Title:
FERRITIC STAINLESS STEEL HAVING IMPROVED CORROSION RESISTANCE, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2020/111546
Kind Code:
A1
Abstract:
A ferritic stainless steel having improved corrosion resistance is disclosed. The disclosed ferritic stainless steel comprises, by wt%, 0.02% or less (excluding 0) of C, 0.02% or less (excluding 0) of N , 0.5% or less (excluding 0) of Si , 0.3% or less (excluding 0) of Mn , 16-20% of Cr, 0.4% or less (excluding 0) of Ni, and the balance of Fe and inevitable impurities, wherein the amount of Cr by wt%, of the thickness region of 3 nm from the surface of a passivating layer, is at least 1.2 times the amount of Cr by wt%, of stainless steel base metal.
Inventors:
KIM KWANG MIN (KR)
OH KKOCH NIM (KR)
KIM DONG-HOON (KR)
OH KKOCH NIM (KR)
KIM DONG-HOON (KR)
Application Number:
PCT/KR2019/014743
Publication Date:
June 04, 2020
Filing Date:
November 01, 2019
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/40; C22C38/00; C22C38/02; C22C38/04; C22C38/48; C22C38/50; C25D11/38
Foreign References:
| JPS6323623B2 | 1988-05-17 | |||
| KR101798406B1 | 2017-11-17 | |||
| JP6298881B2 | 2018-03-20 | |||
| JPH09143614A | 1997-06-03 | |||
| JPH0860243A | 1996-03-05 |
Other References:
See also references of EP 3872218A4
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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