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K1A Magnesium vs. ACI-ASTM CB7Cu-2 Steel

K1A magnesium belongs to the magnesium alloys classification, while ACI-ASTM CB7Cu-2 steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown. 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 K1A magnesium and the bottom bar is ACI-ASTM CB7Cu-2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 43
190
Elongation at Break, % 13
5.7 to 11
Fatigue Strength, MPa 39
420 to 590
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
75
Tensile Strength: Ultimate (UTS), MPa 180
960 to 1350
Tensile Strength: Yield (Proof), MPa 51
760 to 1180

Thermal Properties

Latent Heat of Fusion, J/g 350
280
Melting Completion (Liquidus), °C 650
1430
Melting Onset (Solidus), °C 650
1380
Specific Heat Capacity, J/kg-K 1000
480
Thermal Conductivity, W/m-K 120
17
Thermal Expansion, µm/m-K 27
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 30
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 170
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 13
13
Density, g/cm3 1.6
7.8
Embodied Carbon, kg CO2/kg material 24
2.6
Embodied Energy, MJ/kg 170
38
Embodied Water, L/kg 970
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 30
1510 to 3600
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 73
25
Strength to Weight: Axial, points 31
34 to 48
Strength to Weight: Bending, points 43
28 to 35
Thermal Diffusivity, mm2/s 75
4.6
Thermal Shock Resistance, points 11
32 to 45

Alloy Composition


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Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0
14 to 15.5
Copper (Cu), % 0
2.5 to 3.2
Iron (Fe), % 0
73.6 to 79
Magnesium (Mg), % 98.7 to 99.6
0
Manganese (Mn), % 0
0 to 0.7
Nickel (Ni), % 0
4.5 to 5.5
Niobium (Nb), % 0
0 to 0.35
Nitrogen (N), % 0
0 to 0.050
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0