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HAYNES® Alloys

Nitridation Resistance

HAYNES® HR-160® alloy is also very resistant to nitridation attack. Tests were performed in flowing ammonia or nitrogen at various temperatures for 168 hours. Nitrogen absorption was determined by chemical analysis of samples before and after exposure and knowledge of the exposed specimen area.

Ammonia (NH3) 168 hours. Nitrogen Absorption (mg/cm2)

Alloy  1200°F (649°C)  1800°F (982°C)  2000°F (1093°C) 
HR-160®  0.9  2.2  3.0
601 1.1  1.2  2.6
RA330  4.7  3.9  3.1 
800H 4.3  4.0  5.5
304 SS  9.8  7.3  3.5
316 SS 6.9  6.0  3.3 
310 SS  7.4  7.7  9.5 
446 SS  28.8  12.9  4.5 
253 MA  3.3  6.3 

Nitrogen (N2) 2000°F (1093°C), 168 hours 

Alloy  Nitrogen Absoption (mg/cm2
HR-160®  3.9 
601  7.2 
RA330  6.6 
RA85H 8.5 
253 MA 10.0 
800H 10.3 
800HT  11.4 
310 SS  12.3 
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