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公开(公告)号：US12091722B2
公开(公告)日：2024-09-17
申请号：US17421309
申请日：2020-01-08
发明人： Nobusato Morishige , Ryutaro Yamagata , Ichiro Tanaka , Takashi Kataoka , Haruhiko Atsumi , Yoshihiro Suwa , Kazumi Mizukami
IPC分类号： C22C38/00 , C21D6/00 , C21D8/00 , C21D8/12 , C21D9/46 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/60 , H01F1/147 , H01F1/18
CPC分类号： C21D9/46 , C21D6/005 , C21D6/008 , C21D8/005 , C21D8/1222 , C21D8/1233 , C21D8/1261 , C21D8/1272 , C21D8/1283 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/60 , H01F1/147 , H01F1/18 , C22C2202/02
摘要： Grain-oriented electrical steel sheet and its method of manufacture are provided. The method includes a process of heating to 1280° C. or more and hot rolling a slab containing, by mass %, Bi and a predetermined composition of constituents and having a balance of Fe and impurities to obtain hot rolled steel sheet. After hot rolling annealing, the hot rolled steel sheet is cold rolled one time or more with process annealing performed interposed so as to obtain cold rolled steel sheet, followed by a process of rapidly heating then decarburization annealing the steel sheet, a process of coating the surface of the cold rolled steel sheet after decarburization annealing with an annealing separator comprising sulfates or sulfides and having MgO as its main constituent, then performing finish annealing, a process of performing strictly controlled finish annealing, and a process of coating an insulating coating, then performing flattening annealing.
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公开(公告)号：US10544475B2
公开(公告)日：2020-01-28
申请号：US14781110
申请日：2014-03-27
发明人： Yoshihiro Suwa , Toshiki Nonaka , Koichi Sato , Manabu Naruse , Yasunori Iwasa , Yoshifumi Kobayashi
IPC分类号： C22C38/04 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C23C2/06 , C22C38/06 , C23C2/28 , C25D7/06 , C22C38/22 , C22C38/28 , C22C38/32 , C21D6/00 , C23C2/12
摘要： A hot-stamped steel according to the present invention has a predetermined chemical composition, satisfies (5×[Si]+[Mn])/[C]>10 when [C] is the amount of C by mass %, [Si] is the amount of Si by mass %, and [Mn] is the amount of Mn by mass %, includes 40% to 95% ferrite and 5% to 60% martensite in area fraction, and optionally further includes 10% or less pearlite in area fraction, 5% or less retained austenite in volume fraction, and less than 40% bainite in area fraction. The total of the area fraction of ferrite and the area fraction of martensite is 60% or more, the hardness of martensite measured with a nanoindenter satisfies H2/H1
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公开(公告)号：US11713497B2
公开(公告)日：2023-08-01
申请号：US17049493
申请日：2019-04-23
IPC分类号： C22C38/02 , C22C38/58 , C21D9/46 , C22C38/00 , C22C38/06 , C22C38/12 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C21D8/02
CPC分类号： C22C38/58 , C21D9/46 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/06 , C22C38/12 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D2211/001 , C21D2211/002 , C21D2211/008
摘要： A steel member according to an aspect of the present invention has a predetermined chemical composition, in which a metallographic structure includes, by a volume %, 60.0% to 85.0% of martensite, 10.0% to 30.0% of bainite, 5.0% to 15.0% of residual austenite, and 0% to 4.0% of a remainder in microstructure. A length of a maximum minor axis of the residual austenite is 30 nm or longer. A number density of a carbide which exist in the steel member and has a circle equivalent diameter of 0.1 μm or more and an aspect ratio of 2.5 or less is 4.0×103 pieces/mm2 or less.
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公开(公告)号：US11371110B2
公开(公告)日：2022-06-28
申请号：US16706257
申请日：2019-12-06
发明人： Yoshihiro Suwa , Toshiki Nonaka , Koichi Sato , Manabu Naruse , Yasunori Iwasa , Yoshifumi Kobayashi
IPC分类号： C21D9/46 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C23C2/06 , C22C38/06 , C23C2/28 , C25D7/06 , C22C38/22 , C22C38/28 , C22C38/32 , C23C2/40 , C23C2/02 , C21D1/673 , C22C38/26 , C21D6/00 , C23C2/12
摘要： A cold-rolled steel according to the present invention has a predetermined chemical composition, satisfies (5×[Si]+[Mn])/[C]>10 when [C] is the amount of C by mass %, [Si] is the amount of Si by mass %, and [Mn] is the amount of Mn by mass %, includes 40% to 95% ferrite and 5% to 60% martensite in area fraction, and optionally further includes 10% or less pearlite in area fraction, 5% or less retained austenite in volume fraction, and less than 40% bainite in area fraction. The total of the area fraction of ferrite and the area fraction of martensite is 60% or more, the hardness of martensite measured with a nanoindenter satisfies H2/H1
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