Glossary
Materials and construction
Inconel 625 and 718
Also known as Inconel 625, Inconel 718, alloy 625, alloy 718.
Inconel 625 and Inconel 718 are nickel-based superalloys (trademarks of Special Metals Corporation) used for industrial sonic horn bells and diaphragms in hot-side service above ~500 °C continuous temperature, where AISI 316 would lose mechanical strength.
Properties
| Property | Inconel 625 | Inconel 718 |
|---|---|---|
| Composition | Ni-Cr-Mo-Nb | Ni-Cr-Fe with age-hardening |
| Continuous service | up to ~980 °C | up to ~700 °C |
| Strength | High at moderate temp | Highest at moderate-high temp |
| Cost vs 316 | 5–10× | 4–8× |
| Best application | Sustained high-temp duty | Strength-critical components |
Where Inconel is specified
- Hot-side ESP penthouses (300–400 °C continuous)
- SCR reactor horn installations (300–400 °C)
- Recovery-boiler superheater area
- Cement kiln-inlet horns
- Some WtE high-chloride hot zones
Related terms
Related terms
- 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.
- HastelloyHastelloy (C276, C22) is a family of nickel-molybdenum-chromium alloys with extreme corrosion resistance. Specified for sonic horns in severe chloride-bearing or acidic service.
- Bell hornA bell horn is the conical or exponential flare that amplifies and projects sound from an industrial sonic horn's driver into the vessel being cleaned.
- Diaphragm hornA diaphragm horn is a sonic horn whose sound is generated by a vibrating titanium or stainless-steel diaphragm driven by pulsed compressed air. The dominant form-factor for low-frequency industrial cleaning.