HAYNES® 188 alloy has very good resistance to gaseous sulfidation envronments encountered in various industrial applications. Tests were conducted at 1400°F (760°C) in a gas mixture consisting of 5 percent H2, 5 percent CO1, 1 percent CO2 , and 0.15 percent 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.
Sulfidation Resistance at 1400°F (760°C)