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ASTM Grade HF Steel vs. AZ91A Magnesium

ASTM grade HF steel belongs to the iron alloys classification, while AZ91A 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 ASTM grade HF steel and the bottom bar is AZ91A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
63
Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 29
5.0
Fatigue Strength, MPa 200
99
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Tensile Strength: Ultimate (UTS), MPa 550
240
Tensile Strength: Yield (Proof), MPa 270
160

Thermal Properties

Latent Heat of Fusion, J/g 300
360
Maximum Temperature: Mechanical, °C 1000
130
Melting Completion (Liquidus), °C 1410
600
Melting Onset (Solidus), °C 1370
470
Specific Heat Capacity, J/kg-K 480
990
Thermal Conductivity, W/m-K 16
73
Thermal Expansion, µm/m-K 16
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
10
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
52

Otherwise Unclassified Properties

Base Metal Price, % relative 17
12
Density, g/cm3 7.7
1.7
Embodied Carbon, kg CO2/kg material 3.2
22
Embodied Energy, MJ/kg 46
160
Embodied Water, L/kg 150
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
11
Resilience: Unit (Modulus of Resilience), kJ/m3 180
280
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 20
38
Strength to Weight: Bending, points 19
49
Thermal Diffusivity, mm2/s 4.2
42
Thermal Shock Resistance, points 12
14

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0.2 to 0.4
0
Chromium (Cr), % 18 to 23
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 60 to 73.8
0
Magnesium (Mg), % 0
88.2 to 91.2
Manganese (Mn), % 0 to 2.0
0.13 to 0.5
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 8.0 to 12
0 to 0.030
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0.35 to 1.0