公开(公告)号：US20240318289A1

公开(公告)日：2024-09-26

申请号：US18579095

申请日：2021-07-14

申请人： NIPPON STEEL CORPORATION

发明人： Hiroyuki HIRATA ,  Katsuki TANAKA ,  Masayuki TAKIGUCHI ,  Mitsuru YOSHIZAWA ,  Junichi HIGUCHI ,  Takahiro OSUKI

IPC分类号： C22C38/54 ,  C21D1/18 ,  C21D1/28 ,  C21D6/00 ,  C21D8/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52

CPC分类号： C22C38/54 ,  C21D1/18 ,  C21D1/28 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C21D2211/005

摘要： Provided is a heat-resistant ferritic steel having a chemical composition containing, by mass %, C: 0.07 to 0.14%, Si: 0.15 to 0.35%, Mn: 0.30 to 0.55%, P: 0.0250% or less, S: 0.0030% or less, Ni: 0.15 to 0.35%, Cr: 8.0 to 9.7%, Mo: 0.20 to 0.60%, W: 1.50 to 2.30%, V: 0.16 to 0.25%, Nb: 0.020 to 0.120%, B: 0.0010 to 0.0050%, N: 0.010 to 0.080%, Al: 0.020% or less, and O: 0.020% or less, with the balance Fe and impurities, wherein VER, i.e., the V content (mass %) in precipitates obtained by extracted residue analysis satisfies [−0.2×C+0.060≤VER≤−0.1×C+0.160].

公开(公告)号：US20230220508A1

公开(公告)日：2023-07-13

申请号：US17996700

申请日：2021-04-21

申请人： NIPPON STEEL CORPORATION

发明人： Hiroyuki HIRATA ,  Masahiro SETO ,  Mitsuru YOSHIZAWA ,  Junichi HIGUCHI ,  Takahiro OSUKI

IPC分类号： C21D6/00 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/46

CPC分类号： C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/005 ,  C22C38/002 ,  C22C38/001 ,  C22C38/46 ,  C21D2211/001

摘要： A method for producing an austenitic heat resistant steel in which a difference between a content of Nb and an amount of Nb analyzed as extraction residues satisfies [0.170≤Nb−NbER≤0.480], the method including: a forming step of machining and forming a steel having a predetermined chemical composition into a product shape; a solution heat treatment step of performing, after the forming step, heat treatment under conditions including a heat treatment temperature satisfying [−250Nb+1200≤T≤−100Nb+1290] and a soaking time satisfying [405−0.3T≤t≤2475−1.5T]; and a cooling step of performing cooling after the solution heat treatment step.

公开(公告)号：US20230203629A1

公开(公告)日：2023-06-29

申请号：US17996543

申请日：2021-04-21

申请人： NIPPON STEEL CORPORATION

发明人： Masahiro SETO ,  Hiroyuki HIRATA ,  Mitsuru YOSHIZAWA ,  Junichi HIGUCHI ,  Takahiro OSUKI

IPC分类号： C22C38/48 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C33/04 ,  C21D8/02 ,  C21D6/00 ,  C21D1/84

CPC分类号： C22C38/48 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/005 ,  C22C38/002 ,  C22C38/001 ,  C22C33/04 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D1/84 ,  C21D2211/001

摘要： There is provided an austenitic heat resistant steel including a chemical composition that consists of, in mass %, C: 0.04 to 0.12%, Si: 0.01 to 0.30%, Mn: 0.50 to 1.50%, P: 0.001 to 0.040%, S: less than 0.0050%, Cu: 2.2 to 3.8%, Ni: 8.0 to 11.0%, Cr: 17.7 to 19.3%, Mo: 0.01 to 0.55%, Nb: 0.400 to 0.650%, B: 0.0010 to 0.0060%, N: 0.050 to 0.160%, Al: 0.025% or less, and O: 0.020% or less, with the balance: Fe and impurities and that satisfies [0.170≤Nb−NbER≤0.480].

公开(公告)号：US20240240295A1

公开(公告)日：2024-07-18

申请号：US18249779

申请日：2021-08-06

申请人： NIPPON STEEL CORPORATION

发明人： Hiroyuki HIRATA ,  Mitsuru YOSHIZAWA ,  Katsuki TANAKA ,  Takahiro OSUKI

IPC分类号： C22C38/58 ,  C22C30/02 ,  C22C30/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/16 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54

CPC分类号： C22C38/58 ,  C22C30/02 ,  C22C30/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/16 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54

