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ASTM A225 Steel vs. EN-MC21220 Magnesium

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

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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