Chemical Composition of Incoloy 825 Alloy
| Alloy | Content % | Nickel | Chromium | Iron | Carbon | Manganese | Silicon | Copper | Molybdenum | Aluminum | Titanium | Phosphorus | Sulfur |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 825 | Min | 38 | 19.5 | Balance | — | — | — | 1.5 | 2.5 | — | 0.6 | — | — |
| Max | 46 | 23.5 | — | 0.05 | 1 | 0.5 | 3 | 3.5 | 0.2 | 1.2 | 0.03 | 0.03 |
Physical and Mechanical Properties of Incoloy 825 Alloy
Physical Properties
- Density: 8.14 g/cm³
- Melting Point: 1370–1400 ℃
Minimum Mechanical Properties at Room Temperature
| Condition | Tensile Strength Rm (N/mm²) | Yield Strength Rp0.2 (N/mm²) | Elongation A5 (%) | Brinell Hardness HB |
|---|---|---|---|---|
| Solution Annealed | 550 | 220 | 30 | ≤200 |
Characteristics of Incoloy 825 Alloy
- Excellent resistance to stress corrosion cracking.
- Good resistance to pitting corrosion and crevice corrosion.
- Superior resistance to oxidation and non-oxidizing hot acids.
- Excellent mechanical properties at room temperature and elevated temperatures up to 550℃.
- Certified for the manufacture of pressure vessels working at temperatures up to 450℃.
Corrosion Resistance of Incoloy 825 Alloy
Incoloy 825 is a general-purpose engineering alloy with excellent resistance to acids and alkali metal corrosion in both oxidizing and reducing environments.
Its high nickel content provides effective resistance to stress corrosion cracking. It performs well in various media such as sulfuric acid, phosphoric acid, nitric acid, organic acids, as well as alkali solutions including sodium hydroxide, potassium hydroxide and hydrochloric acid.
The alloy delivers outstanding comprehensive performance in nuclear fuel dissolvers with complex corrosive media, where sulfuric acid, nitric acid and sodium hydroxide are processed in the same equipment.
Applications of Incoloy 825 Alloy
Incoloy 825 is widely used in industrial fields with service temperatures not exceeding 550℃.
Typical Applications:
- Heating tubes, containers, baskets and chains for sulfuric acid pickling plants
- Seawater-cooled heat exchangers, marine piping systems, sour gas service pipelines
- Heat exchangers, evaporators, scrubbers and immersion tubes in phosphoric acid production
- Air heat exchangers in petroleum refining
- Food engineering and chemical processing industries
- Flame-retardant alloy for high-pressure oxygen service