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Annealed S45500 Stainless Steel vs. AZ31B-O Magnesium

Annealed S45500 stainless steel belongs to the iron alloys classification, while AZ31B-O magnesium belongs to the magnesium alloys. There are 27 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 annealed S45500 stainless steel and the bottom bar is AZ31B-O magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
56
Elastic (Young's, Tensile) Modulus, GPa 190
45
Elongation at Break, % 3.4
12
Fatigue Strength, MPa 570
120
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
17
Shear Strength, MPa 790
140
Tensile Strength: Ultimate (UTS), MPa 1370
240
Tensile Strength: Yield (Proof), MPa 1240
120

Thermal Properties

Latent Heat of Fusion, J/g 270
350
Maximum Temperature: Mechanical, °C 760
150
Melting Completion (Liquidus), °C 1440
600
Melting Onset (Solidus), °C 1400
600
Specific Heat Capacity, J/kg-K 470
990
Thermal Expansion, µm/m-K 11
26

Otherwise Unclassified Properties

Base Metal Price, % relative 17
12
Density, g/cm3 7.9
1.7
Embodied Carbon, kg CO2/kg material 3.8
23
Embodied Energy, MJ/kg 57
160
Embodied Water, L/kg 120
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 45
25
Resilience: Unit (Modulus of Resilience), kJ/m3 4000
170
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
70
Strength to Weight: Axial, points 48
39
Strength to Weight: Bending, points 35
50
Thermal Shock Resistance, points 48
14

Alloy Composition

Aluminum (Al), % 0
2.4 to 3.6
Calcium (Ca), % 0
0 to 0.040
Carbon (C), % 0 to 0.050
0
Chromium (Cr), % 11 to 12.5
0
Copper (Cu), % 1.5 to 2.5
0 to 0.050
Iron (Fe), % 71.5 to 79.2
0 to 0.050
Magnesium (Mg), % 0
93.6 to 97.1
Manganese (Mn), % 0 to 0.5
0.050 to 1.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 7.5 to 9.5
0 to 0.0050
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.5
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0 to 0.5
0
Titanium (Ti), % 0.8 to 1.4
0
Zinc (Zn), % 0
0.5 to 1.5
Residuals, % 0
0 to 0.3