Super Alloy A-286

Principal Design Features

An iron based high temperature, high strength alloy.

Applications

Used for reasonably low cost when moderate strength and oxidation resistance are required at temperatures greater than suitable for stainless steels. This alloy finds application in gas turbine forgings. It is suited for use up to a temperature of about 1300 F in corrosive environment (such as gas turbines) and to 1500 F for continuous service in oxidizing environments.

Machinability

Readily machined by standard methods. Similar in behavior to the machining of the austenitic (300 series) stainless steels. Cemented carbide tools are best for high cutting rates as in turning operations. Turning: Surface speed of 300-325 fpm using carbide tooling at feed rate of 0.008 inches per revolution. Use water base coolant or lubricant. Drilling: High speed steel drills with a positive rake work well. Feed rates are 0.001″ to 0.006″ per revolution, with the smaller feed rate the smaller the hole diameter being drilled. Surface speed range 25-35 feet per minute. Milling: Rigid machines and fixtures are essential for a good milled finish. Cutting speeds of 30-40 surface feet per minute with a feed rate of 0.003″ to 0.005″ per mill cutter tooth should be used.

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