UNS N10276, DIN 2.4819, EN NiMo16Cr15W,JIS NW 0276, ASME SB-574, ASME SB-575, ASME SB-619
Alloy C276 is one the variations of Hastelloy which is a nickel chromium molybdenum alloy. It has various additions as well. The addition of tungsten provides strength to this alloy. It is a highly corrosion resistant alloy. The molybdenum and nickel contents provide the alloy with very high pitting corrosion resistance. The chromium content in the Hastelloy C276 UNS N10276 makes it resistant to oxidizing media. The alloy’s carbide precipitation during welding is very less as there is very less carbon content in the composition. The DIN 2.4819 material has the optimum strength, corrosion resistance and the cost benefits among the range of Hastelloy. Therefore it is the most widely used variation. The material has resistance against wet chlorine gas, chlorine dioxide and hypochlorite. It is resistant to corrosion in welded joints as it minimizes the intergranular precipitation during welding. The resistance to reducing agents is significant. The alloy is resistant to strong oxidizing agents such as salts. All of these mechanical properties are due to the specific chemical mixture. The Hastelloy C276 chemical composition has nickel, molybdenum, chromium, iron, tungsten, cobolt, manganese, carbon, vanadium, phosphorus, silicon and sulfur. The material is used in fuel gas desaulfurization systems, sour gas wells, pulp and paper industries, waste water treatement and in pollution control systems. There are not many Hastelloy C276 equivalent materials but other Hastelloy grades can sometimes be used in place of the Hastelloy c276.
Versatile corrosion-resistant alloy, usually does not need to be solution heat treated after welding and has vastly improved fabricability, excellent resistance to localized corrosion and to both oxidizing and reducing media. Resists formation of grain-boundary precipitates and is therefore suitable for chemical process applications in the as-welded condition. C-276 has excellent resistance to strong oxidizers like ferric and cupric chlorides, hot contaminated media (organic and inorganic), chlorine, formic and acetic acids, acetic anhydride, seawater, brine solutions, sulfur compounds, wet chlorine gas, hypochlorite and chlorine dioxide.
