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Other Environments

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

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:

Alloy Metal Loss*
- mils µm
556® 1.6 41
25 2.3 58
188 64 2.5
1010 Carbon Steel 234 9.2
446 SS 236 9.3

*No internal attack noted for any of the alloys tested

Alloy Metal Loss*
- mils µm
800H 11.0 280
304 SS 14.1 358
625 >24.0** >610**
X >24.0** >610**

**dissolved

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