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ZK51A Magnesium vs. ASTM A148 Cast Steel

ZK51A magnesium belongs to the magnesium alloys classification, while ASTM A148 cast steel belongs to the iron alloys. There are 29 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 ZK51A magnesium and the bottom bar is ASTM A148 cast steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
190
Elongation at Break, % 4.7
5.7 to 25
Fatigue Strength, MPa 62
280 to 670
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Tensile Strength: Ultimate (UTS), MPa 240
630 to 1300
Tensile Strength: Yield (Proof), MPa 150
390 to 1160

Thermal Properties

Latent Heat of Fusion, J/g 340
250
Maximum Temperature: Mechanical, °C 120
400 to 430
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 550
1420
Specific Heat Capacity, J/kg-K 970
470
Thermal Conductivity, W/m-K 110
37 to 47
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 28
7.3 to 7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 140
8.3 to 8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 13
2.3 to 3.3
Density, g/cm3 1.8
7.8
Embodied Carbon, kg CO2/kg material 24
1.5 to 1.7
Embodied Energy, MJ/kg 160
20 to 22
Embodied Water, L/kg 940
48 to 53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 10
71 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 260
400 to 3570
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 64
24
Strength to Weight: Axial, points 36
22 to 46
Strength to Weight: Bending, points 47
21 to 34
Thermal Diffusivity, mm2/s 61
9.9 to 13
Thermal Shock Resistance, points 15
18 to 38