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EN-MC21120 Magnesium vs. ASTM A225 Steel

EN-MC21120 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-MC21120 magnesium and the bottom bar is ASTM A225 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63 to 75
190 to 250
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 2.2 to 6.7
21 to 23
Fatigue Strength, MPa 84 to 96
330 to 390
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 110 to 160
390 to 520
Tensile Strength: Ultimate (UTS), MPa 200 to 270
620 to 830
Tensile Strength: Yield (Proof), MPa 130 to 170
460 to 550

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 130
400
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 490
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 76
52
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 59
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 22
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 5.0 to 15
120 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 320
580 to 820
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 31 to 43
22 to 29
Strength to Weight: Bending, points 43 to 53
21 to 25
Thermal Diffusivity, mm2/s 44
14
Thermal Shock Resistance, points 11 to 16
18 to 24

Comparable Variants