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R30003 Cobalt vs. EN 1.7767 Steel

R30003 cobalt belongs to the cobalt alloys classification, while EN 1.7767 steel belongs to the iron alloys. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30003 cobalt and the bottom bar is EN 1.7767 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 10 to 73
20
Fatigue Strength, MPa 320 to 560
320 to 340
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 83
74
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
670 to 690
Tensile Strength: Yield (Proof), MPa 510 to 1090
460 to 500

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Melting Completion (Liquidus), °C 1400
1470
Melting Onset (Solidus), °C 1440
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 95
4.5
Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.0
2.4
Embodied Energy, MJ/kg 110
33
Embodied Water, L/kg 400
64

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 600 to 2790
570 to 650
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32 to 57
24
Strength to Weight: Bending, points 26 to 38
22
Thermal Diffusivity, mm2/s 3.3
11
Thermal Shock Resistance, points 26 to 45
19 to 20

Alloy Composition

Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0.1 to 0.15
Chromium (Cr), % 19 to 21
2.8 to 3.3
Cobalt (Co), % 39 to 41
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 10 to 20.5
93.8 to 95.8
Manganese (Mn), % 1.5 to 2.5
0.3 to 0.6
Molybdenum (Mo), % 6.0 to 8.0
0.9 to 1.1
Nickel (Ni), % 14 to 16
0 to 0.25
Niobium (Nb), % 0
0 to 0.070
Nitrogen (N), % 0
0 to 0.012
Phosphorus (P), % 0 to 0.015
0 to 0.015
Silicon (Si), % 0 to 1.2
0 to 0.15
Sulfur (S), % 0 to 0.015
0 to 0.0050
Titanium (Ti), % 0
0 to 0.030
Vanadium (V), % 0
0.2 to 0.3