... grades & sizes of stainless steel pipe Product NameExecutiveDimensionSteel Code / Steel GradeSeamless Austenitic Stainless Steel PipesASTM A312, A312MASME SA312 ... TP321, TP321H, TP347, TP347HSeamless Austenitic Stainless Steel Tubing for General ServiceASTM A269ASME SA269OD: 6.0 ... TP317L, TP321, TP321H, TP347, TP347HSeamless Austenitic Alloy-Steel Boiler, Super Heater and Heat-Exchanger TubesASTM A213 ...