#steel_production__steelproduction  making steel from pig iron
  supertype:  production.human_action  the act or process of producing something; "Shakespeare's production of poetry was enormous"; "the production of white blood cells"
  subtype:  Bessemer_process  a process for making steel using a Bessemer converter to blast air through through molten iron and thus burning the excess carbon and impurities; the first successful method of making steel in quantity at low cost
  subtype:  open-hearth_process  a process for making steel using an open-hearth furnace

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