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R30816 Cobalt vs. EN 1.4518 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4518 stainless steel belongs to the iron alloys. They have a modest 37% 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 1.4518 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
34
Fatigue Strength, MPa 250
160
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
79
Tensile Strength: Ultimate (UTS), MPa 1020
490
Tensile Strength: Yield (Proof), MPa 460
210

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1540
1450
Melting Onset (Solidus), °C 1460
1400
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.9
Embodied Carbon, kg CO2/kg material 20
4.0
Embodied Energy, MJ/kg 320
55
Embodied Water, L/kg 440
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
140
Resilience: Unit (Modulus of Resilience), kJ/m3 510
100
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
17
Strength to Weight: Bending, points 25
18
Thermal Diffusivity, mm2/s 3.3
4.1
Thermal Shock Resistance, points 28
14

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.030
Chromium (Cr), % 19 to 21
18 to 20
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
61.4 to 70
Manganese (Mn), % 1.0 to 2.0
0 to 1.5
Molybdenum (Mo), % 3.5 to 4.5
3.0 to 3.5
Nickel (Ni), % 19 to 21
9.0 to 12
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0