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AS41A Magnesium vs. AISI 440B Stainless Steel

AS41A magnesium belongs to the magnesium alloys classification, while AISI 440B stainless steel belongs to the iron alloys. There are 29 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 AS41A magnesium and the bottom bar is AISI 440B stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 11
3.0 to 18
Fatigue Strength, MPa 100
260 to 850
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
77
Shear Strength, MPa 130
460 to 1110
Tensile Strength: Ultimate (UTS), MPa 230
740 to 1930
Tensile Strength: Yield (Proof), MPa 140
430 to 1860

Thermal Properties

Latent Heat of Fusion, J/g 370
280
Maximum Temperature: Mechanical, °C 110
870
Melting Completion (Liquidus), °C 620
1480
Melting Onset (Solidus), °C 570
1370
Specific Heat Capacity, J/kg-K 1000
480
Thermal Conductivity, W/m-K 68
23
Thermal Expansion, µm/m-K 26
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 92
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.0
Density, g/cm3 1.6
7.7
Embodied Carbon, kg CO2/kg material 23
2.2
Embodied Energy, MJ/kg 160
31
Embodied Water, L/kg 980
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
57 to 110
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 72
25
Strength to Weight: Axial, points 38
27 to 70
Strength to Weight: Bending, points 50
24 to 45
Thermal Diffusivity, mm2/s 41
6.1
Thermal Shock Resistance, points 14
27 to 70

Alloy Composition

Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
0.75 to 1.0
Chromium (Cr), % 0
16 to 18
Copper (Cu), % 0 to 0.060
0
Iron (Fe), % 0
78.2 to 83.3
Magnesium (Mg), % 92.8 to 95.8
0
Manganese (Mn), % 0.2 to 0.5
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.75
Nickel (Ni), % 0 to 0.030
0
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
Zinc (Zn), % 0 to 0.12
0