Title:
ねじ付き鋼管およびその製造方法
Document Type and Number:
Japanese Patent JP7255752
Kind Code:
B2
Abstract:
To alleviate stress exerted on a thread portion of a threaded steel pipe or tube during use to prevent fatigue fracture, there is provided a threaded steel pipe or tube having a female thread portion on an inner peripheral surface of at least one end, wherein a maximum value of residual compressive stress at a position of 0.4 mm in a depth direction from a thread bottom of the female thread portion is 100 MPa or more and less than or equal to tensile strength of a material of the threaded steel pipe or tube.
Inventors:
Takushi Okano
Kazuki Matsubara
▲高▼木 周作
Nobuyuki Ishikawa
Kazuki Matsubara
▲高▼木 周作
Nobuyuki Ishikawa
Application Number:
JP2022515608A
Publication Date:
April 11, 2023
Filing Date:
November 02, 2021
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
F17C1/00; F16J12/00; F16J13/12; F17C1/10
Domestic Patent References:
| JP2019044967A | ||||
| JP2018009683A | ||||
| JP2016089891A | ||||
| JP2019082188A | ||||
| JP2019113121A | ||||
| JP2004052857A |
Foreign References:
| KR1020190128767A |
Attorney, Agent or Firm:
Kenji Sugimura
Mitsutsugu Sugimura
Keisuke Kawahara
Nobuyuki Ichieda
Mitsutsugu Sugimura
Keisuke Kawahara
Nobuyuki Ichieda