... , A179, API 5L, Seamless Carbon Steel Pipecarbon steel seamless & welded pipe.c Specification: ASTM A53, A106, A179, API 5L, BS1387... Surface ... end; with / without caps on ends ASTM A53: (black or galvanized) Grade: Gr. A, Gr. B Size range: OD 1/2" ~ 8" (23.1 ... /2" ~ 14" (23.1 ~ 355.6mm ) X WT Sch30 ~STD ~ Sch160 High quality, multi-specification, low price, quick delivery. seamless steel pipe ...