Incoloy® 825 is a Nickel-Iron-Chromium alloy with additions of Molybdenum and Copper. It has excellent resistance to both reducing and oxidising acids, to stress-corrosion cracking and to localised pitting and crevice corrosion. It is also especially resistant to sulphuric and phosphoric acids.
Incoloy® 825 is also known as Nicrofer 4221, Superimphy 82 and Ferrochronin 825.
| Chemical Composition | Specifications | Designations | Key Features | Typical Applications | |||||||||||||||||||||||||||||||||||||||
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ASTM B425 BS 3075 NA 16 BS 3076 NA 16 ISO 15156-3 (NACE MR 0175) |
W.Nr 2.4858 UNS N08825 AWS 022 |
Resistant to reducing environments such as those containing sulphuric and phosphoric acids Resistant to a variety of oxidising substances such as nitric acid and nitrates Resistant to chloride-ion stress corrosion cracking and, pitting & crevice corrosion Good for chemical processing |
Chemical Processing Nuclear Fuel Reprocessing Acid Production Pickling Equipment |
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| Density | 8.14 g/cm³ | 0.294 lb/in³ |
| Melting Point | 1400°C | 2550°F |
| Coefficient of Expansion | 14.0 μm/m °C (20 – 100°C) | 7.8 x 10-6 in/in °F (70 – 212°F) |
| Modulus of Rigidity | 75.9 kN/mm² | 11009 ksi |
| Modulus of Elasticity | 196 kN/mm² | 28428 ksi |
| Heat Treatment of Finished Parts | |||||
|---|---|---|---|---|---|
| Condition as supplied by Alloy Wire | Type | Temperature | Time (Hr) | Cooling | |
| °C | °F | ||||
| Annealed or Spring Temper | Stress Relieve | 450 – 470 | 840 – 880 | 0.5 – 1 | Air |
| Properties | ||||
|---|---|---|---|---|
| Condition | Approx. tensile strength | Approx. operating temperature | ||
| N/mm² | ksi | °C | °F | |
| Annealed | 600 – 800 | 87 – 116 | -100 to +250 | -145 to +480 |
| Spring Temper | 800 – 1100 | 116 – 159 | -100 to +250 | -145 to +480 |
The above tensile strength ranges are typical. If you require different please ask.
*Trade name of Special Metals Group of Companies
