DUPLEX STAINLESS STEEL MATERIAL

WIPO Patent Application WO/2024/043259

A1

The present invention provides a duplex stainless steel material which has excellent intergranular corrosion resistance. A duplex stainless steel material according to the present disclosure is composed of, in mass%, 0.030% or less of C, 0.50% or less of Si, 2.00% or less of Mn, 0.040% or less of P, 0.0010% or less of S, 26.0% to 28.0% of Cr, 6.0% to 10.0% of Ni, 0.20% to 1.70% of Mo, more than 2.00% but not more than 3.00% of W, more than 0.30% but not more than 0.40% of N, 0.020% or less of O and 0.050% or less of Al, with the balance being made up or Fe and impurities; and if the longitudinal direction and the thickness direction of three rectangular regions thereof are respectively defined as direction L and direction T, and five line segments that divide each region into six equal parts in direction L are defined as line segments LS, the average thickness TF of ferrites overlapping with 15 line segments LS is 2.50 µm to 4.50 µm, the sample standard deviation ∆TF of the ferrite thickness is 0.50 µm or less, and the average thickness TA of austenites overlapping with the line segments LS is 2.50 µm to 4.50 µm.

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YAMADA KENTA (JP)
OSUKI TAKAHIRO (JP)
KURIHARA SHINNOSUKE (JP)
AOTA SHOHGO (JP)
NAGASHIMA EIKI (JP)
ISHIKAWA DAI (JP)

PCT/JP2023/030249

February 29, 2024

August 23, 2023

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NIPPON STEEL CORP (JP)
TOYO ENGINEERING CORP (JP)

C22C38/00; C21D8/00; C21D9/08; C22C38/58

WO2021225103A1	2021-11-11
WO2020218426A1	2020-10-29

JP2003301241A	2003-10-24
JP2011127186A	2011-06-30
JP2007146202A	2007-06-14

ASCEND IP LAW FIRM (JP)

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