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AS41A Magnesium vs. S32101 Stainless Steel

AS41A magnesium belongs to the magnesium alloys classification, while S32101 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 AS41A magnesium and the bottom bar is S32101 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 11
34
Fatigue Strength, MPa 100
400
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
78
Shear Strength, MPa 130
490
Tensile Strength: Ultimate (UTS), MPa 230
740
Tensile Strength: Yield (Proof), MPa 140
500

Thermal Properties

Latent Heat of Fusion, J/g 370
290
Maximum Temperature: Mechanical, °C 110
1000
Melting Completion (Liquidus), °C 620
1420
Melting Onset (Solidus), °C 570
1370
Specific Heat Capacity, J/kg-K 1000
480
Thermal Conductivity, W/m-K 68
15
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 92
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
12
Density, g/cm3 1.6
7.7
Embodied Carbon, kg CO2/kg material 23
2.6
Embodied Energy, MJ/kg 160
38
Embodied Water, L/kg 980
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
230
Resilience: Unit (Modulus of Resilience), kJ/m3 220
640
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 72
25
Strength to Weight: Axial, points 38
27
Strength to Weight: Bending, points 50
24
Thermal Diffusivity, mm2/s 41
4.0
Thermal Shock Resistance, points 14
20

Alloy Composition

Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
0 to 0.040
Chromium (Cr), % 0
21 to 22
Copper (Cu), % 0 to 0.060
0.1 to 0.8
Iron (Fe), % 0
67.3 to 73.3
Magnesium (Mg), % 92.8 to 95.8
0
Manganese (Mn), % 0.2 to 0.5
4.0 to 6.0
Molybdenum (Mo), % 0
0.1 to 0.8
Nickel (Ni), % 0 to 0.030
1.4 to 1.7
Nitrogen (N), % 0
0.2 to 0.25
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.5 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.12
0