FERRITIC STAINLESS STEEL SHEET, PRODUCTION METHOD THEREFOR, AND PARTS

WIPO Patent Application WO/2024/096109

A1

The present invention provides a ferritic stainless steel sheet in which intergranular cracking is inhibited (nitrification resistance), and a red scale is inhibited from occurring (oxidation resistance), in a moderate- to high-temperature region of 500-700°C, even in a gas atmosphere containing nitrogen and water vapor, such as ammonia combustion gas.　The ferritic stainless steel sheet according to the present invention has a predetermined component composition having a nitrification tendency factor, described below, of at most five. In addition, a Si oxide film is provided on a surface of the steel sheet at an area ratio of at least 5%. The steel sheet can be obtained by subjecting a steel sheet to finishing-annealing to form an internal oxide layer (Si oxide layer), subsequently performing acid cleaning to remove a Cr oxide layer and an Fe oxide layer from a surface layer, and forming a Si oxide layer in the surface layer.　Nitrification tendency factor = 10Al + 2Mo + 3Ti + 0.5Cu - 1.5Si

JPS6213535	MANUFACTURE OF HIGH TENSION STEEL PLATE
JP3927420	CASE HARDENING STEEL SUPERIOR IN TEMPER SOFTENING RESISTANCE
JP2010265488	METHOD FOR PRODUCING RARE EARTH-TRANSITION METAL-NITROGEN-BASED MAGNET POWDER, RARE EARTH-TRANSITION METAL-NITROGEN-BASED MAGNET POWDER OBTAINED THEREBY, COMPOSITION FOR BOND MAGNET USING THE SAME, AND BOND MAGNET

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

PCT/JP2023/039683

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

AOKI, Atsushi et al. (JP)

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