Coreless Induction Furnaces is the coil, which consists of a hollow section of heavy duty, high conductivity copper tubing which is wound into a helical coil. Coil shape is contained within a steel shell and magnetic shielding is used to prevent heating of the supporting shell. To protect it from overheating, the coil is water-cooled, the water being recirculated and cooled in a cooling tower. This furnace has largely replaced the crucible furnace, especially for melting of high melting point alloys. This furnace is commonly used to melt all grades of steels and irons as well as many non-ferrous alloys.