公开(公告)号：US12054798B2

公开(公告)日：2024-08-06

申请号：US17265614

申请日：2019-10-16

申请人： NIPPON STEEL CORPORATION

发明人： Yuji Arai ,  Shinji Yoshida ,  Hiroki Kamitani ,  Yohei Otome

IPC分类号： C21D8/10 ,  C21D6/00 ,  C21D9/00 ,  C21D9/08 ,  C22C38/00 ,  C22C38/44 ,  C22C38/46 ,  C22C38/54

CPC分类号： C21D8/105 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D9/085 ,  C22C38/001 ,  C22C38/44 ,  C22C38/46 ,  C22C38/54

摘要： The steel material according to the present disclosure has a chemical composition consisting of, in mass %, C: 0.15 to 0.45%, Si: 0.05 to 1.00%, Mn: 0.01 to 1.00%, P: 0.030% or less, S: 0.0050% or less, Al: 0.005 to 0.100%, Cr 0.60 to 1.80%, Mo: 0.80 to 2.30%, Ti: 0.002 to 0.020%, V: 0.05 to 0.30%, Nb: 0.002 to 0.100%, B: 0.0005 to 0.0040%, Cu: 0.01 to 0.50%, Ni: 0.01 to 0.50%, N: 0.0020 to 0.0100% and O: 0.0020% or less, with the balance being Fe and impurities. The number density of BN in the steel material is 10 to 100 particles/100 μm2. The yield strength of the steel material is 758 MPa or more.

公开(公告)号：US11891680B2

公开(公告)日：2024-02-06

申请号：US17414727

申请日：2020-02-13

申请人： NIPPON STEEL CORPORATION

发明人： Yohei Otome ,  Hiroki Kamitani ,  Atsushi Soma ,  Taro Oe ,  Nobuaki Komatsubara ,  Yuji Arai ,  Hideki Takabe

IPC分类号： C22C38/32 ,  C21D8/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/40 ,  C21D1/25 ,  C22C38/44

CPC分类号： C22C38/32 ,  C21D1/25 ,  C21D8/105 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/40 ,  C22C38/44 ,  C21D2211/001

摘要： A steel material according to the present disclosure has a chemical composition consisting of, in mass %: C: 0.15 to 0.45%, Si: 0.05 to 1.00%, Mn: 0.01 to 1.00%, P: 0.030% or less, S: 0.0050% or less, Al: 0.005 to 0.100%, Cr 0.55 to 1.10%, Mo: 0.70 to 1.00%, Ti: 0.002 to 0.020%, V: 0.05 to 0.30%, Nb: 0.002 to 0.100%, B: 0.0005 to 0.0040%, N: 0.0100% or less, O: less than 0.0020%, and the balance being Fe and impurities, and satisfying Formula (1) described in the specification. A grain diameter of a prior-austenite grain is 15.0 μm or less, and an average area of precipitate which is precipitated in a prior-austenite grain boundary is 12.5×10−3 μm2 or less. A yield strength is 758 to 862 MPa.