Norskhydro Asa

Hydro Extruded Solutions As

Xiao-Jun Jiang

Morten Syslak

Arvid Espedal

Minxia Li

Børge Bjørneklett

Jon Dag Evensen

Gro Stakkestad

A method for producing an aluminium alloy extrusion, consisting of an alloy with the composition ≤0.30% by weight of silicon, ≤0.40% by weight of iron, 0.01-1.1% by weight of manganese, ≤0.30% by weight of magnesium, ≤0.70% by weight of zinc, ≤0.35% by weight of chromium, ≤0.20% by weight of zirconium, ≤0.25% by weight of titanium, ≤0.20% by weight vanadium, ≤0.10% by weight of copper, up to 0.15% by weight of other impurities, each not greater than 0.03% by weight and the balance aluminium, the method comprising the steps casting the molten metal into extrusion billet a) subjecting the billet to a homogenization treatment at a holding temperature of 550 to 620° C. for 6 to 10 hours b) heating the billet to a temperature of 400 to 550° C. c) extruding the billet to a tube.

Method for producing a corrosion and high temperature resistant aluminum alloy extrusion material

A method for producing a corrosion resistant aluminum alloy extrusion. The method includes providing molten alloy with a composition comprising ≤0.30, % by weight of silicon, ≤0.40, % by weight of iron, 0.01-0.6% manganese, ≤0.30, % magnesium, ≤0.70, % zinc, 0.05-0.35% chromium, 0.02-0.20% zirconium, ≤0.25% titanium, ≤0.20% vanadium, ≤0.10% copper, up to 0.15% by weight of other impurities, each not greater than 0.03% by weight, and the balance aluminum. The method includes casting the alloy into an extrusion billet, subjecting the billet to a homogenization treatment at a holding temperature of 550 to 620 deg.C for 6 to 10 hours, heating the billet to a temperature of 400 to 550 deg.C, and extruding the billet to a tube.

The invention relates to a method and an aluminium alloy sheet material. The method of producing aluminium alloy sheet material comprising the following steps: continuous strip casting of a sheet at a predetermined solidification rate ensuring material microstructure exhibiting primary particles having average size below 1 micrometer, and (cold) rolling of the strip cast sheet to an appropriate gauge with optionally intermediate annealing during the cold rolling. It is an object of the present invention to provide a novel method of production of Al-alloy sheets applicable on heat exchanger sheet based components resulting in improved pitting corrosion applying (base) Al-alloy material with higher Fe-content.

Method for producing aluminum alloy sheet material and an aluminium alloy sheet

The invention relates to a series of extra strong and durable aluminium alloy brazing sheets with enhanced corrosion resistance for brazed heat exchangers. The alloy sheets are based on recycled materials and are suitable for manufacturing of fins, welded tubes, headers and sideplates. The alloy sheets showed improved corrosion performance with respect to pitting corrosion, excellent high temperature sagging resistance and post braze strength, and a good brazeability. By optimising the material combination of fin, tube, header and sideplates it is possible to produce a heat exchanger with adequate corrosion performance in SWAAT.

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Haugesund, Norway

Xiao-Jun Jiang