HAYNES® 25

HAYNES® 25

HAYNES® 25 is a Co-Ni-Cr-W (cobalt-nickel-chromium-tungsten) alloy that combines excellent high-temperature strength with good resistance to oxidizing environments up to 1800°F (980°C) for prolonged exposures, and excellent resistance to sulfidation. It can be fabricated and formed by conventional techniques, and has been used for cast components. Other attractive features include excellent resistance to metal galling.

Applications

HAYNES® 25 alloy combines properties which make it suitable for a number of component applications in the aerospace industry, including parts in established military and commercial gas turbine engines. In modern engines, it has largely been replaced by newer materials such as HAYNES® 188, and, most recently, HAYNES® 230, which possess improved properties. Another area of significant usage for alloy 25 is as a bearing material, for both balls and races.

It is particularly effective for very long-term applications at temperatures of 1200 to 1800°F (650 to 980°C). It is stronger than nickel-base solid-solution strengthened alloys, and is the strongest of the cobalt-base materials which still have good fabrication characteristics.

HAYNES® 25 is readily welded by Gas Tungsten Arc (GTAW), Gas Metal Arc (GMAW), Shielded Metal Arc (coated electrodes), electron beam welding and resistance welding techniques. Its welding characteristics are similar to those for HAYNES 188. Submerged Arc welding is not recommended as this process is characterized by high heat input to the base metal and slow cooling of the weld. These factors can increase weld restraint and promote cracking.

Specifications:

• AMS 5796
• UNS R30605

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