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AZ91B Magnesium vs. S13800 Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while S13800 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (6, 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 S13800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
290 to 480
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
11 to 18
Fatigue Strength, MPa 79
410 to 870
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
77
Shear Strength, MPa 140
610 to 1030
Tensile Strength: Ultimate (UTS), MPa 240
980 to 1730
Tensile Strength: Yield (Proof), MPa 160
660 to 1580

Thermal Properties

Latent Heat of Fusion, J/g 360
280
Maximum Temperature: Mechanical, °C 130
810
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 470
1410
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
16
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 58
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 12
15
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
3.4
Embodied Energy, MJ/kg 160
46
Embodied Water, L/kg 990
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
150 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 280
1090 to 5490
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
35 to 61
Strength to Weight: Bending, points 49
28 to 41
Thermal Diffusivity, mm2/s 42
4.3
Thermal Shock Resistance, points 14
33 to 58

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0.9 to 1.4
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0
12.3 to 13.2
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
73.6 to 77.3
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 0.2
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0 to 0.030
7.5 to 8.5
Nitrogen (N), % 0
0 to 0.010
Phosphorus (P), % 0
0 to 0.010
Silicon (Si), % 0 to 0.5
0 to 0.1
Sulfur (S), % 0
0 to 0.0080
Zinc (Zn), % 0.35 to 1.0
0