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ISO-WD21150 Magnesium vs. ASTM Grade HP Steel

ISO-WD21150 magnesium belongs to the magnesium alloys classification, while ASTM grade HP steel belongs to the iron alloys. There are 26 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 ISO-WD21150 magnesium and the bottom bar is ASTM grade HP steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 5.7 to 11
5.1
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
78
Tensile Strength: Ultimate (UTS), MPa 240 to 290
490
Tensile Strength: Yield (Proof), MPa 120 to 200
260

Thermal Properties

Latent Heat of Fusion, J/g 350
320
Maximum Temperature: Mechanical, °C 110
1100
Melting Completion (Liquidus), °C 600
1370
Melting Onset (Solidus), °C 550
1330
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 100
12
Thermal Expansion, µm/m-K 27
16

Otherwise Unclassified Properties

Base Metal Price, % relative 12
34
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 23
5.8
Embodied Energy, MJ/kg 160
82
Embodied Water, L/kg 980
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15 to 24
21
Resilience: Unit (Modulus of Resilience), kJ/m3 160 to 460
170
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 70
25
Strength to Weight: Axial, points 40 to 48
17
Strength to Weight: Bending, points 52 to 58
17
Thermal Diffusivity, mm2/s 60
3.2
Thermal Shock Resistance, points 15 to 17
11

Alloy Composition

Aluminum (Al), % 2.4 to 3.6
0
Carbon (C), % 0
0.35 to 0.75
Chromium (Cr), % 0
24 to 28
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.0050
29.2 to 42.7
Magnesium (Mg), % 94 to 97
0
Manganese (Mn), % 0.15 to 0.4
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.0050
33 to 37
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.1
0 to 2.5
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 0.5 to 1.5
0
Residuals, % 0 to 0.3
0