... steel et ASTM 20# seamless steel pipe for liquid transportation SpecificationsChina StandardSteel GradeStandardseamless steel tubesand pipesfor structural ... FIS G3454-1998 DIN 1629-1984seamless steel tubeand pipes for casingAPI SPEC 5CTJ55, N80APISeamless steel tubes ... in oil wellsAPE SPEC 5LA, B, X42APISeamless Steel Tubesand Pipes forHigh Pressure BoilerGB5310-199520G, 20MnG, 25MnG, 15MoG, 20MoG ...