Simple procedural rusty old metal material. Forget about confusing materials with a lot of settings. Here everything is simple and fast.
Use it and get amazing results!

This material can also be found in Awesome Materials Pack (1.42$ per material).

Compatible with Eevee.
Preview images rendered in Cycles with hdri (not included).

This material can be used for old rusty metal parts, old rusty machinery, metal debris.

Examples of using
(Demo models not included)