- 专利标题： High toughness and high tensile strength thick steel plate with excellent material homogeneity and production method for same
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申请号： US15525672申请日： 2015-11-17
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公开(公告)号： US10351926B2公开(公告)日： 2019-07-16
- 发明人: Yota Kuronuma , Hirofumi Ohtsubo , Shigeki Kitsuya , Katsuyuki Ichimiya , Kazukuni Hase
- 申请人： JFE STEEL CORPORATION
- 申请人地址： JP Chiyoda-ku, Tokyo
- 专利权人： JFE STEEL CORPORATION
- 当前专利权人： JFE STEEL CORPORATION
- 当前专利权人地址： JP Chiyoda-ku, Tokyo
- 代理机构： Kenja IP Law PC
- 优先权： JP2014-233754 20141118
- 国际申请： PCT/JP2015/005726 WO 20151117
- 国际公布： WO2016/079978 WO 20160526
- 主分类号： C21D9/46
- IPC分类号： C21D9/46 ; B21J1/02 ; C22C38/00 ; C22C38/58 ; C21D6/00 ; C21D7/13 ; C21D8/00 ; C21D8/02 ; C21D9/00 ; C21D1/18 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/08 ; C22C38/12 ; C22C38/14 ; C22C38/20 ; C22C38/22 ; C22C38/24 ; C22C38/26 ; C22C38/28 ; C22C38/32 ; C22C38/42 ; C22C38/44 ; C22C38/46 ; C22C38/48 ; C22C38/50 ; C22C38/54 ; B21J5/02
摘要：
A thick steel plate is provided by heating a continuously-cast slab, hot forging the continuously-cast slab using opposing dies having respective short sides differing such that when a short side length of a die having a shorter one of the short sides is taken to be 1, a short side length of a die having a longer one of the short sides is 1.1 to 3.0, allowing cooling to obtain a steel raw material, reheating the steel raw material, performing hot rolling of the steel raw material including at least two passes carried out, allowing cooling to obtain a thick steel plate, reheating the thick steel plate to at least the Ac3 temperature and no higher than 1050° C., rapidly cooling the thick steel plate to 350° C. or lower, and tempering the thick steel plate at at least 550° C. and no higher than 700° C.
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