We currently specify Waukesha metal 88 as the core and stainless steel T316L as the body (cast). What other materials would be a good alternative for the  ball valve core?
Things to consider
machining characteristics, Dimensional stabitity, grinding tapers to a fine tolerance,Wear resistance to abrasive liquids,Similar rate of thermal expansion to S/steel to avoid binding filling hot products.
Resistance to chemical attack, CIP fluids etc...
A typical cost/benifit question, and unable to be answered without knowing much more.
1. Why change? Price of material only, wanting to earn more.
2. If yes: upping the price of the product radically, selling on cost/lifetime argumentation?
3. If no price compensation possible, searching cheaper and better material: better include re-thinking of the whole contraption, other material only will probably not contribute very much, and you have to include cost of retooling, re-establish and readministration of the fabrication and marketing side.

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