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EN-MC35110 Magnesium vs. SAE-AISI 81B45 Steel

EN-MC35110 magnesium belongs to the magnesium alloys classification, while SAE-AISI 81B45 steel belongs to the iron 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 EN-MC35110 magnesium and the bottom bar is SAE-AISI 81B45 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
160 to 200
Elastic (Young's, Tensile) Modulus, GPa 45
190
Elongation at Break, % 3.1
12 to 24
Fatigue Strength, MPa 110
250 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 130
340 to 400
Tensile Strength: Ultimate (UTS), MPa 230
540 to 670
Tensile Strength: Yield (Proof), MPa 150
350 to 560

Thermal Properties

Latent Heat of Fusion, J/g 330
250
Maximum Temperature: Mechanical, °C 140
410
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 520
1420
Specific Heat Capacity, J/kg-K 970
470
Thermal Conductivity, W/m-K 110
40
Thermal Expansion, µm/m-K 26
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 130
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 18
2.3
Density, g/cm3 1.9
7.8
Embodied Carbon, kg CO2/kg material 24
1.5
Embodied Energy, MJ/kg 170
20
Embodied Water, L/kg 940
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.3
77 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 260
320 to 840
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 63
24
Strength to Weight: Axial, points 34
19 to 24
Strength to Weight: Bending, points 44
19 to 22
Thermal Diffusivity, mm2/s 61
11
Thermal Shock Resistance, points 14
17 to 21

Alloy Composition


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Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0
0.43 to 0.48
Chromium (Cr), % 0
0.35 to 0.55
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.010
97 to 98
Magnesium (Mg), % 92 to 95.4
0
Manganese (Mn), % 0 to 0.15
0.75 to 1.0
Molybdenum (Mo), % 0
0.080 to 0.15
Nickel (Ni), % 0 to 0.0050
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.010
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Unspecified Rare Earths, % 0.75 to 1.8
0
Zinc (Zn), % 3.5 to 5.0
0
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.010
0