H-3057D 25 alloy - Haynes International, Inc.

OXIDATION RESISTANCEComparative Burner Rig Oxidation Resistance at 2000°F (1095°C) for 500 HoursOXIDATION DAMAGE, µm0 100 200 300 400 500 600 700 800 900230 alloyMetalLossMaximumInternalPenetration188 alloyX alloy25 alloy(>25 mils in 165 hours)0 5 10 15 20 25 30 35OXIDATION DAMAGE, MILSSULFIDATION RESISTANCE AT 1400°F (760°C)HAYNES ® 25 alloy has verygood resistance to gaseoussulfidation environmentsencountered in various industrialapplications. Tests wereconducted at 1400°F (760°C)in a gas mixture consisting of5 percent H 2, 5 percent CO,1 percent CO 2, 0.15 percentH 2S and 0.1 percent H 2O,balance Ar. Coupons wereexposed for 215 hours. This isa severe test, with equilibriumsulfur partial pressure of 10 -6 to10 -7 and oxygen partial pressuresless than that needed toproduce protective chromiumoxide scales.Average Metal Affected (Mils)161412108642215 hours @ 1400°F (760°C)Ar-5% H 2-5% CO-1% CO 2-0.15% H 2S-0.1% H 20>29 Mils400300200100Average Metal Affected (µm)0® HR-160 25 188 556 310 617 800H 625 X0HAYNES ® 25 alloy14