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ASTM A372 Grade K Steel vs. AZ91A Magnesium

ASTM A372 grade K steel belongs to the iron alloys classification, while AZ91A magnesium belongs to the magnesium alloys. There are 31 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 AZ91A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
63
Elastic (Young's, Tensile) Modulus, GPa 190
46
Elongation at Break, % 23
5.0
Fatigue Strength, MPa 440
99
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
18
Shear Strength, MPa 490
140
Tensile Strength: Ultimate (UTS), MPa 780
240
Tensile Strength: Yield (Proof), MPa 620
160

Thermal Properties

Latent Heat of Fusion, J/g 250
360
Maximum Temperature: Mechanical, °C 440
130
Melting Completion (Liquidus), °C 1460
600
Melting Onset (Solidus), °C 1420
470
Specific Heat Capacity, J/kg-K 470
990
Thermal Conductivity, W/m-K 48
73
Thermal Expansion, µm/m-K 13
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
10
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
52

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
12
Density, g/cm3 7.9
1.7
Embodied Carbon, kg CO2/kg material 1.8
22
Embodied Energy, MJ/kg 24
160
Embodied Water, L/kg 57
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
11
Resilience: Unit (Modulus of Resilience), kJ/m3 1010
280
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
69
Strength to Weight: Axial, points 27
38
Strength to Weight: Bending, points 24
49
Thermal Diffusivity, mm2/s 13
42
Thermal Shock Resistance, points 23
14

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.18
0
Chromium (Cr), % 1.0 to 1.8
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 93.4 to 96.6
0
Magnesium (Mg), % 0
88.2 to 91.2
Manganese (Mn), % 0.1 to 0.4
0.13 to 0.5
Molybdenum (Mo), % 0.2 to 0.6
0
Nickel (Ni), % 2.0 to 3.3
0 to 0.030
Phosphorus (P), % 0 to 0.015
0
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.010
0
Zinc (Zn), % 0
0.35 to 1.0