What is a Foundry Furnace?

A foundry furnace melts metal materials in a lined vessel that holds both the material to be melted and provides the energy needed to melt it. Foundry furnaces, also known as casting furnaces, use design to combine both the metal materials and the necessary fuel to melt materials. These furnaces come in multiple sizes and desired temperatures. The type of metal being used determines the type of foundry furnace used. Cast iron foundries require a cupola or induction furnace, while bronze and aluminum foundries both use crucible furnaces.

Types of Foundry Furnaces

Induction furnaces

Commonly used in foundries, induction furnaces offer high-quality and ease-of-use. The average induction furnace produces 65 tons of steel at each charge. In steel melting induction furnaces, the steel changes into a crucible and an electromagnet made of coiled copper surrounds it. The coil creates a reversing magnetic field and causes eddies in the melting metal. Eddies then self-stir the steel. Excited molecules in the metal make the induction furnace’s heat, which means there’s no addition of oxygen or other gasses into the furnace.

Crucible furnaces

A very simple furnace, crucible furnaces handle high temperatures. The crucible is placed into the source of heat and filled with metal and additives. Crucible furnaces range in size from a very small cup to a large kiln-like furnace. Crucible furnaces are often used by jewelry makers and hobbyists.

Cupola furnaces

Cupola furnaces, a long, chimney-like furnace, get filled with coal-coke and additives and lit. Metal is then added directly to the furnace. Some foundries still use cupola furnaces. This type of foundry furnace is less commonly used as today’s induction furnaces offer improved efficiency.

Electric arc furnaces

An electric arc furnace uses electrodes to run an electrical current through the metal inside the furnace. Foundries usually use these types of furnaces of large slabs and beams and shredded scrap. When the tank of the furnace is filled with metal, electrodes are placed into the metal and an arc of electricity passes between them to melt it. Oxygen might be added to the process.

How Foundry Furnaces are Used

Primarily used in metalworking, foundry furnaces develop metal castings. Due to their strength and durability, metal castings are perfect for heavy machinery. The automobile, railroad, farming, and architecture industries often use metal casting. Metal castings can also be used for art and jewelry, as well as structural objects and instruments from iron and brass castings.

Sentro Tech Foundry Furnaces

Sentro Tech is a leading manufacturer of custom high-temperature foundry and casting furnaces. These furnaces allow you to alter atmospheric conditions during a single firing cycle. Customize any model to meet your exact specifications. Reduce costs for laboratory and small-scale production environments by customizing any model to meet your exact specifications.


Learn more about Sentro Tech foundry furnaces