公开(公告)号：US20230212724A1

公开(公告)日：2023-07-06

申请号：US18001149

申请日：2021-06-23

申请人： NIPPON STEEL CORPORATION

发明人： Hiroyuki HIRATA ,  Shohgo AOTA ,  Mitsuru YOSHIZAWA ,  Takahiro OSUKI

IPC分类号： C22C38/58 ,  C22C38/00 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/02 ,  C21D9/08 ,  C21D8/10

CPC分类号： C22C38/58 ,  C22C38/001 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/02 ,  C22C38/008 ,  C22C38/005 ,  C22C38/002 ,  C21D9/08 ,  C21D8/105 ,  F16L13/02

摘要： There is provided a duplex stainless steel tube including a chemical composition consisting of, in mass %, C: 0.008 to 0.030%, Si: 0.10 to 0.70%, Mn: 0.80 to 2.60%, P: 0.030% or less, S: 0.0001 to 0.0050%, O: 0.0004 to 0.0150%, Sn: 0.0001% or more to less than 0.0100%, Cu: 0.10 to 2.50%, Ni: more than 2.50 to 5.50% or less, Cr: 21.5 to 25.5%, Mo: 0.10 to 0.50%, N: 0.050 to 0.200%, Al: 0.200% or less, and optional elements, with the balance: Fe and impurities, wherein 4S+8O+Sn is 0.0040 to 0.0900, and 4S+Sn is 0.0180 or less.

公开(公告)号：US20240175113A1

公开(公告)日：2024-05-30

申请号：US18552084

申请日：2022-03-30

申请人： NIPPON STEEL CORPORATION

发明人： Takahiro OSUKI ,  Shohgo AOTA ,  Takahiro IZAWA ,  Shinnosuke KURIHARA

IPC分类号： C22C38/54 ,  B23K31/02 ,  B23K35/30 ,  B23K101/04 ,  B23K103/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/52

CPC分类号： C22C38/54 ,  B23K35/3086 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/52 ,  B23K31/027 ,  B23K2101/04 ,  B23K2103/05

摘要： A duplex stainless steel welded joint is provided that can suppress undercuts and is excellent in fatigue characteristics. The duplex stainless steel welded joint includes a base metal, and a weld metal consisting of, in mass %, C: 0.001% to 0.030%, Si: 0.05% to 0.70%, Mn: 0.05% to 0.85%, P: 0.030% or less, S: 0.0030% or less, Cr: 21.00% to 28.00%, Ni: 5.00% to 11.00%, Mo: 2.00% to 4.50%, Cu: 0.01 to 4.00%, sol. Al: 0.0010 to 0.0500%, N: 0.080% to 0.400%, and B: 0.0001 to 0.0100%, with the balance being Fe and impurities, and satisfies the content of each element in the base metal and the weld metal, and also satisfies Formula (1) and Formula (2).


Si+3Mn≤3.00  (1)



0

公开(公告)号：US20220411908A1

公开(公告)日：2022-12-29

申请号：US17757126

申请日：2021-01-08

申请人： NIPPON STEEL CORPORATION

发明人： Takahiro OSUKI ,  Shinnosuke KURIHARA ,  Kana JOTOKU ,  Yuhei SUZUKI ,  Shohgo AOTA

IPC分类号： C22C38/58 ,  C22C38/44 ,  C22C38/48 ,  C22C38/00 ,  C22C38/02 ,  C21D8/02 ,  C22C38/54

摘要： An austenitic stainless steel material is provided that has high creep strength even when used at an average operation temperature of more than 600 to 750° C. after welding with higher heat input, and furthermore, has excellent stress relaxation cracking resistance even after use for a long time period at the average operation temperature after welding with higher heat input. The steel material has a chemical composition which consists of, in mass %, C: 0.030% or less, Si: 1.50% or less, Mn: 2.00% or less, P: 0.045% or less, S: 0.0300% or less, Cr: 15.00 to 25.00%, Ni: 8.00 to 20.00%, N: 0.050 to 0.250%, Nb: 0.10 to 1.00%, Mo: 0.05 to 5.00%, and B: 0.0005 to 0.0100%, with the balance being Fe and impurities, and a ratio of the dissolved N amount (mass %) with respect to the content of N (mass %) in the steel material is 0.40 to 0.90.

公开(公告)号：US20220259688A1

公开(公告)日：2022-08-18

申请号：US17597682

申请日：2020-07-22

申请人： NIPPON STEEL CORPORATION

发明人： Takahiro OSUKI ,  Yuhei SUZUKI ,  Shohgo AOTA ,  Hirokazu OKADA ,  Masahiro SETO

IPC分类号： C21D8/00 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D6/00

摘要： An austenitic stainless steel material is provided that has excellent sensitization resistance properties even after use for a long time period at an average operation temperature of 400 to 700° C. after welding with higher heat input. The steel material of the present disclosure has a chemical composition which contains, in mass %, C: 0.020% or less, Si: 1.50% or less, Mn: 2.00% or less, P: 0.045% or less, S: 0.0300% or less, Cr: 15.00 to 25.00%, Ni: 9.00 to 20.00%, N: 0.05 to 0.15%, Nb: 0.1 to 0.8%, Mo: 0.10 to 4.50%, and W: 0.01 to 1.00%, and satisfies Formula (1). The content of Nb in a residue obtained by an extraction residue method is, in mass %, 0.050 to 0.267%, and the content of Cr in the residue is, in mass %, 0.125% or less. 21.9Mo+5.9W−5.0≥0  (1)