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AZ91B Magnesium vs. S64512 Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while S64512 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (6, 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 S64512 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
330
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
17
Fatigue Strength, MPa 79
540
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
76
Shear Strength, MPa 140
700
Tensile Strength: Ultimate (UTS), MPa 240
1140
Tensile Strength: Yield (Proof), MPa 160
890

Thermal Properties

Latent Heat of Fusion, J/g 360
270
Maximum Temperature: Mechanical, °C 130
750
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 470
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
28
Thermal Expansion, µm/m-K 26
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 58
4.1

Otherwise Unclassified Properties

Base Metal Price, % relative 12
10
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 22
3.3
Embodied Energy, MJ/kg 160
47
Embodied Water, L/kg 990
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
180
Resilience: Unit (Modulus of Resilience), kJ/m3 280
2020
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
40
Strength to Weight: Bending, points 49
31
Thermal Diffusivity, mm2/s 42
7.5
Thermal Shock Resistance, points 14
42

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.080 to 0.15
Chromium (Cr), % 0
11 to 12.5
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
80.6 to 84.7
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.5 to 0.9
Molybdenum (Mo), % 0
1.5 to 2.0
Nickel (Ni), % 0 to 0.030
2.0 to 3.0
Nitrogen (N), % 0
0.010 to 0.050
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.35
Sulfur (S), % 0
0 to 0.025
Vanadium (V), % 0
0.25 to 0.4
Zinc (Zn), % 0.35 to 1.0
0