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AM50A Magnesium vs. S82122 Stainless Steel

AM50A magnesium belongs to the magnesium alloys classification, while S82122 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, 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 AM50A magnesium and the bottom bar is S82122 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 58
260
Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 11
34
Fatigue Strength, MPa 70
360
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
78
Shear Strength, MPa 120
460
Tensile Strength: Ultimate (UTS), MPa 210
680
Tensile Strength: Yield (Proof), MPa 120
450

Thermal Properties

Latent Heat of Fusion, J/g 350
290
Maximum Temperature: Mechanical, °C 120
990
Melting Completion (Liquidus), °C 620
1420
Melting Onset (Solidus), °C 570
1380
Specific Heat Capacity, J/kg-K 1000
480
Thermal Conductivity, W/m-K 65
15
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 16
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 88
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
12
Density, g/cm3 1.7
7.7
Embodied Carbon, kg CO2/kg material 23
2.6
Embodied Energy, MJ/kg 160
37
Embodied Water, L/kg 990
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19
210
Resilience: Unit (Modulus of Resilience), kJ/m3 150
510
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 71
25
Strength to Weight: Axial, points 35
25
Strength to Weight: Bending, points 47
22
Thermal Diffusivity, mm2/s 39
4.0
Thermal Shock Resistance, points 13
19

Alloy Composition

Aluminum (Al), % 4.4 to 5.4
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
20.5 to 21.5
Copper (Cu), % 0 to 0.010
0.5 to 1.5
Iron (Fe), % 0 to 0.0040
68.9 to 75.4
Magnesium (Mg), % 93.7 to 95.3
0
Manganese (Mn), % 0.26 to 0.6
2.0 to 4.0
Molybdenum (Mo), % 0
0 to 0.6
Nickel (Ni), % 0 to 0.0020
1.5 to 2.5
Nitrogen (N), % 0
0.15 to 0.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.1
0 to 0.75
Sulfur (S), % 0
0 to 0.020
Zinc (Zn), % 0 to 0.22
0