... , 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: plain end, beveled end; with / without caps on ends ASTM A53: (black or ... High quality, multi-specification, low price, quick delivery. seamless steel pipe