	US 11,939,654 B2
	Method for producing a corrosion and high temperature resistant aluminum alloy extrusion material
Arvid Espedal, Mårslet (DK); Xiao-Jun Jiang, Haugesund (NO); and Minxia Li, Suzhou (CN)
Assigned to HYDRO EXTRUDED SOLUTIONS AS, Oslo (NO)
Appl. No. 17/799,892
Filed by HYDRO EXTRUDED SOLUTIONS AS, Oslo (NO)
PCT Filed Feb. 16, 2021, PCT No. PCT/EP2021/053784 § 371(c)(1), (2) Date Aug. 15, 2022, PCT Pub. No. WO2021/165266, PCT Pub. Date Aug. 26, 2021.
Claims priority of application No. 2050177-1 (SE), filed on Feb. 17, 2020; and application No. 2050198-7 (SE), filed on Feb. 21, 2020.
Prior Publication US 2023/0090974 A1, Mar. 23, 2023
Int. Cl. C22F 1/04 (2006.01); B32B 15/01 (2006.01); C22C 21/00 (2006.01)

CPC C22F 1/04 (2013.01) [B32B 15/017 (2013.01); C22C 21/00 (2013.01)]

10 Claims

1. A method for producing a corrosion resistant aluminum alloy tube, the method comprising:

providing a molten alloy with a composition consisting of:

0.05-0.15% by weight of silicon,

less than or equal to 0.40% by weight of iron,

0.01-0.6% by weight of manganese,

less than or equal to 0.30% by weight of magnesium,

less than or equal to 0.70% by weight of zinc,

0.05-0.35% by weight of chromium,

0.02-0.20% by weight of zirconium,

less than or equal to 0.25% by weight of titanium,

less than or equal to 0.20% by weight vanadium,

less than or equal to 0.10% by weight of copper,

up to 0.15% by weight of other impurities, each not greater than 0.03% by weight, and

a balance of aluminum;

casting the molten alloy into an extrusion billet;

subjecting the extrusion billet to a homogenization treatment at a holding temperature of 550 to 620° C. for 6 to 10 hours;

heating the extrusion billet to a temperature of 400 to 550° C.; and

extruding the extrusion billet to a tube.