Hastelloy C-22 has found major applications in the chemical, petrochemical processing, pollution control, power production, marine systems, pulp and paper processing and waste industries. The alloy actively resists oxidation, carburization and sulfidation at high temperatures. It prevents high temperature corrosion by halides such as chlorides and halides. This super alloy is used to secure steel tubes and various other components in the coal- fired and waste to energy boilers. General corrosion prevention Hastelloy C22 prevents attack in reducing and oxidizing acids like sulfuric acid and hydrofluoric acids. It has extreme resistance against oxidizing acid chlorides, damped chlorine, formic and acetic acids, ferric and cupric chlorides, marine water, brines and contaminated chemical media including organic and inorganic solutions. High temperature services Alloy C22 is commonly used for offering outstanding service in the aqueous media, it also performs adequately in the high temperature service media about 1250oF for example Hastelloy C-22 wire is specifically found useful in the security of boilers, waterwalls and other parts in the coal fired electric generation boilers. The alloy has also offered supreme service in squat NOx boilers. The alloy prevents corrosion at the high temperatures by halides and sulfur that are usually seen in grades of coal used for power production. Hastelloy C22 also provides supreme resistance to severe corrosion by metal chloride and sulfate salts discovered in power production boilers involved in municipal solid waste incineration. Grade C22 is used to overlay the steel components through welding. The welds made from Hastelloy C22 prevent segregation as seen in Nickel – chromium – molybdenum – niobium alloys. To handle the severe emission limits, the fossil fuel and waste fired power production boilers are designed to add burners to limit the development of oxides of nitrogen. Enhanced security of boiler tubes and waterwalls for service in the severe environments is needed. Inconel 625 weld overlays have been utilized for a long time for the security of these boiler parts however the recent analysis shown that such overlays can experience circumferential cracking because of stress caused by sulfidation of the dendrite centers of the weld overlays within 18 months. Hastelloy C22 is developed fo-r applications that demand corrosion resistance in the severe service media. It is an increasing safeguard product that offers several benefits including enhanced life cycle cost service, higher reliability, nominal maintenance and decreased downtime cost. Alloy C22 has PREN (Pitting resistance equivalent number) 75 that is above 40 stating that it is extremely resistant to crevice attack in the marine water. Although in the very tight crevice media, for example in marine water cooled plate heat exchangers that receive tight crevices, use of Hastelloy C22 is recommended. The maximum attack depth by crevice attack after interaction with natural marine water at 29oC for 6 months is in reference of PREN. In the hot seawater at 60oC that is observed for two months, alloy C22 showed complete prevention of crevice signs. It was observed in offshore oil and gas plant seawater systems. Overall Hastelloy C22 offers the supreme service in the severe application media varying from seawater to chemical plants. |
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