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
A high temperature iron-chromium-aluminium alloy tube, comprising:
- a tube wall extending extending along a longitudinal axis;
- and
- a helical seam
- wherein the tube is formed from a continuous strip of iron-chromium-aluminium alloy, and
- wherein the iron-chromium-aluminium alloy comprises:
- 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.
A method of manufacturing a tube having almost a constant or almost constant inner diameter extending along a longitudinal axis, comprising the steps of:
- feeding a continuous strip of a high temperature iron-chromium-aluminium alloy toward a tube shaping station;
- helically winding the strip in the tube shaping station such that long edges of the strip abut each other and a rotating tube moving forward in a direction parallel to the longitudinal axis is formed ;
- and
- continuously joining said abutting long edges together in a welding process directly from the high temperature iron-chromium-aluminium alloy tube to form a welded high temperature iron-chromium-aluminium alloy tube,
- wherein the welded high temperature iron-chromium-aluminium alloy tube includes:
- a tube wall extending extending along the longitudinal axis, and
- a helical seam
- wherein the high temperature iron-chromium-aluminium alloy has a composition including:
- 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.
Dependencies are inferred from the claim text.