Invention Grant
- Patent Title: Pearlitic rail and method for manufacturing pearlitic rail
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Application No.: US14779755Application Date: 2014-03-25
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Publication No.: US10253397B2Publication Date: 2019-04-09
- Inventor: Tatsumi Kimura , Kiyoshi Uwai , Shigeru Endo , Moriyasu Yamaguchi
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: RatnerPrestia
- Priority: JP2013-067168 20130327
- International Application: PCT/JP2014/058367 WO 20140325
- International Announcement: WO2014/157252 WO 20141002
- Main IPC: C21D9/04
- IPC: C21D9/04 ; C22C38/28 ; C21D8/00 ; C22C38/00 ; C22C38/18 ; C22C38/50 ; C21D6/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/08 ; C22C38/12 ; C22C38/14 ; C22C38/16 ; C22C38/22 ; C22C38/24 ; C22C38/26

Abstract:
A pearlitic rail includes a composition including in % by mass: 0.70% to 0.90% of C; 0.1% to 1.5% of Si; 0.01% to 1.5% of Mn; 0.001% to 0.035% of P; 0.0005% to 0.030% of S; 0.1% to 2.0% of Cr, remainder of the composition consisting of Fe and inevitable impurities. Surface hardness of a rail top is not less than HB 430, and hardness at a depth of 25 mm from a surface of the rail top is not less than HB 410.
Public/Granted literature
- US20160083820A1 PEARLITIC RAIL AND METHOD FOR MANUFACTURING PEARLITIC RAIL Public/Granted day:2016-03-24
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