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Sulfidation Resistance

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.

25 Sulfidation

Schematic Representation of Metallographic Technique Used for Evaluating Environmental Tests

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