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Grade C-6 Cast Titanium

Grade C-6 titanium is a titanium alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has the lowest embodied energy among cast titaniums. In addition, it has a fairly low ductility and a moderately low electrical conductivity.

The graph bars on the material properties cards below compare grade C-6 titanium to: cast titaniums (top), all titanium alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness

290

Elastic (Young's, Tensile) Modulus

100 GPa 15 x 106 psi

Elongation at Break

9.0 %

Fatigue Strength

460 MPa 67 x 103 psi

Poisson's Ratio

0.32

Rockwell C Hardness

32

Shear Modulus

39 GPa 5.7 x 106 psi

Tensile Strength: Ultimate (UTS)

890 MPa 130 x 103 psi

Tensile Strength: Yield (Proof)

830 MPa 120 x 103 psi

Thermal Properties

Latent Heat of Fusion

410 J/g

Maximum Temperature: Mechanical

310 °C 580 °F

Melting Completion (Liquidus)

1580 °C 2870 °F

Melting Onset (Solidus)

1530 °C 2780 °F

Specific Heat Capacity

550 J/kg-K 0.13 BTU/lb-°F

Thermal Conductivity

7.8 W/m-K 4.5 BTU/h-ft-°F

Thermal Expansion

9.8 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

36 % relative

Density

4.5 g/cm3 280 lb/ft3

Embodied Carbon

30 kg CO2/kg material

Embodied Energy

480 MJ/kg 210 x 103 BTU/lb

Embodied Water

190 L/kg 22 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

78 MJ/m3

Resilience: Unit (Modulus of Resilience)

3300 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

35 points

Strength to Weight: Axial

55 points

Strength to Weight: Bending

46 points

Thermal Diffusivity

3.2 mm2/s

Thermal Shock Resistance

63 points

Alloy Composition

Titanium (Ti) 89.7 to 94
Aluminum (Al) 4.0 to 6.0
Tin (Sn) 2.0 to 3.0
Iron (Fe) 0 to 0.5
Oxygen (O) 0 to 0.2
Carbon (C) 0 to 0.1
Nickel (Ni) 0 to 0.050
Hydrogen (H) 0 to 0.015
Residuals 0 to 0.4

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B367: Standard Specification for Titanium and Titanium Alloy Castings

Titanium and Titanium Alloys: Fundamentals and Applications, Christoph Leyens and Manfred Peters (editors), 2003

Titanium, 2nd ed., G. Lutjering and J. C. Williams, 2007