Process	Carbonising
	Carbonising provides wear parts (gearwheels, shafts, screws), shock-resistant or form steels with good slide properties. It is suitable for surfaces subject to high loads and strokes, and unsuitable for tools because it increases their brittelness. At a temperature ranging from 800 to 950 C, carbon is inserted (diffused) into the substrate surface. The depth of insertion depends on the temperature, the time at temperature, and the carbonising mean (gas, salt bath, powder.) The primary hardness is obtained by following hardening or tempering of the superficial layer in a water solution. Used exclusively with plain or low alloyed carbon steel. Selective carbonising is also possible.
Danish Name	Karburering (kulstoindsætning)
Category	Surface treatments, Thermal diffusion processes
Materials	Substrate: Steel (low, medium cost) Carbon (diffusion material)
	Process type Plant cost (M DKK) Productivity (Kg/h) Variable cost (DKK/Kg) Gas diffusion 5 120 1.25 Medium (bottles 500-1000 ml) 230 3 0.5 Large (Thermos) 240 7 3
Price date	October 1996
Environmen- tal notes	The salt bath version uses poisonous salts and has other environmental problems.
Additional info	Gas-insertion requires high investments. Salt bath and powder-insertion require lower investments.
Photo	Thomas Nissen (Computer graphics)
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