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Korea Iron & Steel Association                                 Chapter 3●Tour of a steel mill
                                           Once the molten iron hardens,
                                           the furnace can’t be used again. So                                               A lot goes into making a   That’s right. When hot molten
                                           this plant cannot shut down; it operates 24/7.                                         steel product!      steel is placed into molds and
                                                                                                                                                      cooled to harden, it becomes
                                                                                                                                                    semi-finished products, known as
                                                                                 You watch                                                             slabs, billets, and blooms.
                                                    A steel mill              too many movies.
                                                   never sleeps.

                                                                                                                                                       Billet
                                                                                                                                                       Billet
                                                                       (Proud)                                                                                           Slab
                                                                       (Proud)
                                                                                                                                                                         Slab



                                                                                                                                                             Bloom
                                                                                                                                                             Bloom
                                                                                                                                                Remember how you prepared the    When the molten steel becomes a
            Look at that big jar. That's what's called a ‘converter.’                                                                            dough before making noodles?                                              hard solid(semi-finished product),
            Molten iron fresh from the furnace is called ‘pig iron.’                                                                                  This is no different.       it goes through the final process
            It still contains some impurities.                                                                                                                                   that turns the iron into a steel plate.
                                                                                                                                                                  I see.
                                                                                                                                                                  I see.









                                                           Wow!
                                                           Wow!



                                                                                                                                                          A semi-finished product
                                                                                                                                                        is passed between a number
                                                                                                                                                          of rotating rolls to stretch
          When those impurities are                                                                                                                      and press it thin by applying
                                                                                                                                                                                              (Nod)
         removed in the converter, it                                                                                                                        continuous force.                (Nod)
          becomes workable molten
         steel, deemed adequate for
                                                                                                                                                                          Roll
                steelmaking.                                                                                                                                              Roll


                                     Oh!
                                     Oh!
                                             A-ha!
                                             A-ha!
                                                                                                                                                                (Nod, nod)
                                                                                                                                                                (Nod, nod)





                              When the fire is extinguished, the molten iron in the furnace will harden, rendering the furnace
            Tidbit            unusable. Astronomical cost and time is needed to destroy the furnace and to build a new one.   Tidbit          Steel plates used to make beverage containers and tuna cans is about 0.15 mm in thickness. That's
                              Therefore, steelmaking furnaces operate 24/7.                                                                   as thin as paper.


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