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ACI-ASTM CK35MN Steel vs. AZ91B Magnesium

ACI-ASTM CK35MN steel belongs to the iron alloys classification, while AZ91B magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 CK35MN steel and the bottom bar is AZ91B magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
63
Elastic (Young's, Tensile) Modulus, GPa 210
46
Elongation at Break, % 40
5.0
Fatigue Strength, MPa 270
79
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 81
18
Tensile Strength: Ultimate (UTS), MPa 650
240
Tensile Strength: Yield (Proof), MPa 310
160

Thermal Properties

Latent Heat of Fusion, J/g 310
360
Maximum Temperature: Mechanical, °C 1100
130
Melting Completion (Liquidus), °C 1460
600
Melting Onset (Solidus), °C 1410
470
Specific Heat Capacity, J/kg-K 470
990
Thermal Conductivity, W/m-K 12
73
Thermal Expansion, µm/m-K 16
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
11
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
58

Otherwise Unclassified Properties

Base Metal Price, % relative 31
12
Density, g/cm3 8.0
1.7
Embodied Carbon, kg CO2/kg material 5.9
22
Embodied Energy, MJ/kg 81
160
Embodied Water, L/kg 210
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
11
Resilience: Unit (Modulus of Resilience), kJ/m3 240
280
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 22
38
Strength to Weight: Bending, points 21
49
Thermal Diffusivity, mm2/s 3.3
42
Thermal Shock Resistance, points 14
14

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.035
0
Chromium (Cr), % 22 to 24
0
Copper (Cu), % 0 to 0.4
0 to 0.35
Iron (Fe), % 43.4 to 51.8
0
Magnesium (Mg), % 0
87.9 to 91.2
Manganese (Mn), % 0 to 2.0
0.13 to 0.5
Molybdenum (Mo), % 6.0 to 6.8
0
Nickel (Ni), % 20 to 22
0 to 0.030
Nitrogen (N), % 0.21 to 0.32
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.020
0
Zinc (Zn), % 0
0.35 to 1.0