Abstract
Difficulties of alloy selection for high-temperature halogen service are described with reference to product morphologies, vaporization and the manner by which alloy degradation may occur. Selected results from work with alloy 600 (Ni-16 Cr-8Fe) and Havnes® Alloy 230 (Ni-22 Cr-14W-2Mo-0.3Al-0.02 La) are used to contrast various modes of attack. Oxidizing chlorine-containing gases often give rise to heavy volatilization and intergranular attack at 900°C (1650°F) whilst HF/steam mixtures result in more uniform internal oxidation at 750°C (1380°F).
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