what is a stellite?Is it a separate alloy material or Does stelliting mean some form of welding the base material for corrosion protection?

I beleive the material is cobalt chrome or chrome cobolt alloy. I used it in the Navy for rebuilding valve seats.

The filler metal was applied using SMAW, GTAW and OAW.

I think the name is a trade name from Stoody.

Stellite was also used in Navy valves for superheated steam, up to 1275 Psig and 975 degrees F.  The valves did seat metal to metal.  As pipewelder indicated, worn valves were routinely refurbished by weld build up and machining.

Stellite or tungsten carbide are used often on metal to metal seat & gate/ball/globe interfaces to ensure sealing contact area does not wear. No real rule of thumb but, the hotter or the more corrosive or the more erosive or the higher the pressure, the more likely it is to be used.

Stellite is also used on the business edge of forging trim dies, applied using oxyacetlylene torch and freehand ground to fit the forged part.  It's used on new trim dies and also for repair.  The trim dies need to be continually refit as the forging dies wear and the part grows.  This may not be the latest materials and methods.

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