21st August, 2017

Processes - Carburising

Gas carburising is a surface-hardening process which is carried out at a high temperature - usually above 925°C. The process is usually conducted in a sealed quench furnace in which a carburising gas is introduced. Atomic carbon is generated by the reaction between the gaseous furnace atmosphere and the steel. The carbon diffuses into the metal surface usually to a depth between 1 and 3mm. After carburising the hardness of the carbon enriched surface is developed by quenching, usually in oil. Hardness values typically in the range 58 - 63 HRC are developed in the carburised surface.

Significant investment through the purchase of four British Furnace sealed quenches, two Ipsen sealed quenches along with complimentary tempering and washing facilities has seen Metaltech evolve into one of the largest controlled atmosphere heat traders in the UK. Carburising is conducted under high process control using Marathon Monitors and Eurotherm carbon atmosphere control systems to regulate carbon flow into the furnace atmosphere. Both nitrogen / methanol and endothermic atmosphere generation systems are employed to produce the carburising atmosphere.

Production is orientated around a 24 hour basis shift system. A shot blasting facility is also available (if required) to remove any discolouration, carbon stop-off paints etc that may be present as a result of processing.


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