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AZ31C Magnesium vs. N08904 Stainless Steel

AZ31C magnesium belongs to the magnesium alloys classification, while N08904 stainless steel belongs to the iron 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 AZ31C magnesium and the bottom bar is N08904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 12
38
Fatigue Strength, MPa 150
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
79
Shear Strength, MPa 130
370
Tensile Strength: Ultimate (UTS), MPa 260
540
Tensile Strength: Yield (Proof), MPa 200
240

Thermal Properties

Latent Heat of Fusion, J/g 350
300
Maximum Temperature: Mechanical, °C 110
1100
Melting Completion (Liquidus), °C 600
1440
Melting Onset (Solidus), °C 550
1390
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 130
12
Thermal Expansion, µm/m-K 26
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 19
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 98
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
32
Density, g/cm3 1.7
8.1
Embodied Carbon, kg CO2/kg material 23
5.8
Embodied Energy, MJ/kg 160
79
Embodied Water, L/kg 970
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 28
170
Resilience: Unit (Modulus of Resilience), kJ/m3 440
150
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 70
24
Strength to Weight: Axial, points 42
19
Strength to Weight: Bending, points 53
18
Thermal Diffusivity, mm2/s 74
3.1
Thermal Shock Resistance, points 16
12

Alloy Composition

Aluminum (Al), % 2.4 to 3.6
0
Carbon (C), % 0
0 to 0.020
Chromium (Cr), % 0
19 to 23
Copper (Cu), % 0 to 0.1
1.0 to 2.0
Iron (Fe), % 0
38.8 to 53
Magnesium (Mg), % 93.4 to 97
0
Manganese (Mn), % 0.15 to 1.0
0 to 2.0
Molybdenum (Mo), % 0
4.0 to 5.0
Nickel (Ni), % 0 to 0.030
23 to 28
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.1
0 to 1.0
Sulfur (S), % 0
0 to 0.035
Zinc (Zn), % 0.5 to 1.5
0
Residuals, % 0 to 0.3
0