Inconel 690
High Corrosion & Heat Resistant Alloy

Inconel 690 (UNS N06690) is a high chromium, nickel based alloy that stands out for its exceptional resistance to high temperature oxidation and aqueous corrosion. With a chromium content of around 30%, it performs significantly better than Inconel 600 in resisting acidic and caustic environments. It also offers high mechanical strength, metallurgical stability, and excellent weldability, making it a reliable choice for long term use in nuclear steam generators, chemical processing plants, and marine applications.

Inconel 690 is widely used in industries that demand resistance to heat, pressure, and corrosion. In nuclear power plants, it is employed in steam generator tubing and heat exchangers exposed to high-pressure steam. Chemical industries use it in reactors, scrubbers, and piping systems handling hot acids and caustic solutions. It is also preferred in power boilers, superheaters, and marine condensers, as well as in aerospace, gas turbines, desalination systems, and even food and beverage processing equipment where hygiene and durability are essential.

Inconel 690 offers superior oxidation resistance at elevated temperatures, excellent resistance to hot acidic and alkaline solutions, and high structural stability under prolonged service conditions. Its strong metallurgical composition prevents pitting, stress corrosion cracking, and scaling, even in highly aggressive environments. Another advantage is its outstanding weldability, which makes it easier to fabricate into complex components without compromising its strength or corrosion resistance. These features make it more durable than alloys like Inconel 600 in critical applications.

The chemical composition of Inconel 690 is dominated by nickel (58% minimum) and chromium (27–31%), with controlled additions of iron, carbon, manganese, and silicon. The high chromium content ensures excellent resistance to oxidation and aggressive hot acidic environments, while nickel provides superior corrosion resistance in both reducing and oxidizing conditions. The balanced alloying elements contribute to mechanical strength, stability, and resistance to stress cracking, which is why Inconel 690 performs reliably in nuclear, chemical, and marine environments.

Moksh Tubes & Fittings LLP is a trusted global manufacturer, supplier, exporter, importer, and stockist of premium Inconel 690 products, offering a complete range that includes pipes, tubes, fittings, flanges, sheets, plates, coils, fasteners, and custom fabricated components. With extensive expertise in nickel chromium alloys, access to hard to source raw materials, advanced testing facilities, and a reliable international supply chain, the company ensures consistent quality and timely delivery. Customers choose Moksh Tubes & Fittings LLP for its commitment to precision, durability, and tailored solutions that meet the most demanding industrial needs.