Title:
DUPLEX STAINLESS STEEL PIPE AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2022/196196
Kind Code:
A1
Abstract:
Provided are a high-strength duplex stainless steel pipe having an excellent wear resistance or dent resistance on the inner and outer surfaces of a steel pipe, and a method for manufacturing the same. The present invention has a component composition containing, by mass, 0.005 to 0.150% of C, 1.0% or less of Si, 10.0% or less of Mn, 11.5 to 35.0% of Cr, 0.5 to 15.0% of Ni, 0.5 to 6.0% of Mo, and less than 0.400% of N, with the remainder made up by Fe and unavoidable impurities, and has a steel structure having a ferrite phase and an austenite phase. The pipe axial direction tensile yield strength is 689 MPa or above, and the present invention has, on the steel pipe outer surface and the steel pipe inner surface, an oxide layer having a thickness of 1.0 μm or above.
Inventors:
SASAKI SHUNSUKE (JP)
GOTO SEIGO (JP)
YUGA MASAO (JP)
KATSUMURA TATSURO (JP)
KIJIMA HIDEO (JP)
GOTO SEIGO (JP)
YUGA MASAO (JP)
KATSUMURA TATSURO (JP)
KIJIMA HIDEO (JP)
Application Number:
PCT/JP2022/005176
Publication Date:
September 22, 2022
Filing Date:
February 09, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D7/10; C21D9/08; C22C38/00; C22C38/58; C22C38/60
Domestic Patent References:
| WO2020044988A1 | 2020-03-05 | |||
| WO2018003941A1 | 2018-01-04 |
Foreign References:
| JPH1180904A | 1999-03-26 | |||
| JP2017020105A | 2017-01-26 | |||
| JP2016191149A | 2016-11-10 | |||
| JPS57194213A | 1982-11-29 | |||
| JPS6415323A | 1989-01-19 | |||
| JPS63290616A | 1988-11-28 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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