Based on the Cr/Ni contents, your stated composition looks more like a fit with a duplex stainless steel casting. Do you have the specification for this alloy? Deliberate additions of Ti can serve several functions in alloys, as a deoxidizer, or as a strengthener for precipitation hardening capability and/or stabilizer to form TiC instead of harmful chromium carbides.
Can you provide more information as to your use of this alloy?