Comparison of corrosion-resistant materials
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Which expert could provide a detailed comparison of the types of valve media suitable for each of these five materials, as well as the appropriate operating temperatures for CN7M, Hastelloy, Inconel, Monel, and Stellite?
CN7M: The alloy steel ASTM A351 exhibits excellent resistance to hot sulfuric acid corrosion, and is commonly used in pump casings and valves at temperatures up to +425°C. Hastelloy: a nickel-based corrosion-resistant alloy; it is mainly divided into two categories – nickel-molybdenum alloys and nickel-chromium-molybdenum alloys – and exhibits significant corrosion resistance to high-concentration chloride solutions such as ferric chloride and copper chloride. There are many grades available, with a temperature resistance of up to +1000°C. Inconel: an corrosion-resistant alloy; I don’t know much about it, but its temperature resistance is likely to reach around 1000°C as well. Monel: A nickel-copper alloy with excellent corrosion resistance; it is suitable as material for edge wires, and can also be used in valves, pumps, reaction vessels, shafts, etc. The melting point is around 1300 °C. Stellite: A cobalt-based cemented carbide that can withstand various types of wear and corrosion as well as high-temperature oxidation. It can be used to manufacture welding wires; its powder is employed in hardfacing processes, thermal spraying, spray welding, etc., and it can also be used to produce castings, forgings, and powder metallurgy components. The melting point is around 1200 °C. All of the above are non-standard materials. For reference only.