Anvils have been made four ways. 1) Forged from wrought iron with a steel plate fire welded to the top (no longer done). 2) Forged from two pieces of steel and welded at the waist. 3) Cast from iron welding a steel plate to the top in the process (no longer done). 4) Cast in one piece from steel (most modern anvils). The best heat treated cast steel anvils rival forged anvils and should not be confused with cheap cast anvils (ASO's) made from
cast iron and not suitable for forging. -guru