Title:
FERRITIC STAINLESS STEEL SHEET, AND METHOD FOR PRODUCING FERRITIC STAINLESS STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2023/042470
Kind Code:
A1
Abstract:
This ferritic stainless steel sheet has a chemical composition comprising, in % by mass, more than 0% and 0.008% or less of C, 0.01 to 2.50% of Si, 0.01 to 0.50% of Mn, 0.0001 to 0.040% of P, 0.001 to 0.010% of S, 0.001 to 2.500% of Al, 10.0 to 25.0% of Cr, more than 0% and 0.80% or less of Nb, 0.05 to 0.50% of Ti, 0.01 to 0.15% of V, more than 0% and 0.050% or less of N and a remainder made up by Fe and impurities, in which a passivation film has a compositional parameter PS represented by formula (1) of 0.03 to 0.15 inclusive, and the surface cover ratio by an Al-containing oxide having an equivalent circle diameter of 0.01 to 1.0 μm inclusive in the passivation film is 15 to 40%. PS = Al/(Ti+Mn+Si+Cr) ... formula (1)
In formula (1), the element symbols respectively represent the contents (% by mass) of the elements at a depth position at which the amount of Al is largest in the depth direction of the passivation film.
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Inventors:
SAMPEI SATOSHI (JP)
HAMADA JUN-ICHI (JP)
TERAOKA SHINICHI (JP)
FUJIMURA YOSHITOMO (JP)
HAMADA JUN-ICHI (JP)
TERAOKA SHINICHI (JP)
FUJIMURA YOSHITOMO (JP)
Application Number:
PCT/JP2022/017934
Publication Date:
March 23, 2023
Filing Date:
April 15, 2022
Export Citation:
Assignee:
NIPPON STEEL STAINLESS STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/34; C22C38/60; C25F1/06
Domestic Patent References:
| WO2016035241A1 | 2016-03-10 | |||
| WO2010010916A1 | 2010-01-28 |
Foreign References:
| JP2021004384A | 2021-01-14 | |||
| JP2020063499A | 2020-04-23 | |||
| JP2012112025A | 2012-06-14 | |||
| JP2018168415A | 2018-11-01 | |||
| JP2015518087A | 2015-06-25 | |||
| JP2021151019A | 2021-09-27 | |||
| JP2012112025A | 2012-06-14 | |||
| JPH05271880A | 1993-10-19 | |||
| JP2016023341A | 2016-02-08 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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