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ISO-WD32250 Magnesium vs. SAE-AISI H25 Steel

ISO-WD32250 magnesium belongs to the magnesium alloys classification, while SAE-AISI H25 steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (10, 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 SAE-AISI H25 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
79
Tensile Strength: Ultimate (UTS), MPa 310 to 330
710 to 1620

Thermal Properties

Latent Heat of Fusion, J/g 340
250
Melting Completion (Liquidus), °C 600
1750
Melting Onset (Solidus), °C 550
1700
Specific Heat Capacity, J/kg-K 980
420
Thermal Conductivity, W/m-K 130
26
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Base Metal Price, % relative 13
38
Density, g/cm3 1.8
9.1
Embodied Carbon, kg CO2/kg material 24
6.2
Embodied Energy, MJ/kg 160
93
Embodied Water, L/kg 950
83

Common Calculations

Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 67
22
Strength to Weight: Axial, points 49 to 51
22 to 50
Strength to Weight: Bending, points 58 to 60
20 to 34
Thermal Diffusivity, mm2/s 72
6.7
Thermal Shock Resistance, points 19 to 20
22 to 49

Alloy Composition


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Carbon (C), % 0
0.22 to 0.32
Chromium (Cr), % 0
3.8 to 4.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0
77.2 to 81.3
Magnesium (Mg), % 94.9 to 97.1
0
Manganese (Mn), % 0
0.15 to 0.4
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0
0.15 to 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
14 to 16
Vanadium (V), % 0
0.4 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