ASTM A372 Grade J Steel vs. EN-MC21120 Magnesium
ASTM A372 grade J 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 A372 grade J steel and the bottom bar is EN-MC21120 magnesium.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 310 | |
| 63 to 75 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 46 |
| Elongation at Break, % | 17 to 22 | |
| 2.2 to 6.7 |
| Fatigue Strength, MPa | 310 to 570 | |
| 84 to 96 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 18 |
| Shear Strength, MPa | 410 to 630 | |
| 110 to 160 |
| Tensile Strength: Ultimate (UTS), MPa | 650 to 1020 | |
| 200 to 270 |
| Tensile Strength: Yield (Proof), MPa | 430 to 850 | |
| 130 to 170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 350 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 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 | 44 | |
| 76 |
| Thermal Expansion, µm/m-K | 13 | |
| 26 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 11 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 59 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 | |
| 12 |
| Density, g/cm3 | 7.8 | |
| 1.7 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 22 |
| Embodied Energy, MJ/kg | 20 | |
| 160 |
| Embodied Water, L/kg | 51 | |
| 990 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 130 to 170 | |
| 5.0 to 15 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 500 to 1930 | |
| 180 to 320 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 69 |
| Strength to Weight: Axial, points | 23 to 36 | |
| 31 to 43 |
| Strength to Weight: Bending, points | 21 to 29 | |
| 43 to 53 |
| Thermal Diffusivity, mm2/s | 12 | |
| 44 |
| Thermal Shock Resistance, points | 19 to 30 | |
| 11 to 16 |
Alloy Composition
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| Aluminum (Al), % | 0 | |
| 8.3 to 9.7 |
| Carbon (C), % | 0.35 to 0.5 | |
| 0 |
| Chromium (Cr), % | 0.8 to 1.2 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.030 |
| Iron (Fe), % | 96.7 to 97.8 | |
| 0 to 0.0050 |
| Magnesium (Mg), % | 0 | |
| 88.6 to 91.3 |
| Manganese (Mn), % | 0.75 to 1.1 | |
| 0.1 to 0.5 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 0 to 0.0020 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.2 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0.35 to 1.0 |
| Residuals, % | 0 | |
| 0 to 0.010 |