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ACI-ASTM CA40 Steel vs. AZ91B Magnesium

ACI-ASTM CA40 steel belongs to the iron alloys classification, while AZ91B magnesium belongs to the magnesium alloys. There are 30 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 ACI-ASTM CA40 steel and the bottom bar is AZ91B magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
63
Elastic (Young's, Tensile) Modulus, GPa 190
46
Elongation at Break, % 10
5.0
Fatigue Strength, MPa 460
79
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
18
Tensile Strength: Ultimate (UTS), MPa 910
240
Tensile Strength: Yield (Proof), MPa 860
160

Thermal Properties

Latent Heat of Fusion, J/g 280
360
Maximum Temperature: Mechanical, °C 750
130
Melting Completion (Liquidus), °C 1440
600
Melting Onset (Solidus), °C 1500
470
Specific Heat Capacity, J/kg-K 480
990
Thermal Conductivity, W/m-K 25
73
Thermal Expansion, µm/m-K 10
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
11
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
58

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
12
Density, g/cm3 7.7
1.7
Embodied Carbon, kg CO2/kg material 2.0
22
Embodied Energy, MJ/kg 28
160
Embodied Water, L/kg 100
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
11
Resilience: Unit (Modulus of Resilience), kJ/m3 1910
280
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 33
38
Strength to Weight: Bending, points 27
49
Thermal Diffusivity, mm2/s 6.7
42
Thermal Shock Resistance, points 33
14

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0.2 to 0.4
0
Chromium (Cr), % 11.5 to 14
0
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 81.5 to 88.3
0
Magnesium (Mg), % 0
87.9 to 91.2
Manganese (Mn), % 0 to 1.0
0.13 to 0.5
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 1.0
0 to 0.030
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.5
0 to 0.5
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0.35 to 1.0