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ASTM A369 Grade FP91 vs. EN-MC21120 Magnesium

ASTM A369 grade FP91 belongs to the iron alloys classification, while EN-MC21120 magnesium belongs to the magnesium alloys. There are 31 material properties with values for both materials. Properties with values for just one material (1, 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 A369 grade FP91 and the bottom bar is EN-MC21120 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
63 to 75
Elastic (Young's, Tensile) Modulus, GPa 190
46
Elongation at Break, % 19
2.2 to 6.7
Fatigue Strength, MPa 320
84 to 96
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
18
Shear Strength, MPa 410
110 to 160
Tensile Strength: Ultimate (UTS), MPa 670
200 to 270
Tensile Strength: Yield (Proof), MPa 460
130 to 170

Thermal Properties

Latent Heat of Fusion, J/g 270
350
Maximum Temperature: Mechanical, °C 600
130
Melting Completion (Liquidus), °C 1460
600
Melting Onset (Solidus), °C 1420
490
Specific Heat Capacity, J/kg-K 470
990
Thermal Conductivity, W/m-K 26
76
Thermal Expansion, µm/m-K 13
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
11
Electrical Conductivity: Equal Weight (Specific), % IACS 10
59

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 2.6
22
Embodied Energy, MJ/kg 37
160
Embodied Water, L/kg 88
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
5.0 to 15
Resilience: Unit (Modulus of Resilience), kJ/m3 560
180 to 320
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 24
31 to 43
Strength to Weight: Bending, points 22
43 to 53
Thermal Diffusivity, mm2/s 6.9
44
Thermal Shock Resistance, points 18
11 to 16

Alloy Composition

Aluminum (Al), % 0 to 0.020
8.3 to 9.7
Carbon (C), % 0.080 to 0.12
0
Chromium (Cr), % 8.0 to 9.5
0
Copper (Cu), % 0
0 to 0.030
Iron (Fe), % 87.3 to 90.3
0 to 0.0050
Magnesium (Mg), % 0
88.6 to 91.3
Manganese (Mn), % 0.3 to 0.6
0.1 to 0.5
Molybdenum (Mo), % 0.85 to 1.1
0
Nickel (Ni), % 0 to 0.4
0 to 0.0020
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0.2 to 0.5
0 to 0.2
Sulfur (S), % 0 to 0.025
0
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zinc (Zn), % 0
0.35 to 1.0
Zirconium (Zr), % 0 to 0.010
0
Residuals, % 0
0 to 0.010