... the products 2..low and medium pressure boiler ,high pressure API 5L carbon seamless steel pipeA: Pipe and tube Size Range ... : Steel grade: 10#, 20#, A106B, A53B, Q195 Q235, Q345, ST37-2, ST52, S235, S355, SS400, A1010, SAE1045, X40, X60, A312, 304, 316 ...