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.

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.

The different kinds of cold drawn tubes ready on stock cover a wide range of applications: COLD DRAWN SEAMLESS AND WELDED TUBES SUITABLE FOR HONING. COLD DRAWN SEAMLESS AND WELDED TUBES INSIDE H8. COLD DRAWN SEAMLESS TUBES FOR SHAFTS. WELDED SMOOTH BORE CYLINDER TUBES INSIDE H9 OR H10. COLD DRAWN SEAMLESS TUBES FOR HYDRAULIC AND PNEUMATIC POWER SYSTEMS. Seamless and Welded Cold Drawn pipes honed or ready for honing; H8, H9 or H10. STEELGRADES AND DELIVERY CONDITIONS COLD DRAWN / HARD (+C acc. EN 10305 / BK acc. DIN 2391) No heat treatment after final cold drawing. COLD DRAWN / SOFT (+LC acc. EN 10305 / BKW acc. DIN 2391) The final heat treatment is followed by a suitable drawing pass (limited reduction of area). STRESS RELIEVED (+SR acc. EN 10305 / BK+S acc. DIN 2391) After the final cold drawing process, tubes are stress relieved in controlled atmosphere in order to reduce work hardening due to the cold forming process. ANNEALED (+A acc. EN 10305 / GBK acc. DIN 2391) After...

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)

* 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)