How is Steel DOM Round Tubing manufactured

Steel DOM (Drawn Over Mandrel) Round Tubing is manufactured through a multi-step process that ensures its high-quality characteristics.

The process begins with the selection of a suitable steel billet or hollow tube as the raw material. This initial material should have the appropriate chemical composition to meet the desired mechanical and physical properties of the final tubing.

First, the raw material is pierced or drawn to form a hollow tube. Then, in the key DOM process, the tube is drawn over a mandrel. The mandrel is a precisely shaped rod that the tube is forced over. This drawing operation not only helps to reduce the outside diameter of the tube to the desired size but also refines the internal diameter by ensuring a consistent and smooth inner surface. As the tube is drawn, it undergoes significant cold-working. This cold-working process enhances the strength and hardness of the steel.

After the drawing process, the tubing may go through additional finishing steps. It's often annealed to relieve the internal stresses that have built up during the cold-working stage. Annealing involves heating the tubing to a specific temperature and then slowly cooling it. This helps to improve the ductility of the steel without sacrificing too much of its strength. Finally, the tubing is straightened, cut to the desired lengths, and may be further processed with surface treatments such as polishing or coating to enhance its appearance and corrosion resistance.

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