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AISI 409 Stainless Steel vs. AS41A Magnesium

AISI 409 stainless steel belongs to the iron alloys classification, while AS41A magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 409 stainless steel and the bottom bar is AS41A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
45
Elongation at Break, % 24
11
Fatigue Strength, MPa 140
100
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
17
Shear Strength, MPa 270
130
Tensile Strength: Ultimate (UTS), MPa 420
230
Tensile Strength: Yield (Proof), MPa 200
140

Thermal Properties

Latent Heat of Fusion, J/g 270
370
Maximum Temperature: Mechanical, °C 710
110
Melting Completion (Liquidus), °C 1450
620
Melting Onset (Solidus), °C 1400
570
Specific Heat Capacity, J/kg-K 480
1000
Thermal Conductivity, W/m-K 25
68
Thermal Expansion, µm/m-K 11
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
17
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
92

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
12
Density, g/cm3 7.7
1.6
Embodied Carbon, kg CO2/kg material 2.0
23
Embodied Energy, MJ/kg 28
160
Embodied Water, L/kg 94
980

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
21
Resilience: Unit (Modulus of Resilience), kJ/m3 100
220
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
72
Strength to Weight: Axial, points 15
38
Strength to Weight: Bending, points 16
50
Thermal Diffusivity, mm2/s 6.7
41
Thermal Shock Resistance, points 15
14

Alloy Composition

Aluminum (Al), % 0
3.5 to 5.0
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 10.5 to 11.7
0
Copper (Cu), % 0
0 to 0.060
Iron (Fe), % 84.9 to 89.5
0
Magnesium (Mg), % 0
92.8 to 95.8
Manganese (Mn), % 0 to 1.0
0.2 to 0.5
Nickel (Ni), % 0 to 0.5
0 to 0.030
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0.5 to 1.5
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0 to 0.75
0
Zinc (Zn), % 0
0 to 0.12