AZ81A Magnesium vs. AISI 202 Stainless Steel
AZ81A magnesium belongs to the magnesium alloys classification, while AISI 202 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is AZ81A magnesium and the bottom bar is AISI 202 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 55 | |
| 210 to 300 |
| Elastic (Young's, Tensile) Modulus, GPa | 46 | |
| 200 |
| Elongation at Break, % | 3.0 to 8.8 | |
| 14 to 45 |
| Fatigue Strength, MPa | 78 to 80 | |
| 290 to 330 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 18 | |
| 77 |
| Shear Strength, MPa | 91 to 130 | |
| 490 to 590 |
| Tensile Strength: Ultimate (UTS), MPa | 160 to 240 | |
| 700 to 980 |
| Tensile Strength: Yield (Proof), MPa | 84 | |
| 310 to 580 |
Thermal Properties
| Latent Heat of Fusion, J/g | 350 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 130 | |
| 910 |
| Melting Completion (Liquidus), °C | 600 | |
| 1400 |
| Melting Onset (Solidus), °C | 500 | |
| 1360 |
| Specific Heat Capacity, J/kg-K | 990 | |
| 480 |
| Thermal Conductivity, W/m-K | 84 | |
| 15 |
| Thermal Expansion, µm/m-K | 27 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 12 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 65 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 12 | |
| 13 |
| Density, g/cm3 | 1.7 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 23 | |
| 2.8 |
| Embodied Energy, MJ/kg | 160 | |
| 40 |
| Embodied Water, L/kg | 990 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 4.0 to 17 | |
| 120 to 260 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 77 to 78 | |
| 250 to 840 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 70 | |
| 25 |
| Strength to Weight: Axial, points | 26 to 39 | |
| 25 to 35 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 23 to 29 |
| Thermal Diffusivity, mm2/s | 50 | |
| 4.0 |
| Thermal Shock Resistance, points | 9.1 to 14 | |
| 15 to 21 |
Alloy Composition
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| Aluminum (Al), % | 7.0 to 8.1 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0 | |
| 17 to 19 |
| Copper (Cu), % | 0 to 0.1 | |
| 0 |
| Iron (Fe), % | 0 | |
| 63.5 to 71.5 |
| Magnesium (Mg), % | 89.8 to 92.5 | |
| 0 |
| Manganese (Mn), % | 0.13 to 0.35 | |
| 7.5 to 10 |
| Nickel (Ni), % | 0 to 0.010 | |
| 4.0 to 6.0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 | |
| 0 to 0.060 |
| Silicon (Si), % | 0 to 0.3 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Zinc (Zn), % | 0.4 to 1.0 | |
| 0 |
| Residuals, % | 0 to 0.3 | |
| 0 |