Molten Chloride Salts
HAYNES® 556® alloy exhibits reasonable resistance to neutral NaCl-KCl-BaCl2 type heat-treating salts at temperatures up to 1550°F (845°C) based upon actual field tests in a molten salt pot heat treating facility. Coupons were exposed for 30 days.
| Alloy |
Average Metal Affected |
| - |
mils |
mm |
| 188 |
28 |
0.7 |
| X |
38 |
1.0 |
| 556® |
42 |
1.1 |
| 304 SS |
74 |
1.9 |
| 310 SS |
79 |
2.0 |
| 600 |
94 |
2.4 |
| INCONEL® 601 |
115 |
2.9 |
Phosphorus-Bearing Combustion Environment
Based upon field tests performed in the combustion chamber of a fluid bed dryer used to dry sodium tripolyphosphate compounds, HAYNES® 556® alloy exhibits very good resistance to corrosion caused by formation of low-melting point eutectics involving phosphorus. Samples were exposed 30 days at a temperature of about 1475°F (800°C).
| Alloy |
Maximum Metal Affected |
| - |
mils |
µm |
| X |
3.0 |
75 |
| 556® |
6.0 |
150 |
| 214® |
8.0 |
205 |
| S |
9.0 |
230 |
| 188 |
9.0 |
230 |
| 800H |
11.0 |
280 |
| 304 SS |
15.0 |
380 |