Alloy 825 - 2.4858
Wst. 2.4858
UNS N08825
Stock program: 3 – 25 mm OD / 1/16’’ – 1’’ OD
Specification: ASTM B 163/ ASTM B 423/ASTM B 829 / NACE MR0175/ISO 15156-3
Maximum service temperature: 550°C / 1020°F
Alloy 825 is an austenitic nickel-iron-chromium alloy with additions of copper, molybdenum and titanium. The alloy's chemical composition is designed to provide exceptional corrosion resistance in both oxidizing and reducing environments. The nickel content is sufficient for resistance to chloride-ion stress corrosion cracking and the molybdenum also aids resistance to pitting and crevice corrosion. The addition of titanium stabilized the alloy 825 against sensitization and inter granular corrosion. The resistance of alloy 825 to general and localized corrosion under diverse conditions gives the alloy broad usefulness.
Characteristics
- Exceptional resistance to many corrosive environments
- Very good resistance to sulfuric and phosphoric acids
- Good mechanical properties from moderate to high temperatures
- Good formability and weldability
- Good resistance to stress-corrosion cracking and pitting
Market applications:
- Chemical process equipment
- Oil and Gas well tubing
- Chemical infection lines
- Acid production
- Down hole control lines
Technical details
| Technical composition (%) | Fe | Cr | Ni | Mo | Mn | Cu | Si | P | C | S | Ti | Al | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 825 | min | 22.0 | 19.5 | 38.0 | 2.5 | - | 1.5 | - | - | - | - | 0.60 | - |
| max | - | 23.5 | 46.0 | 3.5 | 1.00 | 3.0 | 0.50 | 0.030 | 0.05 | 0.030 | 1.20 | 0.20 |
| Mechanical properties | 825 |
|---|---|
| Tensile strenght (mpa, min) | 590 |
| Yield strength (0.2% offset mpa, min) | 240 |
| Elongation (%, min) | 30 |
| Density / weight (g / cm3 / kg) | 8.14 |