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Grade 21 Titanium vs. R30003 Cobalt

Grade 21 titanium belongs to the titanium alloys classification, while R30003 cobalt belongs to the cobalt alloys. There are 25 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 grade 21 titanium and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
210
Elongation at Break, % 9.0 to 17
10 to 73
Fatigue Strength, MPa 550 to 660
320 to 560
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 51
83
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
970 to 1720
Tensile Strength: Yield (Proof), MPa 870 to 1170
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 410
310
Melting Completion (Liquidus), °C 1740
1400
Melting Onset (Solidus), °C 1690
1440
Specific Heat Capacity, J/kg-K 500
450
Thermal Conductivity, W/m-K 7.5
13
Thermal Expansion, µm/m-K 7.1
13

Otherwise Unclassified Properties

Base Metal Price, % relative 60
95
Density, g/cm3 5.4
8.4
Embodied Carbon, kg CO2/kg material 32
8.0
Embodied Energy, MJ/kg 490
110
Embodied Water, L/kg 180
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
600 to 2790
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 32
24
Strength to Weight: Axial, points 46 to 69
32 to 57
Strength to Weight: Bending, points 38 to 50
26 to 38
Thermal Diffusivity, mm2/s 2.8
3.3
Thermal Shock Resistance, points 66 to 100
26 to 45

Alloy Composition


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Aluminum (Al), % 2.5 to 3.5
0
Boron (B), % 0
0 to 0.1
Carbon (C), % 0 to 0.050
0 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
39 to 41
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
10 to 20.5
Manganese (Mn), % 0
1.5 to 2.5
Molybdenum (Mo), % 14 to 16
6.0 to 8.0
Nickel (Ni), % 0
14 to 16
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.17
0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0.15 to 0.25
0 to 1.2
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 76 to 81.2
0
Residuals, % 0 to 0.4
0

Comparable Variants