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. |
| |
|
Average Metal Affected |
|
|
Material |
Mils |
mm |
|
|
|
HAYNES® 188 alloy |
28 |
0.7 |
|
|
HASTELLOY® X alloy |
38 |
1.0 |
|
|
HAYNES® 556® alloy |
42 |
1.1 |
|
|
Type 304 stainless steel |
74 |
1.9 |
|
|
Type 310 stainless steel |
79 |
2.0 |
|
|
Alloy 600 |
94 |
2.4 |
|
|
INCONEL alloy 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). |
| |
|
Maximum Metal Affected |
|
|
Material |
Mils |
μm |
|
|
|
HASTELLOY® X alloy |
3.0 |
75 |
|
|
HAYNES® 556® alloy |
6.0 |
150 |
|
|
HAYNES® 214® alloy |
8.0 |
205 |
|
|
HASTELLOY® S alloy |
9.0 |
230 |
|
|
HAYNES® 188 alloy |
9.0 |
230 |
|
|
Alloy 800H |
11.0 |
280 |
|
|
Type 304 stainless steel |
15.0 |
380 |
|
|
|
Molten Zinc |
| Resistance to molten zinc is an important consideration for structural components in galvanizing operations. Laboratory tests were performed at 850°F (455°C) for 50 hours in molten zinc to determine suitability for such operations. Results are given below: |
| |
Metal Loss* |
Material |
Mils |
μm |
|
HAYNES® 556® alloy |
1.6 |
41 |
HAYNES® 25 alloy |
2.3 |
58 |
| HAYNES® 188 alloy |
2.5 |
64 |
1010 Carbon Steel |
9.2 |
234 |
446 Stainless Steel |
9.3 |
236 |
| *No internal attack noted for any of the alloys tested |
|
| |
Metal Loss* |
Material |
Mils |
μm |
|
Alloy 800H |
11.0 |
280 |
Type 304 stainless steel |
14.1 |
358 |
| HAYNES® 625 alloy |
>24.0** |
>610** |
HASTELLOY® X alloy |
>24.0** |
>610** |
| **dissolved |
|
|
|
|
