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Seamless or welded pipes

You know that stainless steel pipes can be manufactured in both seamless or welded forms. But what are the benefi ts offered by each of the two production processes? Which aspects arise for the quality and design of the end products?

Production Processes

Seamless pipes are manufactured using different procedures, depending on the diameter or the ratio of diameter to wall thickness. The normal raw material is a round spool section preheated in a rotary furnace, or for larger diameters a hollow section preshaped in a perforation press, which is then prerolled in a rotary rolling mill. In the manufacture of longitudinally welded pipes, either individual steel plates or coils are used as raw material. The pipes are produced in a series of different, sequenced process stages, including cold forming, welding, heat treatment, calibration and non-destructive testing.

Dimensions

Manufacturers of both seamless and welded pipes offer a wide range of standard sizes for different branches of industry. For the individual production of welded pipes, the raw materials can be ordered and used in precise thicknesses depending on the wall thickness calculations, which will deliberately save resources and cut costs.



Cost-Effectiveness

When you consider cost-effectiveness, the advantages of seamless pipes for small to medium-sized outside diameters with higher wall thicknesses are clear. On the other hand, welded pipes are more advantageous for small, medium-sized and large outside diameters with wall thicknesses of between 2 and 70 mm.

Conclusion

The decision whether to use a seamless or welded pipe depends principally on the wall thickness / diameter ratio and the specified pipe tolerances. Normally the advantages of the welded pipe outweigh the alternative, and so at the moment in Western European industry it is mainly welded pipes which are used.