Invention Grant
- Patent Title: Rail and method for manufacturing same
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Application No.: US17040979Application Date: 2019-03-28
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Publication No.: US11492689B2Publication Date: 2022-11-08
- Inventor: Keisuke Ando , Tatsumi Kimura , Satoshi Igi
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: JFE STEEL CORPORATION
- Current Assignee: JFE STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Kenja IP Law PC
- Priority: JPJP2018-068791 20180330
- International Application: PCT/JP2019/013864 WO 20190328
- International Announcement: WO2019/189686 WO 20191003
- Main IPC: C22C38/34
- IPC: C22C38/34 ; C21D6/00 ; C21D8/00 ; C21D9/04 ; C22C38/02 ; C22C38/04

Abstract:
The rail having a chemical composition containing C: 0.70-1.00 mass %, Si: 0.50-1.60 mass %, Mn: 0.20-1.00 mass %, P: ≤0.035 mass %, S: ≤0.012 mass %, Cr: 0.40-1.30 mass %, where Ceq defined by the formula (1) is 1.04-1.25, Ceq=[% C]+([% Si]/11)+([% Mn]/7)+([% Cr]/5.8) (1) where [% M] is the content in mass % of the element M, the balance being Fe and inevitable impurities, where Ceq(max) is ≤1.40, where the Ceq(max) is determined by the formula (2) using maximum contents of C, Si, Mn, and Cr obtained by subjecting a region between specified positions to EPMA line analysis; and a pearlite area ratio in the region is 95% or more, Ceq(max)=[% C(max)]+([% Si(max)]/11)+([% Mn(max)]/7)+([% Cr(max)]/5.8) (2) where [% M(max)] is the maximum content of the element M.
Public/Granted literature
- US20210102277A1 RAIL AND METHOD FOR MANUFACTURING SAME Public/Granted day:2021-04-08
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