Title:
DUPLEX STAINLESS STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2024/075761
Kind Code:
A1
Abstract:
Provided is a duplex stainless steel material having excellent whole surface corrosion resistance in a high-temperature, high-pressure, strong acidic corrosive environment, and excellent pitting corrosion resistance in a high-temperature, high-pressure, chloride corrosive environment. The duplex stainless steel material according to the present disclosure has a chemical composition containing, in mass%, 0.050% or less of C, 0.2-1.2% of Si, 0.5-7.0% of Mn, 0.040% or less of P, 0.010% or less of S, 20.0-27.0% of Cr, 4.0-9.0% of Ni, 0.5-5.0% of Mo, 0.0005-0.0100% of As, a total of 0.0005-0.0100% of one or more of Ca and Mg, 0.001-0.050% of sol.Al, 0.40% or less of N, and 0.100% or less of O, with the remainder comprising Fe and impurities, and satisfies relationships (1) and (2). (1) 0.70 < 10000 × As/(Ni + Cu) < 16.00; (2) (Ca + Mg)/O < 1.50
Inventors:
TOMIO AKIKO (JP)
TOMIO YUSAKU (JP)
TOMIO YUSAKU (JP)
Application Number:
PCT/JP2023/036160
Publication Date:
April 11, 2024
Filing Date:
October 04, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/60; C21D8/00
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
Download PDF: