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AISI 440A Stainless Steel vs. AZ91D Magnesium

AISI 440A stainless steel belongs to the iron alloys classification, while AZ91D magnesium belongs to the magnesium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (7, 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 440A stainless steel and the bottom bar is AZ91D magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 5.0 to 20
2.3 to 4.5
Fatigue Strength, MPa 270 to 790
74 to 85
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Shear Strength, MPa 450 to 1040
120 to 140
Tensile Strength: Ultimate (UTS), MPa 730 to 1790
160 to 220
Tensile Strength: Yield (Proof), MPa 420 to 1650
80 to 130

Thermal Properties

Latent Heat of Fusion, J/g 280
350
Maximum Temperature: Mechanical, °C 760
130
Melting Completion (Liquidus), °C 1480
600
Melting Onset (Solidus), °C 1370
490
Specific Heat Capacity, J/kg-K 480
990
Thermal Conductivity, W/m-K 23
78
Thermal Expansion, µm/m-K 10
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
11
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
58

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
22
Embodied Energy, MJ/kg 31
160
Embodied Water, L/kg 120
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 120
4.2 to 7.7
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 26 to 65
26 to 34
Strength to Weight: Bending, points 23 to 43
38 to 46
Thermal Diffusivity, mm2/s 6.2
45
Thermal Shock Resistance, points 26 to 65
9.5 to 13

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0.6 to 0.75
0
Chromium (Cr), % 16 to 18
0
Copper (Cu), % 0
0 to 0.030
Iron (Fe), % 78.4 to 83.4
0 to 0.0050
Magnesium (Mg), % 0
88.7 to 91.2
Manganese (Mn), % 0 to 1.0
0.15 to 0.5
Molybdenum (Mo), % 0 to 0.75
0
Nickel (Ni), % 0
0 to 0.0020
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
0.35 to 1.0