1.api 5l x52 black steel pipe line 2.API certificate 3.NDT,UT,ET, hydro tests ... / Heat exchange pipeMechanical steel pupeSeamless Alloy steel tubeapi 5l x52 black steel pipe line Outer Diamter: 3/8" to 42" (16 - 426mm ... cut). or beveled ends Surface: Lightly oiled, Hot dip galvanized, Black, Varnish coating, PE,3PE Coatings Packing: plastic /metal caps protection ...