LIFENG Material Forming Tube Bending

U-bent are widely used in heat-exchanger systems. Heat-exchanger equipment on the basis of seamless stainless U-tubes is essential in strategically important and critical fields — nuclear and petrochemical machine building.

U-tubes are bended according to drawings from cold drawn seamless steel tubes&stainless steel tubes according to standard ASTM A179 or A213.

Heat treatment:

1) Stress relive annealing of U-tubes after bending only for all positions

2) Surface condition finished U-tube shall be free of scale,without scratches after bending.

3) Through ball test

4) 100% Eddy Current tests.

5) 100% Hydrostatic tests after bending

Bending radius as per your drawings

Dimensional tolerances as per standards

Flattening at the bend should not exceed 10% of the norminal tube outerside.