Cold-Rolled Welded Tube

A cold-rolled welded tube begins with welded mother tube and is progressively reduced by precision rolling over controlled tooling. The rolling action distributes deformation over repeated contact, making this route suitable when wall consistency, roundness and a smooth bore or outside surface are central to the component. It should not be specified as interchangeable with cold drawing without reviewing the functional dimensions and production volume.

When to Specify Cold Rolling

Use cold rolling when the design prioritizes controlled wall reduction, stable round geometry and a finish that can reduce later processing. Provide outside diameter, inside diameter or wall thickness priorities, along with ovality, eccentricity, straightness and roughness requirements. The supplier can then confirm the reduction schedule and inspection method instead of relying on the general term “precision tube.”

Mechanical Condition and Downstream Work

Rolling below the recrystallization temperature changes strength, hardness and residual stress. Specify the final delivery condition according to whether the tube will be honed, machined, welded, bent, plated or heat treated. Where dimensional stability is critical, coordinate straightening and stress relief with the final machining allowance.

Quality Planning

Control starts with the welded mother tube and continues through rolling, heat treatment, straightening and final measurement. State the required weld examination, dimensional records, surface acceptance, material certificate, marking and corrosion protection. A sample lot is recommended when the application has a functional bore, sealing surface or unusually tight wall requirement.