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Carbonitriding is an austenitic casehardening process (above A3), with the addition of nitrogen (via NH3 gas), used to increase wear resistance and surface hardness through the formation of a hardened surface layer.
Carbonitriding is mainly used to obtain a hard, wear-resistant layer. The spread of carbon and nitrogen increases the hardenability of carbon and low-alloy steels. The carbonitriding process is particularly suitable for the treatment of small components. Deformation is reduced due to the lower temperature used for the above treatment compared to the case-hardening process. Carbonitriding improves the wear and fatigue resistance of carbon and low-alloy steels.
Carbonitriding can be used to treat a wide variety of steels, from low-alloy carbon steels with up to 0.25% carbon to steels with high machinability and sintered components.
CONTROLLED ATMOSPHERE CARBURIZING:
Carburizing is a process that releases carbon into a solid ferrous alloy. This is achieved by heating the metal in a carbon-rich atmosphere for a predetermined time.
After carburizing, the parts are hardened and stretched in order to obtain a hardness from the surface layer to the core.
This is a surface hardening process used for low-carbon steels.
Carburizing and hardening produce hard, wear-resistant surfaces, and combining them with a relatively hard but tough core is an excellent combination to withstand wear and mechanical stress.
The depths of the carburized layers can vary from a few hundredths of a millimetre to several millimetres.
Carburizing is frequently used in the automotive, mechanical, hydraulic and textile machinery sectors.
This is a heat treatment process for ferrous metals with medium-high carbon content used to obtain a metallurgical structure called bainitic, which provides greater resistance and less deformation.
This low-temperature heat treatment is generally used after a hardening process to obtain the right hardness-to-tenacity ratio.
This surface hardening process increases wear resistance, surface hardness and fatigue hardness by means of a hardened surface layer while keeping the microstructure of the core unchanged.