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ASTM B817 Type I vs. R30008 Cobalt

ASTM B817 type I belongs to the titanium alloys classification, while R30008 cobalt belongs to the cobalt alloys. There are 23 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 ASTM B817 type I and the bottom bar is R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
210
Elongation at Break, % 4.0 to 13
1.1 to 73
Fatigue Strength, MPa 360 to 520
320 to 530
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 40
83
Tensile Strength: Ultimate (UTS), MPa 770 to 960
950 to 1700
Tensile Strength: Yield (Proof), MPa 700 to 860
500 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 410
320
Melting Completion (Liquidus), °C 1600
1400
Melting Onset (Solidus), °C 1550
1330
Specific Heat Capacity, J/kg-K 560
450
Thermal Expansion, µm/m-K 9.6
13

Otherwise Unclassified Properties

Base Metal Price, % relative 36
95
Density, g/cm3 4.4
8.4
Embodied Carbon, kg CO2/kg material 38
8.1
Embodied Energy, MJ/kg 610
110
Embodied Water, L/kg 200
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 2310 to 3540
590 to 2720
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 48 to 60
31 to 56
Strength to Weight: Bending, points 42 to 49
25 to 37
Thermal Shock Resistance, points 54 to 68
25 to 44

Alloy Composition

Aluminum (Al), % 5.5 to 6.8
0
Boron (B), % 0
0 to 0.0010
Carbon (C), % 0 to 0.1
0 to 0.15
Chlorine (Cl), % 0 to 0.2
0
Chromium (Cr), % 0
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
7.6 to 20
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
6.5 to 7.5
Nickel (Ni), % 0
15 to 18
Nitrogen (N), % 0 to 0.040
0
Oxygen (O), % 0 to 0.3
0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.1
0 to 1.2
Sodium (Na), % 0 to 0.2
0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 87 to 91
0
Vanadium (V), % 3.5 to 4.5
0
Residuals, % 0 to 0.4
0