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ASTM B817 Type II vs. R30075 Cobalt

ASTM B817 type II belongs to the titanium alloys classification, while R30075 cobalt belongs to the cobalt alloys. There are 24 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 ASTM B817 type II and the bottom bar is R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
210 to 250
Elongation at Break, % 3.0 to 13
12
Fatigue Strength, MPa 390 to 530
250 to 840
Poisson's Ratio 0.32
0.29
Reduction in Area, % 4.0 to 13
20
Shear Modulus, GPa 40
82 to 98
Tensile Strength: Ultimate (UTS), MPa 900 to 960
780 to 1280
Tensile Strength: Yield (Proof), MPa 780 to 900
480 to 840

Thermal Properties

Latent Heat of Fusion, J/g 400
320
Melting Completion (Liquidus), °C 1580
1360
Melting Onset (Solidus), °C 1530
1290
Specific Heat Capacity, J/kg-K 550
450
Thermal Expansion, µm/m-K 9.9
12

Otherwise Unclassified Properties

Density, g/cm3 4.6
8.4
Embodied Carbon, kg CO2/kg material 40
8.1
Embodied Energy, MJ/kg 650
110
Embodied Water, L/kg 220
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 26 to 120
84 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 2890 to 3890
560 to 1410
Stiffness to Weight: Axial, points 13
14 to 17
Stiffness to Weight: Bending, points 34
24 to 25
Strength to Weight: Axial, points 55 to 58
26 to 42
Strength to Weight: Bending, points 45 to 47
22 to 31
Thermal Shock Resistance, points 62 to 66
21 to 29

Alloy Composition

Aluminum (Al), % 5.0 to 6.0
0 to 0.1
Boron (B), % 0
0 to 0.010
Carbon (C), % 0 to 0.1
0 to 0.35
Chlorine (Cl), % 0 to 0.2
0
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 0
58.7 to 68
Copper (Cu), % 0.35 to 1.0
0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0.35 to 1.0
0 to 0.75
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 0.5
Nitrogen (N), % 0 to 0.040
0 to 0.25
Oxygen (O), % 0 to 0.3
0
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.1
0 to 1.0
Sodium (Na), % 0 to 0.2
0
Sulfur (S), % 0
0 to 0.010
Tin (Sn), % 1.5 to 2.5
0
Titanium (Ti), % 82.1 to 87.8
0 to 0.1
Tungsten (W), % 0
0 to 0.2
Vanadium (V), % 5.0 to 6.0
0
Residuals, % 0 to 0.4
0