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Grade 18 Titanium vs. Grade 30 Titanium

Both grade 18 titanium and grade 30 titanium are titanium alloys. They have a moderately high 95% of their average alloy composition in common.

For each property being compared, the top bar is grade 18 titanium and the bottom bar is grade 30 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 11 to 17
23
Fatigue Strength, MPa 330 to 480
250
Poisson's Ratio 0.32
0.32
Reduction in Area, % 23
34
Shear Modulus, GPa 40
41
Shear Strength, MPa 420 to 590
240
Tensile Strength: Ultimate (UTS), MPa 690 to 980
390
Tensile Strength: Yield (Proof), MPa 540 to 810
350

Thermal Properties

Latent Heat of Fusion, J/g 410
420
Maximum Temperature: Mechanical, °C 330
320
Melting Completion (Liquidus), °C 1640
1660
Melting Onset (Solidus), °C 1590
1610
Specific Heat Capacity, J/kg-K 550
540
Thermal Conductivity, W/m-K 8.3
21
Thermal Expansion, µm/m-K 9.9
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.3
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
6.9

Otherwise Unclassified Properties

Density, g/cm3 4.5
4.5
Embodied Carbon, kg CO2/kg material 41
36
Embodied Energy, MJ/kg 670
600
Embodied Water, L/kg 270
230

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 110
86
Resilience: Unit (Modulus of Resilience), kJ/m3 1380 to 3110
590
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 43 to 61
24
Strength to Weight: Bending, points 39 to 49
26
Thermal Diffusivity, mm2/s 3.4
8.6
Thermal Shock Resistance, points 47 to 67
30

Alloy Composition


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Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.080
0 to 0.080
Cobalt (Co), % 0
0.2 to 0.8
Hydrogen (H), % 0 to 0.015
0 to 0.015
Iron (Fe), % 0 to 0.25
0 to 0.3
Nitrogen (N), % 0 to 0.030
0 to 0.030
Oxygen (O), % 0 to 0.15
0 to 0.25
Palladium (Pd), % 0.040 to 0.080
0.040 to 0.080
Titanium (Ti), % 92.5 to 95.5
98 to 99.76
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0 to 0.4