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AZ91A Magnesium vs. EN 1.7380 Steel

AZ91A magnesium belongs to the magnesium alloys classification, while EN 1.7380 steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, 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 EN 1.7380 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
160 to 170
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
19 to 20
Fatigue Strength, MPa 99
200 to 230
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
74
Shear Strength, MPa 140
330 to 350
Tensile Strength: Ultimate (UTS), MPa 240
540 to 550
Tensile Strength: Yield (Proof), MPa 160
290 to 330

Thermal Properties

Latent Heat of Fusion, J/g 360
260
Maximum Temperature: Mechanical, °C 130
460
Melting Completion (Liquidus), °C 600
1470
Melting Onset (Solidus), °C 470
1430
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
39
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 52
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 12
3.8
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
1.8
Embodied Energy, MJ/kg 160
23
Embodied Water, L/kg 990
59

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
87 to 98
Resilience: Unit (Modulus of Resilience), kJ/m3 280
230 to 280
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
19 to 20
Strength to Weight: Bending, points 49
19
Thermal Diffusivity, mm2/s 42
11
Thermal Shock Resistance, points 14
15 to 16

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.080 to 0.14
Chromium (Cr), % 0
2.0 to 2.5
Copper (Cu), % 0 to 0.1
0 to 0.3
Iron (Fe), % 0
94.6 to 96.6
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.4 to 0.8
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 0 to 0.030
0
Nitrogen (N), % 0
0 to 0.012
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0
0 to 0.010
Zinc (Zn), % 0.35 to 1.0
0