Tube Forming Rolls

Tube Forming Rolls.

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ROLLS FOR WELDED TUBE MILLS

Applications for longitudinally welded tubes and pipes cover many areas; a few examples are line pipe for different media and tubes for construction, mechanical engineering and the furniture and automotive industries. Depending primarily on the tube dimensions and material, welded tubes are manufactured by a number of different processes.

Longitudinally welded tubes are manufactured by cold-forming a flat strip, with forming rolls, into an open seam tube which is then continuously welded. After welding the tube is sized and straightened. The design of rolls for the pre-forming stages in tube manufacture, such as centre line, base line, w-forming or linear cage forming, is tailored to the customer’s individual requirements. Our design engineers are able to review the forming process and suggest alternative forming methods to improve product quality and productivity.

The rolls must be accurate, and require a high wear resistance and toughness. S+C B&J manufactures rolls in a wide range of sizes for most types of mill, either in accordance to customer’s drawings, or if required, including design.

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A number of processes are used for longitudinally welding tubes including argon arc, laser, plasma, electric resistance, high-frequency contact and high-frequency induction welding. The latter process is most common today; it can be used for practically all types of tube. For all these processes S+C B&J supply weld rolls made from materials that offer either a good wear resistance or high toughness in combination with good high temperature strength. As an option for the high-frequency resistance welding S+C B&J are able to supply rolls made from the special tool steel Märker® REMU which, due to its antimagnetic properties, prevents the rolls getting too hot while maintaining a good wear resistance.

Further details of the recommended materials and hardness can be found in the following table. Our technical staff are always on hand for individual technical advice.

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