A basic stainless steel has a 'ferritic' structure and is magnetic.

I make a variety of auto-related connectors for fuel lines, AC, etc. Many of these are stainless. Some are of the "cheaper" stainless magnetic variety. One example is the ring you see around the door and trunk locks on some Cadillacs.

Don't bother with Ti. Just get some SS screws from the hardware store. I did that years ago for my commuter which sees plenty of road salt and they're still rust-free.