Seamless drawn tubesMade for Perfection
Seamless drawing – what does this mean and what advantages does this manufacturing process offer compared to other tubes?
For almost seven decades, Peterseim Metallwerke has been a supplier of seamless drawn brass and aluminium precision tubes worldwide. Properties such as high corrosion resistance, strength, resilience, conductivity, antimicrobial potency, perfect surface finish and very good machinability are quality features of our tubes.
Production and advantages
of seamless drawn tubes
The input material for seamless drawn tubes is produced by extrusion. In this process a red-hot brass or aluminium billet is pressed through a die with the aid of a hydraulic press, resulting in a thick-walled pressed tube.
In Peterseim production these pressed tubes are drawn to the desired diameters, wall thicknesses, material strengths and surfaces on drawing machines using the cold forming process and the appropriate lubricants. The tool sets used in this process consist of the die, which determines the outside diameter, and the drawing mandrel, which defines the inside diameter. These dimensions are the basis for varying wall thicknesses and lengths. After drawing, this operation can be repeated as many times as necessary with the help of thermal treatment at temperatures of around 500°. As often as necessary until the desired dimensions, with the corresponding strength, is reached. The quality of the tube surface improves with each drawing operation. Seamless drawing produces round tubes or profiled tubes in almost any geometric form.
After drawing, the tubes are cleaned of lubricants and cut to length. In an optimised process the partial result of the drawing is inspected. Then the next work step begins, such as further processing, finishing or delivery.
The advantages of seamless tubing are obvious. Unlike welded tubing, our seamless drawn tubing does not have a welded seam and therefore does not present this weak point. This advantage is particularly noticeable when tubes have to withstand high pressure or are further processed (e.g. bent). Further advantages are the almost unlimited possibilities regarding tube diameter and wall thickness as well as the highest degree of flexibility in the production of very small quantities up to large-scale production.