235×V≧160] and [150≦511×C+33×Mn+56×Cu+15×Ni+36×Cr+5×Mo+134×V≦200].
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