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ACI-ASTM CN7M Steel vs. AM60B Magnesium

ACI-ASTM CN7M steel belongs to the iron alloys classification, while AM60B 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 CN7M steel and the bottom bar is AM60B magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
62
Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 44
11
Fatigue Strength, MPa 190
96
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
17
Tensile Strength: Ultimate (UTS), MPa 480
230
Tensile Strength: Yield (Proof), MPa 200
130

Thermal Properties

Latent Heat of Fusion, J/g 310
350
Maximum Temperature: Mechanical, °C 1100
120
Melting Completion (Liquidus), °C 1410
620
Melting Onset (Solidus), °C 1450
540
Specific Heat Capacity, J/kg-K 470
1000
Thermal Conductivity, W/m-K 21
61
Thermal Expansion, µm/m-K 15
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
13
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
72

Otherwise Unclassified Properties

Base Metal Price, % relative 32
12
Density, g/cm3 8.1
1.7
Embodied Carbon, kg CO2/kg material 5.6
23
Embodied Energy, MJ/kg 78
160
Embodied Water, L/kg 210
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
21
Resilience: Unit (Modulus of Resilience), kJ/m3 110
190
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
71
Strength to Weight: Axial, points 17
38
Strength to Weight: Bending, points 17
50
Thermal Diffusivity, mm2/s 5.6
37
Thermal Shock Resistance, points 12
14

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.5
Carbon (C), % 0 to 0.070
0
Chromium (Cr), % 19 to 22
0
Copper (Cu), % 3.0 to 4.0
0 to 0.010
Iron (Fe), % 37.4 to 48.5
0 to 0.0050
Magnesium (Mg), % 0
92.6 to 94.3
Manganese (Mn), % 0 to 1.5
0.24 to 0.6
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 27.5 to 30.5
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