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R30075 Cobalt vs. EN 1.6554 Steel

R30075 cobalt belongs to the cobalt alloys classification, while EN 1.6554 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is EN 1.6554 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
190
Elongation at Break, % 12
17 to 21
Fatigue Strength, MPa 250 to 840
380 to 520
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 82 to 98
73
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
780 to 930
Tensile Strength: Yield (Proof), MPa 480 to 840
550 to 790

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
40
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.7

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.1
1.7
Embodied Energy, MJ/kg 110
22
Embodied Water, L/kg 530
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
140 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
810 to 1650
Stiffness to Weight: Axial, points 14 to 17
13
Stiffness to Weight: Bending, points 24 to 25
24
Strength to Weight: Axial, points 26 to 42
27 to 33
Strength to Weight: Bending, points 22 to 31
24 to 27
Thermal Diffusivity, mm2/s 3.5
11
Thermal Shock Resistance, points 21 to 29
23 to 27

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0.23 to 0.28
Chromium (Cr), % 27 to 30
0.7 to 0.9
Cobalt (Co), % 58.7 to 68
0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 0 to 0.75
94.6 to 97.3
Manganese (Mn), % 0 to 1.0
0.6 to 0.9
Molybdenum (Mo), % 5.0 to 7.0
0.2 to 0.3
Nickel (Ni), % 0 to 0.5
1.0 to 2.0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.6
Sulfur (S), % 0 to 0.010
0 to 0.025
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0
Vanadium (V), % 0
0 to 0.030

Comparable Variants