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Annealed S35000 Stainless Steel vs. AZ31B-O Magnesium

Annealed S35000 stainless steel belongs to the iron alloys classification, while AZ31B-O magnesium belongs to the magnesium alloys. There are 30 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 annealed S35000 stainless steel and the bottom bar is AZ31B-O magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 14
12
Fatigue Strength, MPa 380
120
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
17
Shear Strength, MPa 950
140
Tensile Strength: Ultimate (UTS), MPa 1570
240
Tensile Strength: Yield (Proof), MPa 660
120

Thermal Properties

Latent Heat of Fusion, J/g 280
350
Maximum Temperature: Mechanical, °C 900
150
Melting Completion (Liquidus), °C 1460
600
Melting Onset (Solidus), °C 1410
600
Specific Heat Capacity, J/kg-K 470
990
Thermal Conductivity, W/m-K 16
100
Thermal Expansion, µm/m-K 11
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
18
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
95

Otherwise Unclassified Properties

Base Metal Price, % relative 14
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 3.2
23
Embodied Energy, MJ/kg 44
160
Embodied Water, L/kg 130
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
25
Resilience: Unit (Modulus of Resilience), kJ/m3 1070
170
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
70
Strength to Weight: Axial, points 56
39
Strength to Weight: Bending, points 38
50
Thermal Diffusivity, mm2/s 4.4
62
Thermal Shock Resistance, points 51
14

Alloy Composition

Aluminum (Al), % 0
2.4 to 3.6
Calcium (Ca), % 0
0 to 0.040
Carbon (C), % 0.070 to 0.11
0
Chromium (Cr), % 16 to 17
0
Copper (Cu), % 0
0 to 0.050
Iron (Fe), % 72.7 to 76.9
0 to 0.050
Magnesium (Mg), % 0
93.6 to 97.1
Manganese (Mn), % 0.5 to 1.3
0.050 to 1.0
Molybdenum (Mo), % 2.5 to 3.2
0
Nickel (Ni), % 4.0 to 5.0
0 to 0.0050
Nitrogen (N), % 0.070 to 0.13
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
Zinc (Zn), % 0
0.5 to 1.5
Residuals, % 0
0 to 0.3