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R30816 Cobalt vs. SAE-AISI 5140 Steel

R30816 cobalt belongs to the cobalt alloys classification, while SAE-AISI 5140 steel belongs to the iron alloys. There are 26 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 R30816 cobalt and the bottom bar is SAE-AISI 5140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
170 to 290
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 23
12 to 29
Fatigue Strength, MPa 250
220 to 570
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 1020
560 to 970
Tensile Strength: Yield (Proof), MPa 460
290 to 840

Thermal Properties

Latent Heat of Fusion, J/g 300
250
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
45
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
1.4
Embodied Energy, MJ/kg 320
19
Embodied Water, L/kg 440
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
76 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 510
220 to 1880
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 31
20 to 34
Strength to Weight: Bending, points 25
19 to 28
Thermal Diffusivity, mm2/s 3.3
12
Thermal Shock Resistance, points 28
16 to 29

Alloy Composition

Carbon (C), % 0.32 to 0.42
0.38 to 0.43
Chromium (Cr), % 19 to 21
0.7 to 0.9
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
97.3 to 98.1
Manganese (Mn), % 1.0 to 2.0
0.7 to 0.9
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0