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Title:
AUSTENITIC STAINLESS STEEL AND MANUFACTURING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2022/270814
Kind Code:
A1
Abstract:
Disclosed in the present specification are: an austenitic stainless steel free of surface cracks in a bent portion and having excellent surface roughness; and a manufacturing method thereof. The austenitic stainless steel according to an embodiment of the present invention comprises 0.005-0.03 wt% of C, 0.1-1 wt% of Si, 0.1-2 wt% of Mn, 6-12 wt% of Ni, 16-20 wt% of Cr, 0.01-0.2 wt% of N, and at most 0.25 wt% of Nb, with the balance being Fe and unavoidable impurities, wherein the average grain size (d) value at a center portion in the thickness direction is at most 5 μm, and the martensite area fraction measured in the bent portion after a 180° bending test may be at most 10%.

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Inventors:
KIM SANGSEOK (KR)
PARK MINAM (KR)
JO KIHOON (KR)
Application Number:
PCT/KR2022/008454
Publication Date:
December 29, 2022
Filing Date:
June 15, 2022
Export Citation:
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Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/58; C21D8/02; C22C38/00; C22C38/48
Domestic Patent References:
WO2016047734A12016-03-31
Foreign References:
KR20190020393A2019-03-04
KR101735007B12017-05-15
KR101550738B12015-09-08
KR20170069338A2017-06-21
JP2020050940A2020-04-02
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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