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AISI 405 Stainless Steel vs. R30016 Cobalt

AISI 405 stainless steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is AISI 405 stainless steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 22
8.4
Fatigue Strength, MPa 130
290
Poisson's Ratio 0.28
0.28
Reduction in Area, % 51
8.0
Shear Modulus, GPa 76
85
Tensile Strength: Ultimate (UTS), MPa 470
1010
Tensile Strength: Yield (Proof), MPa 200
580

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1530
1360
Melting Onset (Solidus), °C 1480
1270
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 30
15
Thermal Expansion, µm/m-K 11
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 2.0
7.7
Embodied Energy, MJ/kg 28
110
Embodied Water, L/kg 100
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
72
Resilience: Unit (Modulus of Resilience), kJ/m3 100
770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
33
Strength to Weight: Bending, points 17
26
Thermal Diffusivity, mm2/s 8.1
3.9
Thermal Shock Resistance, points 16
24

Alloy Composition

Aluminum (Al), % 0.1 to 0.3
0
Carbon (C), % 0 to 0.080
0.9 to 1.4
Chromium (Cr), % 11.5 to 14.5
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 82.5 to 88.4
0 to 3.0
Manganese (Mn), % 0 to 1.0
0.5 to 2.0
Molybdenum (Mo), % 0
0 to 1.5
Nickel (Ni), % 0 to 0.6
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0.2 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
3.5 to 5.5