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公开(公告)号：US10087499B2
公开(公告)日：2018-10-02
申请号：US14370158
申请日：2012-12-27
发明人： Hiroshi Shuto , Tatsuo Yokoi , Yuuki Kanzawa , Nobuhiro Fujita , Ryohta Niiya , Shinya Saitoh
IPC分类号： C21D8/02 , C22C38/06 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/12 , C22C38/14 , B32B15/01 , C22C38/08 , C22C38/20 , C22C38/26 , C22C38/28 , C21D9/46 , C21D1/25 , C23C2/02 , C25D5/36
摘要： There are provided a high-strength hot-rolled steel sheet securing low-temperature toughness and having excellent stretch flangeability by controlling a structural fraction and a hardness difference among structures, and a manufacturing method thereof. A hot-rolled steel sheet contains: C: 0.01 to 0.2%; Si: 0.001 to 2.5% or less; Mn: 0.10 to 4.0% or less; P: 0.10% or less; S: less than 0.03%; Al: 0.001 to 2.0%; N: less than 0.01%; Ti: (0.005+48/14[N]+48/32[S]) % or more and 0.3% or less; Nb: 0 to 0.06%; Cu: 0 to 1.2%; Ni: 0 to 0.6%; Mo: 0 to 1%; V: 0 to 0.2%; Cr: 0 to 2%; Mg: 0 to 0.01%; Ca: 0 to 0.01%; REM: 0 to 0.1%; and B: 0 to 0.002%, and has: an texture in which, at a central portion of a sheet thickness located between ⅜ to ⅝ thickness positions of the sheet thickness from a surface of the steel sheet, an average value of X-ray random intensity ratios of a group of {100} to {223} orientations of a sheet plane is 6.5 or less and an X-ray random intensity ratio of a {332} crystal orientation is 5.0 or less; and a microstructure in which a total area ratio of tempered martensite, martensite and lower bainite is more than 85%, and an average crystal grain diameter is 12.0 μm or less.
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公开(公告)号：US20150017471A1
公开(公告)日：2015-01-15
申请号：US14370158
申请日：2012-12-27
发明人： Hiroshi Shuto , Tatsuo Yokoi , Yuuki Kanzawa , Nobuhiro Fujita , Ryohta Niiya , Shinya Saitoh
IPC分类号： C21D8/02 , C22C38/26 , C22C38/20 , C22C38/14 , B32B15/01 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/28 , C22C38/12
CPC分类号： C21D8/0263 , B32B15/01 , C21D1/25 , C21D8/0226 , C21D9/46 , C21D2201/05 , C21D2211/002 , C21D2211/008 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/20 , C22C38/26 , C22C38/28 , C23C2/02 , C25D5/36 , Y10T428/12799
摘要： There are provided a high-strength hot-rolled steel sheet securing low-temperature toughness and having excellent stretch flangeability by controlling a structural fraction and a hardness difference among structures, and a manufacturing method thereof. A hot-rolled steel sheet contains: C: 0.01 to 0.2%; Si: 0.001 to 2.5% or less; Mn: 0.10 to 4.0% or less; P: 0.10% or less; S: less than 0.03%; Al: 0.001 to 2.0%; N: less than 0.01%; Ti: (0.005+48/14[N]+48/32[S]) % or more and 0.3% or less; Nb: 0 to 0.06%; Cu: 0 to 1.2%; Ni: 0 to 0.6%; Mo: 0 to 1%; V: 0 to 0.2%; Cr: 0 to 2%; Mg: 0 to 0.01%; Ca: 0 to 0.01%; REM: 0 to 0.1%; and B: 0 to 0.002%, and has: an texture in which, at a central portion of a sheet thickness located between ⅜ to ⅝ thickness positions of the sheet thickness from a surface of the steel sheet, an average value of X-ray random intensity ratios of a group of {100} to {223} orientations of a sheet plane is 6.5 or less and an X-ray random intensity ratio of a {332} crystal orientation is 5.0 or less; and a microstructure in which a total area ratio of tempered martensite, martensite and lower bainite is more than 85%, and an average crystal grain diameter is 12.0 m or less.
摘要翻译： 提供一种通过控制结构之间的结构分数和硬度差来确定低温韧性并具有优异的拉伸凸缘性的高强度热轧钢板及其制造方法。 热轧钢板含有：C：0.01〜0.2％ Si：0.001〜2.5％以下; Mn：0.10〜4.0％以下; P：0.10％以下; S：小于0.03％; Al：0.001〜2.0％ N：小于0.01％; Ti：（0.005 + 48/14 [N] +48 / 32 [S]）％以上且0.3％以下; Nb：0〜0.06％ Cu：0〜1.2％ Ni：0〜0.6％; Mo：0〜1％ V：0〜0.2％; Cr：0〜2％ Mg：0〜0.01％ Ca：0〜0.01％ REM：0〜0.1％ B：0〜0.002％，其特征在于，在从钢板表面的片材厚度位于⅜厚度位置之间的片材厚度的中央部，X线的平均值 片材平面的{100} <011>至{223} <110>取向组的随机强度比为6.5以下，{332} <113>晶体取向的X射线随机强度比为5.0或 减; 回火马氏体，马氏体和下贝氏体的总面积比大于85％，平均结晶粒径为12.0μm以下的组织。
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公开(公告)号：US10513749B2
公开(公告)日：2019-12-24
申请号：US15313484
申请日：2014-05-28
发明人： Takeshi Toyoda , Riki Okamoto , Ryohta Niiya , Hiroshi Sakai , Hidetoshi Shindo
IPC分类号： C21D9/46 , C21D1/60 , C21D1/613 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/28 , C22C38/38 , B22D11/00
摘要： A hot-rolled steel sheet has predetermined chemical composition, a sum of a Si content and an Al content is higher than 0.20% and lower than 0.81%, a microstructure includes, by area fraction, 90% to 99% of a ferrite, 1% to 10% of a martensite, and a bainite limited to 5% or less, the grain size of the martensite is 1 to 10 μm, the X-ray random intensity ratio of a {211} orientation which is parallel to a rolled surface of the steel sheet and is parallel to a rolling direction is 3.0 or less.
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