... Alloy-Steel Boiler, Superheater and Stainless Steel Heat Exchanger Tubes.ASTM A249 / A249M:Standard Specification for Welded Austenitic ... Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes. the equivalent specifications of EN, DIN ,GOST and ... Final FinishingSolution Annealed & Pickled/Bright Annealed.Type of Tubes:U-bend & Straight.Packing:Wooden case, and each end of ...