Iron and steel

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Across
  1. 1. made from coal and almost pure carbon
  2. 5. chief ore of iron
  3. 9. mixture of nickel-chromium plus iron
  4. 10. impure iron
  5. 12. chemical element which strengths steel
  6. 13. chemical element used to recycle steel/iron
  7. 14. Transformation of iron and used by car producers
Down
  1. 1. mixture added at the top of the furnace
  2. 2. its chemical structure is CaCO3
  3. 3. type of iron used for steel
  4. 4. Extraction of iron from its ore
  5. 6. Metal that coats the 3rd word of the crossword
  6. 7. strongest type of steel
  7. 8. most soft type of iron
  8. 11. Composes the 6% as an element of the earth’s outer layer