Newsletter | Vol 12 - September 2020

Legacy Alloys: Nickel/Cobalt-Based Alloys

The CINDAS AHAD database includes over 300 alloys. Many of these alloys were developed more than 50 years ago, but they are still widely used and popular in applications throughout different industries. This article will feature the Top 10 ?legacy? alloys in the nickel/cobalt category that CINDAS customers refer to and access through the AHAD database. Future newsletters will highlight legacy alloys from other material classes (aluminum, stainless steel, titanium and high strength steels).

Inconel 718 is the most widely used superalloy. It is recognized for its excellent strength, ductility and toughness throughout the temperature range -423F to 1300F. Ideal for its processing versatility, it is used in structural applications for aerospace, nuclear and petrochemical industries. It is available in cast and wrought forms.

Inconel 625
Inconel 625 is a nickel-based superalloy with good strength, creep and fatigue properties from cryogenic to elevated temperatures. It is used widely in the chemical, nuclear and aerospace industries.

A-286 is a high toughness austenitic stainless steel (25% Ni, 15% Cr). It is used in temperature ranges up to 1300F. Applications include aircraft turbine engine components such as disks, vanes, blades, shafts and combustors.

Hastelloy X
Hastelloy X is a nickel-based superalloy with oxidation resistance up to 2200F and moderate strength up to 1600F. It is used in the aerospace combustion and turbine sectors, as well as in the industrial, chemical and petrochemical industries.

Inconel 600
Inconel 600 is a nickel chromium alloy widely used because of its excellent corrosion and oxidation resistance. It has corrosion resistance in many organic and inorganic environments. Applications are found in the aerospace, chemical, heat treating equipment and nuclear industries.

Haynes 188
Haynes 188 is the most widely used cobalt-based alloy in the aircraft engine market. It has excellent strength, weldability and oxidation resistance. It has a 100F higher creep resistance strength advantage over Hastelloy X.

Waspaloy has good tensile strength and fatigue at intermediate temperature ranges. It is used for disks in turbine and compressor sections of turbine engines.

Haynes 230
Haynes 230 has excellent resistance to oxidizing environments up to 2100F. The alloy retains high ductility and toughness following long exposures in the 1200-1600F range. Primary applications include combustors, transition ducts and temperature sensors in gas turbine engines and nozzles for rocket engines.

X-750 can be used up to 1300F and has excellent sub-zero properties. Applications include aerospace rotor blades, wheels and bolts in gas turbine engines. It is also used in thrust reversers, springs and fasteners.

IN-100 is widely used as a compressor and gas turbine disk material for jet engines. This alloy has a good balance of strength, creep resistance and fatigue crack growth properties.