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Nitriding Resistance

HAYNES® 230® alloy is one of the most nitriding resistant materials commercially available. Tests were performed in flowing ammonia at 1200°F (650°C) and 1800°F (980°C) for 168 hours. Nitrogen absorption was determined by chemical analysis of samples before and after exposure and knowledge of the exposed specimen area.

Alloy Nitrogen Absorption (mg/cm2)
1200°F (649°C) 1800°F (982°C) 2000°F (1093°C)
230® 0.7 1.4 1.5
600 0.8 0.9 0.3
625 0.8 2.5 3.3
X 1.7 3.2 3.8
RA330® - 3.9 3.1
800H 4.3 4.0 5.5
316 SS 6.9 6.0 3.3
310 SS 7.4 7.7 9.5
304 SS 9.8 7.3 3.5
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