摘要： A composite tube is provided that includes a first tube and a second tube. A chemical composition of the first tube includes, in mass %, C: more than 0.060% to 0.400% or less, Si: 0.01 to 1.00%, Mn: 0.01 to 1.20%, P: 0.0350% or less, S: 0.0150% or less, Sn: 0.0005 to 0.0400%, Al: 0.040% or less, N: 0.050% or less, O: 0.030% or less, and the balance: Fe and impurities. A chemical composition of the second tube includes, in mass %, C: 0.003 to 0.100%, Si: 0.01 to 1.50%, Mn: 0.01 to 2.20%, P: 0.0400% or less, S: 0.0100% or less, Sn: 0.0005 to 0.0300%, Ni: 7.0 to 52.0%, Cr: 15.0 to 27.0%, Al: 0.001 to 0.600%, N: 0.001 to 0.150%, O: 0.030% or less, and the balance: Fe and impurities. The composite tube satisfies formulas [Siave+6×Pave+20×Save+2×Snave≤1.1000] and [0.0015≤4×Save+Snave].

公开(公告)号：US20200239986A1

公开(公告)日：2020-07-30

申请号：US16753182

申请日：2018-10-03

申请人： NIPPON STEEL CORPORATION

发明人： Hiroyuki HIRATA ,  Kana JOTOKU ,  Katsuki TANAKA

IPC分类号： C22C38/58 ,  B23K35/30 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00

摘要： An austenitic stainless steel weld metal which has a chemical composition consisting of, by mass %, C: 0.05 to 0.11%, Si: 0.10 to 0.50%, Mn: 1.0 to 2.5%, P: 0.035% or less, S: 0.0030% or less, Co: 0.01 to 1.00%, Ni: 9.0 to 11.5%, Cr: 17.0 to 21.0%, Nb: 0.60 to 0.90%, Ta: 0.001 to 0.100%, N: 0.01 to 0.15%, Al: 0.030% or less, O: 0.020% or less, V: 0 to 0.10%, Ti: 0 to 0.10%, W: 0 to 0.50%, Mo: 0 to 0.50%, Cu: 0 to 0.50%, B: 0 to 0.005%, Ca: 0 to 0.010%, Mg: 0 to 0.010% and REM: 0 to 0.10%, with the balance being Fe and impurities, and satisfying [Nb-7.8×C≤0.25].

公开(公告)号：US20220325394A1

公开(公告)日：2022-10-13

申请号：US17635312

申请日：2020-07-30

申请人： NIPPON STEEL CORPORATION

发明人： Hiroyuki HIRATA ,  Mitsuru YOSHIZAWA ,  Junichi HIGUCHI ,  Katsuki TANAKA

IPC分类号： C22C38/54 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/52 ,  C21D6/00

摘要： An austenitic heat resisting steel includes, as a chemical composition, by mass %: C: 0.04% to 0.12%; Si: 0.10% to 0.30%; Mn: 0.20% to 0.80%; P: 0% to 0.030%; S: 0.0001% to 0.0020%: Sn: 0.0005% to 0.0230%; Cu: 2.3% to 3.8%; Co: 0.90% to 2.40%; Ni: 22.0% to 28.0%; Cr: 20.0% to 25.0%; Mo: 0.01% to 0.40%; W: 2.8% to 4.2%; Nb: 0.20% to 0.80%; B: 0.0010% to 0.0050%; and N: 0.16% to 0.30%, and a remainder of Fe and impurities, optionally further includes one or more selected from Al, O, V, Ti, Ta, C, Mg, and REM, in which 0.0012%≤[% S]+[% Sn]≤2.5×[% B]+0.0125% is satisfied.

公开(公告)号：US20200318225A1

公开(公告)日：2020-10-08

申请号：US16753212

申请日：2018-10-03

申请人： NIPPON STEEL CORPORATION

发明人： Hiroyuki HIRATA ,  Katsuki TANAKA ,  Kana JOTOKU

IPC分类号： C22C38/42 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/48 ,  C22C38/52 ,  C22C38/54 ,  C22C38/58 ,  C21D8/00

摘要： A austenitic stainless steel which has a chemical composition consisting of, by mass %, C: 0.04 to 0.12%, Si: 0.25 to 0.55%, Mn: 0.7 to 2.0%, P: 0.035% or less, S: 0.0015% or less, Cu: 0.02 to 0.80%, Co: 0.02 to 0.80%, Ni: 10.0 to 14.0%, Cr: 15.5 to 17.5%, Mo: 1.5 to 2.5%, N: 0.01 to 0.10%, Al: 0.030% or less, O: 0.020% or less, Sn: 0 to 0.01%, Sb: 0 to 0.01%, As: 0 to 0.01%, Bi: 0 to 0.01%, V: 0 to 0.10%, Nb: 0 to 0.10%, Ti: 0 to 0.10%, W: 0 to 0.50%, B: 0 to 0.005%, Ca: 0 to 0.010%, Mg: 0 to 0.010% and REM: 0 to 0.10%, with the balance being Fe and impurities, and satisfying [18.0≤Cr+Mo+1.5×Si≤20.0] and [14.5≤Ni+30×(C+N)+0.5×(Mn+Cu+Co)≤19.5].

