公开(公告)号：US20230055650A1

公开(公告)日：2023-02-23

申请号：US17787397

申请日：2020-11-24

Applicant: JFE Steel Corporation

Inventor： Mitsuhiro Okatsu ,  Masao Yuga ,  Toshiharu Hirama

IPC: C21D9/08 ,  F16L9/02 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/10 ,  C21D6/00

Abstract: Provided herein is a high-strength seamless steel pipe, and a method for manufacturing same. A high-strength seamless steel pipe of the present invention has a yield strength of 758 MPa or more, and a KILIMIT value of 23.0 MPa√m or more as an evaluation index of sulfide stress corrosion cracking resistance.

公开(公告)号：US12227816B2

公开(公告)日：2025-02-18

申请号：US17787397

申请日：2020-11-24

Applicant: JFE Steel Corporation

Inventor： Mitsuhiro Okatsu ,  Masao Yuga ,  Toshiharu Hirama

IPC: C21D9/08 ,  C21D6/00 ,  C21D8/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  F16L9/02

Abstract: Provided herein is a high-strength seamless steel pipe, and a method for manufacturing same. A high-strength seamless steel pipe of the present invention has a yield strength of 758 MPa or more, and a KILIMIT value of 23.0 MPa√m or more as an evaluation index of sulfide stress corrosion cracking resistance.

公开(公告)号：US20230023397A1

公开(公告)日：2023-01-26

申请号：US17787402

申请日：2020-11-24

Applicant: JFE Steel Corporation

Inventor： Mitsuhiro Okatsu ,  Masao Yuga ,  Toshiharu Hirama

IPC: C21D9/08 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/32 ,  C21D8/10

Abstract: Provided herein is a high-strength seamless steel pipe, and a method for manufacturing same. A high-strength seamless steel pipe of the present invention has a steel microstructure with a prior austenite grain size of 11.0 or more in terms of a grain size number in compliance with ASTM E112, and has a yield strength of 862 MPa or more and 965 MPa or less.