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Alloy 825 Technical Overview
Inconel 825 (UNS N08825) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The alloy's chemical composition is designed to provide exceptional resistance to many corrosive environments. The nickel content is sufficient for resistance to chloride-ion stress-corrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives outstanding resistance to reducing environments such as those containing sulfuric and phosphoric acids. Alloy 825 is also resistant to pitting and crevice corrosion. Steel Emporium stocks Grade 825 pipes and tubes in various schedules to serve chemical, oil, and gas industries worldwide.
Key Material Advantages
Acid Resistance
Superb resistance to sulfuric, phosphoric, and nitric acids across various concentrations.
SCC Immunity
The high nickel content provides excellent resistance to chloride stress-corrosion cracking.
Localized Corrosion
Exceptional resistance to pitting and crevice corrosion in seawater and chemical plants.
| Grade | Ni | Fe | Cr | Mo | Cu | Ti | C | Mn | Si | S |
|---|---|---|---|---|---|---|---|---|---|---|
| Inconel 825 | 38.0 - 46.0 | 22.0 min | 19.5 - 23.5 | 2.5 - 3.5 | 1.5 - 3.0 | 0.6 - 1.2 | 0.05 max | 1.0 max | 0.5 max | 0.03 max |
| Property | Metric Value | Imperial Value |
|---|---|---|
| Tensile Strength (MPa) | 585 MPa | 85,000 psi |
| Yield Strength (0.2% offset) | 240 MPa | 35,000 psi |
| Elongation (% in 50mm) | 30% min | 30% min |
| Hardness (Rockwell B) | 75 - 90 HRB | - |
| Property | Value |
|---|---|
| Density | 8.14 g/cm³ (0.294 lb/in³) |
| Melting Range | 1370 - 1400 °C (2500 - 2550 °F) |
| Specific Heat | 440 J/kg·°C (0.105 Btu/lb·°F) |
| Thermal Conductivity (20°C) | 11.1 W/m·°C |
| Standard | UNS Number | Werkstoff No. | EN Name | Common Name |
|---|---|---|---|---|
| Alloy 825 | N08825 | 2.4858 | NiCr21Mo | Inconel 825 |
| Nominal Size (NB) | OD (mm) | SCH 10 | SCH 40 | SCH 80 |
|---|---|---|---|---|
| 1/2" | 21.34 | 1.29 | 1.65 | 2.15 |
| 1" | 33.40 | 2.12 | 3.28 | 4.29 |
| 2" | 60.33 | 3.98 | 5.52 | 7.59 |
| 3" | 88.90 | 6.81 | 11.47 | 15.51 |
| 4" | 114.30 | 11.19 | 16.31 | 22.65 |
Industrial Applications
Chemical Processing
Equipment for phosphoric and sulfuric acid production.
Oil & Gas Recovery
Downhole tubing and sour gas production components.
Pollution Control
Flue gas desulfurization (FGD) scrubbers and chimney liners.
Nuclear Fuel
Reprocessing of nuclear fuel elements.
Acid Pickling
Heating coils, tanks, and pickling baskets.
Food Processing
Equipment in contact with hot acetic and citric acids.