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AISI 440B Stainless Steel vs. AZ63A Magnesium

AISI 440B stainless steel belongs to the iron alloys classification, while AZ63A magnesium belongs to the magnesium alloys. There are 29 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 AISI 440B stainless steel and the bottom bar is AZ63A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 3.0 to 18
2.2 to 8.0
Fatigue Strength, MPa 260 to 850
76 to 83
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Shear Strength, MPa 460 to 1110
110 to 160
Tensile Strength: Ultimate (UTS), MPa 740 to 1930
190 to 270
Tensile Strength: Yield (Proof), MPa 430 to 1860
81 to 120

Thermal Properties

Latent Heat of Fusion, J/g 280
350
Maximum Temperature: Mechanical, °C 870
120
Melting Completion (Liquidus), °C 1480
610
Melting Onset (Solidus), °C 1370
450
Specific Heat Capacity, J/kg-K 480
980
Thermal Conductivity, W/m-K 23
52 to 65
Thermal Expansion, µm/m-K 10
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
12 to 15
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
59 to 74

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
12
Density, g/cm3 7.7
1.8
Embodied Carbon, kg CO2/kg material 2.2
22
Embodied Energy, MJ/kg 31
150
Embodied Water, L/kg 120
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57 to 110
3.7 to 16
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
66
Strength to Weight: Axial, points 27 to 70
29 to 41
Strength to Weight: Bending, points 24 to 45
40 to 51
Thermal Diffusivity, mm2/s 6.1
29 to 37
Thermal Shock Resistance, points 27 to 70
11 to 16

Alloy Composition

Aluminum (Al), % 0
5.3 to 6.7
Carbon (C), % 0.75 to 1.0
0
Chromium (Cr), % 16 to 18
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 78.2 to 83.3
0
Magnesium (Mg), % 0
88.6 to 92.1
Manganese (Mn), % 0 to 1.0
0.15 to 0.35
Molybdenum (Mo), % 0 to 0.75
0
Nickel (Ni), % 0
0 to 0.010
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.3
Sulfur (S), % 0 to 0.015
0
Zinc (Zn), % 0
2.5 to 3.5
Residuals, % 0
0 to 0.3