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 โ 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.