公开(公告)号：US20220250131A1

公开(公告)日：2022-08-11

申请号：US17728195

申请日：2022-04-25

申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

发明人： Takayuki YAMANO ,  Jiro IWAYA ,  Noriyuki JIMBO ,  Tatsuya ASAI ,  Naoki MIZUTA

IPC分类号： B21D22/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/28 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/50 ,  C22C38/54 ,  C22C38/30 ,  C21D1/673 ,  B21D22/20 ,  C22C38/58 ,  C21D8/02 ,  C22C38/32

摘要： To establish a method for obtaining a hot-press-formed steel member, which exhibits high strength, high tensile elongation (ductility) and high bendability, thereby having excellent deformation characteristics at the time of collision crush (crashworthiness), and which is capable of ensuring excellent delayed fracture resistance. A method for producing a hot-press-formed steel member by heating a steel sheet, which has a chemical component composition containing 0.10% (% by mass, and hereinafter the same shall apply) to 0.30% (inclusive) of C, 1.0% to 2.5% (inclusive) of Si, 1.0% to 3.0% (inclusive) of Si and Al in total and 1.5% to 3.0% (inclusive) of Mn, with the balance consisting of iron and unavoidable impurities, and hot press forming the steel sheet one or more times. The method for producing a hot-press-formed steel member is characterized in that: the heating temperature is set to not less than the Ac3 transformation point; the starting temperature of the hot pressing is set to not more than the heating temperature but not less than the Ms point; and the average cooling rate from (the Ms point−150)° C. to 40° C. is set to 5° C./s or less.

公开(公告)号：US20190105700A1

公开(公告)日：2019-04-11

申请号：US16089494

申请日：2017-03-08

申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

发明人： Noriyuki JIMBO ,  Takayuki YAMANO ,  Shinichi YAMAMOTO

IPC分类号： B21D39/03 ,  B21D22/20 ,  C22C38/60 ,  C22C38/14 ,  C22C38/12 ,  C22C38/02 ,  C22C38/06

摘要： In one aspect of the present invention, a mechanical clinched joint component is a mechanical clinched joint component formed of two or more steel sheets, where the component includes at least one joint portion having a peel strength of 0.200 kN/mm or greater, and the component has a hardness of 360 Hv or greater. A method for manufacturing the component sequentially includes heating the two or more steel sheets to an Ac3 temperature or above, and performing mechanical clinch joining so that a carbon equivalent Ceq of the steel sheets, and a bottom-dead-center holding time t and a joining start temperature T during mechanical clinch joining satisfy relationships of equation (1) below and of equation (2) below: Ceq×(0.00209×t+0.000731×T−0.0365)≥0.200   (1), and Ceq≥0.00071×T+0.993   (2).