HAYNES® 556™ alloy - Haynes International, Inc.

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SULFIDATION RESISTANCEHAYNES ® 556 alloy is secondin resistance only to HAYNESHR-160 ® alloy to the types ofsulfur-bearing environments thatare present in many hightemperatureindustrial processes.This is due partly to itscomparatively low nickel contentcoupled with the importantaddition of cobalt, the highchromium level, and the carefullybalanced minor elements.For comparison, data illustratingthe relative sulfidation resistanceof INCONEL ® alloy 601,HASTELLOY ® X alloy, alloys600 and 800H, and Type 310stainless steel are shown in theaccompanying photomicrographs.556 alloy had littlesulfide penetration or wastageafter 215 hours of exposure inan Ar+5%H 2+5%CO+1%CO 2+0.15%H 2S+0.1%H 2O test gas at1800°F (980°C). By contrast,alloys such as INCONEL alloy601 were completely destroyed,while other materials sufferedsevere wastage and sulfidepenetration or pitting.Comparative Sulfidation Resistance at 1800°F (980°C) for 215 Hours(Width of Micros Indicates Original Sample Thickness)46983 4700647021HAYNES 556 alloyAverage Metal Affected =2.0 Mils (50 µm)/SideType 310 stainless steelAverage Metal Affected =7.4 Mils (190 µm)/SideAlloy 800HAverage Metal Affected =23.2 Mils (590 µm)/Side4717547031 47172HASTELLOY X alloyAverage Metal Affected =>22 Mils (560 µm)/SideINCONEL alloy 601Average Metal Affected =>22 Mils (560 µm)/SideAlloy 600Average Metal Affected =>22 Mils (560 µm)/SideSulfidation Resistance at Other TemperaturesMaterialHR-160 ® alloy556 alloyType 310alloy 800HX alloyalloy 600alloy 6011400°F (760°C)*Metal Loss Average Metal Affected**Mils µm Mils µm0.2 5 1.1 302.5 65 3.8 956.2 155 9.1 2307.1 180 11.2 285>29.5 >750 Perforated>21.7 >560 Perforated>29.5 >750 Perforated1600°F (871°C)*Metal Loss Average Metal AffectedMils µm Mils µm0.1 3 3.8 955.2 130 11.7 2959.5 240 13.5 34511.7 295 19.2 490>21.7 >550 Consumed>21.7 >550 Consumed>21.7 >550 Perforated*215 Hour Exposure in Ar+5% H 2+5%CO+1% CO 2+0.15%H 2S+0.10%H 2O**Metal Loss + Average Internal PenetrationHAYNES ® 556 TM alloy 4
Field Experience - Municipal Waste IncineratorSamples were exposed for 950hours in the superheater sectionof a municipal waste incinerator.Combustion gas temperatureswere about 1475°F (800°C) withexcursions to 1740°F (950°C).The mode of corrosion observedwas oxidation/sulfidation, althoughalkali chloride compoundswere known to be present.HAYNES ® 556 alloy was foundto be one of the best alloys forresisting this highly corrosiveenvironment.Maximum Metal Affected (mm)0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9HAYNES 188 alloyHAYNES 556 alloyINCOLEL alloy 617Type 309 stainless steelHASTELLOY X alloy5 10 15 20 25 30 35Maximum Metal Affected (mils)Field Experience - Aluminum Remelting FurnaceSamples of tubing were exposedfor 1150 hours in the recuperatorof an aluminum remelting furnaceproducing 1250°F (675°C) fluegases. The tube samples wereinternally cooled by combustionpreheat air the same as theoperating recuperator tubes. Themode of corrosion observed wascombined attack by alkali sulfatesand chlorides together withoxidation. HAYNES 556 alloyexhibited outstanding resistanceto corrosion in this environment.Maximum Metal Affected (mm)0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9HAYNES 556 alloy625 alloyHASTELLOY X alloyType 310 stainlessType 316 stainlessType 304 stainless5 10 15 20 25 30 35Maximum Metal Affected (mils)5HAYNES ® 556 TM alloy
Page 1 and 2: HIGH-TEMPERATURE ALLOYSHAYNES ® 55
Page 3: PRINCIPAL FEATURESHigh Strength and
Page 7 and 8: Comparative 1700°F (925°C) Mix Ga
Page 9 and 10: OXIDATION RESISTANCEHAYNES ® 556 a
Page 11 and 12: APPLICATIONSThis high-temperature f
Page 13 and 14: OTHER HIGH TEMPERATURE ENVIRONMENTS
Page 15 and 16: Typical Physical Properties (contin
Page 17 and 18: TYPICAL TENSILE PROPERTIESCold-Roll
Page 19 and 20: TYPICAL CREEP AND STRESS-RUPTURE PR
Page 21 and 22: Thermal Stability (continued)Room-T
Page 23 and 24: Fabrication Characteristics (contin
Page 25 and 26: Manual Gas Tungsten Arc WeldingV-or
Page 27 and 28: MACHININGHAYNES ® 556 alloy is sim

HAYNES® 556™ alloy - Haynes International, Inc.

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