AZ91B Magnesium vs. N08800 Stainless Steel
AZ91B magnesium belongs to the magnesium alloys classification, while N08800 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (6, 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 AZ91B magnesium and the bottom bar is N08800 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 46 | |
| 200 |
| Elongation at Break, % | 5.0 | |
| 4.5 to 34 |
| Fatigue Strength, MPa | 79 | |
| 150 to 390 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 18 | |
| 77 |
| Shear Strength, MPa | 140 | |
| 340 to 580 |
| Tensile Strength: Ultimate (UTS), MPa | 240 | |
| 500 to 1000 |
| Tensile Strength: Yield (Proof), MPa | 160 | |
| 190 to 830 |
Thermal Properties
| Latent Heat of Fusion, J/g | 360 | |
| 300 |
| Maximum Temperature: Mechanical, °C | 130 | |
| 1100 |
| Melting Completion (Liquidus), °C | 600 | |
| 1390 |
| Melting Onset (Solidus), °C | 470 | |
| 1360 |
| Specific Heat Capacity, J/kg-K | 990 | |
| 480 |
| Thermal Conductivity, W/m-K | 73 | |
| 12 |
| Thermal Expansion, µm/m-K | 26 | |
| 14 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 11 | |
| 1.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 58 | |
| 1.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 12 | |
| 30 |
| Density, g/cm3 | 1.7 | |
| 8.0 |
| Embodied Carbon, kg CO2/kg material | 22 | |
| 5.3 |
| Embodied Energy, MJ/kg | 160 | |
| 76 |
| Embodied Water, L/kg | 990 | |
| 200 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 11 | |
| 42 to 160 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 280 | |
| 96 to 1740 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 69 | |
| 24 |
| Strength to Weight: Axial, points | 38 | |
| 18 to 35 |
| Strength to Weight: Bending, points | 49 | |
| 18 to 28 |
| Thermal Diffusivity, mm2/s | 42 | |
| 3.0 |
| Thermal Shock Resistance, points | 14 | |
| 13 to 25 |
Alloy Composition
| Aluminum (Al), % | 8.3 to 9.7 | |
| 0.15 to 0.6 |
| Carbon (C), % | 0 | |
| 0 to 0.1 |
| Chromium (Cr), % | 0 | |
| 19 to 23 |
| Copper (Cu), % | 0 to 0.35 | |
| 0 to 0.75 |
| Iron (Fe), % | 0 | |
| 39.5 to 50.7 |
| Magnesium (Mg), % | 87.9 to 91.2 | |
| 0 |
| Manganese (Mn), % | 0.13 to 0.5 | |
| 0 to 1.5 |
| Nickel (Ni), % | 0 to 0.030 | |
| 30 to 35 |
| Phosphorus (P), % | 0 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |
| Titanium (Ti), % | 0 | |
| 0.15 to 0.6 |
| Zinc (Zn), % | 0.35 to 1.0 | |
| 0 |