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K1A Magnesium vs. SAE-AISI 4012 Steel

K1A magnesium belongs to the magnesium alloys classification, while SAE-AISI 4012 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 SAE-AISI 4012 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 43
190
Elongation at Break, % 13
23
Fatigue Strength, MPa 39
160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
73
Shear Strength, MPa 55
270
Tensile Strength: Ultimate (UTS), MPa 180
420
Tensile Strength: Yield (Proof), MPa 51
220

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 120
400
Melting Completion (Liquidus), °C 650
1460
Melting Onset (Solidus), °C 650
1420
Specific Heat Capacity, J/kg-K 1000
470
Thermal Conductivity, W/m-K 120
51
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 30
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 170
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 13
2.1
Density, g/cm3 1.6
7.8
Embodied Carbon, kg CO2/kg material 24
1.5
Embodied Energy, MJ/kg 170
19
Embodied Water, L/kg 970
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17
82
Resilience: Unit (Modulus of Resilience), kJ/m3 30
130
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 73
24
Strength to Weight: Axial, points 31
15
Strength to Weight: Bending, points 43
16
Thermal Diffusivity, mm2/s 75
14
Thermal Shock Resistance, points 11
12

Alloy Composition


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Carbon (C), % 0
0.090 to 0.14
Iron (Fe), % 0
98.2 to 98.9
Magnesium (Mg), % 98.7 to 99.6
0
Manganese (Mn), % 0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0