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ISO-WD32250 Magnesium vs. ASTM A369 Grade FP91

ISO-WD32250 magnesium belongs to the magnesium alloys classification, while ASTM A369 grade FP91 belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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-WD32250 magnesium and the bottom bar is ASTM A369 grade FP91.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
190
Elongation at Break, % 4.5 to 8.6
19
Fatigue Strength, MPa 170 to 210
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
75
Shear Strength, MPa 180 to 190
410
Tensile Strength: Ultimate (UTS), MPa 310 to 330
670
Tensile Strength: Yield (Proof), MPa 240 to 290
460

Thermal Properties

Latent Heat of Fusion, J/g 340
270
Maximum Temperature: Mechanical, °C 120
600
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 550
1420
Specific Heat Capacity, J/kg-K 980
470
Thermal Conductivity, W/m-K 130
26
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 130
10

Otherwise Unclassified Properties

Base Metal Price, % relative 13
7.0
Density, g/cm3 1.8
7.8
Embodied Carbon, kg CO2/kg material 24
2.6
Embodied Energy, MJ/kg 160
37
Embodied Water, L/kg 950
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 14 to 26
110
Resilience: Unit (Modulus of Resilience), kJ/m3 630 to 930
560
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 67
25
Strength to Weight: Axial, points 49 to 51
24
Strength to Weight: Bending, points 58 to 60
22
Thermal Diffusivity, mm2/s 72
6.9
Thermal Shock Resistance, points 19 to 20
18

Alloy Composition


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Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0
0.080 to 0.12
Chromium (Cr), % 0
8.0 to 9.5
Iron (Fe), % 0
87.3 to 90.3
Magnesium (Mg), % 94.9 to 97.1
0
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0
0.2 to 0.5
Sulfur (S), % 0
0 to 0.025
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zinc (Zn), % 2.5 to 4.0
0
Zirconium (Zr), % 0.45 to 0.8
0 to 0.010
Residuals, % 0 to 0.3
0