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公开(公告)号：US10384251B2
公开(公告)日：2019-08-20
申请号：US15555656
申请日：2016-03-09
发明人： Eiji Isogai , Yutaka Mikazuki , Riki Okamoto
摘要： In performing burring processing on a sheet-like member, the following processes are performed: a punching process of performing punching processing of the sheet-like member; a hole expansion process of performing hole expansion processing of a punched hole formed by the punching process; a re-punching process of performing punching processing again on a portion surrounding the punched hole expanded by force in the hole expansion process; and a burring process of pushing a portion surrounding a re-punched hole that is a punched hole formed by the re-punching process and forming a vertical wall.
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公开(公告)号：US10364478B2
公开(公告)日：2019-07-30
申请号：US15411372
申请日：2017-01-20
发明人： Tatsuo Yokoi , Hiroshi Shuto , Riki Okamoto , Nobuhiro Fujita , Kazuaki Nakano , Takeshi Yamamoto
IPC分类号： C21D9/46 , C21D8/02 , C22C38/06 , C22C38/58 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/28 , C22C38/38 , C22C38/18 , C21D6/00
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.
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公开(公告)号：US10435772B2
公开(公告)日：2019-10-08
申请号：US15546410
申请日：2016-03-28
发明人： Yoshinari Ishida , Riki Okamoto , Daisuke Maeda
IPC分类号： C22C38/28 , B21B3/02 , B21C37/02 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/58 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/42 , C22C38/50 , C22C38/38
摘要： A steel sheet includes: a base iron; a scale of 10.0 μm or less in thickness on a surface of the base iron; a subscale between the base iron and the scale. In the subscale, an average value of Cr concentrations is 1.50 mass % to 5.00 mass %, and one part or more exist(s) where a ratio of Cr concentrations between two adjacent measurement regions separate by 1 μm is 0.90 or less or 1.11 or more in a range of 50 μm in length in a rolling direction. A percentage of an amount of Ti contained in carbide or carbonitride of 100 nm or more and 1 μm or less in grain diameter to a parameter Tieff represented by a formula “Tieff=[Ti]−48/14[N]” is 30% or less in which [Ti] denotes a Ti content (mass %) and [N] denotes a N content (mass %).
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公开(公告)号：US10294551B2
公开(公告)日：2019-05-21
申请号：US14782764
申请日：2014-04-28
IPC分类号： C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/28 , C22C38/54 , C21D8/04 , C21D9/46
摘要： A steel sheet including, by mass %, C: more than 0.100% and 0.500% or less, Si: 0.0001% or more and less than 0.20%, Mn: more than 0.20% and 0.50% or less, Al: 3.0% or more and 10.0% or less, N: 0.0030% or more and 0.0100% or less, Ti: more than 0.100% and 1.000% or less, P: 0.00001% or more and 0.0200% or less, S: 0.00001% or more and 0.0100% or less, and a remainder including Fe and impurities, in which a sum of a C content and a Ti content satisfies 0.200
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公开(公告)号：US10266928B2
公开(公告)日：2019-04-23
申请号：US15398446
申请日：2017-01-04
发明人： Yuri Toda , Riki Okamoto , Nobuhiro Fujita , Kohichi Sano , Hiroshi Yoshida , Toshio Ogawa , Kunio Hayashi , Kazuaki Nakano
IPC分类号： C21D9/46 , C21D8/02 , C22C38/38 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/60 , C22C38/22 , C22C38/28 , C22C38/32 , C21D8/00
摘要： A cold-rolled steel sheet satisfies that an average pole density of an orientation group of {100} to {223} is 1.0 to 5.0, a pole density of a crystal orientation {332} is 1.0 to 4.0, a Lankford-value rC in a direction perpendicular to a rolling direction is 0.70 to 1.50, and a Lankford-value r30 in a direction making an angle of 30° with the rolling direction is 0.70 to 1.50. Moreover, the cold-rolled steel sheet includes, as a metallographic structure, by area %, a ferrite and a bainite of 30% to 99% in total and a martensite of 1% to 70%.
