Where did all the metal go?

Thanks for the lesson in metallurgy!

At risk of a tangent, why exactly was iron so popular as a material for making weapons? I’m guessing at some of the things a weapon maker might consider:

  1. how common is it
  2. how easy is it to shape into something
  3. how hard is it
  4. does it hold an edge
  5. how does it handle impacts it might experience in combat
  6. how long will it last
  7. how heavy is it
  8. how easy is it to repair
    Anything I’m missing?
    I’d like to have some means of evaluating the materials suggested in Substitutes for Metal thread
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