In this video for Hard surface modeling with Blender 2.9 I explain how to create metallic grids and curves / tubes. I am using my free JMesh Tools addon for this, but also without the addon you can see how to use the Wireframe and Bevel modifiers.
I also announce two great hardsurface courses by the Blender Bros, you can get them by following these affiliate links:
SciFi Mech Design in Blender: https://gumroad.com/a/833614963/VbKpb
SciFi Crate Design in Blender: https://gumroad.com/a/296744051/QERDS
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Production Music courtesy of Epidemic Sound: http://www.epidemicsound.com