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R30605 Cobalt vs. EN 1.4971 Stainless Steel

R30605 cobalt belongs to the cobalt alloys classification, while EN 1.4971 stainless steel belongs to the iron alloys. They have 55% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30605 cobalt and the bottom bar is EN 1.4971 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
210
Elongation at Break, % 34
34
Fatigue Strength, MPa 260 to 590
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
81
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
800
Tensile Strength: Yield (Proof), MPa 470 to 1600
340

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Melting Completion (Liquidus), °C 1410
1460
Melting Onset (Solidus), °C 1330
1410
Specific Heat Capacity, J/kg-K 410
450
Thermal Conductivity, W/m-K 9.6
13
Thermal Expansion, µm/m-K 12
15

Otherwise Unclassified Properties

Density, g/cm3 9.6
8.4
Embodied Carbon, kg CO2/kg material 9.8
7.6
Embodied Energy, MJ/kg 140
110
Embodied Water, L/kg 450
300

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 33 to 55
26
Strength to Weight: Bending, points 25 to 36
23
Thermal Diffusivity, mm2/s 2.5
3.4
Thermal Shock Resistance, points 31 to 52
19

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.080 to 0.16
Chromium (Cr), % 19 to 21
20 to 22.5
Cobalt (Co), % 46.4 to 57
18.5 to 21
Iron (Fe), % 0 to 3.0
24.3 to 37.1
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 9.0 to 11
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 14 to 16
2.0 to 3.0