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R30605 Cobalt vs. EN 1.7729 Steel

R30605 cobalt belongs to the cobalt alloys classification, while EN 1.7729 steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30605 cobalt and the bottom bar is EN 1.7729 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
17
Fatigue Strength, MPa 260 to 590
500
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
910
Tensile Strength: Yield (Proof), MPa 470 to 1600
750

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Melting Completion (Liquidus), °C 1410
1470
Melting Onset (Solidus), °C 1330
1430
Specific Heat Capacity, J/kg-K 410
470
Thermal Conductivity, W/m-K 9.6
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 1.8
8.7

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.8
Embodied Carbon, kg CO2/kg material 9.8
3.3
Embodied Energy, MJ/kg 140
49
Embodied Water, L/kg 450
59

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 33 to 55
32
Strength to Weight: Bending, points 25 to 36
27
Thermal Diffusivity, mm2/s 2.5
11
Thermal Shock Resistance, points 31 to 52
27

Alloy Composition

Aluminum (Al), % 0
0.015 to 0.080
Arsenic (As), % 0
0 to 0.020
Boron (B), % 0
0.0010 to 0.010
Carbon (C), % 0.050 to 0.15
0.17 to 0.23
Chromium (Cr), % 19 to 21
0.9 to 1.2
Cobalt (Co), % 46.4 to 57
0
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 0 to 3.0
94.8 to 97
Manganese (Mn), % 1.0 to 2.0
0.35 to 0.75
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 9.0 to 11
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 0.4
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.015
Tin (Sn), % 0
0 to 0.020
Titanium (Ti), % 0
0.070 to 0.15
Tungsten (W), % 14 to 16
0
Vanadium (V), % 0
0.6 to 0.8