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1.发明申请公开(公告)号：US20190153575A1
公开(公告)日：2019-05-23
申请号：US15550223
申请日：2016-02-08
发明人： Kosuke SHIBATA , Toshiya NAKATA , Toshio MURAKAMI , Takahiro OZAWA , Fumio YUSE , Atsuhiro SHIRAKI , Kenji SAITO , Yukihiro UTSUMI
摘要： Provided is an ultra-high-strength steel sheet having a component composition that includes specific amounts of each of C, Mn, and Al and a remainder of iron and unavoidable impurities, and in which the amounts of each of P, S, and N among the unavoidable impurities are limited to a specific amount. The ultra-high-strength steel sheet includes 2 area % or more of a region having a structure that includes 90% or more of martensite and 0.5% or more of residual austentite by area ratio relative to the entire structure, the local Mn concentration in said region being at least 1.1 times that of the Mn content of the entire steel sheet. The ultra-high-strength steel sheet has a tensile strength of 1470 MPa or more.
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公开(公告)号：US20190032166A1
公开(公告)日：2019-01-31
申请号：US15550180
申请日：2016-02-08
发明人： Kosuke SHIBATA , Toshiya NAKATA , Toshio MURAKAMI , Takahiro OZAWA , Fumio YUSE , Atsuhiro SHIRAKI , Kenji SAITO , Yukihiro UTSUMI
IPC分类号： C21D9/46 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/08 , C22C38/18 , C21D8/02 , C21D6/00
摘要： An ultra-high-strength steel sheet having a component composition that includes specific amounts of each of C, Si, Mn, and Al and a remainder of iron and unavoidable impurities, and in which the amounts of each of P, S, and N among the unavoidable impurities are limited to a specific amount. The ultra-high-strength steel sheet includes 1 area % or more of a region in which martensite constitutes 90 area % or more, residual austentite constitutes 0.5 area % or more, and the local Mn concentration is at least 1.2 times that of the Mn content of the entire steel sheet. The ultra-high-strength steel sheet has a tensile strength of 1470 MPa or more, a yield ratio of 0.75 or more, and a total elongation of 10% or more.
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