- 专利标题: METHOD OF MANUFACTURING A STEEL RAIL
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申请号: EP19192685.6申请日: 2011-06-07
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公开(公告)号: EP3604600A1公开(公告)日: 2020-02-05
- 发明人: UEDA, Masaharu , TAKAHASHI, Jun , KOBAYASHI, Akira , TANAHASHI, Takuya
- 申请人: NIPPON STEEL CORPORATION
- 申请人地址: 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo JP
- 专利权人: NIPPON STEEL CORPORATION
- 当前专利权人: NIPPON STEEL CORPORATION
- 当前专利权人地址: 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo JP
- 代理机构: Vossius & Partner Patentanwälte Rechtsanwälte mbB
- 优先权: JP2010130164 20100607
- 主分类号: C22C38/00
- IPC分类号: C22C38/00 ; B21B3/00 ; C21D8/00 ; C21D9/04 ; C22C38/34 ; C22C38/54 ; B21B1/085 ; C22C38/02 ; C22C38/04 ; C22C38/18 ; C22C38/22 ; C22C38/24 ; C22C38/26 ; C22C38/28 ; C22C38/32 ; C22C38/40
摘要:
A steel rail includes: by mass%, higher than 0.85% to 1.20% of C; 0.05% to 2.00% of Si; 0.05% to 0.50% of Mn; 0.05% to 0.60% of Cr; P≤0.0150%; and the balance consisting of Fe and inevitable impurities, wherein 97% or more of a head surface portion which is in a range from a surface of a head corner portion and a head top portion as a starting point to a depth of 10 mm has a pearlite structure, a Vickers hardness of the pearlite structure is Hv320 to 500, and a CMn/FMn value which is a value obtained by dividing CMn [at.%] that is a Mn concentration of a cementite phase in the pearlite structure by FMn [at.%] that is a Mn concentration of a ferrite phase is equal to or higher than 1.0 and equal to or less than 5.0.
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