Superior performance of nickel-chromium Cr20Ni80

High temperature resistance of nickel-chromium Cr20Ni80:
1. High melting point: Cr20Ni80 alloy has a high melting point, about 1400 - 1450℃. This allows it to maintain a solid structure in a high temperature environment and is not easy to melt quickly due to temperature increase, providing basic conditions for its application in high temperature industrial fields. For example, in the manufacture of heating elements for high-temperature heat treatment furnaces, the material needs to not melt and deform under long-term high-temperature operation. Cr20Ni80 can do a good job with its high melting point characteristics.
2. Good high-temperature strength: Cr20Ni80 can still maintain good strength under high temperature conditions. As the temperature rises, the strength of most metal materials will drop rapidly, but Cr20Ni80 alloy can maintain high strength within a certain temperature range through its special chemical composition and microstructure. Taking 1000℃ as an example, it still has enough strength to bear its own weight and possible external stress, and will not creep or deform excessively due to high temperature. This is crucial for components that bear mechanical loads in high temperature environments, such as support components in some high-temperature piping systems.
3. Strong oxidation resistance: In high temperature environment, the material easily reacts with oxygen to form an oxide layer. At high temperature, a dense chromium oxide (Cr₂O₃) protective film will form on the surface of Cr20Ni80 alloy. This oxide film can not only prevent oxygen from further diffusing inward and reacting with the base metal, but also has good adhesion and stability. In the common high temperature range of 800-1200℃, this oxide film can continuously and effectively protect the alloy matrix, slow down the oxidation rate, and extend the service life of the material. For example, in the lining material of high temperature furnaces, this strong oxidation resistance can ensure that the material is not rapidly corroded in a long-term high temperature oxidation environment.
Corrosion resistance of nickel-chromium Cr20Ni80:
1. Acid corrosion resistance: For most non-oxidizing acids, such as dilute sulfuric acid, hydrochloric acid, etc., Cr20Ni80 alloy has a certain corrosion resistance. The presence of nickel improves the thermodynamic stability of the alloy, making it less likely to undergo electrochemical reactions and be corroded in acidic solutions. Chromium can form a passivation film on the surface of the alloy, further hindering the contact between the acid and the base metal and reducing the corrosion rate. In some chemical production, the storage and transportation of dilute acid are involved. Containers or pipes made of Cr20Ni80 alloy can resist acid corrosion to a certain extent and reduce the risk of leakage.
2. Alkali corrosion resistance: Cr20Ni80 also has good corrosion resistance to many alkaline media. In an alkaline environment, a series of chemical reactions will occur on the surface of the alloy to form a protective film layer to prevent further corrosion of the alloy by alkaline substances. In the cooking liquid (mostly alkaline) treatment equipment of the papermaking industry, the use of Cr20Ni80 alloy materials to manufacture related components can effectively resist the corrosion of alkaline cooking liquid and ensure the long-term stable operation of the equipment.
3. Salt solution corrosion resistance: Cr20Ni80 also exhibits good corrosion resistance in various salt solution environments. On the one hand, the chemical composition of the alloy gives it good resistance to electrochemical corrosion, because salt solutions are usually electrolyte solutions, which are easy to cause electrochemical corrosion of metals. Cr20Ni80 alloy reduces the driving force of electrochemical reactions by adjusting its own electrode potential, thereby reducing the tendency to corrode. On the other hand, the passivation film on the alloy surface can also remain relatively stable in salt solutions, preventing corrosive ions such as chloride ions from damaging the matrix. For example, some equipment parts in marine environments, because seawater contains a lot of salt, the use of Cr20Ni80 alloy can increase the corrosion resistance life of the parts in such complex salt solution environments.

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