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AS41A Magnesium vs. S43940 Stainless Steel

AS41A magnesium belongs to the magnesium alloys classification, while S43940 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 S43940 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 11
21
Fatigue Strength, MPa 100
180
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
77
Shear Strength, MPa 130
310
Tensile Strength: Ultimate (UTS), MPa 230
490
Tensile Strength: Yield (Proof), MPa 140
280

Thermal Properties

Latent Heat of Fusion, J/g 370
280
Maximum Temperature: Mechanical, °C 110
890
Melting Completion (Liquidus), °C 620
1440
Melting Onset (Solidus), °C 570
1400
Specific Heat Capacity, J/kg-K 1000
480
Thermal Conductivity, W/m-K 68
25
Thermal Expansion, µm/m-K 26
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 92
3.4

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
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
86
Resilience: Unit (Modulus of Resilience), kJ/m3 220
200
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 72
25
Strength to Weight: Axial, points 38
18
Strength to Weight: Bending, points 50
18
Thermal Diffusivity, mm2/s 41
6.8
Thermal Shock Resistance, points 14
18

Alloy Composition

Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
17.5 to 18.5
Copper (Cu), % 0 to 0.060
0
Iron (Fe), % 0
78.2 to 82.1
Magnesium (Mg), % 92.8 to 95.8
0
Manganese (Mn), % 0.2 to 0.5
0 to 1.0
Nickel (Ni), % 0 to 0.030
0
Niobium (Nb), % 0
0.3 to 0.6
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.5 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0
0.1 to 0.6
Zinc (Zn), % 0 to 0.12
0