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公开(公告)号：US20220364196A1
公开(公告)日：2022-11-17
申请号：US17770118
申请日：2020-10-08
发明人： Kazuki Endoh , Yoshiyasu Kawasaki , Yuki Toji
IPC分类号： C21D9/46 , B32B15/01 , C22C38/38 , C22C38/28 , C22C38/16 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00 , C23C2/40 , C23C2/28
摘要： Provided is a high strength steel sheet that has a predetermined chemical composition and is manufactured under optimum conditions, the high strength steel sheet having a steel microstructure including, by area, ferrite: 30% or more and 80% or less, tempered martensite: 3.0% or more and 35% or less, and retained austenite: 8% or more, wherein the quotient of the area fraction of grains of the retained austenite, the grains having an aspect ratio of 2.0 or more and a minor axis length of 1 μm or less, divided by the total area fraction of the retained austenite is 0.3 or more, wherein the quotient of the average Mn content (mass %) in the retained austenite divided by the average Mn content (mass %) in the ferrite is 1.5 or more.
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公开(公告)号：US20220396847A1
公开(公告)日：2022-12-15
申请号：US17770336
申请日：2020-10-08
发明人： Kazuki Endoh , Yoshiyasu Kawasaki , Yuki Toji
IPC分类号： C21D9/46 , C22C38/02 , C22C38/00 , C22C38/06 , C22C38/04 , C21D8/02 , C23C2/06 , C23C2/40 , B21C47/02
摘要： Provided is a high strength steel sheet that has a predetermined chemical composition and is manufactured under optimum conditions, the high strength steel sheet having a steel microstructure including, by area, ferrite: 30% or more and 80% or less, tempered martensite: 3.0% or more and 35% or less, and retained austenite: 8% or more, wherein the quotient of the area fraction of grains of the retained austenite, the grains having an aspect ratio of 2.0 or more and a minor axis length of 1 μm or less, divided by the total area fraction of the retained austenite is 0.3 or more, wherein the quotient of the average Mn content (mass %) in the retained austenite divided by the average Mn content (mass %) in the ferrite is 1.5 or more.
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公开(公告)号：US20220267876A1
公开(公告)日：2022-08-25
申请号：US17770116
申请日：2020-10-08
发明人： Kazuki Endoh , Yoshiyasu Kawasaki , Yuki Toji
IPC分类号： C21D9/46 , C21D8/02 , B32B15/01 , C22C38/38 , C22C38/16 , C22C38/12 , C22C38/60 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C23C2/06 , C23C2/28 , C23C2/40
摘要： Provided is a high strength steel sheet that has a predetermined chemical composition and is manufactured under optimum conditions, the high strength steel sheet having a steel microstructure including, by area, ferrite: 30% or more and 80% or less, martensite: 5% or more and 35% or less, and retained austenite: 8% or more, wherein the quotient of the area fraction of grains of the retained austenite, the grains having an aspect ratio of 2.0 or more and a minor axis length of 1 μm or less, divided by the total area fraction of the retained austenite is 0.3 or more, wherein the quotient of the average Mn content (mass %) in the retained austenite divided by the average Mn content (mass %) in the ferrite is 1.5 or more.
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公开(公告)号：US20240167128A1
公开(公告)日：2024-05-23
申请号：US18274778
申请日：2021-11-12
发明人： Kazuki Endoh , Yoshiyasu Kawasaki , Yuki Toji
CPC分类号： C22C38/04 , C21D6/005 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0273 , C22C38/02 , C22C38/06 , C23C2/06 , C23C2/28 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008
摘要： A high-strength steel sheet is disclosed having a specified chemical composition and a steel microstructure composed of, on an area fraction basis, ferrite: 1% to 40%, fresh martensite: less than 1.0%, bainite and tempered martensite in total: 40% to 90%, and retained austenite: 6% or more, wherein a value obtained by dividing an average Mn content (% by mass) of the retained austenite by an average Mn content (% by mass) of the ferrite is 1.1 or more, and a value obtained by dividing an average C content (% by mass) of retained austenite with an aspect ratio of 2.0 or more by an average C content (% by mass) of the ferrite is 3.0 or more, and a diffusible hydrogen content of steel is 0.3 ppm by mass or less.
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公开(公告)号：US20220396855A1
公开(公告)日：2022-12-15
申请号：US17770328
申请日：2020-10-08
发明人： Kazuki Endoh , Yoshiyasu Kawasaki , Yuki Toji
IPC分类号： C22C38/00 , C22C38/02 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/60 , C21D8/02 , C21D9/46 , C22C38/04 , C23C2/06 , C23C2/40
摘要： Provided is a high strength steel sheet that has a predetermined chemical composition and is manufactured under optimum conditions, the high strength steel sheet having a steel microstructure including, by area, ferrite: 30% or more and 80% or less, martensite: 5% or more and 35% or less, and retained austenite: 8% or more, wherein the quotient of the area fraction of grains of the retained austenite, the grains having an aspect ratio of 2.0 or more and a minor axis length of 1 μm or less, divided by the total area fraction of the retained austenite is 0.3 or more, wherein the quotient of the average Mn content (mass %) in the retained austenite divided by the average Mn content (mass %) in the ferrite is 1.5 or more.
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公开(公告)号：US20240167127A1
公开(公告)日：2024-05-23
申请号：US18274771
申请日：2021-11-12
发明人： Kazuki Endoh , Yoshiyasu Kawasaki , Yuki Toji
CPC分类号： C22C38/04 , C21D6/005 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0273 , C22C38/02 , C22C38/06 , C23C2/06 , C23C2/28 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008
摘要： A high-strength steel sheet is disclosed having a specified chemical composition and a steel microstructure composed of, on an area fraction basis, ferrite: 1% to 40%, fresh martensite: 1% to 20%, bainite and tempered martensite in total: 35% to 90%, and retained austenite: 6% or more, wherein a value obtained by dividing an average Mn content (% by mass) of the retained austenite by an average Mn content (% by mass) of the ferrite is 1.1 or more, and a value obtained by dividing an average C content (% by mass) of retained austenite with an aspect ratio of 2.0 or more by an average C content (% by mass) of the ferrite is 3.0 or more, and a value obtained by dividing a C content of all retained austenite by a C content of a T0 composition is 1.0 or more.
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公开(公告)号：US20240026477A1
公开(公告)日：2024-01-25
申请号：US17791322
申请日：2020-01-10
发明人： Kazuki Endoh , Yoshiyasu Kawasaki , Yuki Toji , Yoshimasa Funakawa , Mai Aoyama
CPC分类号： C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C22C38/002 , C22C38/02 , C22C38/001 , C22C38/06 , C21D2211/005 , C21D2211/008 , C21D2211/001
摘要： A high-strength galvanized steel sheet is disclosed which has a specified chemical composition, has a steel microstructure including, in terms of area fraction, 35% or more and 80% or less of ferrite, 0.1% or more and less than 5.0% of as-quenched martensite, 3.0% or more and 35% or less of tempered martensite, and 8% or more of retained austenite, in which an average grain diameter of the ferrite is 6 μm or less, in which an average grain diameter of the retained austenite is 3 μm or less, in which a value calculated by dividing an average Mn content (mass %) in the retained austenite by an average Mn content (mass %) in the ferrite is 1.5 or more.
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