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ACI-ASTM CA40 Steel vs. AM50A Magnesium

ACI-ASTM CA40 steel belongs to the iron alloys classification, while AM50A 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 ACI-ASTM CA40 steel and the bottom bar is AM50A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
58
Elastic (Young's, Tensile) Modulus, GPa 190
45
Elongation at Break, % 10
11
Fatigue Strength, MPa 460
70
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
17
Tensile Strength: Ultimate (UTS), MPa 910
210
Tensile Strength: Yield (Proof), MPa 860
120

Thermal Properties

Latent Heat of Fusion, J/g 280
350
Maximum Temperature: Mechanical, °C 750
120
Melting Completion (Liquidus), °C 1440
620
Melting Onset (Solidus), °C 1500
570
Specific Heat Capacity, J/kg-K 480
1000
Thermal Conductivity, W/m-K 25
65
Thermal Expansion, µm/m-K 10
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
16
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
88

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
12
Density, g/cm3 7.7
1.7
Embodied Carbon, kg CO2/kg material 2.0
23
Embodied Energy, MJ/kg 28
160
Embodied Water, L/kg 100
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
19
Resilience: Unit (Modulus of Resilience), kJ/m3 1910
150
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
71
Strength to Weight: Axial, points 33
35
Strength to Weight: Bending, points 27
47
Thermal Diffusivity, mm2/s 6.7
39
Thermal Shock Resistance, points 33
13

Alloy Composition

Aluminum (Al), % 0
4.4 to 5.4
Carbon (C), % 0.2 to 0.4
0
Chromium (Cr), % 11.5 to 14
0
Copper (Cu), % 0
0 to 0.010
Iron (Fe), % 81.5 to 88.3
0 to 0.0040
Magnesium (Mg), % 0
93.7 to 95.3
Manganese (Mn), % 0 to 1.0
0.26 to 0.6
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 1.0
0 to 0.0020
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.5
0 to 0.1
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0 to 0.22