... 1.2mm-39mm Standard GB, ASTM, API 5L, API 5CT,DIN, JIS and so on Out ... SPEC 5CTJ55, N80APISeamless steel tubes foroil casing andtubing in oil wellsAPE SPEC 5LA, B ... ASTM A192 ASTM SA179,SA192,BS3059Seamless Steel Tubes for high pressure --Chemical fertilizer equipmentGB6479-8610, 20G, ... 12Cr2MoISO 9329-2-1997 ASTM A161-94Seamless steel tubesfor petroleum crackingGB9948-8610, 20, 12CrMo, 15CrMo, 1Cr2Mo, ...