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R30816 Cobalt vs. EN 1.4558 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4558 stainless steel belongs to the iron alloys. They have 43% of their average alloy composition in common. 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 1.4558 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
39
Fatigue Strength, MPa 250
170
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
77
Tensile Strength: Ultimate (UTS), MPa 1020
510
Tensile Strength: Yield (Proof), MPa 460
200

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1540
1400
Melting Onset (Solidus), °C 1460
1350
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 13
12
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Density, g/cm3 9.1
8.0
Embodied Carbon, kg CO2/kg material 20
5.5
Embodied Energy, MJ/kg 320
77
Embodied Water, L/kg 440
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
160
Resilience: Unit (Modulus of Resilience), kJ/m3 510
100
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 31
18
Strength to Weight: Bending, points 25
18
Thermal Diffusivity, mm2/s 3.3
3.1
Thermal Shock Resistance, points 28
12

Alloy Composition

Aluminum (Al), % 0
0.15 to 0.45
Carbon (C), % 0.32 to 0.42
0 to 0.030
Chromium (Cr), % 19 to 21
20 to 23
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
39.2 to 47.9
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 19 to 21
32 to 35
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.7
Sulfur (S), % 0 to 0.030
0 to 0.015
Tantalum (Ta), % 3.5 to 4.5
0
Titanium (Ti), % 0
0 to 0.6
Tungsten (W), % 3.5 to 4.5
0