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K1A Magnesium vs. ACI-ASTM CB30 Steel

K1A magnesium belongs to the magnesium alloys classification, while ACI-ASTM CB30 steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (8, 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 CB30 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 43
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
77
Tensile Strength: Ultimate (UTS), MPa 180
500
Tensile Strength: Yield (Proof), MPa 51
230

Thermal Properties

Latent Heat of Fusion, J/g 350
290
Maximum Temperature: Mechanical, °C 120
940
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
21
Thermal Expansion, µm/m-K 27
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 30
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 170
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 13
10
Density, g/cm3 1.6
7.7
Embodied Carbon, kg CO2/kg material 24
2.3
Embodied Energy, MJ/kg 170
33
Embodied Water, L/kg 970
130

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 30
140
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 73
25
Strength to Weight: Axial, points 31
18
Strength to Weight: Bending, points 43
18
Thermal Diffusivity, mm2/s 75
5.6
Thermal Shock Resistance, points 11
17

Alloy Composition


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Carbon (C), % 0
0 to 0.3
Chromium (Cr), % 0
18 to 21
Copper (Cu), % 0
0 to 1.2
Iron (Fe), % 0
72.9 to 82
Magnesium (Mg), % 98.7 to 99.6
0
Manganese (Mn), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 2.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0