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R30816 Cobalt vs. SAE-AISI 4028 Steel

R30816 cobalt belongs to the cobalt alloys classification, while SAE-AISI 4028 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 4028 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
150 to 190
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 23
14 to 23
Fatigue Strength, MPa 250
180 to 330
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 1020
490 to 630
Tensile Strength: Yield (Proof), MPa 460
260 to 520

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
49
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
1.5
Embodied Energy, MJ/kg 320
19
Embodied Water, L/kg 440
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
81 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 510
180 to 720
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 31
17 to 22
Strength to Weight: Bending, points 25
18 to 21
Thermal Diffusivity, mm2/s 3.3
13
Thermal Shock Resistance, points 28
16 to 20

Alloy Composition

Carbon (C), % 0.32 to 0.42
0.25 to 0.3
Chromium (Cr), % 19 to 21
0
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
98.1 to 98.7
Manganese (Mn), % 1.0 to 2.0
0.7 to 0.9
Molybdenum (Mo), % 3.5 to 4.5
0.2 to 0.3
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
0.035 to 0.050
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0