Title:
FERRITIC STAINLESS STEEL SHEET HAVING EXCELLENT HEAT RESISTANCE
Document Type and Number:
WIPO Patent Application WO/2014/069543
Kind Code:
A1
Abstract:
The present invention provides a Sn-containing ferritic stainless steel sheet having excellent heat resistance. The ferritic stainless steel contains, in terms of mass %, 0.015% or less of C, 1.5% or less of Si, 1.5% or less of Mn, 0.035% or less of P, 0.015% or less of S, 13-21% of Cr, 0.01-0.50% of Sn, 0.05-0.60% of Nb and 0.020% or less of N, with the remainder consisting of Fe and unavoidable impurities. The ferritic stainless steel satisfies formula 1 and formula 2, and has a grain boundary Sn concentration of 2 atom % or less when subjected to a heat treatment at 600-750°C in which the value of L, as shown in formula 3, is 1.91×104 or higher.
8 ≤ CI = (Ti+0.52Nb) / (C+N) ≤ 26 (formula 1) GBSV = Sn+Ti-2Nb-0.3Mo-0.2 ≤ 0 (formula 2) L = (273+T) (log(t)+20) (formula 3)
T: Temperature (°C), t: time (h)
Inventors:
TERAOKA SHINICHI (JP)
FUKUDA AKIHIRO (JP)
KOBAYASHI MASAAKI (JP)
FUKUDA AKIHIRO (JP)
KOBAYASHI MASAAKI (JP)
Application Number:
PCT/JP2013/079461
Publication Date:
May 08, 2014
Filing Date:
October 30, 2013
Export Citation:
Assignee:
NIPPON STEEL & SUMIKIN SST (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/26; C22C38/60
Foreign References:
| JP2012197071A | 2012-10-18 | |||
| JP2012193392A | 2012-10-11 | |||
| JP2012207298A | 2012-10-25 | |||
| JP2000169943A | 2000-06-20 | |||
| JPH1192872A | 1999-04-06 |
Other References:
See also references of EP 2915894A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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