Inconel® Alloy 690

Properties of Inconel® Alloy 690

The primary property of Inconel® 690 is its excellent corrosion resistance in both wet and dry, oxidizing environments. Its high chromium content—significantly higher than most other nickel alloys—offers superior protection against aggressive acids, particularly nitric acid, even at high temperatures.

The alloy also exhibits high thermal stability, good oxidation resistance, and resistance to stress corrosion. Inconel® 690 is highly weldable and retains its strength at temperatures above 800°C, making it suitable for use in demanding industrial environments.

Thanks to its good mechanical properties and structural integrity, this alloy is ideal for long-term use in installations with chemical exposure and high process temperatures.

Applications of Inconel® Alloy 690

Inconel® 690 is used in applications where extreme chemical corrosion, heat, and structural reliability are essential. Examples include:

• Tail gas reheaters in the production of nitric acid

• Heating coils and tanks for nitric-hydrofluoric solutions (e.g., for pickling processes of stainless steel)

• Coal gasification plants, burners, and pipes for sulfuric acid processing

• Furnaces in the petrochemical industry, including incinerators

• Gasification equipment for the storage and processing of radioactive waste

Due to its combination of chemical resistance, thermal stability, and mechanical reliability, Inconel® 690 is highly suitable for critical processes in the chemical, energy, and nuclear sectors.

Inconel® Alloy 690 is the ideal alloy for aggressive environments where corrosion, heat, and reliability converge.