Sulfidation Resistance at 1400°F (760°C)
HAYNES® 25 alloy has very good resistance to gaseous sulfidation environments encountered in various industrial
applications. Tests were conducted at 1400°F (760°C) in a gas mixture consisting of AR – 5% H2 – 5% CO – 1% CO2 – 0.15% H2S, balance Ar. Coupons were exposed for 215 hours. This is a severe test, with equilibrium sulfur partial pressure of 10-6 to 10-7 and oxygen partial pressures less than that needed to produce protective chromium oxide scales.