... 98 JIS G3441-1994 JIS G3444-1994Seamless steel tubes and pipes forliquid serviceGB/T8163-199910, 20, Q295, Q345ASTM A53 ... 1998 FIS G3454-1998 DIN 1629-1984seamless steel tubeand pipes for casingAPI SPEC 5CTJ55, N80APISeamless steel tubes foroil casing andtubing ... in oil wellsAPE SPEC 5LA, B, X42APISeamless Steel Tubesand Pipes forHigh Pressure BoilerGB5310-199520G, 20MnG, 25MnG, 15MoG, 20MoG, ...