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AISI 309 Stainless Steel vs. AS41B Magnesium

AISI 309 stainless steel belongs to the iron alloys classification, while AS41B magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 309 stainless steel and the bottom bar is AS41B magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 34 to 47
6.0
Fatigue Strength, MPa 250 to 280
97
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 78
18
Shear Strength, MPa 420 to 470
120
Tensile Strength: Ultimate (UTS), MPa 600 to 710
210
Tensile Strength: Yield (Proof), MPa 260 to 350
140

Thermal Properties

Latent Heat of Fusion, J/g 290
370
Maximum Temperature: Mechanical, °C 980
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 16
68
Thermal Expansion, µm/m-K 15
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
17
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
92

Otherwise Unclassified Properties

Base Metal Price, % relative 19
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 3.6
23
Embodied Energy, MJ/kg 51
160
Embodied Water, L/kg 170
980

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
11
Resilience: Unit (Modulus of Resilience), kJ/m3 170 to 310
220
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
72
Strength to Weight: Axial, points 21 to 25
35
Strength to Weight: Bending, points 20 to 23
47
Thermal Diffusivity, mm2/s 4.3
41
Thermal Shock Resistance, points 14 to 16
13

Alloy Composition

Aluminum (Al), % 0
3.5 to 5.0
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 22 to 24
0
Copper (Cu), % 0
0 to 0.020
Iron (Fe), % 58 to 66
0 to 0.0035
Magnesium (Mg), % 0
92.7 to 95.7
Manganese (Mn), % 0 to 2.0
0.35 to 0.7
Nickel (Ni), % 12 to 15
0 to 0.0020
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0.5 to 1.5
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.12