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R30003 Cobalt vs. EN 1.7725 Steel

R30003 cobalt belongs to the cobalt alloys classification, while EN 1.7725 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 R30003 cobalt and the bottom bar is EN 1.7725 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 10 to 73
14
Fatigue Strength, MPa 320 to 560
390 to 550
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 83
73
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
830 to 1000
Tensile Strength: Yield (Proof), MPa 510 to 1090
610 to 860

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1440
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 95
2.9
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
1.8
Embodied Energy, MJ/kg 110
24
Embodied Water, L/kg 400
54

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 600 to 2790
980 to 1940
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32 to 57
29 to 35
Strength to Weight: Bending, points 26 to 38
25 to 28
Thermal Diffusivity, mm2/s 3.3
11
Thermal Shock Resistance, points 26 to 45
24 to 29

Alloy Composition

Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0.27 to 0.34
Chromium (Cr), % 19 to 21
1.3 to 1.7
Cobalt (Co), % 39 to 41
0
Iron (Fe), % 10 to 20.5
95.7 to 97.5
Manganese (Mn), % 1.5 to 2.5
0.6 to 1.0
Molybdenum (Mo), % 6.0 to 8.0
0.3 to 0.5
Nickel (Ni), % 14 to 16
0
Phosphorus (P), % 0 to 0.015
0 to 0.025
Silicon (Si), % 0 to 1.2
0 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.030
Vanadium (V), % 0
0.050 to 0.15

Comparable Variants