... , black print, oil or zinc MaterialCarbon steel: 20#, 16Mn, ASTM A105,Q235,A350LF2, A350LF3,Stainless steel:ASTM A182 F304, F304L,F316,F316L, F317L ... A182, F43,S32750Line Pipe: ASTM A694 F42,F46,F52,F56,F60,F65,F70, Low Alloy steel: A182 F12,F11,F22,F5 ... cases,or according to the customers' requirementsCertificatesISO, API♥We are manufacturer of steel pipe&fittings, like 45deg/90deg/180deg elbow,equal ...