... Carbon Steel Heat-Exchanger and Condenser TubesASTM A192: Standard Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure ... Welded Steel Pipe for Low-Temperature ServiceASTM A335: Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature ... : 10#, 20#, 35#, 45#, 16MN(Q345B)GB 3087: 10#, 20#, 35#, 45#, 16MN(Q345B)GB 5310: 20G, 12Cr1MoV, 12Cr1MoVG, 12CrMoGASTM ...