... / A249M:Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes. the equivalent specifications of EN, DIN ... TP347H,UNS31803, UNS32205, UNS32750, UNS32760,N904L and Equivalent Steel Grade in EN, DIN and JIS Specification.Size Range:Production Outside Diameter ... Wooden case, and each end of tubes be protected by plastic caps. S.S Heat Exchanger Tube