... seamless & welded pipe.c Specification: ASTM A53, A106, A179, API 5L, Seamless Carbon Steel Pipecarbon steel seamless & welded pipe.c Specification ... : ASTM A53, A106, A179, API 5L, BS1387... Surface: Black, black varnish coating, zinc-coating, End type ... ~ 127.0mm) X WT BWG20 ~ BWG10 (0.91 ~ 3.4mm) API 5L: Grade: Gr. A, Gr. B, X42...etc. Size range: OD ...