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.

DIN 2391, EN 10305-1, E355+N(SR), hard chrome-plated outside 25 +/-5 µm, fit f7 Dimensional range: Outer diameter 12,0 - 140 mm

As per the norm EN 10297 specifies the technical delivery conditions for seamless round steel tubes. The tubes for mechanical applications are mainly used in those processes in which turning and CNC machines are used. The wide size range available, with OD from 21.3 to 812 mm, gives the possibility to manufacture several kinds of components for different applications: small machine parts, flanges, fittings, Archimedean screws, hydraulic cylinders for heavy machines etc.

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.

The round SEAMLESS tubes are hot rolled and satisfy both the requirements of the norm EN 10210 for structural applications and EN 10297-1 for mechanical applications. These steel tubes are fully killed and are suitable for structural applications but with the possibility to reach up to 100 mm w.t., which is impossible for welded tubes. These tubes are used for the manufacture of various kinds of construction components, above all where heavy wall thickness are required. EN 10210-1/2 (structural applications) EN 10297-1 (mechanical applications)

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.

Deep-drawn tubes from stainless steels (with a closed side or open) Deep-drawn tubes from non-ferrous metals as bronze, brass,... Seamless sleeves made with stamping processes Ultra thin-walled tubing in Beryllium copper or other special alloys Annealing services in vacuum furnaces Washing technologies for soap and oil The precision tubing is needed at Mera Bellows to manufacture seamless metal bellows.

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)