Here is the "cheap metal" material. By cheap, I mean it doesn't cost a lot of computer power to use it. It's only for metals with a soft finish. Shiny metal needs reflection.

I said it would be only one node, and it is, but I added another node to control color. In metals, the specular color is the same as the diffuse color (generally). For a gray metal, we make the color white, but make the diffuse reflectivity very low. It is .02 here. I will show you others.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)