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AISI 440B Stainless Steel vs. AZ91A Magnesium

AISI 440B stainless steel belongs to the iron alloys classification, while AZ91A magnesium belongs to the magnesium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (6, 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 AZ91A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 3.0 to 18
5.0
Fatigue Strength, MPa 260 to 850
99
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Shear Strength, MPa 460 to 1110
140
Tensile Strength: Ultimate (UTS), MPa 740 to 1930
240
Tensile Strength: Yield (Proof), MPa 430 to 1860
160

Thermal Properties

Latent Heat of Fusion, J/g 280
360
Maximum Temperature: Mechanical, °C 870
130
Melting Completion (Liquidus), °C 1480
600
Melting Onset (Solidus), °C 1370
470
Specific Heat Capacity, J/kg-K 480
990
Thermal Conductivity, W/m-K 23
73
Thermal Expansion, µm/m-K 10
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
10
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
52

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 57 to 110
11
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 27 to 70
38
Strength to Weight: Bending, points 24 to 45
49
Thermal Diffusivity, mm2/s 6.1
42
Thermal Shock Resistance, points 27 to 70
14

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
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
88.2 to 91.2
Manganese (Mn), % 0 to 1.0
0.13 to 0.5
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 0.5
Sulfur (S), % 0 to 0.015
0
Zinc (Zn), % 0
0.35 to 1.0