1. Grey Cast Iron
(a) Cupola
(b) Air furnace (or Reverberatory Furnace)
(c) Rotary furnace
(d) Electric arc furnace
2. Steel
(a) Electric furnaces
(b) Open hearth furnace
3. Non-ferrous Metals
(a) Reverberatory furnaces (fuel fired) (Al, Cu)
v Stationary
v Tilting
(b) Rotary furnaces
v Fuel fired
v Electrically heated
(c) Induction furnaces (Cu, Al)
v Low frequency
v High frequency.
(d) Electric Arc furnaces (Cu)
(e) Crucible furnaces (AI, Cu)
v Pit type
v Tilting type
v Non-tilting or bale-out type
v Electric resistance type (Cu)
(f) Pot furnaces (fuel fired) (Mg and AI)
v Stationary
v Tilting