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R30016 Cobalt vs. EN 1.4981 Stainless Steel

R30016 cobalt belongs to the cobalt alloys classification, while EN 1.4981 stainless steel belongs to the iron alloys. They have a modest 22% 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 (11, in this case) are not shown.

For each property being compared, the top bar is R30016 cobalt and the bottom bar is EN 1.4981 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 8.4
39
Fatigue Strength, MPa 290
210
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 1010
610
Tensile Strength: Yield (Proof), MPa 580
240

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1440
Melting Onset (Solidus), °C 1270
1400
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 14
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 7.7
4.8
Embodied Energy, MJ/kg 110
67
Embodied Water, L/kg 500
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 72
190
Resilience: Unit (Modulus of Resilience), kJ/m3 770
150
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33
21
Strength to Weight: Bending, points 26
20
Thermal Diffusivity, mm2/s 3.9
4.3
Thermal Shock Resistance, points 24
14

Alloy Composition

Carbon (C), % 0.9 to 1.4
0.040 to 0.1
Chromium (Cr), % 28 to 32
15.5 to 17.5
Cobalt (Co), % 49.6 to 66.9
0
Iron (Fe), % 0 to 3.0
59.6 to 66.7
Manganese (Mn), % 0.5 to 2.0
0 to 1.5
Molybdenum (Mo), % 0 to 1.5
1.6 to 2.0
Nickel (Ni), % 0 to 3.0
15.5 to 17.5
Niobium (Nb), % 0
0.4 to 1.2
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0.2 to 2.0
0.3 to 0.6
Sulfur (S), % 0
0 to 0.015
Tungsten (W), % 3.5 to 5.5
0