Super alloy Elgiloy is a cobalt-chromium-nickel alloy, and provides high strength, fatigue life, ductility, and good mechanical properties. It is also corrosion resistant in various environments. It is recommended that forming should be done before heat treatment as heat treatment strengthens the material and makes it more difficult to form.
The following sections will be discussed in detail about super alloy Elgiloy.
Chemical Composition
The chemical composition of super alloy Elgiloy is outlined in the following table.
| Element | Content (%) |
|---|---|
| Cobalt, Co | 39 – 41 |
| Chromium, Cr | 19 – 21 |
| Nickel, Ni | 14 – 16 |
| Iron, Fe | 11.25 – 20.5 |
| Molybdenum, Mo | 6-8 |
| Manganese, Mn | 1.5 – 2.5 |
| Carbon, C | ≤ 0.15 |
| Beryllium, Be | ≤ 0.10 |
Physical Properties
The physical properties of super alloy Elgiloy are tabulated below.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.30 g/cm3 | 0.300 lb/in3 |
| Melting point | 1427°C | 2601°F |
Mechanical Properties
The following table shows mechanical properties of super alloy Elgiloy.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 970 MPa | 141000 psi |
| Yield strength | 480 MPA | 69600 psi |
| Poisson’s ratio | 0.226 | 0.226 |
| Elastic modulus | 189.6 GPa | 27500 ksi |
| Hardness, Brinell | 224 | 224 |
| Hardness, Knoop | 262 | 262 |
| Hardness, Rockwell A | 60 | 60 |
| Hardness, Rockwell B | 97 | 97 |
| Hardness, Rockwell C | 19 | 19 |
| Hardness, Vickers | 230 | 230 |
Thermal Properties
The thermal properties of super alloy Elgiloy are tabulated below.
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient(at 0.000-500°C/32-932°F) | 15.17 µm/m°C | 8.42 µin/in°F |
| Thermal conductivity | 12.5 W/mK | 86.8 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to super alloy Elgiloy are listed below:
- AMS 5833
- AMS 5834
- AMS 5875
- AMS 5876
Applications
Super alloy Elgiloy is used to make springs that are corrosion resistant and exhibit high strength, ductility, and good fatigue life.