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R30816 Cobalt vs. EN 1.4935 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4935 stainless steel belongs to the iron alloys. 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 1.4935 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
16 to 18
Fatigue Strength, MPa 250
350 to 400
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
76
Tensile Strength: Ultimate (UTS), MPa 1020
780 to 880
Tensile Strength: Yield (Proof), MPa 460
570 to 670

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Melting Completion (Liquidus), °C 1540
1460
Melting Onset (Solidus), °C 1460
1420
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 13
24
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
2.9
Embodied Energy, MJ/kg 320
42
Embodied Water, L/kg 440
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
130
Resilience: Unit (Modulus of Resilience), kJ/m3 510
830 to 1160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
28 to 31
Strength to Weight: Bending, points 25
24 to 26
Thermal Diffusivity, mm2/s 3.3
6.5
Thermal Shock Resistance, points 28
27 to 30

Alloy Composition

Carbon (C), % 0.32 to 0.42
0.17 to 0.24
Chromium (Cr), % 19 to 21
11 to 12.5
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
83 to 86.7
Manganese (Mn), % 1.0 to 2.0
0.3 to 0.8
Molybdenum (Mo), % 3.5 to 4.5
0.8 to 1.2
Nickel (Ni), % 19 to 21
0.3 to 0.8
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0.1 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.015
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0.4 to 0.6
Vanadium (V), % 0
0.2 to 0.35