... A519-98 JIS G3441-1994 JIS G3444-1994Seamless steel tubes and pipes forliquid serviceGB/T8163-199910, 20, Q295, Q345ASTM A53 ... N80APISeamless steel tubes foroil casing andtubing in oil wellsAPE SPEC 5LA, B, X42APISeamles Steel Tubesand Pipes forHigh Pressure ... 20ASTM A179, ASTM A192 ASTM SA179,SA192, BS3059Seamless Steel Tubes for high pressure --Chemical fertilizer equipmentGB6479-8610, 20G, ...