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R30816 Cobalt vs. EN 1.4515 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4515 stainless steel belongs to the iron alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is EN 1.4515 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
25
Fatigue Strength, MPa 250
380
Poisson's Ratio 0.3
0.27
Shear Modulus, GPa 81
80
Tensile Strength: Ultimate (UTS), MPa 1020
730
Tensile Strength: Yield (Proof), MPa 460
550

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1540
1440
Melting Onset (Solidus), °C 1460
1390
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
3.8
Embodied Energy, MJ/kg 320
53
Embodied Water, L/kg 440
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
170
Resilience: Unit (Modulus of Resilience), kJ/m3 510
730
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
26
Strength to Weight: Bending, points 25
23
Thermal Diffusivity, mm2/s 3.3
4.3
Thermal Shock Resistance, points 28
20

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.030
Chromium (Cr), % 19 to 21
24.5 to 26.5
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
0.8 to 1.3
Iron (Fe), % 0 to 5.0
58.4 to 66.6
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 3.5 to 4.5
2.5 to 3.5
Nickel (Ni), % 19 to 21
5.5 to 7.0
Niobium (Nb), % 3.5 to 4.5
0
Nitrogen (N), % 0
0.12 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0