13.5V -11CR-3AL

Principal Design Features

This is a heat treatable, beta alloy titanium generally considered for high strength applications. It combines good fabricability with excellent corrosion resistance and mechanical properties. It is not generally available at the distributor level, but is widely available from producers in sheet, strip, plate, forgings and wire. Beta Transus (F +/- 25) 1325.

Applications

High strength airframe components including wire springs.

Machinability

As a family, titanium and its alloys have developed a mystique as a nightmare to machine. This is simply not the case. Experienced operators have compared its characteristics to those found in 316 stainless steel. Recommended practice includes high coolant flow(to offset the material’s low thermal conductivity), slow speeds and relatively high feed rates. Tooling should be tungsten carbide designations C1-C4 or cobalt type high speed tools.

Forming

This alloy can be hot or cold formed and will exhibit characteristics equivalent to those found in a 1/8 to 1/4 hard austenitic stainless steel.

Welding

Rated as “good” in terms of weldability.

Forging

Recommended forging temperatures are between 1950 and 2150 F.

Hot Working

Hot forming will reduce both the springback and required forming forces, and will increase the overall ductility of the material.

Cold Working

The cold working characteristics of this alloy are similar to those found in austenitic stainless steels. In multiple forming operations, intermediate stress relieving is recommended to offset the alloy’s tendency to work harden. Post-work annealing is re

Annealing

Full annealing can be obtained by heating to 1450 F for 15 minutes, followed by air cooling. For STA condition, hold at 900 F for 4 hours and air cool.