Refractory Alloys Columbium - Hafnium - Titanium Alloy

Not applicable.

Anneal at 2000 to 2400 F. A stress relief anneal may be done at 1600 F for one hour.

Used for rocket structures and heat radiation shields on aerospace and gas turbine applications for temperatures up to 2500 F.

The alloy has good ductility in the annealed condition and may be cold formed by conventional means.

This alloy will form a protective oxide in most acids. This oxide will protect it from corrosion. However it is attacked by hydrofluoric acid or by alkaline solutions.

The alloy can be forged at 2200 F down to 1700 F.

Forming may be accomplished with the alloy in the annealed condition. It can be formed by bending, punching or stamping much the same as for plain carbon steel.

Hardens by cold working.

Not heat treatable for hardness. See "Annealing".

Hot forming, such as extrusion, may be done at 2200 to 1800 F. Hot rolling, or similar forming, may be done at 800 F.

All of the refractory alloys are difficult to machine. Equipment must be powerful and rigid to prevent tool chatter. The columbium (niobium) alloys such as this one are more readily machined than other refractory alloys. For machining columbium alloy h

For use at elevated temperatures in air a protective silicide or aluminide coating should be applied to the parts made from this alloy.

This alloy of columbium (or niobium)m and hafnium has a commercial tradename designation of C-103. It is one of the columbium base refractory alloys. Also called KBI-3.

Not applicable.

This alloy can be welded by electron beam, resistance welding or gas tungsten-arc welding methods (GTAW). There is some loss of ductility in the weld.