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R30001 Cobalt vs. EN 1.7725 Steel

R30001 cobalt belongs to the cobalt alloys classification, while EN 1.7725 steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30001 cobalt and the bottom bar is EN 1.7725 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
14
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 620
830 to 1000

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Melting Completion (Liquidus), °C 1530
1460
Melting Onset (Solidus), °C 1260
1420
Specific Heat Capacity, J/kg-K 430
470
Thermal Conductivity, W/m-K 15
39
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.6

Otherwise Unclassified Properties

Density, g/cm3 9.0
7.8
Embodied Carbon, kg CO2/kg material 8.9
1.8
Embodied Energy, MJ/kg 130
24
Embodied Water, L/kg 460
54

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 19
29 to 35
Strength to Weight: Bending, points 18
25 to 28
Thermal Diffusivity, mm2/s 3.7
11
Thermal Shock Resistance, points 19
24 to 29

Alloy Composition

Carbon (C), % 2.0 to 3.0
0.27 to 0.34
Chromium (Cr), % 28 to 32
1.3 to 1.7
Cobalt (Co), % 43 to 59
0
Iron (Fe), % 0 to 3.0
95.7 to 97.5
Manganese (Mn), % 0
0.6 to 1.0
Molybdenum (Mo), % 0 to 1.0
0.3 to 0.5
Nickel (Ni), % 0 to 3.0
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 2.0
0 to 0.6
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 11 to 13
0
Vanadium (V), % 0
0.050 to 0.15