发明授权
- 专利标题： Bainite-containing-type high-strength hot-rolled steel sheet having excellent isotropic workability and manufacturing method thereof
- 专利标题（中）： 具有优异各向同性加工性的贝氏体型高强度热轧钢板及其制造方法
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申请号： US13985001申请日： 2012-03-29
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公开(公告)号： US09587287B2公开(公告)日： 2017-03-07
- 发明人: Tatsuo Yokoi , Hiroshi Shuto , Riki Okamoto , Nobuhiro Fujita , Kazuaki Nakano , Takeshi Yamamoto
- 申请人： Tatsuo Yokoi , Hiroshi Shuto , Riki Okamoto , Nobuhiro Fujita , Kazuaki Nakano , Takeshi Yamamoto
- 申请人地址： JP Tokyo
- 专利权人： NIPPON STEEL AND SUMITOMO METAL CORPORATION
- 当前专利权人： NIPPON STEEL AND SUMITOMO METAL CORPORATION
- 当前专利权人地址： JP Tokyo
- 代理机构： Birch, Stewart, Kolasch & Birch, LLP
- 优先权： JP2011-079658 20110331
- 国际申请： PCT/JP2012/058337 WO 20120329
- 国际公布： WO2012/133636 WO 20121004
- 主分类号： C21D8/02
- IPC分类号： C21D8/02 ; C22C38/28 ; C22C38/16 ; C22C38/14 ; C21D9/46 ; C22C38/06 ; C22C38/58 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/08 ; C22C38/12 ; C22C38/38
摘要：
The present invention provides a bainite-containing-type high-strength hot-rolled steel sheet. The steel sheet, containing C: greater than 0.07 to 0.2%, Si: 0.001 to 2.5%, Mn: 0.01 to 4%, P: 0.15% or less, S: 0.03% or less, N: 0.01% or less, Al: 0.001 to 2% and a balance being composed of Fe and impurities, has an average value of pole densities of the {100} to {223} orientation group at a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet is 4.0 or less, and a pole density of the {332} crystal orientation is 4.8 or less, an average crystal grain diameter is 10 μm or less and vTrs is −20° C. or lower, and a microstructure is composed of 35% or less in a structural fraction of pro-eutectoid ferrite and a balance of a low-temperature transformation generating phase.