DUPLEX STAINLESS STEEL AND METHOD FOR PRODUCING SAME

Title:

DUPLEX STAINLESS STEEL AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2018/131412

Kind Code:

A1

Abstract:

Provided is a duplex stainless steel having excellent corrosion resistance, which has excellent carbon dioxide gas corrosion resistance, excellent sulfide stress corrosion cracking resistance and excellent sulfide stress cracking resistance at the same time. This duplex stainless steel has a composition which contains, in mass%, 0.03% or less of C, 1.0% or less of Si, 0.10-1.5% of Mn, 0.030% or less of P, 0.005% or less of S, 20.0-30.0% of Cr, 5.0-10.0% of Ni, 2.0-5.0% of Mo, 2.0-6.0% of Cu, less than 0.07% of N, and one or more elements selected from among 0.05-1.0% of Al, 0.02-1.0% of Ti and 0.02-1.0% of Nb, with the balance made up of Fe and unavoidable impurities. This duplex stainless steel has a structure that comprises, in volume percentage, 20-70% of an austenite phase and 30-80% of a ferrite phase.

Inventors:

EGUCHI KENICHIRO (JP)
YUGA MASAO (JP)

Application Number:

PCT/JP2017/045748

Publication Date:

July 19, 2018

Filing Date:

December 20, 2017

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/00; C21D6/00; C21D8/10; C21D9/08; C22C38/50; C22C38/60

Domestic Patent References:

WO2016162525A1

2016-10-13

Foreign References:

JPS50105504A	1975-08-20
JP2016117944A	2016-06-30
JP2016216816A	2016-12-22
JPH07207337A	1995-08-08
JP2004315870A	2004-11-11
EP3112492A1	2017-01-04
JPH05302150A	1993-11-16
JP2009046759A	2009-03-05
JPS6123713A	1986-02-01
JPH1060526A	1998-03-03
JPH07207337A	1995-08-08
JPS61157626A	1986-07-17

Other References: