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R30816 Cobalt vs. SAE-AISI P4 Steel

R30816 cobalt belongs to the cobalt alloys classification, while SAE-AISI P4 steel belongs to the iron alloys. There are 20 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 R30816 cobalt and the bottom bar is SAE-AISI P4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 81
74
Tensile Strength: Ultimate (UTS), MPa 1020
390 to 1980

Thermal Properties

Latent Heat of Fusion, J/g 300
260
Melting Completion (Liquidus), °C 1540
1460
Melting Onset (Solidus), °C 1460
1420
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 13
41
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
1.8
Embodied Energy, MJ/kg 320
23
Embodied Water, L/kg 440
68

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 31
14 to 70
Strength to Weight: Bending, points 25
15 to 45
Thermal Diffusivity, mm2/s 3.3
11
Thermal Shock Resistance, points 28
13 to 64

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.12
Chromium (Cr), % 19 to 21
4.0 to 5.3
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 5.0
92.3 to 95.3
Manganese (Mn), % 1.0 to 2.0
0.2 to 0.6
Molybdenum (Mo), % 3.5 to 4.5
0.4 to 1.0
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0.1 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0