Ferritic stainless steel sheet excellent in oxidation resistance

Patent metadata

Field	Value
Publication number	US-9243306-B2
Application number	US-201113583700-A
Country	US
Kind code	B2
Filing date	Mar 11, 2011
Priority date	Mar 11, 2010
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

Ferritic stainless steel sheet which has a high oxidation resistance and scale spallation resistance even at a high temperature near 1000° C., characterized by containing C: 0.020% or less, N: 0.020% or less, Si: over 0.10 to 0.35%, Mn: 0.10 to 0.60%, Cr: 16.5 to 20.0%, Nb: 0.30 to 0.80%, Mo: over 2.50 to 3.50%, and Cu: 1.00 to 2.50%, having an amount of increase of oxidation after a continuous oxidation test in the air at 1000° C. for 200 hours of 4.0 mg/cm 2 or less, and having an amount of scale spallation of 1.0 mg/cm 2 or less.

First claim

The invention claimed is:

1. A ferritic stainless steel sheet excellent in oxidation resistance comprising, by mass %,
C: 0.02% or less,
N: 0.02% or less,
Si: over 0.10 to 0.35%,
Mn: 0.10 to 0.60%,
Cr: 16.5 to 20.0%,
Nb: 0.30 to 0.80%,
Mo: over 2.50 to 3.50%,
Cu: 1.20 to 2.50%, and
a balance of Fe and unavoidable impurities,
wherein the ferritic stainless steel sheet has an amount of increase of oxidation after a continuous oxidation test in air at 1000° C. for 200 hours of 4.0 mg/cm 2 or less, and
has an amount of scale spallation of 1.0 mg/cm 2 or less,
and wherein the ferritic stainless sheet does not contain Ti.

2. The ferritic stainless steel sheet excellent in oxidation resistance as set forth in claim 1 further comprising, by mass %, at least one of W: 2.0% or less, B: 0.0030% or less, Mg: 0.0100% or less, Al: 1.0% or less, Ni: 1.0% or less, Sn: 1.00% or less, V: 0.50% or less, Zr: 1.0% or less, Hf: 1.0% or less, or Ta: 3.0% or less.

Assignees

• Kanno Norihiro
• Inoue Yoshiharu
• Hamada Junichi
• Nippon Steel & Sumikin Sst

Inventors

• Kanno Norihiro
• Inoue Yoshiharu
• Hamada Junichi

Classifications

• C21D9/46 Primary

  for sheet metals · CPC title

• C22C38/26

  with niobium or tantalum · CPC title

• C22C38/008

  containing tin · CPC title

• C22C38/04

  containing manganese · CPC title

• C21D6/002

  containing Cr (C21D6/004 takes precedence) · CPC title