Glossary
Materials and construction
Hastelloy
Also known as Hastelloy C276, Hastelloy C22.
Hastelloy (trademark of Haynes International) is a family of nickel-molybdenum-chromium alloys with extreme corrosion resistance in chloride-bearing, acidic and reducing environments. The most common grades for sonic-horn service are Hastelloy C276 and Hastelloy C22.
Where it earns its premium
AISI 316 / 316L handles the majority of industrial sonic-horn corrosion duty. Inconel 625 / 718 handles high-temperature service. Hastelloy is specified where neither suffices — typically:
- Severe chloride environments (some WtE and chemical process duties)
- Wet acidic gas exposure
- Specific chemical-process applications
Hastelloy carries a substantial cost premium (10–15× over 316) and is reserved for cases where lesser materials demonstrably fail.
Related terms
Related terms
- Inconel 625 and 718Inconel 625 and 718 are nickel-based superalloys used for sonic-horn bells and diaphragms in hot-side service above 500 °C, including SCR reactors and recovery boilers.
- AISI 316 and 316L stainless steelAISI 316 / 316L molybdenum-bearing austenitic stainless steel is the workhorse material for industrial sonic-horn bells, diaphragms and mountings in moderate-temperature service.