发明名称 |
HIGH CARBON HOT ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME (AS AMENDED) |
摘要 |
A high carbon hot rolled steel sheet having a chemical composition containing by mass %, C: 0.20% to 0.48%, Si: 0.1% or less, Mn: 0.5% or less, P: 0.03% or less, S: 0.01% or less, Al: 0.1% to 0.6%, Cr: 0.05% to 0.5%, B: 0.0005% to 0.0050%, Ca: 0.0010% to 0.0050%, and the remainder composed of Fe and incidental impurities, on a percent by mass basis, where the average amount of N in a surface layer portion from the surface to the position at a depth of 0.1 mm in thickness direction is 0.1% or more and the average amount of N in the central portion in thickness is 0.01% or less, and a microstructure composed of ferrite and carbides, wherein the average grain size of the ferrite is 10 to 20 and the spheroidization ratio of the carbides is 90% or more. |
申请公布号 |
US2014332122(A1) |
申请公布日期 |
2014.11.13 |
申请号 |
US201214370319 |
申请日期 |
2012.12.26 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
Nakamura Nobuyuki;Kobayashi Takashi;Funakawa Yoshimasa |
分类号 |
C22C38/54;C22C38/32;C22C38/28;C22C38/24;C22C38/00;C22C38/20;C22C38/04;C22C38/06;C22C38/02;C21D8/02;C22C38/22 |
主分类号 |
C22C38/54 |
代理机构 |
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代理人 |
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主权项 |
1. A high carbon hot rolled steel sheet comprising a chemical composition containing by mass %, C: 0.20% to 0.48%, Si: 0.1% or less, Mn: 0.5% or less, P: 0.03% or less, S: 0.01% or less, Al: 0.1% to 0.6%, Cr: 0.05% to 0.5%, B: 0.0005% to 0.0050%, Ca: 0.0010% to 0.0050%, and the remainder composed of Fe and incidental impurities, on a percent by mass basis, where the average amount of N in a surface layer portion from the surface to the position at a depth of 0.1 mm in thickness direction is 0.1% or more and the average amount of N in the central portion in thickness is 0.01% or less, and a microstructure composed of ferrite and carbides, wherein the average grain size of the ferrite is 10 to 20 μm and the spheroidization ratio of the carbides is 90% or more. |
地址 |
Chiyoda-ku, Tokyo JP |