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SAE-AISI 94B30 Steel vs. ZK51A Magnesium

SAE-AISI 94B30 steel belongs to the iron alloys classification, while ZK51A magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 94B30 steel and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
45
Elongation at Break, % 25
4.7
Fatigue Strength, MPa 220
62
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
18
Shear Strength, MPa 320
160
Tensile Strength: Ultimate (UTS), MPa 500
240
Tensile Strength: Yield (Proof), MPa 300
150

Thermal Properties

Latent Heat of Fusion, J/g 250
340
Maximum Temperature: Mechanical, °C 410
120
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1420
550
Specific Heat Capacity, J/kg-K 470
970
Thermal Conductivity, W/m-K 39
110
Thermal Expansion, µm/m-K 13
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
28
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
140

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
13
Density, g/cm3 7.8
1.8
Embodied Carbon, kg CO2/kg material 1.5
24
Embodied Energy, MJ/kg 20
160
Embodied Water, L/kg 49
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
10
Resilience: Unit (Modulus of Resilience), kJ/m3 250
260
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
64
Strength to Weight: Axial, points 18
36
Strength to Weight: Bending, points 18
47
Thermal Diffusivity, mm2/s 10
61
Thermal Shock Resistance, points 15
15

Alloy Composition

Boron (B), % 0.00050 to 0.0030
0
Carbon (C), % 0.28 to 0.33
0
Chromium (Cr), % 0.3 to 0.5
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 97 to 98.1
0
Magnesium (Mg), % 0
93.1 to 95.9
Manganese (Mn), % 0.75 to 1.0
0
Molybdenum (Mo), % 0.080 to 0.15
0
Nickel (Ni), % 0.3 to 0.6
0 to 0.010
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3