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R30816 Cobalt vs. ASTM A387 Grade 22 Steel

R30816 cobalt belongs to the cobalt alloys classification, while ASTM A387 grade 22 steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is ASTM A387 grade 22 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 23
21
Fatigue Strength, MPa 250
160 to 240
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 81
74
Tensile Strength: Ultimate (UTS), MPa 1020
480 to 600
Tensile Strength: Yield (Proof), MPa 460
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 300
260
Melting Completion (Liquidus), °C 1540
1470
Melting Onset (Solidus), °C 1460
1430
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 13
40
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.9
Embodied Carbon, kg CO2/kg material 20
1.7
Embodied Energy, MJ/kg 320
23
Embodied Water, L/kg 440
58

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
85 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 510
140 to 320
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 31
17 to 21
Strength to Weight: Bending, points 25
17 to 20
Thermal Diffusivity, mm2/s 3.3
11
Thermal Shock Resistance, points 28
14 to 17

Alloy Composition

Carbon (C), % 0.32 to 0.42
0.050 to 0.15
Chromium (Cr), % 19 to 21
2.0 to 2.5
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
95.1 to 96.8
Manganese (Mn), % 1.0 to 2.0
0.3 to 0.6
Molybdenum (Mo), % 3.5 to 4.5
0.9 to 1.1
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0