Reducing & Oxidizing Environments
The alloy combines nickel, chromium, molybdenum and copper to support resistance in a range of chemical environments.
INCOLOY® · Product Details
INCOLOY® Alloy 825
Nickel–Iron–Chromium Alloy · Molybdenum, Copper and Titanium Additions
INCOLOY® alloy 825 is a nickel-iron-chromium alloy with molybdenum, copper and titanium additions. It is used where resistance to a range of reducing and oxidizing environments is important, including selected acid-processing, oil-and-gas and seawater-related applications. Actual performance depends on the process chemistry and operating conditions.
Ni–Fe–Cr–Mo–CuAlloy system
8.14 g/cm³Reference density
1370–1400 °CReference melting range
Key Performance Characteristics
UNS N08825 / W. Nr. 2.4858
Localized Corrosion Resistance
Molybdenum contributes to resistance to pitting and crevice corrosion.
Stabilized Alloy Design
Titanium, with appropriate heat treatment, helps stabilize the alloy against sensitization to intergranular corrosion.
Mechanical Performance
Good mechanical properties are available across cryogenic to moderately high temperatures; cold work can substantially increase strength.
Typical Application Areas
Chemical Processing
Selected process equipment and systems exposed to acids and corrosive solutions.
Oil & Gas Recovery
Selected equipment used in sour-gas and oilfield environments, subject to service review.
Acid Production & Pickling
Selected acid-production and pickling equipment.
Marine & Pollution Control
Selected seawater-related and pollution-control applications.
Chemical Composition
Limiting chemical composition, %
| Element | Composition limit |
|---|---|
| Nickel | 38.0–46.0 |
| Iron | 22.0 min. |
| Chromium | 19.5–23.5 |
| Molybdenum | 2.5–3.5 |
| Copper | 1.5–3.0 |
| Titanium | 0.6–1.2 |
| Carbon | 0.05 max. |
| Manganese | 1.0 max. |
| Sulfur | 0.03 max. |
| Silicon | 0.5 max. |
| Aluminum | 0.2 max. |
Physical Properties
Published reference values
| Property | Reference value |
|---|---|
| Density | 8.14 g/cm³ |
| Melting range | 1370–1400 °C |
| Specific heat | 440 J/(kg·°C) |
Mechanical Properties
Reference data by form and condition
| Product form / condition | Tensile strength | 0.2% yield strength | Elongation |
|---|---|---|---|
| Tubing, annealed | 772 MPa | 441 MPa | 36% |
| Bar, annealed | 690 MPa | 324 MPa | 45% |
| Plate, annealed | 662 MPa | 338 MPa | 45% |
| Sheet, annealed | 758 MPa | 421 MPa | 39% |
Typical room-temperature values for the forms and conditions shown. Cold work, dimensions and the applicable specification affect mechanical properties.
Discuss Your INCOLOY® Alloy 825 Requirements
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Technical reference: Special Metals — INCOLOY® alloy 825 technical bulletin