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AZ91B Magnesium vs. S35125 Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while S35125 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 S35125 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
39
Fatigue Strength, MPa 79
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
78
Shear Strength, MPa 140
370
Tensile Strength: Ultimate (UTS), MPa 240
540
Tensile Strength: Yield (Proof), MPa 160
230

Thermal Properties

Latent Heat of Fusion, J/g 360
300
Maximum Temperature: Mechanical, °C 130
1100
Melting Completion (Liquidus), °C 600
1430
Melting Onset (Solidus), °C 470
1380
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
12
Thermal Expansion, µm/m-K 26
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 58
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
36
Density, g/cm3 1.7
8.1
Embodied Carbon, kg CO2/kg material 22
6.4
Embodied Energy, MJ/kg 160
89
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
140
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
19
Strength to Weight: Bending, points 49
18
Thermal Diffusivity, mm2/s 42
3.1
Thermal Shock Resistance, points 14
12

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0
20 to 23
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
36.2 to 45.8
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
1.0 to 1.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0 to 0.030
31 to 35
Niobium (Nb), % 0
0.25 to 0.6
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0
0 to 0.015
Zinc (Zn), % 0.35 to 1.0
0