Steel. Only things containing iron can rust.
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warm water will rust metal faster
The application of rust is very useful to any metal where conductivity is critical.
Rust occurs when a metal oxidizes. The ingredients needed to make a metal rust is oxygen and breaking compounds such as the citric acid in orange juice or salty water in oceans.
Salt water does make nails rust faster than non-salted water, because when salt is added to water, it will rust the top layer of the nail, and then make the nail basically shed its top layer. Then the salt will rust that layer, and this process continues until the whole nail is rusted. Normal water can only really rust the top layer, and can't get to the rest of the nail.
rust