Supply ON/OFF valve from size 4 up to 24 inch. Application is highly sour (H2S and CO2 and water and also a little CL). Material that costumer is ordered is A186 F6a for ball and also request for fully stellited of ball valve.  I asked with some ball valve manufacture for fully stelliting of ball but they didn't accept and do stelitting only contact area (areas contact between ball and seat ring). They don't consider high corrosive media that cause SCC on ball. The valve body (and bonnet if it is top entry) and stem are pressure retaining and require to be supplied per NACE.
The ball is not pressure retaining and not strictly required to conform to NACE.  Of course if it is closed for long periods the face of the ball will be under pressure and this part is stellited.
It makes sense to stellite the area in contact with the seats but not all of the ball.

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