An electric arc furnace in steelmaking which melts scraps by arc heating, is one of the most important equipments in recycle system for iron and steel.
At present the product of electric steelmaking is about 30% of the crude steel.
Toward the 21st century, the neccesity of electric arc furnace becomes large in order to recycle scraps in clean environment.
In this paper the problem about Electro-Magnetic Interference of electric arc furnace in steelmaking, and countermeasure for these problems are described, such as flicker, harmonic waves and magnetic effect.