What does carburise mean?
Carburise is a technical process used to give steel or another metal a carbon-rich surface. The metal is heated in contact with carbon or a carbonaceous atmosphere, allowing carbon to diffuse into its outer layer. This treatment can increase surface hardness and wear resistance, so it is common in toolmaking, gear manufacture, and the production of other components that need a hard exterior over a tougher core. Carburise does not mean to convert an entire object into carbon; that more general operation is carbonise. The verb is chiefly British, while American English usually writes it carburize. Although less visible than forging or casting, carburising is an important example of how controlled heat and chemistry can change a material’s properties without altering its overall shape. In workshop and engineering contexts, the word is understood as a precise heat-treatment term rather than as a general synonym for browning or firing.
verbTo cause a material, especially steel, to take up carbon by heating it in contact with carbon or a carbon-rich atmosphere, typically allowing carbon to penetrate the surface.
- To give a metal, especially steel, a carbon-enriched surface by heating it in contact with carbon or a carbonaceous atmosphere.
"The workshop carburised the steel before machining it to improve its wear resistance."
"The manufacturer carburised the gears to produce a hard, wear-resistant exterior."
"In foundry work, the components may be carburised in a controlled atmosphere before final heat treatment."
Carburise gives steel a carbon-rich skin without turning the whole component into carbon.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does carburise come from?
The verb was formed in English during the 19th century from "carbon" and the verb-forming suffix "-ize", with the British spelling "-ise" becoming standard in British usage. "Carbon" comes through French from Latin "carbo", meaning coal or charcoal. Related words such as "carbonate", "carbonic", and "carburetor" reflect this same Latin root.
Related word forms
How carburise is actually used
This is primarily a technical and formal term associated with metallurgy and heat treatment. British English generally uses "carburise", while American English usually uses "carburize".
Easily confused with carburise
Carburising adds carbon to the surface of a metal, whereas carbonising broadly refers to converting a substance into carbon or char.