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Pyromet 718: A Super Alloy

In the world of metals, metals fall into categories. Two specific types are alloys and super alloys. Each has its benefits. Among the superalloys currently available for use is Pyromet 718.

What Is a Super Alloy?

Engineers and other interested parties also refer to a superalloy as a high-performance alloy. This refers to the capabilities of it to perform within environments characterized by very high temperatures. To achieve this, they must have high surface stability as well as a good to excellent resistance to corrosion and creep. Three specific major alloys that meet the superalloy criteria are:

1. Cobalt-base
2. Nickel-base
3. Iron-base

While ductile, superalloys are strengthened using one of various hardening techniques. This may be precipitation hardening, solid-solution hardening or work hardening.

What Is Pyromet 718?

This superalloy is a nickel base alloy, precipitation hardened. It exhibits the following characteristics:

  • High surface stability
  • Exceptionally high yield
  • Excellent tensile properties
  • Outstanding creep resistance
  • Permits annealing and hardening (without spontaneously doing so during the heating and cooling processes)
  • Superb weldability
  • Corrosion resistant from moderate to excellent for a variety of substances including Sulfuric Acid (Moderate), Sour Oil/Gas (Good) and Salt Spray (Excellent)
  • Good ductility

What makes these properties truly admirable is they remain steadfast at temperatures ranging up to 1300°F (704°C). Moreover, machinability and welding are possible using regular or standard technology e.g. gas-tungsten arc welding, shielded metal.

Applications of Pyromet 718

This alloy finds use in components for jet engines and high-speed, high temperature withstanding airframes. Applications include:

  • Bolts
  • Buckets
  • Fasteners
  • Gas turbines
  • Nuclear reactors
  • Rocket motors
  • Spacers
  • Tooling
  • Turbo pump seals
  • Wheels

Pyromet 718

Pyromet 718 is a very popular super alloy. Its characteristics are desirable for use in certain high-performance, high-temperature industries. Those who supply materials for the aerospace industry may draw upon its properties to ensure they meet the diverse specifications and standards demanded by the manufacturers.