I have to produce a data sheet for a globe valve in high chloride environment, i want to know if is better a disc in duplex F51 with stellite 6 hard facing or 17-4 PH (AISI 630) hardenable stainless steel.
Which is the cheaper solution? In my opinion the second one.
Is it advisable to use a 17-4 PH steel with a content of 160000 (160g/l) of chorides?

You don't mention other aspects of the service environment such as whether there is any H2S present in which case NACE MR0175/ISO 15156 Table A.27 might restrict the use of 17-4 PH steel.

There isn't H2S content in the water, so we are not in Sour Service Condition. I appreciate your answer. In any case for me is very interesting to know which solution is cheaper for a 10" Ball Valve and the main difference beetwen these 2 technical solutions. Thanks for your collaboration.

If you are looking for a TSO valve, a ball valve with metal to metal seats (tungsten carbide coated) will never be tight but will admit a leakage according ISO 5208 rate B as maximum sealing, more often it will be ISO 5208 rate D.
Temp/pressure is important to know ehter you can use cast material vs forged which will make the valve cheaper.

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