Boiler Seamless Steel Tube: a. O.D.: 1/2'' to 4'' b. W.T.:SCH40,80, ... ; Cu≤0.25; Ni≤0.25W.T TOLERANCE: ±12.5%O.D TOLERANCE: ASTM A53 GRBD<48.3 ±0.4/-0 ... , DIN, GB , and so on.Material: Q235, ST52,ST42,A106 -a, A106-B , and so on Boiler seamless carbon steel tube