Title:
STAINLESS SEAMLESS STEEL PIPE AND METHOD FOR PRODUCING STAINLESS SEAMLESS STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2021/187331
Kind Code:
A1
Abstract:
Provided are a stainless seamless steel pipe and a method for producing a stainless seamless steel pipe. This stainless seamless steel pipe has a component composition which contains, in mass%, no more than 0.06% C, no more than 1.0% Si, 0.01% to 1.0% Mn, no more than 0.05% P, no more than 0.005% S, 15.2% to 18.5% Cr, 1.5% to 4.3% Mo, 1.1% to 3.5% Cu, 3.0% to 6.5% Ni, no more than 0.10% Al, no more than 0.10% N, no more than 0.010% O, and 0.001% to 1.000% Sb, with C, Si, Mn, Cr, Ni, Mo, Cu, and N satisfying a prescribed formula and the remainder of the composition comprising Fe and unavoidable impurities. The stainless seamless steel pipe has a structure containing, in volume ratio, at least 30% of a martensite phase, no more than 65% of a ferrite phase, and no more than 40% of a retained austenite phase, and the yield strength of the steel pipe is at least 758 MPa.
Inventors:
KAMO YUICHI (JP)
YUGA MASAO (JP)
YUGA MASAO (JP)
Application Number:
PCT/JP2021/009892
Publication Date:
September 23, 2021
Filing Date:
March 11, 2021
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D9/08; C22C38/00; C22C38/60
Domestic Patent References:
| WO2019035329A1 | 2019-02-21 | |||
| WO2018155041A1 | 2018-08-30 | |||
| WO2018020886A1 | 2018-02-01 |
Foreign References:
| JP2015110822A | 2015-06-18 | |||
| CN102534418A | 2012-07-04 | |||
| JPS4415054B1 | 1969-07-04 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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