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ASTM Grade LC9 Steel vs. AZ91A Magnesium

ASTM grade LC9 steel belongs to the iron alloys classification, while AZ91A magnesium belongs to the magnesium alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, 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 grade LC9 steel and the bottom bar is AZ91A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
63
Elastic (Young's, Tensile) Modulus, GPa 190
46
Elongation at Break, % 22
5.0
Fatigue Strength, MPa 420
99
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
18
Tensile Strength: Ultimate (UTS), MPa 660
240
Tensile Strength: Yield (Proof), MPa 590
160

Thermal Properties

Latent Heat of Fusion, J/g 260
360
Maximum Temperature: Mechanical, °C 430
130
Melting Completion (Liquidus), °C 1450
600
Melting Onset (Solidus), °C 1410
470
Specific Heat Capacity, J/kg-K 470
990
Thermal Expansion, µm/m-K 13
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
10
Electrical Conductivity: Equal Weight (Specific), % IACS 10
52

Otherwise Unclassified Properties

Base Metal Price, % relative 8.0
12
Density, g/cm3 7.9
1.7
Embodied Carbon, kg CO2/kg material 2.3
22
Embodied Energy, MJ/kg 31
160
Embodied Water, L/kg 65
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
11
Resilience: Unit (Modulus of Resilience), kJ/m3 920
280
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
69
Strength to Weight: Axial, points 23
38
Strength to Weight: Bending, points 21
49
Thermal Shock Resistance, points 20
14

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.13
0
Chromium (Cr), % 0 to 0.5
0
Copper (Cu), % 0 to 0.3
0 to 0.1
Iron (Fe), % 87.4 to 91.5
0
Magnesium (Mg), % 0
88.2 to 91.2
Manganese (Mn), % 0 to 0.9
0.13 to 0.5
Molybdenum (Mo), % 0 to 0.2
0
Nickel (Ni), % 8.5 to 10
0 to 0.030
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.45
0 to 0.5
Sulfur (S), % 0 to 0.045
0
Vanadium (V), % 0 to 0.030
0
Zinc (Zn), % 0
0.35 to 1.0