| Research has shown that
materials which have high
molybdenum content and low
chromium content are generally
superior to other materials in
resisting high-temperature corrosion in fluorine-containing
environments. HAYNES® 242® alloy is in that category,
and displays excellent resistance
to both fluoride gas and
fluoride salt environments. |
Comparative Resistance to 70% HF at 1670°F (910°C) for 136 Hours |
|
Thickness Loss |
| |
|
Alloy |
Mils |
mm |
|
| 242® alloy |
12.6 |
0.3 |
HASTELLOY® S alloy |
15.8 |
0.4 |
HASTELLOY N alloy |
15.8 |
0.4 |
Alloy 625 |
47.2 |
1.2 |
230® alloy |
70.9 |
1.8 |
| C-22® alloy |
78.7 |
2.0 |
| Alloy 600 |
141.7 |
3.6 |
|
Comparative Resistance to KCl-KF-NaF Mixed Salts |
 |
Samples were exposed to a
mixture of KCl-KF-NaF salts for
a total of 40 hours in service.
Temperature was cycled from
1290 to 1650°F (700-900°C)
during the course of the
exposure. |
|
