Crossword Title simon

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Across
  1. 3. a way of processing metals that is also a word used in maths
  2. 4. base of duralumin
  3. 5. heats and cools metals normally
  4. 7. materials being reshaped without losing material
  5. 8. metals containing iron
Down
  1. 1. type of case hardening which diffuses nitrogen into the surface of a metal
  2. 2. joining materials together
  3. 6. a combination of two or more metals