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EN-MC21220 Magnesium vs. ASTM A225 Steel

EN-MC21220 magnesium belongs to the magnesium alloys classification, while ASTM A225 steel belongs to the iron 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 EN-MC21220 magnesium and the bottom bar is ASTM A225 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 58
190 to 250
Elastic (Young's, Tensile) Modulus, GPa 45
190
Elongation at Break, % 11
21 to 23
Fatigue Strength, MPa 89
330 to 390
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
73
Shear Strength, MPa 120
390 to 520
Tensile Strength: Ultimate (UTS), MPa 210
620 to 830
Tensile Strength: Yield (Proof), MPa 120
460 to 550

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 120
400
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 540
1420
Specific Heat Capacity, J/kg-K 1000
470
Thermal Conductivity, W/m-K 65
52
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 16
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 87
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.3
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 23
1.8
Embodied Energy, MJ/kg 160
24 to 25
Embodied Water, L/kg 990
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 20
120 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 160
580 to 820
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 71
24
Strength to Weight: Axial, points 34
22 to 29
Strength to Weight: Bending, points 46
21 to 25
Thermal Diffusivity, mm2/s 39
14
Thermal Shock Resistance, points 12
18 to 24