公开(公告)号：EP4431621A1

公开(公告)日：2024-09-18

申请号：EP22892640.8

申请日：2022-10-31

Applicant: NIPPON STEEL CORPORATION

Inventor： KANKI, Kyohei ,  TAKABE, Hideki ,  NISHIHARA, Katsuhiro ,  AMINO, Takafumi

IPC: C21D8/10 ,  C22C38/00 ,  C22C38/54

CPC classification number: C22C38/00 ,  C22C38/54 ,  C21D8/10

Abstract: A martensitic stainless steel seamless pipe in which both a high yield strength, and excellent pitting resistance at the inner surface of the martensitic stainless steel seamless pipe are achieved is provided. A martensitic stainless steel seamless pipe according to the present disclosure has a chemical composition described in the description, the microstructure described in the description, and a yield strength of 862 MPa or more. An observation field of view region (50) which is 1.0 µm long in each of a pipe axis direction (L direction) and a pipe radius direction (T direction) and which includes an inner surface (10) extending in the L direction is composed of an inner surface vicinity region (20), an interior region (30) that is below contact with the inner surface vicinity region (20), and a hollow region (40). When the observation field of view region (50) is divided into sections by being divided equally into 256 sections in the L direction and divided equally into 256 sections in the T direction, an inner surface Cu occupancy OScu which is defined as the numerical proportion of sections in which a Cu concentration is more than 2.0% in the inner surface vicinity region (20), and an interior Cu occupancy OICu which is defined as the numerical proportion of sections in which the Cu concentration is more than 2.0% in the interior region (30) satisfy Formula (2). OSCu/OICu≥1.20

公开(公告)号：EP4426868A1

公开(公告)日：2024-09-11

申请号：EP22801573.1

申请日：2022-11-02

Applicant: ArcelorMittal

Inventor： HERRY, Deborah ,  GERMAIN, Fabrice ,  PHILIPPOT, Clément ,  LE GUILLARD, Sandra

IPC: C21D1/673 ,  C21D6/00 ,  C21D8/00 ,  C21D8/02 ,  C21D1/02 ,  C21D9/00 ,  C21D9/46 ,  B32B15/01 ,  B21D22/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/44 ,  C22C38/48

CPC classification number: C21D1/673 ,  C21D6/005 ,  C21D8/005 ,  C21D8/021 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D1/02 ,  C21D9/0068 ,  C21D9/46 ,  C21D2211/00220130101 ,  C21D2211/00320130101 ,  C21D2211/00520130101 ,  C21D2211/00820130101 ,  B32B15/012 ,  B32B15/013 ,  C22C38/001 ,  C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  B32B15/011 ,  C23C2/06 ,  C23C2/12

公开(公告)号：EP4424859A1

公开(公告)日：2024-09-04

申请号：EP22886523.4

申请日：2022-09-20

Applicant: NIPPON STEEL CORPORATION

Inventor： FUJINAKA, Shingo ,  NISHIBATA, Hitomi

IPC: C22C38/00 ,  C21D1/18 ,  C21D9/00 ,  C22C38/60

CPC classification number: C22C38/00 ,  C21D9/00 ,  C21D1/18 ,  C22C38/60 ,  C22C38/22 ,  C22C38/20 ,  C21D6/007 ,  C22C38/005 ,  C21D8/0205 ,  C21D8/0236 ,  C21D6/008 ,  C21D8/0263 ,  C22C38/26 ,  C22C38/54 ,  C22C38/30 ,  C22C38/32 ,  C22C38/06 ,  C22C38/28 ,  C22C38/50 ,  C22C38/002 ,  C22C38/38 ,  C21D8/0226 ,  C22C38/24 ,  C22C38/008 ,  C22C38/02 ,  C21D9/46 ,  C22C38/48 ,  C21D6/002 ,  C21D6/005 ,  C22C38/001 ,  C21D6/004 ,  C22C38/04 ,  C21D8/005 ,  C22C38/12 ,  C22C38/14 ,  C22C38/10 ,  C22C38/34 ,  C22C38/16 ,  C22C38/08 ,  C21D9/0068

Abstract: A hot-stamp formed body has a predetermined chemical composition and has a microstructure including, by area ratio, martensite: 90% to 100% and a remainder in the microstructure: 0% to 10%. The percentage of martensite having a GAIQ value of 40000 or less in all of the martensite is less than 5.0%, an average grain size of prior austenite grains is 6.0 µm or less, and a standard deviation of grain sizes of the prior austenite grains is 2.6 µm or less.

