US 2011/0031235 A1 · DURABLE IRON-CHROMIUM-ALUMINUM ALLOY SHOWING MINOR CHANGES IN HEAT RESISTANCE

Abstract

An iron-chromium-aluminum alloy having a long service life and exhibiting little change in heat resistance, comprising (as percentages by weight) 4.5 to 6.5% Al, 16 to 24% Cr, 1.0 to 4.0% W, 0.05 to 0.7% Si, 0.001 to 0.5% Mn, 0.02 to 0.1% Y, 0.02 to 0.1% Zr, 0.02 to 0.1% Hf, 0.003 to 0.030% C, 0.002 to 0.03% N, a maximum of 0.01% S, and a maximum of 0.5% Cu, the remainder being iron and the usual steel production-related impurities.

Claims44

Dependent claims

An iron-chromium-aluminum alloy having a long service life and exhibiting little change in heat resistance, comprising:

4.5 to 6.5% Al;
16 to 24% Cr;
1.0 to 4.0% W;
0.05 to 0.7% Si;
0.001 to 0.5% Mn;
Y and/or at least one of Sc, La and Cer, the total proportion of Y, Sc, La and Cr being 0.02 to 0.1%;
Zr or Zr and at least one of Sc, La and Cer, the total proportion of Zr, Sc, La and Cer being 0.02 to 0.1%, or Zr and Ti, the total proportion of Zr and Ti being 0.02 to 0.1%;
Hf or Hf and at least one of Sc, La and Cer, the total proportion of Hf, Sc, La and Cer being 0.02 to 0.1%, or Hf and Ti, the total proportion of Hf and Ti being 0.02 to 0.1%;
0.003 to 0.030% C;
0.002 to 0,03% N;
a maximum of 0.01% S;
a maximum of 0.5% Cu;
the remainder being iron and usual steel production-related impurities.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/937,460Filed 2 Apr 2009

Priority

DE 10 2008 018 135.810 Apr 2008

Published

10 Feb 2011

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

C22C 38/005
Ferrous alloys, e.g. steel alloys: containing rare earths, i.e. Sc, Y, Lanthanides
C22C 38/001
Ferrous alloys, e.g. steel alloys: containing N
C22C 38/002
Ferrous alloys, e.g. steel alloys: containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
C22C 38/004
Ferrous alloys, e.g. steel alloys: very low carbon steels, i.e. having a carbon content of less than 0,01%

Abstract

Claims44

Dependent claims

An iron-chromium-aluminum alloy having a long service life and exhibiting little change in heat resistance, comprising:

4.5 to 6.5% Al;
16 to 24% Cr;
1.0 to 4.0% W;
0.05 to 0.7% Si;
0.001 to 0.5% Mn;
Y and/or at least one of Sc, La and Cer, the total proportion of Y, Sc, La and Cr being 0.02 to 0.1%;
Zr or Zr and at least one of Sc, La and Cer, the total proportion of Zr, Sc, La and Cer being 0.02 to 0.1%, or Zr and Ti, the total proportion of Zr and Ti being 0.02 to 0.1%;
Hf or Hf and at least one of Sc, La and Cer, the total proportion of Hf, Sc, La and Cer being 0.02 to 0.1%, or Hf and Ti, the total proportion of Hf and Ti being 0.02 to 0.1%;
0.003 to 0.030% C;
0.002 to 0,03% N;
a maximum of 0.01% S;
a maximum of 0.5% Cu;
the remainder being iron and usual steel production-related impurities.

10 more elements

Dependencies are inferred from the claim text.

Durable iron-chromium-aluminum alloy showing minor changes in heat resistance

Life of this patent

Abstract

Claims44

Durable iron-chromium-aluminum alloy showing minor changes in heat resistance

Life of this patent

Abstract

Claims44