公开(公告)号：US12053811B2

公开(公告)日：2024-08-06

申请号：US18107055

申请日：2023-02-08

Applicant: Kanthal AB

Inventor： Krister Wickman

IPC: C22C38/00 ,  B21C37/12 ,  B23K9/032 ,  B23K26/302 ,  C21D8/10 ,  C21D9/08 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/32 ,  B23K101/06 ,  B23K103/02

CPC classification number: B21C37/122 ,  B23K9/0325 ,  B23K26/302 ,  C21D8/105 ,  C21D9/08 ,  C22C38/00 ,  C22C38/001 ,  C22C38/005 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/32 ,  B23K2101/06 ,  B23K2103/02

Abstract: A high temperature iron-chromium-aluminium (FeCrAl) alloy tube extending along a longitudinal axis, wherein the tube is formed from a continuous strip of a high temperature FeCrAl alloy and comprises a helical welded seam. The high temperature FeCrAl alloy tube is manufactured by feeding a continuous strip of the high temperature FeCrAl alloy toward a tube shaping station, helically winding the strip such that long edges of the strip abut each other and a rotating tube moving forward in a direction parallel to its longitudinal axis is formed, and continuously joining said abutting long edges together in a welding process directly when the tube is formed, whereby a welded tube comprising a helical welded seam is obtained.

公开(公告)号：US12037666B2

公开(公告)日：2024-07-16

申请号：US16965719

申请日：2019-01-22

Applicant: JFE Steel Corporation

Inventor： Kyono Yasuda ,  Tomoyuki Yokota ,  Akihiko Tanizawa ,  Ryuji Muraoka ,  Kazukuni Hase

IPC: C22C38/50 ,  C21D8/10 ,  C21D9/08 ,  C22C38/02 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48

CPC classification number: C22C38/50 ,  C21D8/105 ,  C21D9/08 ,  C22C38/02 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C21D2211/002 ,  C21D2211/005

Abstract: A method for producing a steel material for line pipes including heating a steel having a specific composition to a temperature of 1000° C. to 1200° C.; performing hot rolling such that a cumulative rolling reduction ratio in a non-recrystallization temperature range is 60% or more, a cumulative rolling reduction ratio in a temperature range of (a rolling finish temperature +20° C.) or less is 50% or more, and a rolling finish temperature is the Ar3 transformation point or more and 790° C. or less; subsequently performing accelerated cooling from a temperature of the Ar3 transformation point or more, at a cooling rate of 10° C./s or more, to a cooling stop temperature of 200° C. to 450° C.; and then performing reheating such that the temperature of a surface of the steel plate is 350° C. to 550° C. and the temperature of the center of the steel plate is less than 550° C.

公开(公告)号：US20240191331A1

公开(公告)日：2024-06-13

申请号：US18285695

申请日：2022-03-16

Applicant: JFE Steel Corporation

Inventor： Kenichiro Eguchi ,  Masao Yuga

IPC: C22C38/44 ,  C21D1/18 ,  C21D6/00 ,  C21D8/10 ,  C21D9/08 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42

CPC classification number: C22C38/44 ,  C21D1/18 ,  C21D6/004 ,  C21D8/105 ,  C21D9/085 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008

Abstract: Provided are a stainless steel pipe and a method for manufacturing the same. The stainless steel pipe has a chemical composition containing, by mass %, C: 0.05% or less, Si: 1.0% or less, Mn: 0.10% to 2.0%, P: 0.05% or less, S: less than 0.005%, Cr: 16.0% to 20.0%, Mo: 0.6% to 1.4%, Ni: 3.0% to 5.0%, Al: 0.001% to 0.10%, N: 0.010% to 0.100%, O: 0.01% or less, Cu: 0.3% to 3.5%, and a balance of Fe and incidental impurities, in which predetermined relational expressions are satisfied by Cr, Ni, Mo, W, Cu, and C, a microstructure including, in terms of volume fraction, 45% or more of a tempered martensitic phase, 20% to 40% of a ferrite phase, and 5% to 25% of a retained austenite phase, a yield strength of 758 MPa or higher, and an absorbed energy at a temperature of −10° C. vE−10 of 40 J or more.

