DUPLEX STAINLESS STEEL AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2018/043214

A1

Provided is a duplex stainless steel having excellent corrosion resistance, in which excellent carbon dioxide corrosion resistance, excellent sulfide stress corrosion cracking resistance, and excellent sulfide stress cracking resistance are provided at the same time. The present invention has a composition containing, in terms of mass%, 0.03% or less of C, 1.0% or less of Si, 0.10-1.5% Mn, 0.030% or less of P, 0.005% or less of S, 20.0-30.0% Cr, 5.0-10.0% Ni, 2.0-5.0% Mo, 2.0-6.0% Cu, and less than 0.07% of N, the remainder comprising Fe and unavoidable impurities, and the metallographic structure of the present invention has an austenitic phase that is 20-70% by volume ratio and a ferritic phase that is 30-80% by volume ratio.

JPH03226548	STEEL FOR COLD FORGING
JP2007009325	HIGH STRENGTH STEEL PRODUCT HAVING EXCELLENT LOW TEMPERATURE CRACK RESISTANCE, AND METHOD FOR PRODUCING THE SAME
JP3855479	PRODUCTION OF HIGH TENSILE STRENGTH STEEL EXCELLENT IN TOUGHNESS AND ARRESTABILITY

YOSHIMURA YUSUKE (JP)
OTA HIROKI (JP)
YUGA MASAO (JP)
KAMO YUICHI (JP)
EGUCHI KENICHIRO (JP)

PCT/JP2017/029963

March 08, 2018

August 22, 2017

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JFE STEEL CORP (JP)

C22C38/00; C21D8/10; C21D9/08; C22C38/44; C22C38/60

WO2012111537A1

2012-08-23

JPH1060526A	1998-03-03
CN104694830A	2015-06-10
JPS581062A	1983-01-06
JPH08176742A	1996-07-09
JP2006519313A	2006-08-24
JPH05302150A	1993-11-16
JP2009046759A	2009-03-05
JPS6123713A	1986-02-01
JPH1060526A	1998-03-03
JPH07207337A	1995-08-08
JPS61157626A	1986-07-17
JPH07150244A	1995-06-13

See also references of EP 3508596A4

KUMASAKA Akira et al. (JP)

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