Alloy steel and cemented carbide steel
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What is the difference between alloy steel and cemented carbide steel used for welding on valve sealing surfaces???????? Thank you!!!!!!
The surfacing material used for valve sealing surfaces is basically Stellite alloy, which has cobalt as its main component and contains significant amounts of nickel, chromium, and tungsten, as well as small amounts of alloying elements such as molybdenum, niobium, tantalum, titanium, and lanthanum. It possesses strong corrosion resistance and high hardness (HRC 40–47), which makes it suitable as a hardening material to protect valves against cavitation and erosion. Of course, there are other methods for hardening valves, such as nitriding, spraying (e.g., tungsten carbide, Ti, etc.), and plasma spraying.