... , Varnish, Passivation, Phosphating, Shot Blasting2.Carbon Alloy Tube Application:Boiler, Superheater and Heat-ExchangerProduction Standard, Steel NO:ASTM A213 T11, T12, T22, T5 ... , Varnish, Passivation, Phosphating, Shot Blasting. 4.Boiler Tube Application:For high, middle, low pressure boiler and pressure purposeProduction Standard, Grade, Steel No:ASTM A178 Grade A, C, DASTM ...