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ASTM B817 Type II vs. R30605 Cobalt

ASTM B817 type II belongs to the titanium alloys classification, while R30605 cobalt belongs to the cobalt alloys. There are 21 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is ASTM B817 type II and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
210
Elongation at Break, % 3.0 to 13
34
Fatigue Strength, MPa 390 to 530
260 to 590
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 40
81
Tensile Strength: Ultimate (UTS), MPa 900 to 960
1130 to 1900
Tensile Strength: Yield (Proof), MPa 780 to 900
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Melting Completion (Liquidus), °C 1580
1410
Melting Onset (Solidus), °C 1530
1330
Specific Heat Capacity, J/kg-K 550
410
Thermal Expansion, µm/m-K 9.9
12

Otherwise Unclassified Properties

Density, g/cm3 4.6
9.6
Embodied Carbon, kg CO2/kg material 40
9.8
Embodied Energy, MJ/kg 650
140
Embodied Water, L/kg 220
450

Common Calculations

Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 34
21
Strength to Weight: Axial, points 55 to 58
33 to 55
Strength to Weight: Bending, points 45 to 47
25 to 36
Thermal Shock Resistance, points 62 to 66
31 to 52

Alloy Composition


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Aluminum (Al), % 5.0 to 6.0
0
Carbon (C), % 0 to 0.1
0.050 to 0.15
Chlorine (Cl), % 0 to 0.2
0
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
46.4 to 57
Copper (Cu), % 0.35 to 1.0
0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0.35 to 1.0
0 to 3.0
Manganese (Mn), % 0
1.0 to 2.0
Nickel (Ni), % 0
9.0 to 11
Nitrogen (N), % 0 to 0.040
0
Oxygen (O), % 0 to 0.3
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.1
0 to 0.4
Sodium (Na), % 0 to 0.2
0
Sulfur (S), % 0
0 to 0.030
Tin (Sn), % 1.5 to 2.5
0
Titanium (Ti), % 82.1 to 87.8
0
Tungsten (W), % 0
14 to 16
Vanadium (V), % 5.0 to 6.0
0
Residuals, % 0 to 0.4
0