AUSTENITIC STAINLESS STEEL SHEET, METHOD FOR PRODUCING SAME, AND COMPONENT

WIPO Patent Application WO/2024/096114

A1

The present invention provides an austenitic stainless steel sheet in which intergranular cracking is suppressed (nitriding resistance) and the occurrence of red scale is suppressed (oxidation resistance) even in gas atmospheres containing nitrogen and water vapor, as do ammonia combustion gases, in the mid- to high-temperature range of 500-700°C.　An austenitic stainless steel sheet according to the present invention has a prescribed component composition for which the below nitriding trend index is 15 or less. An Si oxide film is present on the steel sheet surface at a surface ratio of 5% or more. It is possible to obtain said steel sheet by forming an internal oxidation layer (Si oxide layer) by subjecting the steel sheet to final annealing, then removing the Cr oxide layer and the Fe oxide layer of the surface layer during acid pickling, and forming an Si oxide layer on the surface layer.　Nitriding trend index = 0.5Cr+10Al+2Mo+3Ti+0.5Cu-1.5Si

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FUJIMURA YOSHITOMO (JP)
HAMADA JUN-ICHI (JP)

PCT/JP2023/039688

May 10, 2024

November 02, 2023

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NIPPON STEEL STAINLESS STEEL CORP (JP)

C22C38/00; C21D9/46; C22C38/60; C23G1/08

WO2022085788A1	2022-04-28
WO2018181257A1	2018-10-04

JP2022155181A	2022-10-13
JP2019059995A	2019-04-18

AOKI, Atsushi et al. (JP)

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