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HAYNES® Alloys

High-temperature Corrosion Resistance

Sulfidation in Reducing Atmospheres

Ar-5%H2 -5%CO-1%CO2 -0.15%H2S (Vol. %) (PO2 = 3 x 10-19 atm, PS2 = 0.9 x 10-6 atm) 
sulfidation HR160

1600°F (871°C)/500 hours
Alloy Cobalt Metal Loss Average Depth of Attack Max. Depth of Attack
- % mils mm mils mm mils mm
6B 57 0.3 0.008 3.1 0.08 3.3 0.08
HR-160® 30 0.2 0.005 4.7 0.12 5.2 0.13
25 51 4.1 0.10 8.4 0.21 14.6 0.37
188 39 7.6 0.10 14.9 0.38 23.6 0.60
150 50 10.3 0.26 22.1 0.56 28.3 0.72
556® 18 20.6 0.52 31.9 0.81 35.6 0.90

Sulfidation in Reducing Atmospheres

H-46%CO-0.8%CO-1.7%HS
Alloy 1100°F (593°C) 1300°F (704°C)
- mpy mm/y mpy mm/y
HR-160® 14.4 0.37 27.3 0.70
6B 23.6 0.60 264.4 6.72
150 37.7 0.96 108.8 2.76
25 94.1 2.39 188.5 4.79
188 150.5 3.82 292.6 7.43
556® 121.1 3.08 345.8 8.78

Sulfate-Induced Sulfidation in Combustion Atmospheres

Laboratory Hot Corrosion Burner Rig Testing - Specimens were exposed to a combustion stream generated in a burner rig fired with No. 2 fuel oil with a constant injection of 50 ppm (by weight) salt (mostly sodium chloride) into the combustion stream. Specimens were also subjected to thermal cycling by cycling them out of the test chamber once every hour and rapid fan cooling to less than 390°F (199°C) for two minutes.

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