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ISO-WD32250 Magnesium vs. S32750 Stainless Steel

ISO-WD32250 magnesium belongs to the magnesium alloys classification, while S32750 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 ISO-WD32250 magnesium and the bottom bar is S32750 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
210
Elongation at Break, % 4.5 to 8.6
17
Fatigue Strength, MPa 170 to 210
360
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 17
81
Shear Strength, MPa 180 to 190
530
Tensile Strength: Ultimate (UTS), MPa 310 to 330
860
Tensile Strength: Yield (Proof), MPa 240 to 290
590

Thermal Properties

Latent Heat of Fusion, J/g 340
300
Maximum Temperature: Mechanical, °C 120
1100
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 550
1400
Specific Heat Capacity, J/kg-K 980
480
Thermal Conductivity, W/m-K 130
15
Thermal Expansion, µm/m-K 26
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 130
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 13
21
Density, g/cm3 1.8
7.8
Embodied Carbon, kg CO2/kg material 24
4.1
Embodied Energy, MJ/kg 160
56
Embodied Water, L/kg 950
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 14 to 26
130
Resilience: Unit (Modulus of Resilience), kJ/m3 630 to 930
860
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 67
25
Strength to Weight: Axial, points 49 to 51
31
Strength to Weight: Bending, points 58 to 60
26
Thermal Diffusivity, mm2/s 72
4.0
Thermal Shock Resistance, points 19 to 20
25

Alloy Composition


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Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
24 to 26
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 0
58.1 to 66.8
Magnesium (Mg), % 94.9 to 97.1
0
Manganese (Mn), % 0
0 to 1.2
Molybdenum (Mo), % 0
3.0 to 5.0
Nickel (Ni), % 0
6.0 to 8.0
Nitrogen (N), % 0
0.24 to 0.32
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0
0 to 0.8
Sulfur (S), % 0
0 to 0.020
Zinc (Zn), % 2.5 to 4.0
0
Zirconium (Zr), % 0.45 to 0.8
0
Residuals, % 0 to 0.3
0