Inconel 725
Material Data Sheet
Inconel® alloy 725 (UNS N07725) is a nickel- chromium-molybdenum-niobium alloy that is highly resistant to corrosion and is age hardenable for extremely high strength. It has essentially the same corrosion resistance as INCONEL® alloy 625, which is widely used in a broad range of severely corrosive environments. The strength of age-hardened INCONEL® alloy 725 is of the order of twice that of annealed alloy 625. Because the strength of alloy 725 is developed by heat treatment, not by cold work, ductility and toughness remain high. Also, strength can be imparted to large or non-uniform sections that cannot be strengthened by cold work.
Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel, Ni | 57.0 |
| Chromium, Cr | 20.75 |
| Iron,Fe | 8.3 |
| Molybdenum, Mo | 8.25 |
| Niobium, Nb | 3.4 |
| Titanium, Ti | 1.3 |
| Aluminum, Al | 0.35 |
| Manganese, Mg | 0.35 |
| Carbon, C | 0.03 |
| Silicon, Si | 0.20 |
Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.30 g/cc | 0.300 lb/in³ | Melting Point | 1271 – 1343 °C | 2320 – 2449 °F |
Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Hardness, Rockwell C | 36 | 36 | Tensile Strength, Ultimate | 1240 MPa | 180000 psi |
| Tensile Strength, Yield | 903 MPa | 131000 psi |
| Elongation at Break | 30% | 30% |
| Modulus of Elasticity | 204 GPa | 29600 ksi |
| Poissons Ratio | 0.31 | 0.31 |
| Shear Modulus | 78.0 GPa | 11300 ksi |
| Charpy Impact | 65.0 J | 47.9 ft-lb |
Applications
- Downhole equipment for corrosive/sour service
- Oil and gas hangers, connectors
- Fasteners, especially in marine applications
- Chemical process equipment
- Agitators
- Valve stems
Key Words:IN725, inco 725, inco-725, inconel-725, INCONEL 725,
