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R30016 Cobalt vs. EN 1.4865 Stainless Steel

R30016 cobalt belongs to the cobalt alloys classification, while EN 1.4865 stainless steel belongs to the iron alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30016 cobalt and the bottom bar is EN 1.4865 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 8.4
6.8
Fatigue Strength, MPa 290
120
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
76
Tensile Strength: Ultimate (UTS), MPa 1010
470
Tensile Strength: Yield (Proof), MPa 580
250

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1380
Melting Onset (Solidus), °C 1270
1330
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 14
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
1.9

Otherwise Unclassified Properties

Density, g/cm3 8.5
8.0
Embodied Carbon, kg CO2/kg material 7.7
5.8
Embodied Energy, MJ/kg 110
81
Embodied Water, L/kg 500
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 72
27
Resilience: Unit (Modulus of Resilience), kJ/m3 770
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33
16
Strength to Weight: Bending, points 26
17
Thermal Diffusivity, mm2/s 3.9
3.1
Thermal Shock Resistance, points 24
11

Alloy Composition

Carbon (C), % 0.9 to 1.4
0.3 to 0.5
Chromium (Cr), % 28 to 32
18 to 21
Cobalt (Co), % 49.6 to 66.9
0
Iron (Fe), % 0 to 3.0
34.4 to 44.7
Manganese (Mn), % 0.5 to 2.0
0 to 2.0
Molybdenum (Mo), % 0 to 1.5
0 to 0.5
Nickel (Ni), % 0 to 3.0
36 to 39
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.2 to 2.0
1.0 to 2.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 3.5 to 5.5
0