In this video we look at how to create Brushed Metal and surfaces that have Anisotropic Highlights. We also take a look at making Tangent/Directional maps for these highlights procedurally as well as how to convert a Grayscale Directional Map to a Tangent Map easily in the Material Editor.
https://dev.epicgames.com/community/learning/tutorials/oWrv/unreal-engine-brushed-metal-anisotropy-material-anisotropic-highlights-tutorial