AZ91D Magnesium vs. EN 1.7767 Steel
AZ91D magnesium belongs to the magnesium alloys classification, while EN 1.7767 steel belongs to the iron alloys. There are 32 material properties with values for both materials. Properties with values for just one material (3, 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 AZ91D magnesium and the bottom bar is EN 1.7767 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 60 to 80 | |
| 200 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 46 | |
| 190 |
| Elongation at Break, % | 2.3 to 4.5 | |
| 20 |
| Fatigue Strength, MPa | 74 to 85 | |
| 320 to 340 |
| Impact Strength: V-Notched Charpy, J | 2.7 | |
| 46 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 18 | |
| 74 |
| Shear Strength, MPa | 120 to 140 | |
| 420 to 430 |
| Tensile Strength: Ultimate (UTS), MPa | 160 to 220 | |
| 670 to 690 |
| Tensile Strength: Yield (Proof), MPa | 80 to 130 | |
| 460 to 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 350 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 130 | |
| 480 |
| Melting Completion (Liquidus), °C | 600 | |
| 1470 |
| Melting Onset (Solidus), °C | 490 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 990 | |
| 470 |
| Thermal Conductivity, W/m-K | 78 | |
| 40 |
| Thermal Expansion, µm/m-K | 27 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 11 | |
| 7.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 58 | |
| 8.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 12 | |
| 4.5 |
| Density, g/cm3 | 1.7 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 22 | |
| 2.4 |
| Embodied Energy, MJ/kg | 160 | |
| 33 |
| Embodied Water, L/kg | 990 | |
| 64 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 4.2 to 7.7 | |
| 120 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 69 to 170 | |
| 570 to 650 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 69 | |
| 24 |
| Strength to Weight: Axial, points | 26 to 34 | |
| 24 |
| Strength to Weight: Bending, points | 38 to 46 | |
| 22 |
| Thermal Diffusivity, mm2/s | 45 | |
| 11 |
| Thermal Shock Resistance, points | 9.5 to 13 | |
| 19 to 20 |
Alloy Composition
| Aluminum (Al), % | 8.3 to 9.7 | |
| 0 |
| Carbon (C), % | 0 | |
| 0.1 to 0.15 |
| Chromium (Cr), % | 0 | |
| 2.8 to 3.3 |
| Copper (Cu), % | 0 to 0.030 | |
| 0 to 0.25 |
| Iron (Fe), % | 0 to 0.0050 | |
| 93.8 to 95.8 |
| Magnesium (Mg), % | 88.7 to 91.2 | |
| 0 |
| Manganese (Mn), % | 0.15 to 0.5 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0 | |
| 0.9 to 1.1 |
| Nickel (Ni), % | 0 to 0.0020 | |
| 0 to 0.25 |
| Niobium (Nb), % | 0 | |
| 0 to 0.070 |
| Nitrogen (N), % | 0 | |
| 0 to 0.012 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 0.1 | |
| 0 to 0.15 |
| Sulfur (S), % | 0 | |
| 0 to 0.0050 |
| Titanium (Ti), % | 0 | |
| 0 to 0.030 |
| Vanadium (V), % | 0 | |
| 0.2 to 0.3 |
| Zinc (Zn), % | 0.35 to 1.0 | |
| 0 |