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AZ91A Magnesium vs. S81921 Stainless Steel

AZ91A magnesium belongs to the magnesium alloys classification, while S81921 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 AZ91A magnesium and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
260
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
29
Fatigue Strength, MPa 99
370
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
79
Shear Strength, MPa 140
460
Tensile Strength: Ultimate (UTS), MPa 240
710
Tensile Strength: Yield (Proof), MPa 160
500

Thermal Properties

Latent Heat of Fusion, J/g 360
290
Maximum Temperature: Mechanical, °C 130
990
Melting Completion (Liquidus), °C 600
1430
Melting Onset (Solidus), °C 470
1390
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
15
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 52
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
14
Density, g/cm3 1.7
7.7
Embodied Carbon, kg CO2/kg material 22
2.9
Embodied Energy, MJ/kg 160
41
Embodied Water, L/kg 990
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
180
Resilience: Unit (Modulus of Resilience), kJ/m3 280
630
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
25
Strength to Weight: Bending, points 49
23
Thermal Diffusivity, mm2/s 42
4.0
Thermal Shock Resistance, points 14
20

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
19 to 22
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
66.7 to 75.9
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
2.0 to 4.0
Molybdenum (Mo), % 0
1.0 to 2.0
Nickel (Ni), % 0 to 0.030
2.0 to 4.0
Nitrogen (N), % 0
0.14 to 0.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0.35 to 1.0
0