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AZ91B Magnesium vs. ACI-ASTM CN7M Steel

AZ91B magnesium belongs to the magnesium alloys classification, while ACI-ASTM CN7M 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 CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
140
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
44
Fatigue Strength, MPa 79
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
77
Tensile Strength: Ultimate (UTS), MPa 240
480
Tensile Strength: Yield (Proof), MPa 160
200

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
1450
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
21
Thermal Expansion, µm/m-K 26
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 58
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 12
32
Density, g/cm3 1.7
8.1
Embodied Carbon, kg CO2/kg material 22
5.6
Embodied Energy, MJ/kg 160
78
Embodied Water, L/kg 990
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
170
Resilience: Unit (Modulus of Resilience), kJ/m3 280
110
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
17
Strength to Weight: Bending, points 49
17
Thermal Diffusivity, mm2/s 42
5.6
Thermal Shock Resistance, points 14
12

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0
19 to 22
Copper (Cu), % 0 to 0.35
3.0 to 4.0
Iron (Fe), % 0
37.4 to 48.5
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 1.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0 to 0.030
27.5 to 30.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 0.35 to 1.0
0