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AZ91B Magnesium vs. S66286 Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while S66286 stainless 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 S66286 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
17 to 40
Fatigue Strength, MPa 79
240 to 410
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
75
Shear Strength, MPa 140
420 to 630
Tensile Strength: Ultimate (UTS), MPa 240
620 to 1020
Tensile Strength: Yield (Proof), MPa 160
280 to 670

Thermal Properties

Latent Heat of Fusion, J/g 360
300
Maximum Temperature: Mechanical, °C 130
920
Melting Completion (Liquidus), °C 600
1430
Melting Onset (Solidus), °C 470
1370
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
15
Thermal Expansion, µm/m-K 26
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 58
2.2

Otherwise Unclassified Properties

Base Metal Price, % relative 12
26
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
6.0
Embodied Energy, MJ/kg 160
87
Embodied Water, L/kg 990
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
150 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 280
190 to 1150
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
22 to 36
Strength to Weight: Bending, points 49
20 to 28
Thermal Diffusivity, mm2/s 42
4.0
Thermal Shock Resistance, points 14
13 to 22

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0 to 0.35
Boron (B), % 0
0.0010 to 0.010
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0
13.5 to 16
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
49.1 to 59.5
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 2.0
Molybdenum (Mo), % 0
1.0 to 1.5
Nickel (Ni), % 0 to 0.030
24 to 27
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0
1.9 to 2.4
Vanadium (V), % 0
0.1 to 0.5
Zinc (Zn), % 0.35 to 1.0
0