Check the place your handlebars connect to your stem. What about inside of the handlebars? Ok the handlebars could be not rusted. I have seen a rusted crmo frame. I'm sure if you really look for it you will find some rust in the frame somewhere. If not throw into the sea if you have one nearby and come back for it in 5 weeks.

Rust appears in the places most people don't bother to look.