ALLOYS
Alloy 825
Alloy 825, commonly known as INCOLOY® 825, is a nickel-iron- chromium alloy with additions of molybdenum and copper. It is similar to alloy 800 but has improved resistance to aqueous corrosion. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. Alloy 825 is especially resistant to sulfuric and phosphoric acids. This nickel steel alloy is used for chemical processing, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production, and pickling equipment.
UNS: N08825
Stock Sizes: 1/8” – 1” OD
Specifications:
- Seamless Tube: ASTM B163/B423
- NACE MR0175/MR0103
Available Processing:
- Cold Worked and Bright Annealed
Common Testing: Eddy Current, Flare, Flattening, Positive Material Identification
Chemical Composition (%)
| Chemical | Percentage |
|---|---|
| Iron (Fe) | 22% Min |
| Chromium (Cr) | 19.5-23.5% |
| Nickel (Ni) | 38-46% |
| Manganese (Mn) | 1% Max |
| Silicon (Si) | 0.5% Max |
| Copper (Cu) | 1.5-3.0% |
| Carbon (C) | 0.05% Max |
| Sulfur (S) | 0.03% Max |
| Chemical | Percentage |
|---|---|
| Aluminum (Al) | 0.2% Max |
| Titanium (Ti) | 0.6-1.2% |
| Molybdenum (Mo) | 2.5-3.5% |
| – | – |
| – | – |
| – | – |
| – | – |
| – | – |
Physical Properties
| Property | Measurement |
|---|---|
| Density (lb/in3) | 0.294 |
| Elongation (min %) | 30 |
| Minimum Yield (psi) | 35,000 |
| Minimum Tensile (psi) | 85,000 |
| Max Hardness (HRB) | 90 |