CPC B21D 3/12 (2013.01) [C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/105 (2013.01); C21D 9/08 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/22 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C21D 1/34 (2013.01)] | 13 Claims |
1. A method for manufacturing a tube, comprising the steps in the following order:
providing a hollow comprising a ferritic FeCrAl-alloy;
heating the hollow to a temperature below a recrystallization temperature of the ferritic FeCrAl-alloy;
cold working the heated hollow into the tube;
annealing the cold worked tube; and
straightening the annealed tube using a straightening method including the steps of:
heating the tube, and
straightening and forming the heated tube by stretching,
wherein the hollow, during cold working, has a temperature in a range from about 90° C. to about 600° C.,
wherein cold working the heated hollow into the tube is pilgering or drawing, and
wherein the ferritic FeCrAl-alloy comprises, in wt-%:
Cr 9 to 25,
Al 3 to 7,
balance Fe, and
normally occurring impurities.
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