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The continuous casting process is to make the chemical composition and temperature of molten steel meet the casting requirements after the molten steel smelted by the converter is treated. The qualified molten steel is cast into a double flow continuous casting slab with a certain thickness and width through a double flow slab caster. After the double flow slab is out of the caster, it is cut into a certain size of qualified billet by a flame cutter. Among them, the first-class billets are directly transported to the furnace entrance roller table in front of the heating furnace in the rolling workshop through the roller table, and the other first-class billets are also transported to the furnace entrance roller table in front of the heating furnace in the rolling workshop through the ferry of the roller table trolley. Finally, the two streams of billets become the billets of the medium and wide band rolling mill.