Tubes- seamless - Import export

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.

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.

Seamless tube elbows made of aluminum for welding.

Bush conveyor chains are often used for conveying tasksinvolving long transport distances at relatively low speeds. Since only a small minority of chains used in the industry are totally compliant with one specific standard, ELITE conveyor chains are custom-made to a specific customer order and consequently fulfil a large number of special requirements. ELITE highlights: • Pins usually made of heat-treated alloy steel, inductionhardened • Bushes made from seamless precision steel tube, case-hardened • Link plates made of high-strength tempered steel or case-hardened steel alloy • Rollers (where present) made of case-hardened steel, case-hardened

Many ELITE hollow pin chains are constructed to the dimensionsof standard ISO 606. Since customer requirements are so diverse, the ELITE product range has also been adapted to include various versions of this chain type: • Hollow pin roller chains • Hollow pin bush chains • Bushless hollow pin roller chains ELITE highlights: • Available based on the same chains manufactured to ISO 606 or as special chains • All ELITE chain plates 1 are manufactured using processes such as fine blanking and ball-drifting, so a particularly high contact ratio is guaranteed. • Solid, case hardened rollers 2 with good wear resistance • In general, hollow pins 3 made of seamless precision steel tube for improved precision and wear resistance • Many of these chains are supplied pair-matched to ensure exact parallel running, one of the main requirements that these chains must fulfil.

Examples of applications include pressure switches or thermostats: Deep-drawing techniques to manufacture seamless tubing up to 50mm ID and 450mm length - in wall-thicknesses as low as 0,064mm. Based on this, our smalles precision bellows start with only 6X4,2mm. Mainly requested with individual bottom shape, they are performing as reliable force transmitters. Besides bronze and brass, stainless steel and other alloys are available.

Stainless steel bellows, formed from seam-welded thin wall tubing Stainless steel bellows, formed from deep-drawn seamless tubing Bronze and Brass bellows for measuring and controlling applications Hydroformed bellows from exotic alloys as Beryllium copper or Monel400 Customized designs and end forms, also off-the-shelf standard solutions Special coatings on demand

* seamless steel tubes EN 10216-1 | EN 10216-2 | EN 10216-3 | EN 10297-1 OD 17,2 - 660 mm | WT 2 - 75 mm EN 10210-2 OD 21,3 - 323,9 mm | WT 2 - 12,7 mm EN 10255 L/M/H OD 21,3 - 165,1 mm | WT 2 - 4,5 mm(L), 2,6 - 5 mm(M), 3,2 - 5,4 mm(H)