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AISI 440B Stainless Steel vs. AZ31C Magnesium

AISI 440B 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 440B 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, % 3.0 to 18
12
Fatigue Strength, MPa 260 to 850
150
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
17
Shear Strength, MPa 460 to 1110
130
Tensile Strength: Ultimate (UTS), MPa 740 to 1930
260
Tensile Strength: Yield (Proof), MPa 430 to 1860
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 23
130
Thermal Expansion, µm/m-K 10
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
19
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
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 57 to 110
28
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
70
Strength to Weight: Axial, points 27 to 70
42
Strength to Weight: Bending, points 24 to 45
53
Thermal Diffusivity, mm2/s 6.1
74
Thermal Shock Resistance, points 27 to 70
16

Alloy Composition

Aluminum (Al), % 0
2.4 to 3.6
Carbon (C), % 0.75 to 1.0
0
Chromium (Cr), % 16 to 18
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 78.2 to 83.3
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