公开(公告)号：US12000364B2

公开(公告)日：2024-06-04

申请号：US15121058

申请日：2015-02-23

Applicant: USUI KOKUSAI SANGYO KAISHA, LTD. ,  NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Tatsuya Masuda ,  Tsugumi Yamazaki ,  Taizo Makino ,  Katsunori Nagao ,  Tsutomu Okuyama

IPC: C22C38/02 ,  C21D8/10 ,  C21D9/08 ,  C21D9/14 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  F02M55/02 ,  C21D7/10

CPC classification number: F02M55/02 ,  C21D8/10 ,  C21D8/105 ,  C21D9/14 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C21D7/10 ,  C21D9/08 ,  C21D2211/002 ,  C21D2211/008 ,  F02M2200/9061

Abstract: A steel pipe has a composition consisting, by mass percent, of, C: 0.12 to 0.27%, Si: 0.05 to 0.40%, Mn: 0.3 to 2.0%, Al: 0.005 to 0.060%, N: 0.0020 to 0.0080%, Ti: 0.005 to 0.015%, Nb: 0.015 to 0.045%, Cr 0 to 1.0%, Mo: 0 to 1.0%, Cu: 0 to 0.5%, Ni: 0 to 0.5%, V: 0 to 0.15%, and B: 0 to 0.005%, the balance being Fe and impurities. As impurities, contents are Ca: 0.001% or less, P: 0.02% or less, S: 0.01% or less, and O: 0.0040% or less. The micro-structure is tempered martensitic or tempered martensite and tempered bainite, in which a prior-austenite grain size number is 10.0 or more. Tensile strength is TS 800 MPa or higher. Critical internal pressure is [0.3′TS′a] or more, a=[(D/d)2−1]/[0.776′(D/d)2], D: pipe outer diameter (mm), d: pipe inner diameter (mm).

公开(公告)号：US20240133490A1

公开(公告)日：2024-04-25

申请号：US18547172

申请日：2022-02-25

Applicant: BAOSHAN IRON & STEEL CO., LTD.

Inventor： Wen SUN ,  Yaoheng LIU ,  Zhonghua ZHANG ,  Ping HU ,  Yannan MA

IPC: F16L9/02 ,  C21D1/84 ,  C21D6/00 ,  C21D8/10 ,  C21D9/08 ,  C22C33/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12

CPC classification number: F16L9/02 ,  C21D1/84 ,  C21D6/005 ,  C21D6/008 ,  C21D8/105 ,  C21D9/085 ,  C22C33/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C21D2211/002

Abstract: The present disclosure provides a bainite geological drilling pipe, comprising the following chemical elements in percentage by mass: 0.14-0.22% of C, 0.2-0.55% of Si, 2.1-2.9% of Mn, 0.01-0.04% of Nb, 0.015-0.04% of Al, 0.001-0.005% of B, 0

公开(公告)号：US20240124949A1

公开(公告)日：2024-04-18

申请号：US18273370

申请日：2022-01-26

Applicant: JFE Steel Corporation

Inventor： Kenichiro Eguchi ,  Masao Yuga

IPC: C21D9/08 ,  C21D8/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/52 ,  C22C38/58 ,  C22C38/60

CPC classification number: C21D9/085 ,  C21D8/105 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/52 ,  C22C38/58 ,  C22C38/60 ,  C21D2211/001

Abstract: A high-strength stainless steel seamless pipe for oil country tubular goods has a composition that contains, in mass %, C: 0.012 to 0.05%, Si: 0.05 to 0.50%, Mn: 0.04 to 1.80%, P: 0.030% or less, S: 0.005% or less, Cr: 11.0 to 14.0%, Ni: 0.5 to 6.5%, Mo: 0.5 to 3.0%, Al: 0.005 to 0.10%, V: 0.005 to 0.20%, Co: 0.01 to 0.3%, N: 0.002 to 0.15%, O: 0.010% or less, and Ti: 0.001 to 0.20%, and in which Cr, Ni, Mo, Cu, C, Si, Mn, N, and Ti satisfy predetermined relations, and the balance is Fe and incidental impurities, the high-strength stainless steel seamless pipe having a steel microstructure with 6 to 20% retained austenite in terms of a volume percentage, a yield strength of 758 MPa or more, and an absorption energy vE−60 at −60° C. of 70 J or more.

公开(公告)号：US20240093323A1

公开(公告)日：2024-03-21

申请号：US18254942

申请日：2021-11-30

Applicant: DALMINE S.P.A.

Inventor： PAOLO BORTOT ,  MATTEO ORTOLANI ,  GIANLUCA BASSANINI ,  MICHELE SILEO ,  ERICK ARTURO ESCORZA MARQUEZ

IPC: C21D9/14 ,  C21D1/18 ,  C21D6/00 ,  C21D8/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/60

CPC classification number: C21D9/14 ,  C21D1/18 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/105 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/60 ,  C21D2211/008

Abstract: A steel composition includes, in wt. %:



C: 0.25-0.35;
Si: 0.20-0.35;
Mn: 0.40-0.60;
Cr: 1.20-1.70;
Ni: 1.40-1.90;
Mo: 0.15-0.25;
Al: 0.015-0.035;
Nb: 0.001-0.040;
V: 0.001-0.060;
N: 0.0030-0.0120;
Ca: 0.0010-0.0030; and
Fe.

