公开(公告)号：EP4417728A1

公开(公告)日：2024-08-21

申请号：EP24157125.6

申请日：2024-02-12

申请人： Daido Steel Co., Ltd.

发明人： TAKAHASHI, Nobuyuki ,  KUDO, Daisuke ,  ANDO, Tomohiro ,  KOYANAGI, Yoshihiko ,  OGAWA, Yuhei ,  MATSUNAGA, Hisao

IPC分类号： C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/46 ,  C22C38/54 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C21D8/00 ,  C21D6/00 ,  C21D6/04 ,  C21D1/18 ,  C21D1/22

CPC分类号： C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/46 ,  C22C38/54 ,  C22C38/02 ,  C22C38/04 ,  C22C38/001 ,  C21D8/005 ,  C21D6/004 ,  C21D6/04 ,  C21D1/18 ,  C21D1/22 ,  C21D2211/00820130101

摘要： Disclosed is a martensitic stainless steel for a hydrogen gas environment, having a composition consisting of: 0.02 mass% ≤ C ≤ 0.30 mass%, Si ≤ 1.50 mass%, Mn ≤ 1.50 mass%, P ≤ 0.150 mass%, S ≤ 0.150 mass%, 8.0 mass% ≤ Cr ≤ 22.0 mass%, 1.0 mass% ≤ Ni ≤ 6.0 mass%, 0.01 mass% ≤ Nb ≤ 1.0 mass%, and N ≤ 0.12 mass%, and optionally at least one selected from the group consisting of: Cu ≤ 6.00 mass%, Mo ≤ 3.00 mass%, V ≤ 1.50 mass%, and B ≤ 0.0500 mass%, with the balance being Fe and inevitable impurities; having: a crystal grain size number of prior austenite grains of 2.0 or more, an amount of retained austenite of 40 vol% or less, a tensile strength of 1,500 MPa or less, and satisfying DH2(0.7)/Dair ≥ 0.8.

公开(公告)号：EP4389921A1

公开(公告)日：2024-06-26

申请号：EP23219485.2

申请日：2023-12-21

申请人： Daido Steel Co., Ltd.

发明人： TAKAHASHI, Nobuyuki ,  KUDO, Daisuke ,  ANDO, Tomohiro ,  KOYANAGI, Yoshihiko ,  OGAWA, Yuhei ,  MATSUNAGA, Hisao

IPC分类号： C21D1/22 ,  C21D1/25 ,  C21D1/32 ,  C21D6/00 ,  C21D6/02 ,  C21D6/04 ,  C22C38/02 ,  C22C38/04 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/32 ,  C22C38/40 ,  C22C38/60

CPC分类号： C22C38/04 ,  C22C38/02 ,  C22C38/32 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/40 ,  C22C38/20 ,  C22C38/60 ,  C21D2211/00820130101 ,  C21D1/22 ,  C21D1/25 ,  C21D1/32 ,  C21D6/002 ,  C21D2211/00420130101 ,  C21D6/04 ,  C21D6/02

摘要： Disclosed is a martensitic stainless steel material for a hydrogen gas environment, having a composition consisting of 0.03 mass% ≤ C ≤ 1.20 mass%, Si ≤ 1.00 mass%, Mn ≤ 1.50 mass%, P ≤ 0.060 mass%, S ≤ 0.250 mass%, Cu ≤ 0.50 mass%, 8.0 mass% ≤ Cr ≤ 22.0 mass%, Ni ≤ 1.00 mass%, and N ≤ 0.40 mass%, and optionally at least one selected from the group consisting of Mo ≤ 3.00 mass%, V ≤ 1.50 mass%, Nb ≤ 1.00 mass%, Pb ≤ 0.30 mass%, and B ≤ 0.0500 mass%, with the balance being Fe and inevitable impurities; having: a content of a precipitate of 1.50 mass% or more, a crystal grain size number of prior austenite grains of 2.0 or more, a metal structure including a martensite structure, a tensile strength of 1,800 MPa or less, and satisfying DH2(0.7)/Dair ≥ 0.8.

公开(公告)号：EP4227433A1

公开(公告)日：2023-08-16

申请号：EP23156487.3

申请日：2023-02-14

申请人： Daido Steel Co., Ltd.

发明人： TAKAHASHI, Nobuyuki ,  KUDO, Daisuke ,  ANDO, Tomohiro ,  KOYANAGI, Yoshihiko

IPC分类号： C22C38/58 ,  C22C38/44 ,  C22C38/46 ,  C22C38/54 ,  C22C38/42 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/50 ,  C21D8/02 ,  C21D6/00 ,  C21D6/02 ,  C21D1/26 ,  C21D7/13

摘要： The present disclosure relates to an austenitic stainless steel contains C ≤ 0.10 mass%, Si ≤ 0.50 mass%, 3.0 ≤ Mn ≤ 8.0 mass%, P ≤ 0.30 mass%, S ≤ 0.30 mass%, 7.0 ≤ Ni ≤ 12.0 mass%, 18.0 ≤ Cr ≤ 28.0 mass%, 1.0 ≤ Mo ≤ 3.0 mass%, 0.03 ≤ V ≤ 0.50 mass%, 0.0003 ≤ B ≤ 0.0300 mass%, 0.0001 ≤ Ca ≤ 0.0300 mass%, 0.35 ≤ N ≤ 0.80 mass%, W ≤ 2.0 mass%, Zr ≤ 0.20 mass%, Cu ≤ 0.5 mass%, Al ≤ 0.10 mass%, and O ≤ 0.050 mass%, with a balance being Fe and unavoidable impurities. The austenitic stainless steel has a number density of coarse alloy carbonitrides of 3×10 5 pieces/mm 2 or less,