Carburizing is a case-hardening process in which carbon is dissolved in the surface layers of a low-carbon steel part at a temperature sufficient to render the. Gas carburizing is a surface-hardening process that is carried out at a high temperature, usually above °C. Carburizing is essentially the addition of carbon. Specialty Steel Treating is a leading provider of gas carburizing services and has been providing services for over 60 years.

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Carburizing[1] carburising chiefly British Englishcarbufising carburization is a heat treatment process in which iron or steel absorbs carbon while the metal is heated in the presence of a carbon-bearing material, such as charcoal or carbon monoxide.

Some of the considerations involved in setting up processes include: Corrosionpedia explains Gas Carburizing The process is usually conducted in a sealed quench furnace in which a carburizing gas is introduced. Combining the two laws leads to a partial differential equation that describes the diffusion process.

It is also true that carbides are produced at lower carbon potentials in chromium-bearing steels than in carbon steels. Have a specialist contact you. Carburization of steel involves a heat treatment of the metallic surface using a source of carbon.

This page was last edited on 9 Augustat It is the difference in carbon potential that provides the driving force for carbon transfer to the parts. Hence the oxygen probe can be used to determine the carbon activity of the atmosphere, and the carbon potential can be shown to be a function of carbon activity actemperature and steel composition q.

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Carburizing Process and Techniques – Four Methods of Carburizing

The setpoint may give a boost phase where the carbon potential would be typically set farburising 1. This service is widely used for surface hardening process of various components. This layer is applied on a tough low carbon steel nucleus. After selecting the material of interest to you, click on the Heat Treatment link to view data for the selected material.

Corrosion of Zirconium Alloys: They are never close to equilibrium. Creating Tougher Steel Elements This special case-hardening process is done at precise temperatures overseen by our experienced technicians. History of ferrous metallurgy List of steel producers.

Since the environment used for heating is oxygen free, the carburizing temperatures can be considerably increased gzs surface oxidation. The amount of these changes varies based on the type of material that is used, the carburizing process that the material undergoes and the original size and shape of the work piece.

By using the thermochemical equilibrium constant for the above reaction the carbon activity of the atmosphere can be calculated:. In batch furnaces, parts can be heated in Endogas until they reach the furnace temperature; then carburizing can commence with the addition of the enriching gas.

Gas Carburising Process

The intent is to make the metal harder. This service is used to increase the wear resistance and fatigue life of components.


The steel components are submerged in a liquefied carbon rich environment. Conversely, shallow case carburizing is frequently done at lower temperatures because case depth can be controlled more accurately with the slower rate of carburizing obtained carbyrising lower temperatures.

Carburizing Process and Techniques – Four Methods of Carburizing

Eurotherm provides heat treat control solutions for both types of furnaces, as well as other metal treating processes such as: Similarly, additional diffusion and interchange of carbon with the atmosphere will occur during cooling prior to quenching. Many of the problems with pack carburizing are eliminated in this process. A ga of carbon activity a c is: Add only Endogas to the front of the furnace.

Both carburiaing machinability of steel and its hardness depend on the amount of carbon present inside its structure. Such atmospheres will also deposit soot on surfaces within the furnace, including the parts. All available heat treatment information will then be displayed yas the chosen material. The higher temperatures increase the carbon solubility and the diffusion rate. Low hydrogen Short circuit.

The resulting gradient in carbon content below the surface of the part causes a gradient in hardness, producing a strong, wear-resistant surface layer on a material, usually low-carbon steel, which is readily fabricated into parts.