AUSTENITIC STAINLESS STEEL

WIPO Patent Application WO/2023/210959

A1

An austenitic stainless steel according to an embodiment of the present invention comprises, by wt%, 0.04-0.07% of C, 0.3-0.6% of Si, 0.5-1.5% of Mn, 0.1-0.4% of Cu, 0.05-0.2% of Mo, 8.0-9.0% of Ni, 18.0-19.0% of Cr, 0.02-0.05% of N, and the remainder of Fe and inevitable impurities, wherein the thickness of the austenitic stainless steel is 0.4-2.0 mm, the average grain size (d) at a central portion in the thickness direction is 3-10 μm, the martensite fraction after cold rolling is 60% or more, the fraction at a misorientation angle of 15° or more after cold annealing is 95% or more, the pitting potential value is 250 mV or more, the surface roughness (Ra) when stretched by 30% is 0.50 μm or less, the surface roughness (Ra) when stretched by 20% is 0.36 μm or less, the surface roughness (Ra) when stretched by 10% is 0.25 μm or less, the aging crack limiting drawing ratio during a drawing process is 2.0 or more, the average earring height is 2.2 mm or less, and bending cracks may not occur after a 180° bending test.

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KIM SANGSEOK (KR)
PARK MINAM (KR)
JUNG ILCHAN (KR)
KWON YONGMIN (KR)

PCT/KR2023/003278

November 02, 2023

March 10, 2023

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POSCO CO LTD (KR)

C22C38/44; C21D8/02; C21D9/46; C22C38/00

KR20210052502A	2021-05-10
JP2021188081A	2021-12-13
KR20220030722A	2022-03-11
KR20100058850A	2010-06-04
US5571343A	1996-11-05

SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)

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