Valve internals
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What is the difference between the internal components STL.6 and Cr13 in valves? I’d appreciate it if experts could help answer this question. Thank you!
STL refers to tungsten-chromium-cobalt alloy, while Cr13 refers to alloy steel; the main difference between the two lies in hardness, which is reflected in their wear resistance
STL has better corrosion resistance, wear resistance, and high-temperature resistance, especially in terms of cavitation resistance; if the medium is steam, then STL is the choice
Is there a difference in usage? Stellite is more wear-resistant
STL .6 is a high-grade alloy; it can be considered a type of cemented carbide, resistant to various acids and alkalis, and possessing high hardness； Cr13 is the cheapest stainless steel, a martensitic stainless steel, used in environments with mild corrosion; it has low hardness
STL6 is a high-grade tungsten-chromium-cobalt alloy, a type of cemented carbide that is resistant to various acids and alkalis as well as possessing high hardness； Cr13 is a martensitic stainless steel used in environments with moderate corrosion levels. It has low hardness, and heat treatment is generally required to increase its hardness in order to be used as components inside valves; it cannot be used for movable valve cores, but can be used for bushings, sets (rings), cages, etc.