Invention Grant
- Patent Title: Surface layer-hardened steel part and method of manufacturing the same
- Patent Title (中): 表面硬化钢部件及其制造方法
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Application No.: US13258340Application Date: 2011-02-18
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Publication No.: US08475605B2Publication Date: 2013-07-02
- Inventor: Manabu Kubota , Tatsuro Ochi
- Applicant: 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: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JPP2010-064880 20100319
- International Application: PCT/JP2011/053517 WO 20110218
- International Announcement: WO2011/114836 WO 20110922
- Main IPC: C23C8/32
- IPC: C23C8/32 ; C23C8/22 ; C22C38/60 ; C22C38/08 ; C22C38/18 ; C22C38/22 ; C22C38/16 ; C22C38/06
Abstract:
In the steel for a surface layer hardening which is treated with carburizing in a temperature range of 800° C. to 900° C., chemical composition thereof contains, by mass %, C: 0.10% to 0.60%, Si: 0.01% to 2.50%, Mn: 0.20% to 2.00%, S: 0.0001% to 0.10%, Cr: 2.00% to 5.00%, Al: 0.001% to 0.50%, N: 0.0020% to 0.020%, P: 0.001% to 0.050%, and O: 0.0001% to 0.0030%; the remaining portion thereof includes Fe and unavoidable impurities; and the total amount of Cr, Si, and Mn satisfies, by mass %, 2.0≦Cr+Si+Mn≦8.0.
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