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What is the difference between carburising and nitriding treatments ?



What is the difference between carburising and nitriding treatments ? Give the one example of component for which each process is suitable.



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Carburizing and Nitriding, both are Heat treatment processes used for ' surface hardening' of  the low carbon steels (especially) and also low alloy steels, medium and high carbon steels. 

The main difference is, in Carburizing Carbon is made to diffuse through the metal surfaces whereas in Nitriding, Nitrogen is made to diffuse.

 Application :

Carburizing is applied to low-carbon metals, and metals that  are in contact with a high-carbon gas, liquid or solid, gearscrankshafts, camshafts 

Typical applications of Nitriding include gearscrankshafts, camshafts, cam followers, valve parts, injectors, firearm equipments.

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Carburizing  is a heat treatment process in which iron or steel absorbs carbon liberated when the metal is heated in the presence of a carbon bearing material, such as charcoal or carbon monoxide, with the intent of making the metal harder.

Example - precision gears


Nitriding is a heat treating process that diffuses nitrogen into the surface of a metal to create a case hardened surface. These processes are most commonly used on low-carbon, low-alloy steels, however they are also used on medium and high-carbon steels, titanium, aluminum and molybdenum

example: crankshafts

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Nitirding does not cause smash or rift or any change in metal properties because it is not need to sprinkle to get surface hardening and also it doesn't need to high temperatures such as Carburizing.

Edited by Omar Eyad

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