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AISI 418 Stainless Steel vs. AZ91A Magnesium

AISI 418 stainless steel belongs to the iron alloys classification, while AZ91A magnesium belongs to the magnesium alloys. There are 31 material properties with values for both materials. Properties with values for just one material (5, 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 418 stainless steel and the bottom bar is AZ91A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
63
Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 17
5.0
Fatigue Strength, MPa 520
99
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Shear Strength, MPa 680
140
Tensile Strength: Ultimate (UTS), MPa 1100
240
Tensile Strength: Yield (Proof), MPa 850
160

Thermal Properties

Latent Heat of Fusion, J/g 270
360
Maximum Temperature: Mechanical, °C 770
130
Melting Completion (Liquidus), °C 1500
600
Melting Onset (Solidus), °C 1460
470
Specific Heat Capacity, J/kg-K 470
990
Thermal Conductivity, W/m-K 25
73
Thermal Expansion, µm/m-K 10
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
10
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
52

Otherwise Unclassified Properties

Base Metal Price, % relative 15
12
Density, g/cm3 8.0
1.7
Embodied Carbon, kg CO2/kg material 2.9
22
Embodied Energy, MJ/kg 41
160
Embodied Water, L/kg 110
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
11
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
280
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
69
Strength to Weight: Axial, points 38
38
Strength to Weight: Bending, points 29
49
Thermal Diffusivity, mm2/s 6.7
42
Thermal Shock Resistance, points 40
14

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0.15 to 0.2
0
Chromium (Cr), % 12 to 14
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 78.5 to 83.6
0
Magnesium (Mg), % 0
88.2 to 91.2
Manganese (Mn), % 0 to 0.5
0.13 to 0.5
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 1.8 to 2.2
0 to 0.030
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 2.5 to 3.5
0
Zinc (Zn), % 0
0.35 to 1.0