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AZ91B Magnesium vs. EN 1.4029 Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while EN 1.4029 stainless steel belongs to the iron alloys. There are 30 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 AZ91B magnesium and the bottom bar is EN 1.4029 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
10 to 20
Fatigue Strength, MPa 79
270 to 400
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
76
Shear Strength, MPa 140
440 to 550
Tensile Strength: Ultimate (UTS), MPa 240
700 to 930
Tensile Strength: Yield (Proof), MPa 160
410 to 740

Thermal Properties

Latent Heat of Fusion, J/g 360
270
Maximum Temperature: Mechanical, °C 130
750
Melting Completion (Liquidus), °C 600
1440
Melting Onset (Solidus), °C 470
1400
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
30
Thermal Expansion, µm/m-K 26
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
3.1
Electrical Conductivity: Equal Weight (Specific), % IACS 58
3.7

Otherwise Unclassified Properties

Base Metal Price, % relative 12
7.0
Density, g/cm3 1.7
7.7
Embodied Carbon, kg CO2/kg material 22
2.0
Embodied Energy, MJ/kg 160
28
Embodied Water, L/kg 990
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
89 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 280
440 to 1410
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
25 to 33
Strength to Weight: Bending, points 49
23 to 27
Thermal Diffusivity, mm2/s 42
8.1
Thermal Shock Resistance, points 14
26 to 34

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.25 to 0.32
Chromium (Cr), % 0
12 to 13.5
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
82.8 to 87.6
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.6
Nickel (Ni), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0.15 to 0.25
Zinc (Zn), % 0.35 to 1.0
0