Vibranium? I'm afraid I haven't heard of that before. May not exist in my world, as far as multiverse theories go.
Strongest? For a weapon, you mean? I would hesitate to say tungsten. You could probably lift it as tungsten is heavy as hell, but it is strong and durable. I have some. Otherwise, steel reinforced with gold would work well. Chromium is a good solution if you want it to be strong and not scratched. I've got some of that, too.
Titanium could even work and is probably the easiest one for me to lift, but if you do the heavy lifting, I'm good with whatever metal we choose. You let me know what sounds good.
Excellent. This won't likely be the same unless we recruit the magical people to make something similar, otherwise I can fashion an ancient forge that will fo the same trick.