The Magnesium Elektron® 21 datasheet provides properties, composition, and processing details for this fully heat‑treatable magnesium casting alloy.
Magnesium Elektron® 21 is a fully heat‑treatable magnesium casting alloy offering excellent corrosion resistance, castability, and machinability. It is used in motorsports and aerospace applications and can be heat‑treated for service up to 400 °F.
The sheet lists physical, mechanical, thermal, electrical, and compositional data, including density, hardness, tensile strength, melting point, coefficient of thermal expansion, and processing parameters such as solution and aging temperatures.
| Density | 1.82 g/cc |
|---|---|
| Hardness (Brinell) | 65 - 75 |
| Typical Tensile Strength (121 °C) | 262 MPa (38 000 psi) |
| Melting Point | 545 – 640 °C (1013 – 1184 °F) |
| Coefficient of Thermal Expansion (CTE) | 26.6 µm/m‑°C |
| Thermal Conductivity | 116 W/m‑K |
| Electrical Resistivity | 9.46 ×10⁻⁶ Ω·cm |
| Maximum Service Temperature (Air) | 204 °C (400 °F) |
The alloy can be used up to 204 °C (400 °F) in air.
Typical tensile strength at 22.2 °C is 262 MPa (38 000 psi).