公开(公告)号：US12188110B2

公开(公告)日：2025-01-07

申请号：US17596474

申请日：2020-08-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji Yoshida ,  Yuji Arai ,  Kuniaki Itoh ,  Takuya Okamura

IPC: C22C38/42 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/54

Abstract: The steel material according to the present disclosure has a chemical composition consisting of, in mass %, C: more than 0.20 to 0.35%, Si: 0.05 to 1.00%, Mn: 0.02 to 1.00%, P: 0.025% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr: 0.40 to 1.50%, Mo: 0.30 to 1.50%, Ti: 0.002 to 0.050%, B: 0.0001 to 0.0050%, N: 0.0100% or less and O: 0.0100% or less, with the balance being Fe and impurities, and satisfies Formula (1) and Formula (2) described in the description. The yield strength is 862 MPa or more. A numerical proportion of precipitates having an equivalent circular diameter within a range of 20 to 300 nm among precipitates having an equivalent circular diameter of 20 nm or more in the steel material is 0.85 or more.

公开(公告)号：US11898216B2

公开(公告)日：2024-02-13

申请号：US16981435

申请日：2019-03-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroki Kamitani ,  Takanori Tanaka ,  Atsushi Soma ,  Keiichi Kondo ,  Hideki Mitsunari ,  Seiya Okada ,  Takuya Matsumoto ,  Shinji Yoshida ,  Yuji Arai

IPC: C21D9/08 ,  B21D41/04 ,  C21D8/10

CPC classification number: C21D9/085 ,  B21D41/04 ,  C21D8/105

Abstract: A seamless steel pipe heat-treatment-finishing-treatment continuous facility includes: a heat treatment apparatus; a steel pipe inspection apparatus which performs a test for a surface defect and/or an inner defect of the seamless steel pipe, the steel pipe inspection apparatus being disposed downstream of the heat treatment apparatus; a main transfer mechanism which forms a main transfer path MT for transferring the seamless steel pipe, discharged from the heat treatment apparatus, to the steel pipe inspection apparatus disposed downstream of the heat treatment apparatus; and a first forced steel pipe-temperature reduction apparatus which forcibly reduces a temperature of the seamless steel pipe on the main transfer path MT, the first forced steel pipe-temperature reduction apparatus being disposed on the main transfer path MT at a position downstream of the heat treatment apparatus and upstream of the steel pipe inspection apparatus.

公开(公告)号：US11078558B2

公开(公告)日：2021-08-03

申请号：US16339577

申请日：2017-10-06

Applicant: Nippon Steel Corporation

Inventor： Yuji Arai ,  Shinji Yoshida ,  Atsushi Soma ,  Hiroki Kamitani

IPC: C22C38/42 ,  C21D7/13 ,  C21D9/08 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C21D1/18

Abstract: The steel material according to the present invention contains a chemical composition consisting of, in mass %, C: 0.25 to 0.50%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.00%, P: 0.025% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr: 0.30 to 1.50%, Mo: 0.25 to 1.50%, Ti: 0.002 to 0.050%, B: 0.0001 to 0.0050%, N: 0.002 to 0.010% and O: 0.0100% or less, with the balance being Fe and impurities. The steel material also contains an amount of dissolved C within a range of 0.010 to 0.050 mass%. The steel material also contains an yield strength is in a range of 862 to less than 965 MPa, and an yield ratio is 90% or more.

公开(公告)号：US11492688B2

公开(公告)日：2022-11-08

申请号：US17253229

申请日：2019-09-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji Yoshida ,  Yuji Arai

IPC: C22C38/32 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/28 ,  C21D8/10

Abstract: The steel material according to the present disclosure has a chemical composition consisting of, in mass %, C: 0.20 to 0.35%, Si: 0.05 to 1.00%, Mn: 0.01 to 1.00%, P: 0.025% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr 0.25 to 0.80%, Mo: 0.20 to 2.00%, Ti: 0.002 to 0.050%, B: 0.0001 to 0.0050%, N: 0.0020 to 0.0100% and O: 0.0100% or less, with the balance being Fe and impurities, and satisfying Formula (1). A number density of precipitates having an equivalent circular diameter of 400 nm or more is 0.150 particles/μm2 or less. The yield strength is within a range of 655 to 965 MPa. A dislocation density ρ is 7.0×1014 m−2 or less. 5×Cr—Mo-2×(V+Ti)≤3.00  (1)

公开(公告)号：US11434554B2

公开(公告)日：2022-09-06

申请号：US17044616

申请日：2019-03-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroki Kamitani ,  Atsushi Soma ,  Keiichi Kondo ,  Shinji Yoshida ,  Yuji Arai

IPC: C22C38/32 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28

Abstract: The steel material according to the present disclosure contains a chemical composition consisting of, in mass %, C: 0.20 to 0.50%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.00%, P: 0.030% or less, S: less than 0.0050%, Al: 0.005 to 0.050%, Cr: 0.10 to 1.50%, Mo: 0.25 to 1.80%, Ti: 0.002 to 0.050%, Nb: 0.002 to 0.100%, B: 0.0001 to 0.0050%, N: 0.0070% or less and O: less than 0.0050% with the balance being Fe and impurities. A yield strength is within a range of 655 to 1069 MPa, and a yield ratio is 85% or more. A proportion of KAM values of 1° or less is 30 area % or more.

