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R30816 Cobalt vs. ASTM B817 Type II

R30816 cobalt belongs to the cobalt alloys classification, while ASTM B817 type II belongs to the titanium alloys. There are 24 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is ASTM B817 type II.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
100
Elongation at Break, % 23
3.0 to 13
Fatigue Strength, MPa 250
390 to 530
Poisson's Ratio 0.3
0.32
Reduction in Area, % 22
4.0 to 13
Shear Modulus, GPa 81
40
Tensile Strength: Ultimate (UTS), MPa 1020
900 to 960
Tensile Strength: Yield (Proof), MPa 460
780 to 900

Thermal Properties

Latent Heat of Fusion, J/g 300
400
Melting Completion (Liquidus), °C 1540
1580
Melting Onset (Solidus), °C 1460
1530
Specific Heat Capacity, J/kg-K 420
550
Thermal Expansion, µm/m-K 12
9.9

Otherwise Unclassified Properties

Density, g/cm3 9.1
4.6
Embodied Carbon, kg CO2/kg material 20
40
Embodied Energy, MJ/kg 320
650
Embodied Water, L/kg 440
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
26 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 510
2890 to 3890
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
34
Strength to Weight: Axial, points 31
55 to 58
Strength to Weight: Bending, points 25
45 to 47
Thermal Shock Resistance, points 28
62 to 66

Alloy Composition

Aluminum (Al), % 0
5.0 to 6.0
Carbon (C), % 0.32 to 0.42
0 to 0.1
Chlorine (Cl), % 0
0 to 0.2
Chromium (Cr), % 19 to 21
0
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
0.35 to 1.0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 5.0
0.35 to 1.0
Manganese (Mn), % 1.0 to 2.0
0
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 3.5 to 4.5
0
Nitrogen (N), % 0
0 to 0.040
Oxygen (O), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.1
Sodium (Na), % 0
0 to 0.2
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 3.5 to 4.5
0
Tin (Sn), % 0
1.5 to 2.5
Titanium (Ti), % 0
82.1 to 87.8
Tungsten (W), % 3.5 to 4.5
0
Vanadium (V), % 0
5.0 to 6.0
Residuals, % 0
0 to 0.4