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HAYNES® Alloys

Oxidation Resistance

Schematic Representation of Metallographic Technique used for Evaluating Oxidation

230schematic

Static Oxidation

HAYNES® HR-120® alloy exhibits good resistance to oxidizing environments and can be used at temperatures up to 2100°F (1150°C).  The following are comparative static oxidation test results at 1600°F (870°C), 1800°F (980°C), 2000°F (1090°C), and 2100°F (1150°C) for 1008 hours.

Alloy 1600°F (870°C) 1800°F (980°C) 2000°F (1090°C) 2100°F (1150°C)
Metal Loss Average Metal Affected Metal Loss Average Metal Affected Metal Loss Average Metal Affected Metal Loss Average Metal Affected
mils mm mils mm mils mm mils mm mils mm mils mm mils mm mils mm
HR‐120® 0.1 0.00 0.9 0.02 0.4 0.01 2.1 0.05 1.0 0.03 4.4 0.11 7.9 0.20 10.1 0.26
253MA 0.2 0.01 0.9 0.02 1.3 0.03 3.0 0.08 0.7 0.02 8.2 0.21 8.7 0.22 16.5 0.42
800HT 0.1 0.00 1.0 0.03 0.5 0.01 4.1 0.10 7.6 0.19 11.6 0.29 11.0 0.28 15.0 0.38
601 - - - - 0.4 0.01 1.7 0.04 1.3 0.03 3.8 0.10 2.8 0.07 6.5 0.17
600 - - - - 0.3 0.01 2.4 0.06 0.9 0.02 3.3 0.08 2.8 0.07 4.8 0.12
RA330 - - - - 0.3 0.01 3.0 0.08 0.8 0.02 6.7 0.17 - - - -
304SS - - - - 5.5 0.14 8.1 0.21 NA NA >19.6 >0.498 NA NA >19.5 >0.498
RA85H - - - - 0.5 0.01 8.3 0.21 3.0 0.08 26.0 0.66 - - - -

Dynamic Oxidation

Burner rig oxidation tests were conducted by exposing samples of 3/8” x 2.5” x thickness (9mm x 64 mm x thickness), in a rotating holder to the products of combustion of 2 parts No. 1 and 1 part No. 2 fuel burned at a ratio of air to fuel of about 50:1. Gas velocity was about 0.3 mach. Samples were automatically removed from the gas stream every 30 minutes and fan-cooled to near ambient temperature and then reinserted into the flame tunnel.  

1800°F/1000-h/2000-Cycles
Alloy Metal Loss Average Metal Affected
mils µm mils µm
556® 3.9 99 6.8 173
HR-120® 6.3 160 8.4 213
RA 330 6.5 165 9.5 241
800H/800HT 8.9 226 13.7 348
310 SS 10.2 259 13.9 353
253MA 14.9 378 16.6 422

Long-term Oxidation

Amount of metal affected for high‐temperature plate (0.25”) alloys exposed for 360 days (8,640 hours) in flowing air.  Cycled once per month.



Alloy		  

Exposure Duration		 1600°F 1800°F 2000°F 2100°F
Metal Loss Average Metal Affected Metal Loss Average Metal Affected Metal Loss Average Metal Affected Metal Loss Average Metal Affected
h number of cycles mils mm mils mm mils mm mils mm mils mm mils mm mils mm mils mm
214® 8640 12 0.1 0.00 0.2 0.01 0.0 0.00 0.0 0.00 0.0 0.00 0.0 0.00 0.0 0.00 0.0 0.00
230® 8640 12 0.2 0.01 1.4 0.04 0.1 0.00 2.5 0.06 3.4 0.09 11.0 0.28 28.5 0.72 34.4 0.87
HR-120® 8640 12 0.3 0.01 1.6 0.04 0.5 0.01 3.3 0.08 18.1 0.46 23.2 0.59 33.6 0.85 44.0 1.12
556® 8640 12 0.3 0.01 1.9 0.05 0.5 0.01 6.2 0.16 15.0 0.38 24.1 0.61 - - - -
617 8640 12 0.3 0.01 1.6 0.04 - - - - - - - - - - - -
800HT 8640 12 0.4 0.01 2.9 0.07 - - - - - - - - - - - -

Water Vapor Testing



Alloy		 1008 hours at 1600ºF Cycled 1x/week in air+10% H2O 1008 hours at 1600ºF Cycled 1x/week in air+20% H2O 6 months at 1400ºF Cycled 1x/week in air+10% H2O
Meal
Loss		 Average
Metal Affected		 Meal
Loss		 Average
Metal Affected		 Meal
Loss		 Average
Metal Affected
mils mm mils mm mils mm mils mm mils mm mils mm
HR-120® 0.09 0.002 0.68 0.017 0.04 0.001 0.29 0.007 0.10 0.003 0.50 0.013
253MA 0.66 0.017 1.59 0.040 0.08 0.002 0.68 0.017 - - - -
347SS 0.86 0.022 1.48 0.038 0.18 0.005 0.88 0.022 0.46 0.012 1.26 0.032
800HT - - - - - - - - 0.12 0.003 0.82 0.021
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