发明名称 |
HIGH-CARBON HOT ROLLED STEEL SHEET WITH EXCELLENT HARDENABILITY AND SMALL IN-PLANE ANISTROPY AND METHOD FOR MANUFACTURING THE SAME (AS AMENDED) |
摘要 |
A high-carbon hot rolled steel sheet with excellent hardenability and small in-plane anisotropy, and a method for manufacturing the steel sheet are provided. The steel sheet has a chemical composition including, by mass %, C: 0.20 to 0.48%, Si: not more than 0.1%, Mn: not more than 0.5%, P: not more than 0.03%, S: not more than 0.01%, sol. Al: not more than 0.10%, N: not more than 0.005% and B: 0.0005 to 0.0050%, the balance including Fe and inevitable impurities. The steel sheet includes a microstructure containing ferrite and cementite. The cementite has an average grain size of not more than 1.0 μm. The steel sheet has an in-plane anisotropy of r value, Δr, of not more than 0.1 in absolute value. |
申请公布号 |
US2015000801(A1) |
申请公布日期 |
2015.01.01 |
申请号 |
US201214370121 |
申请日期 |
2012.12.25 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
Miyamoto Yuka;Kobayashi Takashi;Nakamura Nobuyuki;Funakawa Yoshimasa |
分类号 |
C21D9/46;C22C38/60;C22C38/32;C22C38/00;C22C38/08;C22C38/06;C22C38/04;C22C38/02;C21D8/02;C22C38/22 |
主分类号 |
C21D9/46 |
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 with excellent hardenability and small in-plane anisotropy, the steel sheet having a chemical composition including, by mass %, C: 0.20 to 0.48%, Si: not more than 0.1%, Mn: not more than 0.5%, P: not more than 0.03%, S: not more than 0.01%, sol. Al: not more than 0.10%, N: not more than 0.005% and B: 0.0005 to 0.0050%, the balance comprising Fe and inevitable impurities, the steel sheet comprising a microstructure including ferrite and cementite, the cementite having an average grain size of not more than 1.0 μm, the steel sheet having an in-plane anisotropy of r value, Δr, of not more than 0.1 in absolute value. |
地址 |
Chiyoda-ku, Tokyo JP |