... 2..low and medium pressure boiler ,high pressure API 5L carbon seamless steel pipeA: Pipe and tube Size Range:1) ... : 8mm-3000mm, thickness: 0.4-60.0mm2) Square tube: 10 x 10mm-1000 x 1000mm, thickness: 0.6-60.0mm3 ... C: Length of each pipe: 500mm-16,000mmD: Steel grade: 10#, 20#, A106B, A53B, Q195 Q235, Q345, ST37-2, ST52, ... A1010, SAE1045, X40, X60, A312, 304, 316 etc API 5L carbon seamless steel pipe