I need an alloy option for a 400C dry chlorine service.  Pressure is low <50 psig.  Application is as a melting tank and reactor for a molten metal reaction.   Reactor design temperature is probably 450C or better.   
Any ideas.   The reactor is small maybe 10 gallons so exotic alloys are acceptable.

Valves that use a tapered plug that rises and falls might be best.gate valve
Picking an alloy to handle the metal will be the trick.
If this is really dry, like -80C dew point dry, then you don't have much concern for regular corrosion mechanisms.  Just make sure that it never gets exposed to the air.

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