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ASTM A299 Steel vs. EN-MC21320 Magnesium

ASTM A299 steel belongs to the iron alloys classification, while EN-MC21320 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 A299 steel and the bottom bar is EN-MC21320 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 190
68
Elastic (Young's, Tensile) Modulus, GPa 190
45
Elongation at Break, % 21 to 22
7.5
Fatigue Strength, MPa 230 to 250
95
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
18
Shear Strength, MPa 370 to 390
130
Tensile Strength: Ultimate (UTS), MPa 590 to 620
230
Tensile Strength: Yield (Proof), MPa 330 to 360
140

Thermal Properties

Latent Heat of Fusion, J/g 250
370
Maximum Temperature: Mechanical, °C 400
110
Melting Completion (Liquidus), °C 1460
600
Melting Onset (Solidus), °C 1420
530
Specific Heat Capacity, J/kg-K 470
1000
Thermal Conductivity, W/m-K 51
66
Thermal Expansion, µm/m-K 13
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
17
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
91

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
12
Density, g/cm3 7.8
1.6
Embodied Carbon, kg CO2/kg material 1.4
23
Embodied Energy, MJ/kg 19
160
Embodied Water, L/kg 47
980

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
15
Resilience: Unit (Modulus of Resilience), kJ/m3 290 to 350
200
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
72
Strength to Weight: Axial, points 21 to 22
38
Strength to Weight: Bending, points 20 to 21
50
Thermal Diffusivity, mm2/s 14
40
Thermal Shock Resistance, points 17 to 18
13