ANSON STEEL produces and supplies ASTM A312 products in welded and seamless tubes and pipes. Stainless steel pipe ASTM A312 has 4 main grades TP304/304L, TP316/316L. TP304/TP304L and TP347 are included in ASME pressure vessel code and the Chemical Plant and Renery Piping Code, These steel tubes are safe to be used in temperatures as low as ASTM A312 Stainless Steel Pipe SpecificationASTM A312 Stainless Steel Pipe Specification Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes ASTM A312 pipe is common use stainless pipe for industries. It covers diameters from 1/8 to 30 and thickness from SCH 10S to SCH 80S. General use material grades are TP304/304L, TP316/316L.