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1. (WO2018043214) DUPLEX STAINLESS STEEL AND METHOD FOR MANUFACTURING SAME

Pub. No.:    WO/2018/043214    International Application No.:    PCT/JP2017/029963
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Wed Aug 23 01:59:59 CEST 2017
IPC: C22C 38/00
C21D 8/10
C21D 9/08
C22C 38/44
C22C 38/60
Applicants: JFE STEEL CORPORATION
JFEスチール株式会社
Inventors: YOSHIMURA Yusuke
吉村 悠佑
OTA Hiroki
太田 裕樹
YUGA Masao
柚賀 正雄
KAMO Yuichi
加茂 祐一
EGUCHI Kenichiro
江口 健一郎
Title: DUPLEX STAINLESS STEEL AND METHOD FOR MANUFACTURING SAME
Abstract:
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.