... , such as seamless carbon steel pipe and tube, JCOE technology Large Diameter, Thick Wall Steel Pipes and Tubes, ERW/LSAW welded carbon ... meters, thickness less than 2 inch etc. Standard:According to API 5L Gr.B standard.GB/TB163, GB/T8162, GB/T3087, GB ... .B spec 1/2.Material:According to NACE MR 0175 standard.Q345, ST35.8, ST37, ST42, ST52, A53, A106, A179, API5L ...