Seeking advice on the corrosion resistance of Stellite alloys
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Valve for liquid chlorine flow; liquid chlorine is purchased from external suppliers, and its water content is uncertain. Is it okay to use a 316L valve body for the control valve, and H.C. components for the valve spool, seat, and diaphragm? The equipment side suggests performing STL cladding on the valve core and seat; if the moisture content in liquid chlorine is high, will Stellite be resistant to corrosion in such conditions?
Stellite alloys are primarily resistant to high-temperature corrosion; as for corrosion by wet chlorine, it is advisable to consult professional sources and experts. Stellite alloys are too expensive, and they are not widely used in chemical industry piping and valves.
Yes, only the valve stem and valve core are subjected to surfacing treatment
Stalite can improve corrosion resistance.
Hardening of the valve seat and valve stem head in control valves is mostly done using STL; the corrosion resistance of STL is likely similar to that of 316L.
Stellite alloys belong to the cobalt-based alloy category; they offer slightly better overall wear resistance. After surface welding treatment, their corrosion resistance is only slightly better than that of 316 steel. In applications involving liquid chlorine, where pressures are low and pipe diameters are small, it is best to use linings, as this provides the best results at the lowest cost
Liquid chlorine cannot be handled with stainless steel valves, as a chemical reaction will occur; copper valves or valves lined with fluoropolymer material should be used instead
HC can be used for valve internals; Stellite does not perform well when exposed to chloride ions, so the original poster should be cautious
Thank you! ! ! Is it okay to use 316L for the valve body? Concerned that the moisture content in commercially purchased liquid chlorine may cause corrosion. . . The supplier states that the product is qualified if its moisture content is below 80PPM
It’s best not to use it; considering costs and performance, it’s safer to choose one with plastic lining.