公开(公告)号：US20200283878A1

公开(公告)日：2020-09-10

申请号：US16753200

申请日：2018-10-03

申请人： NIPPON STEEL CORPORATION

发明人： Hiroyuki HIRATA ,  Katsuki TANAKA ,  Kana JOTOKU

IPC分类号： C22C38/54 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/20 ,  C22C38/60 ,  C21D9/50 ,  B23K35/02

摘要： A austenitic stainless steel weld metal which has a chemical composition consisting of, by mass %, C: 0.01 to 0.10%, Si: 0.20 to 0.70%, Mn: 0.8 to 2.5%, P: 0.035% or less, S: 0.0030% or less, Cu: 0.01 to 0.60%, Co: 0.01 to 1.00%, Ni: 8.0 to 12.0%, Cr: 14.5 to 17.5%, Mo: 1.0 to 2.2%, N: 0.02 to 0.10%, Al: 0.030% or less, O: 0.020% or less, Sn: 0 to 0.01%, Sb: 0 to 0.01%, As: 0 to 0.01%, Bi: 0 to 0.01%, V: 0 to 0.10%, Nb: 0 to 0.10%, Ti: 0 to 0.10%, W: 0 to 0.50%, B: 0 to 0.005%, Ca: 0 to 0.010%, Mg: 0 to 0.010% and REM: 0 to 0.10%, with the balance being Fe and impurities, and satisfying [17.5≤Cr+Mo+1.5×Si≤19.5] and [11.0≤Ni+30×(C+N)+0.5×(Mn+Cu+Co)≤17.0].

公开(公告)号：US20220235445A1

公开(公告)日：2022-07-28

申请号：US17438939

申请日：2020-03-19

申请人： NIPPON STEEL CORPORATION

发明人： Hiroyuki HIRATA ,  Mitsuru YOSHIZAWA ,  Junichi HIGUCHI ,  Katsuki TANAKA

IPC分类号： C22C38/54 ,  C22C38/52 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

摘要： A ferritic heat-resistant steel includes, by mass: from 0.06 to 0.11% of C; from 0.15 to 0.35% of Si; from 0.35 to 0.65% of Mn; from 0 to 0.02% of P; from 0 to 0.003% of S; from 0.005 to 0.25% of Ni; from 0.005 to 0.25% of Cu; from 2.7 to 3.3% of Co; from 8.3 to 9.7% of Cr; from 2.5 to 3.5% of W; from 0.15 to 0.25% of V; from 0.03 to 0.08% of Nb; from 0.002 to 0.04% of Ta; from 0.01 to 0.06% of Nd; from 0.006 to 0.016% of B; from 0.005 to 0.015% of N; from 0 to 0.02% of Al; and from 0 to 0.02% of O, with a balance consisting of Fe and impurities, and an amount of W, which is analyzed as an electrolytically extracted residue, [% W]ER, satisfying: −10×[% B]+0.26≤[% W]ER≤10×[% B]+0.54.

公开(公告)号：US20200325565A1

公开(公告)日：2020-10-15

申请号：US16760775

申请日：2018-11-01

申请人： NIPPON STEEL CORPORATION

发明人： Shinnosuke KURIHARA ,  Hiroyuki HIRATA ,  Hiroyuki SEMBA ,  Kana JOTOKU

IPC分类号： C22C38/54 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/52 ,  C22C38/50 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  B23K35/30

摘要： An austenitic heat-resistant steel weld metal with low high-temperature cracking susceptibility and good creep strength is provided. The austenitic heat-resistant steel weld metal has a chemical composition of, in mass %: 0.06% -0.14% C; 0.1%-0.6%Si; 0.1%-1.8%Mn; up to 0.025% P; up to 0.003% S; 25%-35% Ni; 20%-24% Cr; more than 4.5% and up to 7.5% W; 0.05%-0.5% Nb; 0.05%-0.4% V; 0.1%-0.35% N; up to 0.08% Al; up to 0.08% O; and 0.0005 to 0.005% B, fn1 expressed by the following Equation (1) being not less than 10: fn1=10(Nb+V)+1.5W+20N+1500B−25Si   (1), where, for Nb, V, W, N, B and Si in Equation (1), the contents of the named elements in mass % are substituted.