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AISI 440C Stainless Steel vs. AZ31C Magnesium

AISI 440C stainless steel belongs to the iron alloys classification, while AZ31C magnesium belongs to the magnesium 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 AISI 440C stainless steel and the bottom bar is AZ31C magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 2.0 to 14
12
Fatigue Strength, MPa 260 to 840
150
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
17
Shear Strength, MPa 430 to 1120
130
Tensile Strength: Ultimate (UTS), MPa 710 to 1970
260
Tensile Strength: Yield (Proof), MPa 450 to 1900
200

Thermal Properties

Latent Heat of Fusion, J/g 280
350
Maximum Temperature: Mechanical, °C 870
110
Melting Completion (Liquidus), °C 1480
600
Melting Onset (Solidus), °C 1370
550
Specific Heat Capacity, J/kg-K 480
990
Thermal Conductivity, W/m-K 22
130
Thermal Expansion, µm/m-K 10
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
19
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
98

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
12
Density, g/cm3 7.7
1.7
Embodied Carbon, kg CO2/kg material 2.2
23
Embodied Energy, MJ/kg 31
160
Embodied Water, L/kg 120
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 39 to 88
28
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
70
Strength to Weight: Axial, points 26 to 71
42
Strength to Weight: Bending, points 23 to 46
53
Thermal Diffusivity, mm2/s 6.0
74
Thermal Shock Resistance, points 26 to 71
16

Alloy Composition

Aluminum (Al), % 0
2.4 to 3.6
Carbon (C), % 1.0 to 1.2
0
Chromium (Cr), % 16 to 18
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 78 to 83.1
0
Magnesium (Mg), % 0
93.4 to 97
Manganese (Mn), % 0 to 1.0
0.15 to 1.0
Molybdenum (Mo), % 0 to 0.75
0
Nickel (Ni), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.1
Sulfur (S), % 0 to 0.015
0
Zinc (Zn), % 0
0.5 to 1.5
Residuals, % 0
0 to 0.3