HASTELLOY Alloy C-22 UNS N06022 Characteristics, Chemical Composition

Corrosion Resistance and Key Chemical Composition Analysis

 HASTELLOY C-22 (UNS N06022) is a high-performance nickel-based alloy with exceptional corrosion resistance in both oxidizing and reducing environments. It is a reliable material solution widely used in extreme industrial applications such as chemical processing, environmental protection, and papermaking.

HASTELLOY alloy C-22, with the unified designation N06022, is a comprehensive nickel-chromium-molybdenum-tungsten alloy. Its most critical characteristic lies in its exceptional resistance to localized corrosion forms such as pitting corrosion, crevice corrosion, and stress corrosion cracking, making it a reliable choice in extreme industrial environments.

This corrosion resistance is primarily attributed to its balanced chemical composition. The high chromium (Cr) content confers the alloy with strong passivation capabilities in oxidizing media (such as wet chlorine gas and nitric acid mixtures); while the synergistic effect of molybdenum (Mo) and tungsten (W) significantly enhances its stability in reducing environments (such as sulfuric acid and hydrochloric acid). This unique combination of elements makes HASTELLOY C-22 alloy one of the few materials capable of withstanding both of these extreme environments simultaneously.

In addition to its chemical resistance, alloy C-22 also exhibits excellent mechanical properties and machinability. It maintains its strength at high temperatures and is easy to weld and form. These comprehensive advantages make the application scope of UNS N06022 extremely broad, covering everything from flue gas desulfurization systems and reheaters, to reactors and heat exchangers in the chemical processing industry, to bleaching equipment in the pulp and paper industry, and industrial waste treatment systems.

As a professional metal piping service provider, MTSCO has accumulated extensive experience in the nickel alloy field since entering the industry in 2015, leveraging our “factory cluster” model. We can reliably supply the full range of HASTELLOY C-22 products to global customers in accordance with international standards such as ASTM and EN, including seamless tubes, fittings, flanges, coils, and wire. MTSCO is committed to providing a one-stop solution from material selection to delivery, and supports third-party inspections by SGS, TUV, and others to ensure that every step meets your highest standards for quality and reliability.

Alloy C22 / UNS N06022 Nickel Alloy C22 Seamless Heat Exchanger Tube