Geneva Steel

Induction Heated Furnace

In July, 1995, Geneva Steel rolled their first slab from a 42MW induction furnace using all solid state type frequency converter power supplies. This was the largest running installation in the world. The system was configured with 7 independent induction coil assemblies and power supplies rated for 6MW. Each induction coil assembly (approx. 65 inches long), was followed by a specially designed water cooled roll. The entire length of the furnace was approximately 50 feet.

The advanced system once operated in line as part of Geneva's continuous slab casting operation. Steel slabs up to 126 inches wide and up to 36 feet long and 8.6 inches thick entered the induction furnace system from soaking pits used as a hot buffer after the continuous caster, for a precisely controlled and complete reheat, and then moved directly to the rolling mill. Fast reheating rates(guaranteed production of 500TPH with a 300˚F increase in temperature), in-line capability with minimal line length required, precise temperature control and reduced surface oxidation obtainable with induction furnace systems were reasons Geneva cited for choosing this technology.

During the 6 years of operation, 80% of what Geneva rolled went through the induction furnace.

Reliability and production up time were excellent.