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AISI 309S Stainless Steel vs. AZ92A Magnesium

AISI 309S stainless steel belongs to the iron alloys classification, while AZ92A magnesium belongs to the magnesium alloys. There are 30 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 309S stainless steel and the bottom bar is AZ92A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
47
Elongation at Break, % 42
2.1 to 6.8
Fatigue Strength, MPa 210
76 to 90
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 78
18
Shear Strength, MPa 400
97 to 160
Tensile Strength: Ultimate (UTS), MPa 580
170 to 270
Tensile Strength: Yield (Proof), MPa 230
83 to 140

Thermal Properties

Latent Heat of Fusion, J/g 290
350
Maximum Temperature: Mechanical, °C 1080
130
Melting Completion (Liquidus), °C 1420
590
Melting Onset (Solidus), °C 1370
440
Specific Heat Capacity, J/kg-K 480
980
Thermal Conductivity, W/m-K 15
44 to 58
Thermal Expansion, µm/m-K 16
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
11 to 12
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
53 to 62

Otherwise Unclassified Properties

Base Metal Price, % relative 19
12
Density, g/cm3 7.8
1.8
Embodied Carbon, kg CO2/kg material 3.6
22
Embodied Energy, MJ/kg 51
160
Embodied Water, L/kg 170
980

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
4.0 to 14
Resilience: Unit (Modulus of Resilience), kJ/m3 140
73 to 220
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
67
Strength to Weight: Axial, points 21
26 to 41
Strength to Weight: Bending, points 20
38 to 51
Thermal Diffusivity, mm2/s 4.0
25 to 33
Thermal Shock Resistance, points 13
10 to 16

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 22 to 24
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 58.1 to 66
0
Magnesium (Mg), % 0
86.7 to 90
Manganese (Mn), % 0 to 2.0
0.1 to 0.35
Nickel (Ni), % 12 to 15
0 to 0.010
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0 to 0.3
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
1.6 to 2.4
Residuals, % 0
0 to 0.3