... ,API SPEC 5 3PE coating steel pipe SpecificationsChina StandardSteel GradeStandardseamless steel tubesand pipesfor structural purpose GB/T8162 ... 20ASTM A179, ASTM A192ASTM SA179,SA192,BS3059Seamless Steel Tubes for high pressure --Chemical fertilizer equipmentGB6479-8610 ... 12CrMo, 15CrMo, 12Cr2MoISO 9329-2-1997ASTM A161-94Seamless steel tubesfor petroleum crackingGB9948-8610, 20, 12CrMo, 15CrMo, ...