HAYNES® 556™ alloy - Haynes International, Inc.

OTHER HIGH TEMPERATURE ENVIRONMENTSMolten Chloride SaltsMaterialHAYNES 188 alloyHASTELLOY X alloyHAYNES 556 alloyType 304 stainless steelType 310 stainless steelAlloy 600INCONEL alloy 601HAYNES ® 556 alloy exhibitsreasonable resistance to neutralNaCl-KCl-BaCl 2-type heattreatingsalts at temperaturesup to 1550°F (845°C) basedupon actual field tests in amolten salt pot heat treatingfacility. Coupons were exposedfor 30 days.Average Metal AffectedMils mm28 0.738 1.042 1.174 1.979 2.094 2.4115 2.9Phosphorus-Bearing Combustion EnvironmentMaterialHASTELLOY X alloyHAYNES 556 alloyHAYNES 214 alloyHASTELLOY S alloyHAYNES 188 alloyAlloy 800HType 304 stainless steelBased upon field tests performedin the combustionchamber of a fluid bed dryerused to dry sodium tripolyphosphatecompounds, HAYNES556 alloy exhibits very goodresistance to corrosion causedby formation of low-meltingpoint eutectics involving phosphorus.Samples were exposed30 days at a temperatureof about 1475°F (800°C).Maximum Metal AffectedMils µm3.0 756.0 1508.0 2059.0 2309.0 23011.0 28015.0 380Molten ZincResistance to molten zinc is animportant consideration forstructural components ingalvanizing operations. Laboratorytests were performed at850°F (455°C) for 50 hours inmolten zinc to determinesuitability for such operations.Results are given below:MaterialHAYNES 556 alloyHAYNES 25 alloyHAYNES 188 alloy1010 Carbon Steel446 Stainless SteelMetal Loss* mils (µm)1.6 412.3 582.5 649.2 2349.3 236MaterialAlloy 800H304 Stainless SteelHAYNES 625 alloyHASTELLOY X alloy**dissolvedMetal Loss* mils (µm)11.0 28014.1 358>24.0** >610**>24.0** >610***no internal attack noted for any of the alloys tested13HAYNES ® 556 TM alloy