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6.发明授权公开(公告)号：US10066283B2
公开(公告)日：2018-09-04
申请号：US15249595
申请日：2016-08-29
发明人： Yuri Toda , Riki Okamoto , Nobuhiro Fujita , Kohichi Sano , Hiroshi Yoshida , Toshio Ogawa
IPC分类号： C22C38/02 , C22C38/04 , C22C38/06 , C23C2/06 , C23C2/02 , C23C2/28 , C22C38/00 , C22C38/12 , C22C38/14 , C21D8/02 , C22C38/08 , C22C38/16 , C22C38/22 , C22C38/28 , C22C38/32 , C22C38/38 , C21D9/46 , C23C2/40
摘要： This high-strength cold-rolled steel sheet having excellent uniform elongation and hole expandability contains, C: 0.01 to 0.4%; Si: 0.001 to 2.5%; Mn: 0.001 to 4.0%; P: 0.001 to 0.15%; S: 0.0005 to 0.03%; Al: 0.001 to 2.0%; N: 0.0005 to 0.01%; and O: 0.0005 to 0.01%; in which Si+Al is limited to less than 1.0%, and a balance being composed of iron and inevitable impurities, in which at a sheet thickness center portion, an average value of pole densities of the {100} to {223} orientation group is 5.0 or less, and a pole density of the {332} crystal orientation is 4.0 or less, a metal structure contains 5 to 80% of ferrite, 5 to 80% of bainite, and 1% or less of martensite in terms of an area ratio and the total of martensite, pearlite, and retained austenite is 5% or less, and an r value (rC) in a direction perpendicular to a rolling direction is 0.70 or more and an r value (r30) in a direction 30° from the rolling direction is 1.10 or less.
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公开(公告)号：US10060006B2
公开(公告)日：2018-08-28
申请号：US15133848
申请日：2016-04-20
发明人： Yoshihiro Suwa , Kazuaki Nakano , Kunio Hayashi , Riki Okamoto , Nobuhiro Fujita , Kohichi Sano
IPC分类号： C22C38/02 , C22C38/04 , C22C38/06 , C21D9/46 , C21D8/02 , C22C38/00 , C22C38/12 , C22C38/14 , C21D8/04 , B32B15/01 , C22C38/08 , C22C38/10 , C22C38/16 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/22 , C23C2/06 , C23C2/28 , C23C2/36
CPC分类号： C21D9/46 , B32B15/013 , C21D8/02 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0426 , C21D8/0436 , C21D8/0473 , C21D2201/05 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C21D2211/009 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/105 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/38 , C23C2/06 , C23C2/285 , C23C2/36 , Y10T428/12799
摘要： This high-strength cold-rolled steel sheet contains, in mass %, C: 0.02% to 0.20%; Si: 0.001% to 2.5%; Mn: 0.01% to 4.0%; P: 0.001% to 0.15%; S: 0.0005% to 0.03%; Al: 0.001% to 2.0%; N: 0.0005% to 0.01%; and O: 0.0005% to 0.01%; in which Si+Al is limited to less than 1.0%, and a balance being composed of iron and inevitable impurities, in which an area ratio of bainite in a metal structure is 95% or more, at a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet, an average value of pole densities of the {100} to {223} orientation group is 4.0 or less, and a pole density of the {332} crystal orientation is 5.0 or less, and a mean volume diameter of crystal grains in the metal structure is 7 μm or less.
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8.发明授权公开(公告)号：US09970074B2
公开(公告)日：2018-05-15
申请号：US14891889
申请日：2014-07-01
发明人： Kaoru Kawasaki , Masaharu Kameda , Kohichi Sano , Riki Okamoto
IPC分类号： C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C21D8/04 , C21D9/46 , C23C2/06 , C23C2/28 , C23C2/40 , C22C38/54 , C22C38/12 , C21D8/02 , B32B15/01 , C21D6/00 , C22C38/00 , C22C38/08 , C22C38/10 , C22C38/14 , C22C38/16 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/42 , C22C38/44
CPC分类号： C21D9/46 , B32B15/013 , C21D6/004 , C21D6/005 , C21D6/007 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0247 , C21D8/0426 , C21D8/0436 , C21D8/0447 , C21D8/0473 , C21D2201/05 , C21D2211/001 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/42 , C22C38/44 , C22C38/54 , C23C2/06 , C23C2/28 , C23C2/40
摘要： A cold-rolled steel sheet includes a predetermined chemical composition, and includes a structure expressed by: an area fraction of ferrite: 95% or more; an area fraction of retained austenite and an area fraction of martensite: 1% to 3% in total; a product of the area fraction of retained austenite and a carbon concentration in retained austenite: 1 or more; a value of I(111)/{I(100)+I(110)} at a region where a depth from a surface is ¼ of a thickness of the cold-rolled steel sheet when intensity of a (hkl) plane is expressed by I(hkl): 2 or less.
