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Title:
DUPLEX STAINLESS STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2023/054599
Kind Code:
A1
Abstract:
Provided is a duplex stainless steel pipe having high yield strength and excellent machinability. The duplex stainless steel pipe of the present disclosure is composed of, by mass%, C: 0.030% or less, Si: 1.00% or less, Mn: 0.10-7.00%, P: 0.040% or less, S: 0.0050% or less, Cr: 20.0-30.0%, Ni: 4.2-10.0%, Mo: 0.5-5.0%, Cu: 0.5-6.0%, N: less than 0.350%, O: 0.0005-0.0100%, and Ca: 0.0005-0.0100%, with the remainder being Fe and impurities. The microstructure is composed of 30-80% ferrite by volume ratio, with the remainder being austenite. The yield strength is 552 MPa or greater. The number density of a Ca oxide having an equivalent circle diameter of 2.0 μm or greater is not less than 500 per 100 mm2.

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Inventors:
OKADA SEIYA (JP)
ARAI YUJI (JP)
MATSUO DAISUKE (JP)
Application Number:
PCT/JP2022/036483
Publication Date:
April 06, 2023
Filing Date:
September 29, 2022
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21C7/00; C21D8/10; C21D9/08; C22C30/04; C22C38/00; C22C38/60
Foreign References:
JP2019077925A2019-05-23
JP2019073789A2019-05-16
CN100999806A2007-07-18
JPH05132741A1993-05-28
JPH09195003A1997-07-29
JP2014043616A2014-03-13
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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