... ERW Welded Steel Pipe 323Design and manufacture many kinds of special steel pipe and tube accoring your request, such as seamless carbon steel pipe and ... tube, JCOE technology Large Diameter, Thick Wall Steel Pipes and Tubes, ERW/LSAW welded carbon steel pipes and ... 8, ST37, ST42, ST52, A53, A106, A179, API5L/GR.B-X42, X46, X52, X56, X60. X65. X70. X80.Weld standard: ...