Germany
Manufacturer/ Producer
Germany
Seamless aluminium tubes can be ordered in all commercially available aluminium alloys in addition to high strength aluminium alloys which are required for more demanding applications. ALUnna has a number of extrusion presses equipped with mandrel piercing capability. This allows us to extrude a large range of extruded tubular dimensions from a number of different billet diameters. The size range for seamless extruded tubes ranges from 17 mm to 300 mm in diameter.
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Aluminiumwerk Unna AG is specialised in the production of Aluminium tubes. The Aluminium tubes are extruded on site using two possible methods. These are either Seamless extrusion or Porthole extrusion. It is quite simple to distinguish between the two extrusion methods. In seamless extrusion, a mandrel is positioned and fixed inside the extrusion die, creating the inner contour of the tube. In porthole extrusion, the mandrel is fixed and is supported by a number of integral bridges affixed to the outer portion of the extrusion die.
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In the aluminium industry, the porthole extrusion process is the standard method for the production of extruded tubes and profiles. The process is limited to a number of aluminium alloys. However, most of the commercially available medium strength aluminium alloys such as EN AW-6060 or EN AW-6082 can be extruded by porthole extrusion.
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Depending on the application, tubes may require subsequent drawing following the extrusion process. Examples of this are: a requirement for a high degree of dimensional control and/or the need for tight tolerances, where the final outside diameter and/or wall thickness of the extruded tubes can only be achieved by subsequent cold drawing, where the final mechanical properties for non-heat treatable alloys are to be achieved by strain hardening (drawing) or where special requirements exist for the microstructure of the tubes.
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Aluminiumwerk Unna AG one of the world’s leading manufacturers of aluminium alloy tube. We produce a variety of specialist aluminium alloy products. Our core focus is the production of aluminium alloy tube and tubular profiles. These can be offered as seamless extruded or porthole extruded products. The extruded products can also be cold drawn making it possible to offer a comprehensive range of final dimensions.
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On request, we can supply aluminium alloys in the form of rod or bar. These are available in most of the commercially available aluminium alloys. The tolerances of extruded aluminium rods and bars can also be further improved by subsequent drawing. In recent years, ALUnna has specialised in the production of rod and bar meeting the highest quality standards. If you require a specific delivery option for rod or bar such as special testing then we will definitely find a solution for you.
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Not all extruded profiles are required to be circular in shape! Whether it is a seamless or porthole hollow-profile, at ALUnna, we have a multitude of possibilities. Simple profiles, such as a solid profile or an angle profile, are also available. On some profiles we may have the possibility to further improve the dimensional tolerances by adding a subsequent drawing step to achieve final dimensions. In addition to round tube, shaped, square or rectangular tubes in both medium strength and high-strength alloys can be produced.
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The purchase of Aluminium alloy billet is an option available to our customers from our on-site Cast house. The billets are cast by conventional direct chill semi-continuous casting using float-dip tube technology. The subsequent homogenisation takes place in one of our two homogenising ovens. We are able to offer short lead times for machined billet in smaller quantities than would otherwise be available. With the wide range of alloys and dimensions we can offer, we will surely find a solution for you.
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With the unique extrusion process, ALUnna has the capability to produce continuous lengths of extruded profiles. Unlike the conventional extrusion process, the continuous extrusion process does not use billets. Instead, raw material is fed into the process from a coil. This process is especially useful for the production of small extrusion profiles used as spacer bars in alloys EN AW-1050A / 1350A or EN AW-3103/3003. If necessary, there is an option to apply a draw pass to the spacer bar profile using an in-line Schumag continuous drawing machine in order to achieve the final dimension and the most demanding of tolerances.
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Uelzener Weg 36
59425 Unna - Germany