Awesome Materials Pack
Contains 12 procedural materials that can be used in Cycles or Eevee.
Dirty Raw Metal
Rusty Old Metal
How it works
Each material is extremely easy to use and customizable. With different settings, you can get a lot of variations of each material.
Just append material to your scene, assign it to mesh and move sliders until you get needed result!
It may work fine without UV in some cases, but using UV is recommended.
The .pdf guide included.