The wrought article made from this composition has a balanced set of mechanical properties including strength, ductility and toughness including resistance to fatigue crack propagation.

公开(公告)号：US20230392241A1

公开(公告)日：2023-12-07

申请号：US18245773

申请日：2021-10-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Daisuke MATSUO ,  Yusaku TOMIO

IPC: C22C38/44 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/08 ,  C21D8/10 ,  C21D6/00

CPC classification number: C22C38/44 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/005 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21D9/085 ,  C21D8/105 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D2211/008

Abstract: A martensitic stainless steel material according to the present disclosure contains, in mass %, C: 0.030% or less, Ni: 5.05 to 7.50%, Cr: 10.00 to 14.00%, and Mo: 1.50 to 3.50%, and has a yield strength of 758 MPa or more, and on two line segments LS of 1000 μm extending in a wall thickness direction with arbitrary two points as a center located at positions at a depth of 2 mm from the inner surface, a degree of Cr segregation ΔCr defined by Formula (1) and a degree of Mo segregation ΔMo defined by Formula (2) satisfy Formula (3):


ΔCr=([Cr*]max−[Cr*]min)/[Cr*]ave  (1)



ΔMo=([Mo*]max−[Mo*]min)/[Mo*]ave  (2)



ΔCr+ΔMo≤0.59  (3).

公开(公告)号：US11827949B2

公开(公告)日：2023-11-28

申请号：US16646347

申请日：2018-09-04

Applicant: JFE Steel Corporation

Inventor： Mami Endo ,  Masao Yuga ,  Yuichi Kamo

IPC: C21D9/14 ,  C21D8/10 ,  C21D6/00 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D9/14 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/105 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C21D2211/008

Abstract: The invention provides a martensitic stainless steel seamless pipe for oil country tubular goods having high strength, and excellent sulfide stress corrosion cracking resistance and a method for manufacturing the same. The martensitic stainless steel seamless pipe for oil country tubular goods has a yield stress of 655 to 758 MPa, and has a composition containing, in mass %, C: 0.10% or less, Si: 0.5% or less, Mn: 0.05 to 2.0%, P: 0.030% or less, S: 0.005% or less, Ni: 4.0 to 8.0%, Cu: 0.02% or more and less than 1.0%, Cr: 10.0 to 14.0%, Mo: 1.0 to 3.5%, V: 0.003 to 0.2%, Co: 0.02% or more and less than 1.0%, Al: 0.1% or less, N: 0.1% or less, Ti: 0.50% or less, and the balance Fe and incidental impurities, wherein C, Mn, Cr, Cu, Co, Ni, Mo, W, Nb, N, and Ti satisfy the predetermined relations.

公开(公告)号：US11821051B2

公开(公告)日：2023-11-21

申请号：US16708997

申请日：2019-12-10

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke Sasaki ,  Tatsuro Katsumura ,  Hiroki Ushida ,  Yasushi Kato

IPC: B21B17/04 ,  C21D9/08 ,  B21B3/02 ,  B21B17/08 ,  B21B19/04 ,  C22C38/00 ,  C22C38/58 ,  B21B45/02 ,  C21D8/10 ,  B21B45/00 ,  C21D6/00 ,  C22C30/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC classification number: C21D9/085 ,  B21B3/02 ,  B21B17/08 ,  B21B19/04 ,  B21B45/004 ,  B21B45/02 ,  B21B45/0209 ,  B21B45/0215 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/10 ,  C21D8/105 ,  C21D9/08 ,  C22C30/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  B21B2045/0227 ,  C21D2211/001 ,  C21D2211/005

Abstract: An apparatus line for manufacturing seamless steel pipes and tubes includes: a heating apparatus for heating a steel raw material; a piercing apparatus for piercing the heated steel raw material thus forming a hollow material; and a rolling apparatus for applying working to the hollow material to form a seamless steel pipe having a predetermined shape. A cooling apparatus is arranged on an exit side of the rolling apparatus. A heated steel raw material is worked by the rolling apparatus after being pierced by the piercing apparatus, and thereafter, using a surface temperature of a hollow piece before being cooled by the cooling apparatus as a cooling start temperature, the hollow piece is cooled to a cooling stop temperature differing by 50° C. or more from the cooling start temperature and being equal to or above 600° C. at an average cooling speed of 1.0° C./s or more in terms of an outer surface temperature.