公开(公告)号：US11174539B2

公开(公告)日：2021-11-16

申请号：US16980671

申请日：2019-03-25

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroki Kamitani ,  Atsushi Soma ,  Shinji Yoshida ,  Yuji Arai ,  Seiya Okada

IPC: C22C38/00 ,  C22C38/54 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/42 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52

Abstract: The steel material according to the present disclosure contains a chemical composition consisting of, in mass %, C: 0.20 to 0.50%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.00%, P: 0.030% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr: 0.10 to 1.50%, Mo: 0.25 to 1.50%, Ti: 0.002 to 0.050%, N: 0.0100% or less and O: 0.0100% or less, with the balance being Fe and impurities. The steel material contains an amount of dissolved C within a range of 0.010 to 0.050 mass %. The steel material also has a yield strength within a range of 655 to less than 862 MPa, and a yield ratio of the steel material is 85% or more.

公开(公告)号：US11473177B2

公开(公告)日：2022-10-18

申请号：US16975318

申请日：2019-02-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji Yoshida ,  Yuji Arai

IPC: C22C38/14 ,  C22C38/02 ,  C22C38/04 ,  C22C38/20 ,  C22C38/32 ,  C22C38/28 ,  C22C38/24 ,  C21D9/08

Abstract: The steel material according to the present disclosure has a chemical composition consisting of, in mass %, C: 0.10 to 0.60%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.025% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr: 0.20 to 1.50%, Mo: 0.25 to 1.50%, V: 0.01 to 0.60%, Ti: 0.002 to 0.050%, B: 0.0001 to 0.0050%, N: 0.0020 to 0.0100%, and O: 0.0100% or less, with the balance being Fe and impurities. A dislocation density ρ is 3.5×1015 m−2 or less. Among fine precipitates, the numerical proportion of precipitates for which a ratio of the Mo content is not more than 50% is 15% or more. The yield strength is in a range of 655 to 1172 MPa.

公开(公告)号：US11332813B2

公开(公告)日：2022-05-17

申请号：US17043096

申请日：2019-03-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji Yoshida ,  Yuji Arai ,  Atsushi Soma ,  Hiroki Kamitani

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/32 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/20 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30

Abstract: The steel material according to the present disclosure contains a chemical composition consisting of, in mass %, C: more than 0.50 to 0.80%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.025% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr: 0.20 to 1.50%, Mo: 0.25 to 1.50%, Ti: 0.002 to 0.050%, B: 0.0001 to 0.0050%, N: 0.0100% or less and O: 0.0100% or less, with the balance being Fe and impurities. The steel material contains an amount of dissolved C within a range of 0.010 to 0.060 mass %. The steel material also has a yield strength within a range of 862 to less than 965 MPa, and a yield ratio of the steel material is 90% or more.

公开(公告)号：US12054798B2

公开(公告)日：2024-08-06

申请号：US17265614

申请日：2019-10-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuji Arai ,  Shinji Yoshida ,  Hiroki Kamitani ,  Yohei Otome

IPC: C21D8/10 ,  C21D6/00 ,  C21D9/00 ,  C21D9/08 ,  C22C38/00 ,  C22C38/44 ,  C22C38/46 ,  C22C38/54

CPC classification number: C21D8/105 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D9/085 ,  C22C38/001 ,  C22C38/44 ,  C22C38/46 ,  C22C38/54

Abstract: The steel material according to the present disclosure has a chemical composition consisting of, in mass %, C: 0.15 to 0.45%, Si: 0.05 to 1.00%, Mn: 0.01 to 1.00%, P: 0.030% or less, S: 0.0050% or less, Al: 0.005 to 0.100%, Cr 0.60 to 1.80%, Mo: 0.80 to 2.30%, Ti: 0.002 to 0.020%, V: 0.05 to 0.30%, Nb: 0.002 to 0.100%, B: 0.0005 to 0.0040%, Cu: 0.01 to 0.50%, Ni: 0.01 to 0.50%, N: 0.0020 to 0.0100% and O: 0.0020% or less, with the balance being Fe and impurities. The number density of BN in the steel material is 10 to 100 particles/100 μm2. The yield strength of the steel material is 758 MPa or more.

公开(公告)号：US11905580B2

公开(公告)日：2024-02-20

申请号：US17259651

申请日：2019-09-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroki Kamitani ,  Nobuaki Komatsubara ,  Seiya Okada ,  Atsushi Soma ,  Yuji Arai ,  Shinji Yoshida

IPC: C22C38/32 ,  C21D9/08 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28

CPC classification number: C22C38/32 ,  C21D9/085 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28

Abstract: The seamless steel pipe according to the present disclosure has a chemical composition consisting of, in mass %, C: 0.15 to 0.45%, Si: 0.05 to 1.00%, Mn: 0.01 to 1.00%, P: 0.030% or less, S: 0.0050% or less, Al: 0.005 to 0.070%, Cr: 0.30 to 1.50%, Mo: 0.25 to 2.00%, Ti: 0.002 to 0.020%, Nb: 0.002 to 0.100%, B: 0.0005 to 0.0040%, rare earth metal: 0.0001 to 0.0015%, Ca: 0.0001 to 0.0100%, N: 0.0100% or less and O: 0.0020% or less, with the balance being Fe and impurities, and satisfying Formula (1) described in the description. A predicted maximum major axis of inclusions is 150 μm or less, the predicted maximum major axis being predicted by means of extreme value statistical processing. The yield strength is within a range of 758 to 862 MPa.