A carburizing furnace is an important engineering device that is used for carburizing. It is mainly utilized for hardening and processing facilities. The whole process involves the diffusion of carbon into steel. In Carburizing furnace process the interior of the furnace is heated and the source gas is introduced to provide a source of carbon, whereupon a chemical reaction occurs at 850-1000°C which diffuses the carbon into the steel. The quantity of carbon that is diffused into the steel is called the carburization performance which is normally displayed as a carbon potential (CP) value.

Variables of Carburizing Process
The gas carburization process depends upon following variables Temperature Time and Atmosphere composition. Other important variables affecting the amount of carbon transferred to parts include the degree of atmosphere circulation and the alloy content of the parts steel. It is the outer layer where the carbon is absorbed into the outer layers of the components.

Types of Carburizing Furnace

Gas Carburizing Furnace
The gas carburizing furnace enable both traditional and high-temperature carburizing, and provide optimum control over heating uniformity and atmosphere. The atmosphere is controlled by highly accurate oxygen probes. These probes helps in the prevention of excess free carbon, which can cause sooting. The furnace is designed in such a way which takes special care with fixturing, quenching and tempering, in order to insure a final result which meets the requirement of hardness, case depth and dimensional integrity. Gas carburizing furnace can be of available in different sizes and can be divided into two major categories - batch and continuous furnaces.

Continuous Carburizing Furnace
In a continuous carburizing furnace the work enters and leaves the furnace in a continuous stream. Continuous furnaces are suited for the high-volume production of similar parts.
In roller hearth type of carburizing furnace products are more stable because a cylindrical shell enables good temperature and atmosphere control.
Rotary Drum Type continuous carburizing furnace on the other hand is more useful for process involving small parts-supplying, carburized hardening, washing, tempering and removal are carried out continously in a completely integrated heat treating system.

Batch Type carburizing Furnace
The batch type furnace is designed in such a way that the workload is charged and discharged as a single unit or batch.

Vacuum Carburizing Furnace
Vacuum carburizing gas furnace also comes in two forms- batch and continuous. A continuous carburizing furnace consist of a heating chamber, conditioning chamber, carburizing/diffusing chamber, a second conditioning chamber, and a cooling chamber. Heating chamber is meant for heating a workpiece under a atmospheric pressure from here the work piece is passed to the first heating chamber. The work piece is then treated in a carburizing/diffusing chamber . A cooling chamber is used for cooling the workpiece which it receives from the second conditioning chamber under the atmospheric pressure. Apart from this there is a door which opened/closed only when the workpiece is transported from one chamber to another.

Features

• It is easy to operate and installation
• The carburizing furnace has better insulation system
• The furnace is protected from overheating
• The temperature is distributed uniformly
• The heat and temperature can be regulated and controlled.

Applications

• Hardening
• Annealing
• Brazing
• Nitriding
• Heat treatment