Tube and a method of manufacturing a tube
AssigneeSandvik Intellectual Property 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.
Claims20
An iron-chromium-aluminium alloy tube, comprising:
- a tube wall extending along a longitudinal axis;
- and
- a helical welded seam,
- wherein an inner diameter of the tube is 70 mm or less and the tube wall has a thickness of 0.35 mm or less,
- wherein the inner diameter of the tube is constant or almost constant along the longitudinal axis of the tube,
- wherein the helical welded seam extends at a helix angle of 40-70 degrees with respect to the longitudinal axis of the tube, and
- wherein the iron-chromium-aluminium alloy comprises:
- 5-25 wt. % Cr,
- 2.5-8 wt. % Al,
- 0-5 wt. % Mo, and
- the balance being Fe and normally occurring impurities, and
- optionally other intentionally added alloying elements.
Dependencies are inferred from the claim text.