CARBURISING
Carburising is a thermochemical process in which carbon is diffused into the surface of low carbon steels to increase the carbon content to sufficient levels so that the surface will respond to heat treatment and produce a hard, wear-resistant layer

All three processes rely on the transformation of austenite into martensite on quenching. The increase in carbon content at the surface must be high enough to give a martensitic layer with sufficient hardness, typically 700HV, to provide a wear-resistant surface. The required carbon content at the surface after diffusion is usually 0.8 to 1.0%C. These processes can be carried out on a wide range of plain carbon steels, alloy steels and cast irons where the bulk carbon content is a maximum of 0.4% and usually less than 0.25%. Incorrect heat treatment can lead to oxidation or de-carburisation. Although a relatively slow process, carburising can be used as a continuous process and is suitable for high volume, surface hardening.

Gas carburising
In gas carburising, the component is held in a furnace containing an atmosphere of methane or propane with a neutral carrier gas, usually a mixture of N2, CO, CO2, H2 and CH4. At the carburising temperature, methane (or propane) decomposes at the component surface to atomic carbon and hydrogen, with the carbon diffusing into the surface. The temperature is typically 925°C and carburising times range from 2 hours for a 1mm depth case to a maximum of around 36 hours for a 4mm case. The quenching medium is usually oil, but can be water, brine, caustic soda or polymer.

Liquid-carburizing-(orCyaniding)(We do not have this facility)
Solid (pack) carburizing (We do not have this facility)

 
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