What are the most commonly used superalloys in piping accessories?

High Temperature and Corrosion-Resistant Alloys

Piping accessories in demanding environments require materials that withstand high temperatures, pressure fluctuations, and corrosive media. Nickel-based alloys such as Inconel 625 and Inconel 690 are commonly used for valve bodies, flanges, seals, and pipe connectors due to their excellent resistance to oxidation, chloride-induced corrosion, and stress cracking.

Applications in Aggressive Chemical Media

In chemical processing and offshore operations, superalloys from the Hastelloy family—such as Hastelloy C-22 and Hastelloy C-276—are favored for their superior pitting and crevice corrosion resistance. They are widely used in fittings and joints that handle acidic or chloride-rich fluids under elevated temperatures and pressure.

Wear-Resistant and Structural Alloys

Cobalt-based alloys such as Stellite 6 and Stellite 31 provide high wear resistance and excellent hot hardness, making them ideal for high-friction components like valve seats, pivot rings, and rotational joints. Their durability helps maintain sealing integrity and extends maintenance intervals.

Industry Applications

Superalloy piping accessories are widely used in oil and gas, chemical processing, and power generation systems where system reliability and fluid containment are critical. Their robust mechanical properties and corrosion resistance ensure consistent performance even in continuous or cyclic flow conditions.