ASTM standard flange 1.Material:carbon steel, 2.size:1/2"-24" 3 ... ,64,100,160 ETC. Available with NACE MR 01-75 material stainless steel , carbon steel , nickel alloy ,cast iron , ... in the region of the butt weld joining them to the pipe. The long tapered hub provides an ... produces an endurance strength of welding neck flanged assemblies equivalent to that of a butt welded joint between pipes, which ...