... boiler ,high pressure A: Pipe and tube Size Range:GB/T8162 carbon steel sprial pipe1) Round pipe diameter: ... 8mm-3000mm, thickness: 0.4-60.0mm2) Square tube: 10 x 10mm-1000 x 1000mm, thickness: 0. ... 500mm-16,000mmD: Steel grade: 10#, 20#, A106B, A53B, Q195 Q235, Q345, ST37-2, ST52, S235, S355, SS400, A1010, ... SAE1045, X40, X60, A312, 304, 316 etc GB/T8162 carbon steel sprial pipe