ASTM 20# seamless steel pipe for liquid transportation 1-standards:ASTM,GB,DIN,JIS.etc ... alloy steel et ASTM 20# seamless steel pipe for liquid transportation SpecificationsChina StandardSteel GradeStandardseamless steel tubesand pipesfor structural purposeGB/ ... A179, ASTM A192 ASTM SA179,SA192, BS3059Seamless Steel Tubes for high pressure --Chemical fertilizer equipmentGB6479-8610, 20G, Q345, Q390, ...