ASTM 20# seamless steel pipe for liquid transportation 1-standards:ASTM,GB,DIN,JIS ... alloy steel et ASTM 20# seamless steel pipe for liquid transportation SpecificationsChina StandardSteel GradeStandardseamless steel tubesand pipesfor structural purposeGB ... ASTM SA179,SA192, BS3059Seamless Steel Tubes for high pressure --Chemical fertilizer equipmentGB6479-8610, 20G, Q345, Q390, 10MoVNb, 12CrMo, 15CrMo ...