Ferritic stainless steel foil

Patent metadata

Field	Value
Publication number	US-10151020-B2
Application number	US-201414907690-A
Country	US
Kind code	B2
Filing date	Jul 16, 2014
Priority date	Jul 30, 2013
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

The ferritic stainless steel foil has a composition containing, by mass %, C: 0.050% or less, Si: 0.20% or less, Mn: 0.20% or less, P: 0.050% or less, S: 0.0050% or less, Cr: 10.5% or more and 20.0% or less, Ni: 0.01% or more and 1.00% or less, Al: more than 1.5% and less than 3.0%, Cu: 0.01% or more and 1.00% or less, N: 0.10% or less, and further contains one or more elements selected from Ti: 0.01% or more and 1.00% or less, Zr: 0.01% or more and 0.20% or less, and Hf: 0.01% or more and 0.20% or less, and the balance being Fe and inevitable impurities. This enables a composite layer of an Al oxide layer and a Cr oxide layer to be formed on the surface of the ferritic stainless steel foil in a high-temperature oxidizing atmosphere at 800° C. or more.

First claim

The invention claimed is:

1. A ferritic stainless steel foil comprising a composition containing, by mass %:
C: 0.050% or less, Si: 0.20% or less,
Mn: 0.20% or less, P: 0.050% or less,
S: 0.0050% or less, Cr: 10.5% or more and 20.0% or less,
Ni: 0.01% or more and 1.00% or less, Al: more than 1.5% and less than 3.0%,
Cu: 0.01% or more and 1.00% or less, N: 0.10% or less,
and one or more elements selected from
Ti: 0.01% or more and 1.00% or less, Zr: 0.01% or more and 0.20% or less, and
Hf: 0.01% or more and 0.20% or less, and
the balance being Fe and inevitable impurities, and
a composite layer including an Al oxide layer and a Cr oxide layer, the composite layer being disposed on a surface of the ferritic stainless steel foil, wherein the area fraction of the Al oxide layer is 20% or more and the thickness of the composite layer is 1.0 μm to 10 μm.

2. The ferritic stainless steel foil according to claim 1 , wherein the composition further contains, by mass %, one or more elements selected from Ca: 0.0010% or more and 0.0300% or less, Mg: 0.0015% or more and 0.0300% or less, and REM: 0.01% or more and 0.20% or less.

3. The ferritic stainless steel foil according to claim 2 , wherein the composition further contains, by mass %, one or more elements selected from Nb: 0.01% or more and 1.00% or less, Mo: 0.01% or more and 3.00% or less, W: 0.01% or more and 3.00% or less, and Co: 0.01% or more and 3.00% or less such that the total content of the one or more elements is 0.01% or more and 3.00% or less.

4. The ferritic stainless steel foil according to claim 1 , wherein the composition further contains, by mass %, one or more elements selected from Nb: 0.01% or more and 1.00% or less, Mo: 0.01% or more and 3.00% or less, W: 0.01% or more and 3.00% or less, and Co: 0.01% or more and 3.00% or less such that the total content of the one or more elements is 0.01% or more and 3.00% or less.

Assignees

• Jfe Steel Corp

Inventors

• Mizutani Akito
• Fujisawa Mitsuyuki
• Ogata Hiroyuki

Classifications

• C22C38/02

  containing silicon · CPC title

• Y10T428/12972

  Containing 0.01-1.7% carbon [i.e., steel] · CPC title

• C22C38/002

  containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title

• Y10T428/12618

  Plural oxides · CPC title

• C23C8/18

  Oxidising of ferrous surfaces · CPC title