... alloy steel et ASTM 20# seamless steel pipe for liquid transportation SpecificationsChina StandardSteel GradeStandardseamless steel tubesand pipesfor ... G3454-1998 DIN 1629-1984seamless steel tubeand pipes for casingAPI SPEC 5CTJ55, N80APISeamless steel tubes foroil ... A179, ASTM A192 ASTM SA179,SA192, BS3059Seamless Steel Tubes for high pressure --Chemical fertilizer equipmentGB6479-8610, 20G, Q345, ...