Δαφνη Ευτυχια Αρθουρος

I may be waythehell offbase, but there was a project a few years ago to find non-war uses for Soviet tank armor, and it fit a lot of your requirements. (It's also incredibly dense, incredibly heavy, and smells like a closetful of wire coat hangers.)

Sorry I can't come up with something better. Perhaps look for a metallurgic website?