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AZ91B Magnesium vs. ACI-ASTM CE30 Steel

AZ91B magnesium belongs to the magnesium alloys classification, while ACI-ASTM CE30 steel belongs to the iron 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 AZ91B magnesium and the bottom bar is ACI-ASTM CE30 steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 58
2.4

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.3
Chromium (Cr), % 0
26 to 30
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
55.1 to 66
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 1.5
Nickel (Ni), % 0 to 0.030
8.0 to 11
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 0.35 to 1.0
0