Hollow sections or pipes are manufactured on a tube mill using high-frequency induction welding techniques. The flat strip is seam welded while round in shape and then gradually brought to the desired section in the sizing mill. The welded seam is put to a great amount of cold working while being sized. This is a very severe test of the strength of a seam weld and ensures that each length of the hollow section is welded for maximum strength.

The pipes are produced in round, rectangular, and square sections conforming to high leading international standards.