Invention Grant
- Patent Title: Case hardening steel and manufacturing method thereof
- Patent Title (中): 表面硬化钢及其制造方法
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Application No.: US13696714Application Date: 2011-10-05
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Publication No.: US08673094B2Publication Date: 2014-03-18
- Inventor: Masayuki Hashimura , Kei Miyanishi , Shuji Kozawa , Manabu Kubota , Tatsuro Ochi
- Applicant: Masayuki Hashimura , Kei Miyanishi , Shuji Kozawa , Manabu Kubota , Tatsuro Ochi
- Applicant Address: JP Tokyo
- Assignee: Nippon Steel & Sumitomo Metal Corporation
- Current Assignee: Nippon Steel & Sumitomo Metal Corporation
- Current Assignee Address: JP Tokyo
- Agency: Kenyon & Kenyon LLP
- Priority: JP2010-226478 20101006
- International Application: PCT/JP2011/072999 WO 20111005
- International Announcement: WO2012/046779 WO 20120412
- Main IPC: C22C38/28
- IPC: C22C38/28
Abstract:
A case hardening steel includes by mass %, C: 0.1% to 0.5%, Si: 0.01% to 1.5%, Mn: 0.3% to 1.8%, S: 0.001% to 0.15%, Cr: 0.4% to 2.0%, Ti: 0.05% to 0.2%, Al: limited to 0.2% or less, N: limited to 0.0050% or less, P: limited to 0.025% or less, O: limited to 0.0025% or less, and the balance of Fe and inevitable impurities, wherein the number d of sulfide having an equivalent circle diameter more than 5 μm per 1 mm2 and a mass percentage [S] of S satisfy: d≦500×[S]+1.
Public/Granted literature
- US20130048156A1 CASE HARDENING STEEL AND MANUFACTURING METHOD THEREOF Public/Granted day:2013-02-28
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