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Temperatur tinggi pada proses smelting dapat dicapai dengan metode kuno yang sudah dipakai sejak zaman Tembaga. Karena tingkat oksidasi besi meningkat sangat cepat diatas suhu 800 °C (1,470 °F), maka harus diperhatikan bahwa proses smelting harus dilaksanakan pada lingkungan dengan tingkat oksigen rendah. Proses peleburan akan menghasilkan paduan yang dinamakan baja.[2] Kelebihan karbon dan pengotor lainnya dapat dihilangkan dengan beberapa proses bertahap.