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1. (WO2018043565) AUSTENITIC STAINLESS STEEL

Pub. No.:    WO/2018/043565    International Application No.:    PCT/JP2017/031157
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Thu Aug 31 01:59:59 CEST 2017
IPC: C22C 38/00
C22C 38/58
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION
新日鐵住金株式会社
Inventors: OKADA, Hirokazu
岡田 浩一
KURIHARA, Shinnosuke
栗原 伸之佑
DAN, Etsuo
旦 越雄
SETO, Masahiro
瀬戸 雅浩
OSUKI, Takahiro
小薄 孝裕
Title: AUSTENITIC STAINLESS STEEL
Abstract:
Provided is an austenitic stainless steel which exhibits excellent polythionic acid SCC resistance and excellent creep ductility. An austenitic stainless steel according to the present embodiment has a chemical composition which contains, in terms of mass%, 0.030% or less of C, 0.10-1.00% of Si, 0.20-2.00% of Mn, 0.040% or less of P, 0.010% or less of S, 16.0-25.0% of Cr, 10.0-30.0% of Ni, 0.1-5.0% of Mo, 0.20-1.00% of Nb, 0.050-0.300% of N, 0.0005-0.100% of sol.Al and 0.0010-0.0080% of B, with the remainder comprising Fe and impurities, and which satisfies formula (1). B+0.004-0.9C+0.017Mo2 ≥ 0 (1) Here, the atomic symbols in formula (1) are substituted by the content (mass%) of the corresponding element.