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Nickel alloy tubing in the petrochemical field has a variety of application advantages, mainly reflected in the following points:
Excellent corrosion resistance
Resistance to a variety of corrosive media: petrochemical production often involves a variety of acids, alkalis, salts and organic compounds and other corrosive media. Nickel alloy tubes have excellent resistance to these media, for example, Hastelloy series tubes can resist the corrosion of sulfuric acid, hydrochloric acid, nitric acid and other strong acids as well as salts such as chlorides, which can be used in pipeline systems for the transportation of corrosive raw materials and products, greatly prolonging the service life of the pipeline, and reducing the cost of maintenance and safety risks caused by pipeline corrosion and leakage.
Anti-stress corrosion cracking: In the petrochemical environment, the pipeline not only bears the corrosion of the medium, but also may produce stress due to pressure, temperature changes and so on. Nickel alloy has good anti-stress corrosion cracking performance, which can avoid cracks or even breakage of pipelines due to the synergistic effect of stress and corrosion, and ensure the safe and stable operation of pipeline systems. For example, Inconel 625 alloy pipe is not easy to occur stress corrosion cracking in the high temperature environment containing chlorides, and can be used for high temperature and high pressure pipelines of offshore oil platforms.
Good high temperature performance
High-temperature strength: many reactions in the petrochemical process need to be carried out at high temperatures, nickel alloy tubing at high temperatures can maintain high strength. Such as Incoloy 800H alloy pipe, in the high temperature environment has good creep strength, can withstand high temperature pressure and medium scouring, to ensure that the pipeline in the long term high temperature operation process does not deformation or rupture, suitable for petroleum refining in the heating furnace pipeline, cracking furnace pipeline and other high temperature parts.
Antioxidant: Nickel alloy can form a dense oxide film at high temperature, which has good antioxidant performance. This oxide film can prevent further oxidation reaction and prevent the inner wall of the pipeline from thinning or producing corrosion products due to oxidation, which will affect the performance of the pipeline and the quality of the medium. For example, Haynes 230 alloy pipes can be used in high temperature reactors and heat exchanger pipes in petrochemical industry in high temperature oxidizing environments, where the oxide film on the surface can effectively protect the substrate.
Excellent processability
Easy molding: nickel alloy tubing has good plasticity and processability, easy to mold through cold or hot processing, and can be made into a variety of specifications and shapes of pipelines to meet the complex pipeline layout and installation requirements in petrochemical plants. For example, nickel alloy pipes can be bent into elbows of different angles, processed into variable-diameter tees and other fittings, which are convenient for connecting different equipments and pipelines to realize the smooth flow of the process.
Good welding performance: nickel alloy pipes have good welding performance and high quality welded joints, which can ensure the sealing and strength of pipeline connections. In the construction and maintenance of petrochemical plants, welding is an important process of pipeline installation and repair, and the good welding performance of nickel alloy tubes helps to improve the construction efficiency and quality, and reduce the risk of welding defects and leakage.
In conclusion, nickel alloy tubing plays an important role in the petrochemical field by virtue of its excellent corrosion resistance, good high-temperature performance and excellent processing performance and other advantages, and is one of the key materials to ensure the safe, stable and efficient operation of petrochemical production.