Tube and a method of manufacturing a tube
AssigneeKanthal AB
InventorKrister Wickman
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Abstract
A high temperature iron-chromium-aluminium (FeCrAl) alloy tube extending along a longitudinal axis, wherein the tube is formed from a continuous strip of a high temperature FeCrAl alloy and comprises a helical welded seam. The high temperature FeCrAl alloy tube is manufactured by feeding a continuous strip of the high temperature FeCrAl alloy toward a tube shaping station, helically winding the strip such that long edges of the strip abut each other and a rotating tube moving forward in a direction parallel to its longitudinal axis is formed, and continuously joining said abutting long edges together in a welding process directly when the tube is formed, whereby a welded tube comprising a helical welded seam is obtained.
Claims14
A high temperature iron-chromium-aluminium alloy tube, comprising:
- a tube wall extending along a longitudinal axis;
- and
- a helical welded seam,
- wherein the tube is formed from a continuous strip of iron-chromium-aluminium alloy,
- wherein the iron-chromium-aluminium alloy comprises:
- 20.5-25 wt. % Cr,
- 2.5-8 wt. % Al,
- 0-5 wt. % Mo,
- the balance being Fe and normally occurring impurities, and
- optionally other intentionally added alloying elements,
- wherein the tube has an inner diameter that is constant along the longitudinal axis,
- wherein the tube has an outer diameter of 93 to 108 mm, and
- wherein a wall thickness of the tube is 0.5 to 7.5% of the inner diameter of the tube.
Dependencies are inferred from the claim text.