STANDARD STEEL GRADE APPLICATION API 5CT J55,K55,N80,L80,P110 Specification for Casing and Tubing API 5L A,B,X42/X46/X52/X56 Specification for Line Pipe ASTM A53 GR.A / GR.B Black Steel Pipe ASTM A106 GR.A / GR.B Seamless Carbon Steel For High Temperature Service ASTM A179 LOW CARBON STEEL Seamless Cold-Drawn Low-Carbon Steel Heat Exchanger And Condenser Tubes Available Length: Random of 5-14m, we also can process the fixed 5.8m or 11.8m length.