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頭尾板 Coil heads and tails
廢鐵由廢五金業者集中分類後依序而上由小盤-中盤-大盤-具廢鋼DC電弧爐設備的大型工廠--經處理.溶解.精煉...等程序，再製成鋼胚、重複利用。
Steel scrap is assembled and sorted by downstream-to-upstream scrap metal factories, and then processed by the bigger factories with direct-current (DC) electric arc furnaces in which the steel scrap is melted, refined, etc. in order to produce billets.