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ISO-WD32250 Magnesium vs. S43940 Stainless Steel

ISO-WD32250 magnesium belongs to the magnesium alloys classification, while S43940 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 S43940 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 4.5 to 8.6
21
Fatigue Strength, MPa 170 to 210
180
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
77
Shear Strength, MPa 180 to 190
310
Tensile Strength: Ultimate (UTS), MPa 310 to 330
490
Tensile Strength: Yield (Proof), MPa 240 to 290
280

Thermal Properties

Latent Heat of Fusion, J/g 340
280
Maximum Temperature: Mechanical, °C 120
890
Melting Completion (Liquidus), °C 600
1440
Melting Onset (Solidus), °C 550
1400
Specific Heat Capacity, J/kg-K 980
480
Thermal Conductivity, W/m-K 130
25
Thermal Expansion, µm/m-K 26
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 130
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 13
12
Density, g/cm3 1.8
7.7
Embodied Carbon, kg CO2/kg material 24
2.6
Embodied Energy, MJ/kg 160
38
Embodied Water, L/kg 950
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 14 to 26
86
Resilience: Unit (Modulus of Resilience), kJ/m3 630 to 930
200
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 67
25
Strength to Weight: Axial, points 49 to 51
18
Strength to Weight: Bending, points 58 to 60
18
Thermal Diffusivity, mm2/s 72
6.8
Thermal Shock Resistance, points 19 to 20
18

Alloy Composition


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Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
17.5 to 18.5
Iron (Fe), % 0
78.2 to 82.1
Magnesium (Mg), % 94.9 to 97.1
0
Manganese (Mn), % 0
0 to 1.0
Niobium (Nb), % 0
0.3 to 0.6
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0
0.1 to 0.6
Zinc (Zn), % 2.5 to 4.0
0
Zirconium (Zr), % 0.45 to 0.8
0
Residuals, % 0 to 0.3
0