Stainless steel U-tube
1) Diameter: *3.****3.1
2) Thickness: 1.****2mm
3) Materials: **4, **4L, **6, **6L, **2, etc.
4) Standard: ASTM A**9, ASTM A**2, ASTM A**3, ASTM A**9 etc.
5) Marking: grade, standard, Size, heat No
6) Package: wooden cases or steel box
7) Mill test certificate: EN ******3.1B.
8) Payment: T/ T, L/ C

U-tubes are bended according to drawings from cold drawn seamless steel tubes& stainless steel tubes according to standard ASTM A**9 or A**3.
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) **0% Eddy Current tests.

Bending radius as per your drawings
Dimensional tolerances as per standards
Flattening at the bend should not exceed *0% of the norminal tube outerside.