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AZ81A Magnesium vs. N08332 Stainless Steel

AZ81A magnesium belongs to the magnesium alloys classification, while N08332 stainless steel belongs to the iron alloys. There are 31 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 AZ81A magnesium and the bottom bar is N08332 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 55
170
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 3.0 to 8.8
34
Fatigue Strength, MPa 78 to 80
170
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
76
Shear Strength, MPa 91 to 130
350
Tensile Strength: Ultimate (UTS), MPa 160 to 240
520
Tensile Strength: Yield (Proof), MPa 84
210

Thermal Properties

Latent Heat of Fusion, J/g 350
310
Maximum Temperature: Mechanical, °C 130
1050
Melting Completion (Liquidus), °C 600
1390
Melting Onset (Solidus), °C 500
1340
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 84
12
Thermal Expansion, µm/m-K 27
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 65
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
32
Density, g/cm3 1.7
8.0
Embodied Carbon, kg CO2/kg material 23
5.4
Embodied Energy, MJ/kg 160
77
Embodied Water, L/kg 990
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
140
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
110
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 70
24
Strength to Weight: Axial, points 26 to 39
18
Strength to Weight: Bending, points 38 to 50
18
Thermal Diffusivity, mm2/s 50
3.1
Thermal Shock Resistance, points 9.1 to 14
12

Alloy Composition

Aluminum (Al), % 7.0 to 8.1
0
Carbon (C), % 0
0.050 to 0.1
Chromium (Cr), % 0
17 to 20
Copper (Cu), % 0 to 0.1
0 to 1.0
Iron (Fe), % 0
38.3 to 48.2
Lead (Pb), % 0
0 to 0.0050
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0 to 2.0
Nickel (Ni), % 0 to 0.010
34 to 37
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.3
0.75 to 1.5
Sulfur (S), % 0
0 to 0.030
Tin (Sn), % 0
0 to 0.025
Zinc (Zn), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0