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ASTM A372 Grade K Steel vs. AZ63A Magnesium

ASTM A372 grade K steel belongs to the iron alloys classification, while AZ63A magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 ASTM A372 grade K steel and the bottom bar is AZ63A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
46
Elongation at Break, % 23
2.2 to 8.0
Fatigue Strength, MPa 440
76 to 83
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
18
Shear Strength, MPa 490
110 to 160
Tensile Strength: Ultimate (UTS), MPa 780
190 to 270
Tensile Strength: Yield (Proof), MPa 620
81 to 120

Thermal Properties

Latent Heat of Fusion, J/g 250
350
Maximum Temperature: Mechanical, °C 440
120
Melting Completion (Liquidus), °C 1460
610
Melting Onset (Solidus), °C 1420
450
Specific Heat Capacity, J/kg-K 470
980
Thermal Conductivity, W/m-K 48
52 to 65
Thermal Expansion, µm/m-K 13
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
12 to 15
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
59 to 74

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
12
Density, g/cm3 7.9
1.8
Embodied Carbon, kg CO2/kg material 1.8
22
Embodied Energy, MJ/kg 24
150
Embodied Water, L/kg 57
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
3.7 to 16
Resilience: Unit (Modulus of Resilience), kJ/m3 1010
71 to 160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
66
Strength to Weight: Axial, points 27
29 to 41
Strength to Weight: Bending, points 24
40 to 51
Thermal Diffusivity, mm2/s 13
29 to 37
Thermal Shock Resistance, points 23
11 to 16

Alloy Composition

Aluminum (Al), % 0
5.3 to 6.7
Carbon (C), % 0 to 0.18
0
Chromium (Cr), % 1.0 to 1.8
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 93.4 to 96.6
0
Magnesium (Mg), % 0
88.6 to 92.1
Manganese (Mn), % 0.1 to 0.4
0.15 to 0.35
Molybdenum (Mo), % 0.2 to 0.6
0
Nickel (Ni), % 2.0 to 3.3
0 to 0.010
Phosphorus (P), % 0 to 0.015
0
Silicon (Si), % 0.15 to 0.35
0 to 0.3
Sulfur (S), % 0 to 0.010
0
Zinc (Zn), % 0
2.5 to 3.5
Residuals, % 0
0 to 0.3