Stellite 6 can probably be successfully applied to duplex stainless. In the past I've developed procedures for Stellite 6 on P8, but, I don't have first hand experience on P10H. For specific information I'd suggest you contact the folks at Deloro Stellite.
KimberleyS,
Perhaps I should have qualified that you were not talking about a strength weld between duplex and St6. As you probably know, that wouldn't be a good idea.