Incoloy® is a trademark applied to a family of nickel-iron-chromium alloys. The name is so well recognised that it is used generically to describe such alloys, even when they are produced by another manufacturer.
The most widely recognised Incoloy alloys are Alloy 825 (Incoloy 825, UNS N08825, 2.4858) and Alloy 925 (Incoloy 925, UNS N09925), the latter a higher-strength alloy. Alloy 825 is widely used in valve components, while Alloy 925 is used in a variety of oil and gas tooling as a lower-cost alternative to Alloy 718 (Inconel® 718, UNS N07718, 2.4668).
Incoloy properties and advantages
Incoloy alloys are based on a nickel-iron-chromium composition, which gives good strength and excellent resistance to carburisation and oxidation at high temperatures. Their advantages include:
- Good corrosion resistance in a number of acidic environments
- High creep rupture strength
- Good resistance to many sulphur-bearing atmospheres
- High-temperature strength
| Grade | Trade name | UNS |
|---|---|---|
| Alloy 825 | Incoloy 825 | N08825 |
| Alloy 925 | Incoloy 925 | N09925 |