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公开(公告)号：US10745775B2
公开(公告)日：2020-08-18
申请号：US15580002
申请日：2016-06-10
发明人： Kohichi Sano , Jun Haga , Koutarou Hayashi , Hiroyuki Kawata , Riki Okamoto , Akihiro Uenishi
IPC分类号： C21D8/02 , C21D9/46 , C21D6/00 , C22C38/58 , C22C38/50 , C22C38/42 , C22C38/32 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/06 , C22C38/02 , C22C38/00 , C23C2/28 , C22C18/00 , C22C38/60 , C23C2/02 , C22C38/04 , C23C2/40 , C23C2/06 , C22C38/10 , C22C38/12 , C22C38/14 , C22C38/40 , C22C38/46 , C22C38/20 , C22C38/08 , C22C38/28 , C22C38/30 , C22C38/52 , C22C38/48 , C22C38/44 , C22C38/18 , C22C38/16 , C22C38/54 , B32B15/01 , B32B15/04 , B32B15/00 , B32B15/18 , C23C2/04 , C23C30/00 , C23C2/26
摘要： A steel sheet for galvannealed steel contains, by mass %, C: 0.25 to 0.70%, Si: 0.25 to 2.50%, Mn: 1.00 to 5.00%, Al: 0.005 to 3.50%, P: 0.15% or less, S: 0.03% or less, N £ 0.02%, O £ 0.01%, and optionally one or more selected from Ti, Nb, V, Cr, Mo, Cu, Ni, B, Ca, REM, Mg, W, Zr, Sb, Sn, As, Te, Y, Hf and Co, a balance being Fe and impurities. The microstructure consists of, by vol. %, retained g: 10.0 to 60.0%, high-temperature tempered martensite3 5.0%, low-temperature tempered martensite3 5.0%, fresh martensite £ 10.0%, a: 0 to 15.0%, P: 0 to 10.0%, a balance being bainite. Total volume ratio of tempered martensite and bainite is 30.0% or more, tensile strength is 1470 MPa or more, tensile strength×uniform elongation is 13000 MPa % or more, and tensile strength×local elongation is 5000 MPa % or more.
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公开(公告)号：US09797024B2
公开(公告)日：2017-10-24
申请号：US15239497
申请日：2016-08-17
发明人： Tatsuo Yokoi , Hiroshi Shuto , Riki Okamoto , Nobuhiro Fujita , Kazuaki Nakano , Takeshi Yamamoto
IPC分类号： C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/14 , C21D8/02 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/32 , C22C38/34 , C22C38/38 , C22C38/36 , C22C38/10 , C22C38/28
CPC分类号： C21D9/46 , C21D8/0226 , C21D8/0263 , C21D2211/005 , C21D2211/009 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/105 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/34 , C22C38/36 , C22C38/38
摘要： In a hot-rolled steel sheet, an average pole density of an orientation group of {100} to {223} , which is represented by an arithmetic average of pole density of each orientation of {100} , {116} , {114} , {112} , and {223} in a center portion of a sheet thickness which is a range of the sheet thickness of ⅝ to ⅜ from a surface of the steel sheet, is 1.0 or more and 4.0 or less, the pole density of a crystal orientation of {332} is 1.0 or more and 4.8 or less, an average grain size in a center in the sheet thickness is 10 μm or less, and a microstructure includes, by a structural fraction, pearlite more than 6% and ferrite in the balance.
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