6AL-2SN – 4ZR-6MO

Principal Design Features

This is a heat treatable, alpha-beta alloy which was designed primarily for high temperature applications requiring higher strength than alloy 6-2-4-2 at similar temperatures. It combines good corrosion resistance and strength with weldability and fabricability. The alloy is generally available at the mill level in bar and billet form.

Applications

Generally selected over 6-2-4-2 for applications requiring strength at temperatures up to 454 C(850 F). Found in gas turbine discs and impellers and has been evaluated for use in deep sour well applications.

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” limited” in terms of weldability.

Heat Treatment

Solution treat at 843-913 C(1550-1675 F), air, oil or water quench.

Forging

Work at 843-927 C(1565-1725 F) from bar and billet.

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

Triplex-Beta minus 14 C(25 F), 1-2 hours, air cool, plus 801-857 C(1490-1595 F), 1-4 hours, air cool plus 593 C(1100 F) 4-8 hours, air cool. For stress relief, heat to 482-649 C(900-1200 F), hold for 1-4 hours and air cool.

Aging

Hold at 579-607 C(1075-1125 F) for 8 hours and air cool.

Other Physical Properties

Beta Transus (F+/- 25) 1710

Density: 0.169

Specific Gravity: 4.65

Melting Point: 1635

Thermal Conductivity: 4.1

MoETensile: 16

 

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