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AZ91B Magnesium vs. EN 1.4469 Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while EN 1.4469 stainless steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (7, 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 1.4469 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
210
Elongation at Break, % 5.0
25
Fatigue Strength, MPa 79
380
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 18
81
Tensile Strength: Ultimate (UTS), MPa 240
740
Tensile Strength: Yield (Proof), MPa 160
550

Thermal Properties

Latent Heat of Fusion, J/g 360
300
Maximum Temperature: Mechanical, °C 130
1100
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 470
1400
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
17
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 58
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
21
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 22
4.1
Embodied Energy, MJ/kg 160
57
Embodied Water, L/kg 990
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
170
Resilience: Unit (Modulus of Resilience), kJ/m3 280
730
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
26
Strength to Weight: Bending, points 49
23
Thermal Diffusivity, mm2/s 42
4.6
Thermal Shock Resistance, points 14
20

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
25 to 27
Copper (Cu), % 0 to 0.35
0 to 1.3
Iron (Fe), % 0
56.4 to 65.9
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 1.0
Molybdenum (Mo), % 0
3.0 to 5.0
Nickel (Ni), % 0 to 0.030
6.0 to 8.0
Nitrogen (N), % 0
0.12 to 0.22
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.025
Zinc (Zn), % 0.35 to 1.0
0