ASTM A203 Steel vs. EN-MC21120 Magnesium
ASTM A203 steel belongs to the iron alloys classification, while EN-MC21120 magnesium belongs to the magnesium alloys. 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 ASTM A203 steel and the bottom bar is EN-MC21120 magnesium.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 to 180 | |
| 63 to 75 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 46 |
| Elongation at Break, % | 22 to 26 | |
| 2.2 to 6.7 |
| Fatigue Strength, MPa | 210 to 280 | |
| 84 to 96 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 18 |
| Shear Strength, MPa | 330 to 370 | |
| 110 to 160 |
| Tensile Strength: Ultimate (UTS), MPa | 520 to 590 | |
| 200 to 270 |
| Tensile Strength: Yield (Proof), MPa | 290 to 390 | |
| 130 to 170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 350 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 130 |
| Melting Completion (Liquidus), °C | 1460 | |
| 600 |
| Melting Onset (Solidus), °C | 1420 | |
| 490 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 990 |
| Thermal Conductivity, W/m-K | 52 | |
| 76 |
| Thermal Expansion, µm/m-K | 13 | |
| 26 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 to 7.6 | |
| 11 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.5 to 8.7 | |
| 59 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.2 to 4.0 | |
| 12 |
| Density, g/cm3 | 7.9 | |
| 1.7 |
| Embodied Carbon, kg CO2/kg material | 1.6 to 1.7 | |
| 22 |
| Embodied Energy, MJ/kg | 21 to 23 | |
| 160 |
| Embodied Water, L/kg | 50 to 52 | |
| 990 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 120 | |
| 5.0 to 15 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 230 to 410 | |
| 180 to 320 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 69 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 31 to 43 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 43 to 53 |
| Thermal Diffusivity, mm2/s | 14 | |
| 44 |
| Thermal Shock Resistance, points | 15 to 17 | |
| 11 to 16 |