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METALWORKING PROCESSES - Coggle Diagram

- - - - carbon steel
      - low-alloy steels
      - high-alloy steel
    - - Pig iron is impure and brittle
      - most impotant kinds of furnaces
        
        open-hearth furnaces
        
        electric arc furnaces
        
        basic oxygen converters
- - - - where a liquid is poured
  - - - oldest technique
    - - that employs reusable moulds