... seamless steel pipe Specification 10.29mm-508mm (1/8''-20'')× 1.2mm-39mm Standard GB, ASTM, API 5L, API 5CT,DIN ... 20ASTM A179, ASTM A192 ASTM SA179,SA192,BS3059Seamless Steel Tubes for high pressure --Chemical fertilizer equipmentGB6479-8610, 20G, Q345 ... steel tubesfor petroleum crackingGB9948-8610, 20, 12CrMo, 15CrMo, 1Cr2Mo, 1Cr5Mo, JIS G3441-1988 1.Specification: API 5L GR.B SSAW steel pipe line pipe ...