公开(公告)号：EP4424858A1

公开(公告)日：2024-09-04

申请号：EP22886940.0

申请日：2022-10-24

Applicant: Sanyo Special Steel Co., Ltd.

Inventor： MIURA Yuka ,  HAGIYA Toru ,  MAEDA Soichiro ,  AIKAWA Yoshikazu

IPC: C22C30/00 ,  C22C19/05 ,  C22C38/00 ,  C22C38/54 ,  B23K35/30 ,  B33Y80/00 ,  B33Y70/00 ,  B22F10/20 ,  B22F10/25 ,  B22F10/28 ,  B22F1/00 ,  C22C1/04

CPC classification number: Y02P10/25 ,  B22F1/00 ,  B22F10/20 ,  B22F10/25 ,  B22F10/28 ,  B23K35/30 ,  B33Y70/00 ,  B33Y80/00 ,  C22C1/04 ,  C22C19/05 ,  C22C30/00 ,  C22C38/00 ,  C22C38/54

Abstract: An object of the present invention is to provide an Ni-based alloy powder having excellent high-temperature strength and cracking resistance, which is suitable for additive manufacturing, and the present invention provides an Ni-based alloy powder consisting of, in mass% :
Ni: 40.00% to 70.00%;
Cr: 15.00% to 25.00%;
Mo: 0.10% to 12.00%;
Nb: 3.00% to 7.00%;
Al: 0.10% to 1.50%;
Ti: 0.10% to 2.00%;
Si: 0.01% to 0.40%;
C: 0.001% to 0.15%;
B: 0.0002% to 0.0040%;
S: 0% to 0.002%;
one or more of W and Co: 0% to 7.00% in total; and
the balance consisting of Fe and inevitable impurities,
wherein a value of strength parameter A1 is 200 or more, and a value of cracking resistance parameter A2 is 200 or less.

公开(公告)号：EP4423306A1

公开(公告)日：2024-09-04

申请号：EP21805650.5

申请日：2021-10-29

Applicant: ArcelorMittal

Inventor： PANAHI, Damon ,  SONG, Hyojin ,  CHALLA, Venkata Sai Ananth ,  LIN, Brian

IPC: C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/14 ,  C22C38/00 ,  C22C38/12 ,  C22C38/28 ,  C22C38/32 ,  C22C38/22 ,  C22C38/44 ,  C22C38/48 ,  C22C38/54 ,  C22C38/50 ,  C21D9/46 ,  C21D8/02 ,  C21D1/22 ,  C21D6/00 ,  B32B15/01 ,  C23C2/06 ,  C23C2/12

CPC classification number: C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/14 ,  C22C38/002 ,  C22C38/001 ,  C22C38/12 ,  C22C38/28 ,  C22C38/32 ,  C22C38/22 ,  C22C38/44 ,  C22C38/48 ,  C22C38/54 ,  C22C38/50 ,  C21D9/46 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0205 ,  C21D6/005 ,  C21D6/008 ,  C21D1/22 ,  B32B15/012 ,  B32B15/013 ,  C23C2/06

公开(公告)号：EP3730646B1

公开(公告)日：2024-08-14

申请号：EP18890153.2

申请日：2018-11-30

IPC: C22C38/60 ,  C22C38/06 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/32 ,  C22C38/22 ,  C22C38/54 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C23C2/02 ,  C23C2/28 ,  C23C2/40 ,  C23C2/06

CPC classification number: C21D8/02 ,  C21D9/46 ,  C22C38/04 ,  C22C38/18 ,  C22C38/60 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C22C38/00 ,  C22C38/004 ,  C22C38/06 ,  C22C38/02 ,  C22C38/001 ,  C22C38/32 ,  C22C38/22 ,  C22C38/54 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D6/002 ,  C23C2/02 ,  C23C2/0224 ,  C23C2/29

公开(公告)号：EP3642376B1

公开(公告)日：2024-08-14

申请号：EP17914710.3

申请日：2017-06-21

IPC: C22C38/24 ,  C22C38/32 ,  C23C4/08 ,  C22C38/02 ,  C22C38/04 ,  C22C38/22 ,  C22C38/36 ,  C22C38/44 ,  C22C38/46 ,  C22C38/54 ,  C22C38/56 ,  B22F1/00 ,  B22F3/115 ,  B22F7/08 ,  B22F3/24 ,  C22C33/02

CPC classification number: C22C38/02 ,  C22C38/04 ,  C22C38/22 ,  C22C38/24 ,  C22C38/32 ,  C22C38/36 ,  C22C38/44 ,  C22C38/46 ,  C22C38/54 ,  C22C38/56 ,  C22C33/0257 ,  C22C33/0271 ,  C22C33/0285 ,  B22F7/08 ,  B22F3/115 ,  B22F2202/1320130101 ,  B22F2999/0020130101 ,  B22F2998/1020130101 ,  B22F2003/24220130101 ,  B22F1/05 ,  C23C4/08 ,  C23C4/131

公开(公告)号：EP4403664A1

公开(公告)日：2024-07-24

申请号：EP24152095.6

申请日：2024-01-16

Applicant: Daido Steel Co., Ltd.

