Title:
FERRITIC STAINLESS STEEL WITH EXCELLENT SURFACE CORROSION RESISTANCE AFTER POLISHING, AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2014/157578
Kind Code:
A1
Abstract:
Provided are a ferritic stainless steel which, even when subjected to rough polishing, is inhibited from decreasing in surface corrosion resistance and a process for producing, through a smaller number of steps, a ferritic stainless steel in which the surface corrosion resistance can be inhibited from decreasing through polishing.
The ferritic stainless steel is characterized by containing, in terms of mass%, up to 0.030% C, up to 0.030% N, 0.15-3.0% Si, up to 1.5% Mn, up to 0.04% P, up to 0.01% S, 12-22.5% Cr, up to 0.60% Nb, up to 0.60% Ti, and up to 0.80% Al, having polishing marks so as to result in an arithmetic average surface roughness Ra of 0.45-5.0 μm, and having average Si and Fe concentrations by mass of 5% or greater and 75% or less, respectively, in the portion ranging from the surface to a depth of 10 nm therefrom. The ferritic stainless steel can be produced by temper rolling at a draft of 0.5-5.0%.
Inventors:
TAMURA YUUICHI (JP)
MATSUHASHI TOORU (JP)
ISHIMARU EIICHIRO (JP)
MATSUHASHI TOORU (JP)
ISHIMARU EIICHIRO (JP)
Application Number:
PCT/JP2014/059017
Publication Date:
October 02, 2014
Filing Date:
March 27, 2014
Export Citation:
Assignee:
NIPPON STEEL & SUMIKIN SST (JP)
International Classes:
C22C38/00; B21B3/02; C21D9/46; C22C38/34; C22C38/54
Foreign References:
| JP2008266696A | 2008-11-06 | |||
| JP2009041041A | 2009-02-26 | |||
| JP2012193392A | 2012-10-11 | |||
| JP2007239060A | 2007-09-20 | |||
| JP2012214897A | 2012-11-08 | |||
| JP2005307293A | 2005-11-04 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
Download PDF:
Previous Patent: BREAD QUALITY IMPROVING AGENT AND PRODUCTION METHOD FOR BREADS
Next Patent: IMAGING ELEMENT AND IMAGING APPARATUS
Next Patent: IMAGING ELEMENT AND IMAGING APPARATUS