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EN-MC21320 Magnesium vs. AWS ER70S-B2L

EN-MC21320 magnesium belongs to the magnesium alloys classification, while AWS ER70S-B2L belongs to the iron alloys. There are 27 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 EN-MC21320 magnesium and the bottom bar is AWS ER70S-B2L.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
190
Elongation at Break, % 7.5
22
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Tensile Strength: Ultimate (UTS), MPa 230
590
Tensile Strength: Yield (Proof), MPa 140
450

Thermal Properties

Latent Heat of Fusion, J/g 370
260
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 530
1420
Specific Heat Capacity, J/kg-K 1000
470
Thermal Conductivity, W/m-K 66
40
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 91
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 12
3.0
Density, g/cm3 1.6
7.8
Embodied Carbon, kg CO2/kg material 23
1.6
Embodied Energy, MJ/kg 160
21
Embodied Water, L/kg 980
54

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15
120
Resilience: Unit (Modulus of Resilience), kJ/m3 200
530
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 72
24
Strength to Weight: Axial, points 38
21
Strength to Weight: Bending, points 50
20
Thermal Diffusivity, mm2/s 40
11
Thermal Shock Resistance, points 13
17

Alloy Composition


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Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0
1.2 to 1.5
Copper (Cu), % 0 to 0.010
0 to 0.35
Iron (Fe), % 0 to 0.0050
95.3 to 97.6
Magnesium (Mg), % 92.5 to 95.9
0
Manganese (Mn), % 0.1 to 0.7
0.4 to 0.7
Molybdenum (Mo), % 0
0.4 to 0.65
Nickel (Ni), % 0 to 0.0020
0 to 0.2
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0.5 to 1.5
0.4 to 0.7
Sulfur (S), % 0
0 to 0.025
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.010
0 to 0.5