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SAE-AISI H25 Steel vs. ZK40A Magnesium

SAE-AISI H25 steel belongs to the iron alloys classification, while ZK40A magnesium belongs to the magnesium 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 SAE-AISI H25 steel and the bottom bar is ZK40A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 79
17
Tensile Strength: Ultimate (UTS), MPa 710 to 1620
280

Thermal Properties

Latent Heat of Fusion, J/g 250
340
Melting Completion (Liquidus), °C 1750
600
Melting Onset (Solidus), °C 1700
540
Specific Heat Capacity, J/kg-K 420
970
Thermal Conductivity, W/m-K 26
110
Thermal Expansion, µm/m-K 12
26

Otherwise Unclassified Properties

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

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
65
Strength to Weight: Axial, points 22 to 50
43
Strength to Weight: Bending, points 20 to 34
53
Thermal Diffusivity, mm2/s 6.7
62
Thermal Shock Resistance, points 22 to 49
17

Alloy Composition

Carbon (C), % 0.22 to 0.32
0
Chromium (Cr), % 3.8 to 4.5
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 77.2 to 81.3
0
Magnesium (Mg), % 0
94.2 to 96.1
Manganese (Mn), % 0.15 to 0.4
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.15 to 0.4
0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 14 to 16
0
Vanadium (V), % 0.4 to 0.6
0
Zinc (Zn), % 0
3.5 to 4.5
Zirconium (Zr), % 0
0.45 to 1.0
Residuals, % 0
0 to 0.3