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AZ91A Magnesium vs. ASTM Grade HP Steel

AZ91A magnesium belongs to the magnesium alloys classification, while ASTM grade HP steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, 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 AZ91A magnesium and the bottom bar is ASTM grade HP steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
140
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
5.1
Fatigue Strength, MPa 99
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
78
Tensile Strength: Ultimate (UTS), MPa 240
490
Tensile Strength: Yield (Proof), MPa 160
260

Thermal Properties

Latent Heat of Fusion, J/g 360
320
Maximum Temperature: Mechanical, °C 130
1100
Melting Completion (Liquidus), °C 600
1370
Melting Onset (Solidus), °C 470
1330
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
12
Thermal Expansion, µm/m-K 26
16

Otherwise Unclassified Properties

Base Metal Price, % relative 12
34
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
5.8
Embodied Energy, MJ/kg 160
82
Embodied Water, L/kg 990
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
21
Resilience: Unit (Modulus of Resilience), kJ/m3 280
170
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
17
Strength to Weight: Bending, points 49
17
Thermal Diffusivity, mm2/s 42
3.2
Thermal Shock Resistance, points 14
11

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.35 to 0.75
Chromium (Cr), % 0
24 to 28
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
29.2 to 42.7
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.030
33 to 37
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 2.5
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 0.35 to 1.0
0