Invention Grant
- Patent Title: Rail
- Patent Title (中): 轨
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Application No.: US14382693Application Date: 2013-04-23
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Publication No.: US09127409B2Publication Date: 2015-09-08
- Inventor: Masaharu Ueda , Teruhisa Miyazaki , Takeshi Yamamoto , Takashi Morohoshi
- 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: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2012-097584 20120423
- International Application: PCT/JP2013/061857 WO 20130423
- International Announcement: WO2013/161794 WO 20131031
- Main IPC: E01B5/02
- IPC: E01B5/02 ; C21D9/04 ; C21C7/06 ; C22C38/06 ; C22C38/58 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/12 ; C22C38/18 ; C22C38/22

Abstract:
In the rail, 95% or more of a structure in a head surface section, which is a range from surfaces of head corner sections and a head top section of the rail as a starting point to a depth of 20 mm, is a pearlite or bainite structure and the structure contains 20 to 200 MnS-based sulfides formed around an Al-based oxide as a nucleus and having a grain size in a range of 1 μm to 10 μm per square millimeter of an area to be inspected on a horizontal cross section of the rail.
Public/Granted literature
- US20150069141A1 RAIL Public/Granted day:2015-03-12
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