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R30605 Cobalt vs. SAE-AISI 5155 Steel

R30605 cobalt belongs to the cobalt alloys classification, while SAE-AISI 5155 steel belongs to the iron alloys. There are 25 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 R30605 cobalt and the bottom bar is SAE-AISI 5155 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
21
Fatigue Strength, MPa 260 to 590
260
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
620
Tensile Strength: Yield (Proof), MPa 470 to 1600
380

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Melting Completion (Liquidus), °C 1410
1450
Melting Onset (Solidus), °C 1330
1410
Specific Heat Capacity, J/kg-K 410
470
Thermal Conductivity, W/m-K 9.6
49
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.3

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.8
Embodied Carbon, kg CO2/kg material 9.8
1.4
Embodied Energy, MJ/kg 140
19
Embodied Water, L/kg 450
49

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 33 to 55
22
Strength to Weight: Bending, points 25 to 36
21
Thermal Diffusivity, mm2/s 2.5
13
Thermal Shock Resistance, points 31 to 52
20

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.51 to 0.59
Chromium (Cr), % 19 to 21
0.7 to 0.9
Cobalt (Co), % 46.4 to 57
0
Iron (Fe), % 0 to 3.0
97.2 to 97.9
Manganese (Mn), % 1.0 to 2.0
0.7 to 0.9
Nickel (Ni), % 9.0 to 11
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 14 to 16
0