GB/T8162 carbon steel sprial pipe 1. many different sizes of the products 2..low and medium pressure boiler ,high pressure A: Pipe ... and tube Size Range:GB/T8162 carbon steel ... : Steel grade: 10#, 20#, A106B, A53B, Q195 Q235, Q345, ST37-2, ST52, S235, S355, SS400, A1010, SAE1045, X40, X60, A312, 304 ...