Steel alloy for compound tubes
First Claim
1. A method of use of an iron chromium alloy with a ferritic microstructure, the iron chromium alloy includes in weight-%:
- carbon;
<
0.3, chromium;
5-30, nickel;
<
10, manganese;
<
5, molybdenum;
<
5, aluminum;
3-20, silicon;
<
5, nitrogen;
<
0.3, cerium+lanthanum+hafnium+yttrium;
<
1.0, titanium 0.000-1.0, zirconium;
0.000-1.0, vanadium;
0.000-1.0, niobium;
0.000-1.0, and the rest iron, apart from naturally occurring impurities;
wherein the method comprises forming a compound tube comprising a layer of a load carrying material and a layer of the iron chromium alloy.
3 Assignments
0 Petitions
Accused Products
Abstract
A compound tube comprises a layer of a Fe—Cr—Al-alloy and a layer of a load-carrying component and optionally one or several additional layers. The Fe—Cr—Al-alloy has the following analysis in weight-%: carbon<0.3, chromium 5-30, nickel<10, manganese<5, molybdenum<5, aluminium 3-20 , silicon<5, nitrogen<0.3, cerium+bafnium+yttrium<1.0, titanium 0.005-1.0, zirconium 0.005-1.0, niobium 0.005-1.0, the remainder iron, and naturally occurring impurities. These tubes are very resistant towards carbonization and “metal dusting” and are being used to advantage for bayonet tubing, superheat tubing and reformer tubing in steam formation.
31 Citations
11 Claims
-
1. A method of use of an iron chromium alloy with a ferritic microstructure, the iron chromium alloy includes in weight-%:
-
carbon;
<
0.3,chromium;
5-30,nickel;
<
10,manganese;
<
5,molybdenum;
<
5,aluminum;
3-20,silicon;
<
5,nitrogen;
<
0.3,cerium+lanthanum+hafnium+yttrium;
<
1.0,titanium 0.000-1.0, zirconium;
0.000-1.0,vanadium;
0.000-1.0,niobium;
0.000-1.0, andthe rest iron, apart from naturally occurring impurities; wherein the method comprises forming a compound tube comprising a layer of a load carrying material and a layer of the iron chromium alloy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 11)
-
-
8. Compound tube including at least one layer of an iron chromium aluminium alloy, and at least one layer of a load carrying component, wherein the iron chromium aluminium alloy has the following composition in weight-%:
-
carbon;
<
0.3,chromium;
5-30,nickel;
<
10,manganese;
<
5,molybdenum;
<
5,aluminum;
3-20,silicon, <
5,nitrogen;
<
0.3,cerium+lanthanum+hafnium+yttrium;
<
1.0,titanium;
0.000-1.0,zirconium;
0.000-1.0,vanadium;
0.000-1.0,niobium;
0.000-1.0, andthe rest iron, apart from naturally occurring impurities. - View Dependent Claims (9, 10)
-
Specification