Material Introduction to Incoloy 926

Incoloy 926 is a super austenitic stainless steel containing 6% molybdenum, and its performance is enhanced by the addition of nitrogen. The presence of nickel and chromium provides excellent corrosion resistance in a wide range of environments. This alloy exhibits strong resistance to non-oxidizing acids such as sulfuric and phosphoric acid. The high molybdenum content and nitrogen enhance its resistance to pitting and crevice corrosion, while the copper content improves its resistance to sulfuric acid. It offers outstanding corrosion resistance in many highly corrosive aqueous environments.

One of the standout features of Incoloy 926 alloy is its excellent resistance to environments containing chlorides and halides. This alloy is particularly suitable for handling environments with high chloride content, such as brine, seawater, corrosive chlorides, and the bleaching systems in pulp mills. Its applications include chemical and food engineering, pulp and paper bleaching equipment, marine and offshore oil platform equipment, evaporators in salt plants, atmospheric pollution control systems, and the condenser pipelines, circulating water systems, and supply water heaters in power plants.

Corresponding Grade

chemical composition

physical property

Corrosion Resistance: Incoloy 926 is an austenitic stainless steel alloy, similar to Alloy 904L, with a nitrogen content of 0.2% and a molybdenum content of 6.5%. The presence of molybdenum and nitrogen significantly enhances its resistance to crevice corrosion. Additionally, the nickel and nitrogen not only improve the stability of the alloy but also reduce the tendency for grain boundary precipitation during thermal processes or welding, which is superior to nickel alloys with similar nitrogen content. Incoloy 926 exhibits considerable corrosion resistance in the presence of chloride ions due to its superior local corrosion performance and its 25% nickel content. Various experiments conducted in limestone-gypsum desulfurization slurries with chlorine concentrations ranging from 10,000 to 70,000 ppm, pH levels between 5 and 6, and operating temperatures between 50°C and 68°C demonstrate that, over a trial period of 1 to 2 years, Alloy 926 shows no signs of crevice or pitting corrosion. Additionally, Alloy 926 exhibits excellent corrosion resistance in other chemical media, even at high temperatures and concentrations, including sulfuric acid, phosphoric acid, acidic gases, seawater, salts, and organic acids. Moreover, to maintain its excellent corrosion resistance, regular cleaning is essential.