STAINLESS STEEL SHEET AND STAINLESS STEEL FOIL

• US 20150299833A1
• Filed: 12/05/2013
• Published: 10/22/2015
• Est. Priority Date: 12/17/2012
• Status: Active Grant

• Current Assignee: JFE Steel Corporation (JFE Holdings Incorporated)
• Original Assignee: JFE Steel Corporation (JFE Holdings Incorporated)
• Inventors: Ota, Hiroki, Ogata, Hiroyuki, Mizutani, Akito, Fujisawa, Mitsuyuki
• Granted Patent: US 9,777,357 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B01J 35/04 Foraminous structures, sieves, grids, honeycombs
• CPC Class Codes: B01J 35/56 Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
• CPC Class Codes: B01J 37/0225 of metal substrates
• CPC Class Codes: C21D 6/002 containing Cr C21D6/004 takes precedence
• CPC Class Codes: C21D 8/0226 Hot rolling
• CPC Class Codes: C21D 8/0236 Cold rolling
• CPC Class Codes: C21D 8/0268 between cold rolling steps
• CPC Class Codes: C21D 9/46 for sheet metals
• CPC Class Codes: C22C 38/00 Ferrous alloys, e.g. steel alloys cast-iron alloys C22C37/00
• CPC Class Codes: C22C 38/001 containing N
• CPC Class Codes: C22C 38/002 containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
• CPC Class Codes: C22C 38/004 Very low carbon steels, i.e. having a carbon content of less than 0,01%
• CPC Class Codes: C22C 38/005 containing rare earths, i.e. Sc, Y, Lanthanides
• CPC Class Codes: C22C 38/02 containing silicon
• CPC Class Codes: C22C 38/04 containing manganese
• CPC Class Codes: C22C 38/06 containing aluminium
• CPC Class Codes: C22C 38/42 with copper
• CPC Class Codes: C22C 38/44 with molybdenum or tungsten
• CPC Class Codes: C22C 38/46 with vanadium
• CPC Class Codes: C22C 38/48 with niobium or tantalum
• CPC Class Codes: C22C 38/50 : with titanium or zirconium
• CPC Class Codes: C22C 38/54 : with boron
• CPC Class Codes: F01N 13/16 : Selection of particular materials

Abstract

Provided are an Fe—Cr—Al-based stainless steel sheet which has improved manufacturability by improving the toughness of a hot-rolled steel sheet and a cold-rolled steel sheet without deteriorating oxidation resistance at a high temperature and shape stability when used at a high temperature, and a stainless steel foil which is manufactured by rolling the stainless steel sheet.

V and B are added in combination to Fe—Cr—Al-based stainless steel in amounts within specified ranges. Specifically, V content is controlled to be 0.010% or more and 0.050% or less and B content is controlled to be 0.0001% or more and 0.0050% or less, in which the relationship {V content (V %)}/{B content (B %)}>10 is satisfied.

Claims

1. A stainless steel sheet having a chemical composition containing, by mass %, C:

0.020% or less, Si;

1.0% or less, Mn;

1.0% or less, P;

0.040% or less, S;

0.004% or less, Cr;

16.0% or more and 30.0% or less, Al;

2.00% or more and 6.50% or less, N;

0.020% or less, Ni;

0.05% or more and 0.50% or less, Cu;

0.005% or more and 0.10% or less, Ti;

less than 0.050%, Nb;

less than 0.050%, V;

0.010% or more and 0.050% or less, B;

0.0001% or more and 0.0050% or less, at least one of Zr;

0.005% or more and 0.200% or less, Hf;

0.005% or more and 0.200% or less, and REM (rare earth metals);

0.01% or more and 0.20% or less, and the balance being Fe and inevitable impurities, wherein

the relationship {V content (V %)}/{B content (B %)}>

10 is satisfied.

2. The stainless steel sheet according to claim 1, wherein the steel sheet has the chemical composition further containing, by mass %, at least one of Ca:

0.0002% or more and 0.0100% or less and Mg;

0.0002% or more and 0.0100% or less.

3. The stainless steel sheet according to claim 1, wherein the steel sheet has the chemical composition further containing, by mass %, at least one of Mo:

0.5% or more and 6.0% or less and W;

0.5% or more and 6.0% or less, and the total content of Mo and W is 0.5% or more and 6.0% or less.

4. A stainless steel foil having the chemical composition according to claim 1 and a thickness of 200 μ

m or less.