AISI 431 Stainless Steel vs. AZ91C Magnesium
AISI 431 stainless steel belongs to the iron alloys classification, while AZ91C magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 AISI 431 stainless steel and the bottom bar is AZ91C magnesium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 46 |
| Elongation at Break, % | 15 to 17 | |
| 2.3 to 7.9 |
| Fatigue Strength, MPa | 430 to 610 | |
| 56 to 85 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 18 |
| Shear Strength, MPa | 550 to 840 | |
| 96 to 160 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1380 | |
| 170 to 270 |
| Tensile Strength: Yield (Proof), MPa | 710 to 1040 | |
| 83 to 130 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 350 |
| Maximum Temperature: Mechanical, °C | 850 | |
| 130 |
| Melting Completion (Liquidus), °C | 1510 | |
| 600 |
| Melting Onset (Solidus), °C | 1450 | |
| 470 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 990 |
| Thermal Conductivity, W/m-K | 26 | |
| 73 |
| Thermal Expansion, µm/m-K | 12 | |
| 26 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.6 | |
| 9.9 to 12 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 3.0 | |
| 52 to 60 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.0 | |
| 12 |
| Density, g/cm3 | 7.7 | |
| 1.7 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 22 |
| Embodied Energy, MJ/kg | 31 | |
| 160 |
| Embodied Water, L/kg | 120 | |
| 990 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 180 | |
| 3.2 to 16 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1270 to 2770 | |
| 75 to 180 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 25 | |
| 69 |
| Strength to Weight: Axial, points | 32 to 50 | |
| 27 to 43 |
| Strength to Weight: Bending, points | 27 to 36 | |
| 39 to 53 |
| Thermal Diffusivity, mm2/s | 7.0 | |
| 43 |
| Thermal Shock Resistance, points | 28 to 43 | |
| 9.9 to 16 |
Alloy Composition
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| Aluminum (Al), % | 0 | |
| 8.1 to 9.3 |
| Carbon (C), % | 0 to 0.2 | |
| 0 |
| Chromium (Cr), % | 15 to 17 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.1 |
| Iron (Fe), % | 78.2 to 83.8 | |
| 0 |
| Magnesium (Mg), % | 0 | |
| 88.6 to 91.4 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.13 to 0.35 |
| Nickel (Ni), % | 1.3 to 2.5 | |
| 0 to 0.010 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.3 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0.4 to 1.0 |
| Residuals, % | 0 | |
| 0 to 0.3 |