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R30816 Cobalt vs. ASTM A372 Grade F Steel

R30816 cobalt belongs to the cobalt alloys classification, while ASTM A372 grade F 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 ASTM A372 grade F steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
200 to 280
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 23
20 to 22
Fatigue Strength, MPa 250
310 to 380
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 1020
650 to 910
Tensile Strength: Yield (Proof), MPa 460
430 to 550

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
44
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
1.5
Embodied Energy, MJ/kg 320
20
Embodied Water, L/kg 440
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
130 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 510
500 to 810
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 31
23 to 32
Strength to Weight: Bending, points 25
21 to 27
Thermal Diffusivity, mm2/s 3.3
12
Thermal Shock Resistance, points 28
19 to 27

Alloy Composition

Carbon (C), % 0.32 to 0.42
0.3 to 0.4
Chromium (Cr), % 19 to 21
0.8 to 1.2
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
96.8 to 97.9
Manganese (Mn), % 1.0 to 2.0
0.7 to 1.0
Molybdenum (Mo), % 3.5 to 4.5
0.15 to 0.25
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.010
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0