... , JIS, GB, DIN BG 24" and 20" ERW PIPE SpecificationsChina StandardSteel GradeStandardseamless steel tubesand pipesfor structural purpose GB ... steel tubesand pipesfor casingAPI SPEC 5CTJ55, N80APISeamless steel tubes foroil casing andtubing in oil wellsAPE SPEC 5LA, ... , 20ASTM A179, ASTM A192ASTM SA179,SA192,BS3059Seamless Steel Tubes for high pressure --Chemical fertilizer equipmentGB6479-8610, 20G, ...