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HAYNES® Alloys

Hot Corrosion Resistance

HAYNES® 188 alloy exhibits excellent resistance to sulfate deposit type hot corrosion. Tests were conducted in a low velocity burner rig burning No. 2 Fuel oil with 0.4 percent sulfur. The air:fuel ratio was 30:1. Artificial sea water was injected at a rate equivalent to 5 ppm salt. Tests were run for 1000 hours, with samples cycled out of the gas stream once an hour and cooled to near ambient temperature. Gas velocity was 13 ft./ sec. (4 m/s).

Hot Corrosion Resistance at 1650°F (900°C)

Alloy Metal Loss Average Metal Affected
- mils µm mils µm
188 0.8 20 2.7 69
230® 1.2 30 5.1 130
625 1.8 46 5.2 132
X 1.6 41 5.5 140

Schematic Representation of Metallographic Technique
Used for Evaluating Environmental Tests

188 Sulfidation

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