High-Temperature Alloys

High-Temperature Alloys 

High-temperature alloys are materials engineered to withstand elevated temperatures while maintaining their mechanical properties, resistance to oxidation and corrosion, and structural integrity. These alloys are used in extreme environments where materials are subjected to thermal stresses, such as gas turbines, jet engines, and industrial furnaces.
The primary categories of high-temperature alloys include superalloys, heat-resistant steels, and refractory metals. These materials are specifically designed for applications in industries like aerospace, power generation, automotive, chemical processing, and more.

Key Characteristics of High-Temperature Alloys

Thermal Stability

Maintain strength and dimensional stability at elevated temperatures.

Oxidation Resistance

Resist degradation due to high-temperature exposure to oxygen.

Creep Resistance

Resist deformation under mechanical stress at high temperatures.

Corrosion Resistance

Resist degradation in aggressive chemical environments, such as those found in high-temperature combustion gases or chemical reactors.

High Strength

Retain mechanical strength in the face of high thermal and mechanical stresses.

Common High-Temperature Alloys and Their Applications

AlloyCompositionPropertiesApplications
Inconel 60072% Nickel, 14-17% Chromium, 6-10% IronExcellent oxidation resistance, good weldabilityHeat exchangers, furnace components, nuclear reactors
Inconel 62558% Nickel, 20-23% Chromium, 8-10% MoHigh strength, fatigue resistance, corrosion resistanceAerospace, marine, chemical processing
Inconel 71850-55% Nickel, 19-21% Chromium, 3-5% MoHigh temperature strength, resistance to creepJet engines, turbine blades, rocket engines
Rene 4150-60% Nickel, 14-16% Chromium, 3-4% MoExcellent high-temperature strength and oxidation resistanceAerospace turbine components, gas turbines
Titanium Ti-6Al-4V90% Titanium, 6% Aluminum, 4% VanadiumHigh strength-to-weight ratio, good oxidation resistanceAerospace, military, marine, medical implants
Tungsten99% TungstenExtremely high melting point (3,422°C), excellent strengthAerospace, rocket nozzles, cutting tools
Molybdenum99% MolybdenumHigh melting point (2,623°C), good strength and oxidation resistanceAerospace, electronics, steelmaking
Tantalum99% TantalumExcellent corrosion resistance, high melting pointAerospace, nuclear reactors, chemical processing
Stellite50-60% Cobalt, 30-40% ChromiumExcellent wear resistance, oxidation resistanceAerospace, turbine blades, industrial machinery