ASTM 20# seamless steel pipe for liquid transportation 1-standards:ASTM,GB,DIN,JIS.etc 2-material: ... steel, alloy steel et ASTM 20# seamless steel pipe for liquid transportation SpecificationsChina StandardSteel GradeStandardseamless steel tubesand pipesfor structural purposeGB/T8162 ... Fax:0086-317-5299288 ASTM 20# seamless steel pipe for liquid transportation