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ACI-ASTM CE30 Steel vs. AZ91A Magnesium

ACI-ASTM CE30 steel belongs to the iron alloys classification, while AZ91A 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 CE30 steel and the bottom bar is AZ91A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
63
Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 11
5.0
Fatigue Strength, MPa 170
99
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
18
Tensile Strength: Ultimate (UTS), MPa 630
240
Tensile Strength: Yield (Proof), MPa 310
160

Thermal Properties

Latent Heat of Fusion, J/g 310
360
Maximum Temperature: Mechanical, °C 1100
130
Melting Completion (Liquidus), °C 1410
600
Melting Onset (Solidus), °C 1360
470
Specific Heat Capacity, J/kg-K 490
990
Thermal Conductivity, W/m-K 14
73
Thermal Expansion, µm/m-K 17
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
10
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
52

Otherwise Unclassified Properties

Base Metal Price, % relative 19
12
Density, g/cm3 7.7
1.7
Embodied Carbon, kg CO2/kg material 3.4
22
Embodied Energy, MJ/kg 49
160
Embodied Water, L/kg 180
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 59
11
Resilience: Unit (Modulus of Resilience), kJ/m3 240
280
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 23
38
Strength to Weight: Bending, points 21
49
Thermal Diffusivity, mm2/s 3.6
42
Thermal Shock Resistance, points 13
14

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.3
0
Chromium (Cr), % 26 to 30
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 55.1 to 66
0
Magnesium (Mg), % 0
88.2 to 91.2
Manganese (Mn), % 0 to 1.5
0.13 to 0.5
Nickel (Ni), % 8.0 to 11
0 to 0.030
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0.35 to 1.0