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ASTM A204 Steel vs. EN-MC21220 Magnesium

ASTM A204 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 A204 steel and the bottom bar is EN-MC21220 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 180
58
Elastic (Young's, Tensile) Modulus, GPa 190
45
Elongation at Break, % 18 to 22
11
Fatigue Strength, MPa 200 to 220
89
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
17
Shear Strength, MPa 330 to 360
120
Tensile Strength: Ultimate (UTS), MPa 520 to 590
210
Tensile Strength: Yield (Proof), MPa 290 to 330
120

Thermal Properties

Latent Heat of Fusion, J/g 250
350
Maximum Temperature: Mechanical, °C 410
120
Melting Completion (Liquidus), °C 1470
600
Melting Onset (Solidus), °C 1420 to 1430
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 7.2
16
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
87

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
12
Density, g/cm3 7.9
1.7
Embodied Carbon, kg CO2/kg material 1.5
23
Embodied Energy, MJ/kg 20
160
Embodied Water, L/kg 47
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 90 to 95
20
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 290
160
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
71
Strength to Weight: Axial, points 18 to 21
34
Strength to Weight: Bending, points 18 to 20
46
Thermal Diffusivity, mm2/s 14
39
Thermal Shock Resistance, points 15 to 17
12