Electric Arc Furnace

An Electric Arc Furnace (EAF) is a furnace that heats charged material by means of an electric arc. EAF range in size from small units of approximately one ton capacity up to about 400 ton units. Electric arc furnace differs from induction furnaces in that the charge material is directly exposed to the electric arc, and the current in the furnace terminals passes through the charged material.

For steelmaking, direct current (DC) arc furnaces are used, with a single electrode in the roof and the current return through a conductive bottom lining or conductive pins in the base. The advantage of DC is lower electrode consumption per ton of steel produced, since only one electrode is used, as well as less electrical harmonics and other similar problems.

Ship Propulsion

DC Machines are still used nowadays on ship propulsion, where usually 3 or more diesel generators, are used to supply medium voltage power to Isolation transformers, which feed 12 pulses non-regenerative SCR power bridges.

Rolling Or Break Down Mill

A Rolling Mill is a machine or factory for shaping metal by passing it between a pair of work rolls. Rolling mills are often incorporated into integrated steelworks, but also exist as separate plants and can be used for other metals, and other materials. Depending on the temperature of the metal being rolled, rolling mills are typically hot or cold rolling mills.