Invention Grant
- Patent Title: Internal high hardness type pearlitic rail with excellent wear resistance and rolling contact fatigue resistance and method for producing same
- Patent Title (中): 内部高硬度型珠光体钢轨，具有优异的耐磨性和滚动接触疲劳性及其制造方法
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Application No.: US12593463Application Date: 2008-03-25
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Publication No.: US07955445B2Publication Date: 2011-06-07
- Inventor: Minoru Honjo , Tatsumi Kimura , Shinichi Suzuki , Kimihiro Nishimura , Shinji Mitao , Nobuo Shikanai
- Applicant: Minoru Honjo , Tatsumi Kimura , Shinichi Suzuki , Kimihiro Nishimura , Shinji Mitao , Nobuo Shikanai
- Applicant Address: JP
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP
- Agency: DLA Piper LLP (US)
- Priority: JP2007-084400 20070328; JP2007-264824 20071010
- International Application: PCT/JP2008/056277 WO 20080325
- International Announcement: WO2008/123483 WO 20081016
- Main IPC: C21D8/00
- IPC: C21D8/00 ; C21D9/04 ; C22C38/18 ; C22C38/24 ; C22C38/40
Abstract:
An internal high hardness type pearlitic rail that has a composition containing 0.73% to 0.85% by mass C, 0.5% to 0.75% by mass Si, 0.3% to 1.0% by mass Mn, 0.035% by mass or less P, 0.0005% to 0.012% by mass S, 0.2% to 1.3% by mass Cr, and the balance being Fe and incidental impurities, in which the value of [% Mn]/[% Cr] is greater than or equal to 0.3 and less than 1.0, where [% Mn] represents the Mn content, and [% Cr] represents the Cr content, and in which the internal hardness of a rail head that is defined by the Vickers hardness of a portion located from a surface layer of the rail head to a depth of at least 25 mm is greater than or equal to 380 Hv and less than 480 Hv.
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