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R30021 Cobalt vs. EN 1.7711 Steel

R30021 cobalt belongs to the cobalt alloys classification, while EN 1.7711 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is EN 1.7711 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
16 to 22
Fatigue Strength, MPa 250
290 to 520
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 700
690 to 930
Tensile Strength: Yield (Proof), MPa 500
400 to 800

Thermal Properties

Latent Heat of Fusion, J/g 330
250
Melting Completion (Liquidus), °C 1350
1460
Melting Onset (Solidus), °C 1190
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
33
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
2.3
Embodied Energy, MJ/kg 110
32
Embodied Water, L/kg 520
54

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
130 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 570
430 to 1690
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
24 to 33
Strength to Weight: Bending, points 21
22 to 27
Thermal Diffusivity, mm2/s 3.8
8.9
Thermal Shock Resistance, points 21
24 to 32

Alloy Composition

Aluminum (Al), % 0
0 to 0.015
Carbon (C), % 0.2 to 0.35
0.36 to 0.44
Chromium (Cr), % 26 to 29
0.9 to 1.2
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
96 to 97.5
Manganese (Mn), % 0
0.45 to 0.85
Molybdenum (Mo), % 4.5 to 6.0
0.5 to 0.65
Nickel (Ni), % 2.0 to 3.0
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 1.5
0 to 0.4
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0.25 to 0.35