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AZ91B Magnesium vs. S31277 Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while S31277 stainless steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (9, 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 S31277 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
210
Elongation at Break, % 5.0
45
Fatigue Strength, MPa 79
380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
80
Shear Strength, MPa 140
600
Tensile Strength: Ultimate (UTS), MPa 240
860
Tensile Strength: Yield (Proof), MPa 160
410

Thermal Properties

Latent Heat of Fusion, J/g 360
310
Maximum Temperature: Mechanical, °C 130
1100
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 470
1410
Specific Heat Capacity, J/kg-K 990
460
Thermal Expansion, µm/m-K 26
16

Otherwise Unclassified Properties

Base Metal Price, % relative 12
36
Density, g/cm3 1.7
8.1
Embodied Carbon, kg CO2/kg material 22
6.7
Embodied Energy, MJ/kg 160
90
Embodied Water, L/kg 990
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
320
Resilience: Unit (Modulus of Resilience), kJ/m3 280
410
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
29
Strength to Weight: Bending, points 49
25
Thermal Shock Resistance, points 14
19

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.020
Chromium (Cr), % 0
20.5 to 23
Copper (Cu), % 0 to 0.35
0.5 to 1.5
Iron (Fe), % 0
35.5 to 46.2
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 3.0
Molybdenum (Mo), % 0
6.5 to 8.0
Nickel (Ni), % 0 to 0.030
26 to 28
Nitrogen (N), % 0
0.3 to 0.4
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0
0 to 0.010
Zinc (Zn), % 0.35 to 1.0
0