Inventor： Kudo, Daisuke ,  Takahashi, Nobuyuki ,  Ando, Tomohiro ,  Koyanagi, Yoshihiko

IPC: C22C38/58 ,  C22C38/42 ,  C22C38/44 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C22C38/52 ,  C22C38/46 ,  C22C38/48 ,  C22C38/54 ,  C22C38/50 ,  C22C38/06 ,  C21D6/00 ,  C21D7/13 ,  C21D7/02 ,  C21D1/26 ,  C21D8/00

CPC classification number: C22C38/58 ,  C22C38/42 ,  C22C38/44 ,  C22C38/02 ,  C22C38/04 ,  C22C38/002 ,  C22C38/001 ,  C22C38/52 ,  C22C38/46 ,  C22C38/48 ,  C22C38/54 ,  C22C38/50 ,  C22C38/06 ,  C21D6/004 ,  C21D7/13 ,  C21D7/02 ,  C21D1/26 ,  C21D8/005 ,  C21D2211/00120130101

Abstract: The present invention relates to an austenitic stainless steel for high-pressure hydrogen gas or liquid hydrogen, having a composition consisting of C ≤ 0.20 mass%, 0.10 mass% ≤ Si ≤ 1.00 mass%, 0.10 mass% ≤ Mn ≤ 2.0 mass%, P ≤ 0.050 mass%, S ≤ 0.050 mass%, 2.0 mass% ≤ Cu

公开(公告)号：EP3739080B1

公开(公告)日：2024-05-01

申请号：EP19738459.7

申请日：2019-01-08

IPC: C23C22/34 ,  C22C19/05 ,  C22C38/00 ,  C22C38/58 ,  C23C22/78 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54

CPC classification number: C22C19/05 ,  C22C38/00 ,  C22C38/58 ,  C23C22/34 ,  C23C22/78 ,  C21D2211/00120130101 ,  C22C38/002 ,  C22C38/001 ,  C22C38/005 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/52 ,  Y02E10/46

公开(公告)号：EP2813594B1

公开(公告)日：2018-12-12

申请号：EP13746313.9

申请日：2013-01-24

Applicant: Nippon Steel & Sumitomo Metal Corporation

Inventor： HIRATA, Hiroyuki ,  YOSHIZAWA, Mitsuru ,  OGAWA, Hidenori

IPC: C22C38/00 ,  B23K9/025 ,  B23K9/18 ,  C22C38/06 ,  B32B15/01 ,  F22B37/12 ,  C22C38/02 ,  C22C38/04 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  B23K103/04 ,  B23K101/08

CPC classification number: B23K9/0256 ,  B23K9/18 ,  B23K2101/08 ,  B23K2103/04 ,  B32B15/011 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  F22B37/12

Abstract: A double tube for welded structure comprises an inside tube of a heat resistant ferritic steel and an outside tube of a heat resistant austenitic steel. The inside tube has a chemical composition which comprises specific amounts of C, Si, Mn P, S, Ni + Cu, Cr, Mo + W, V, Nb, Ti, B, Al, N and O with the balance of Fe and impurities. The outside tube has a chemical composition which comprises specific amounts of C, Si, Mn, P, S, Ni, Cr, Al, N and O with the balance of Fe and impurities. A fillet weld zone, which satisfies Formula of [wall thickness of outside tube ‰¥ fusion depth in fillet weld + 0.3 mm], is formed on the outside surface of the double tube, and the wall thicknesses (mm) of the outside tube and inside tube satisfy Formula of [wall thickness of outside tube / (wall thickness of outside tube + wall thickness of inside tube) ‰¤ 0.4]. The double tube is excellent in weld crack resistance. If this double tube is used, a welded structure forming various types of high-temperature equipment can be manufactured by fillet-welding plates, metal fittings, and the like to the outside surface of the tube by means of ordinary submerged arc welding without performing treatment such as preheating, postheating, and cleaning of steel. The inside tube may contain one or more kinds of elements selected from Ca, Mg and REM, and the outside tube may contain one or more kinds of elements selected from Mo, W, Cu, Co, Nb, Ti, V, B, Ca, Mg and REM.