Steelmaking by Induction Furnace Mar26

Steelmaking by Induction Furnace...

Steel making by Induction Furnace Though induction furnaces are being used since a long time, the production of mild steel by the induction furnace (IF) is relatively a very recent phenomenon. Induction furnaces work on the principle of electromagnetic induction which was discovered by Michael Faraday. History In 1870 De Ferranti started experiments in Europe on induction furnaces. The first induction furnace for melting metals was patented by Edward Allen Colby in 1900. The first steel made in an induction furnace in United States was in 1907 in a Colby furnace near Philadelphia. First 3 phase furnace was built in Germany in 1906 by Rochling- Rodenhauser. In India the use of induction furnaces started in mid sixties. Imported medium frequency induction furnaces were used from mid seventies. Early eighties to mid nineties sudden growth has taken place. During this period indigenous manufacture of the induction furnaces also started. Initially induction furnaces were used for melting stainless steel scrap but these furnaces are used for mild steel production from mid eighties. Characteristics of Induction furnace There are mainly two types of the induction furnaces. They are given below. i) Induction channel furnace – In this furnace induction heating takes place in the channel which is a small and narrow area at the bottom of the main bath. The channel passes through a steel core and the coil assembly. Such type of furnaces are not been used for the steel making. ii) Induction crucible furnace- This type of the furnace is also called coreless induction furnace. It is a refractory lined vessel (Crucible). Its other main components are power supply unit consisting of transformer, inverter and capacitor bank, the charging arrangement, the cooling system for the power supply and furnace coil, process control system and the...