These fittings are primarily made of chromium and nickel, with added columbium (niobium) and tantalum to enhance stability against carbide precipitation. The 348H variant has a higher carbon content, which improves its high-temperature strength and creep resistance. They boast excellent mechanical properties, including high tensile and yield strength, good ductility, and outstanding resistance to oxidation and corrosion. Their well-balanced composition ensures they maintain structural integrity and performance even under high temperatures and pressures.
