They can also be used for converting pig iron to steel, but they use a lot of electrical energy (about 440 kWh per metric ton), and are thus generally only economical when there is a plentiful supply of cheap electricity.
它也可用於把生鐵轉化成鋼，但需要使用大量電力（每噸需要約440 kWh），所以一般只能在有大量廉價電力供應的情況下才有經濟效益。