5. Heat treatment after carburizing or carbonitriding
After carbon or carbon and nitrogen have been introduced to the surface, the case-hardened or carbonitrided part undergoes a heat treatment designed to give it its working properties. This generally involves hardening by quenching, followed by stress-relieving tempering at temperatures usually between 150 and 200°C, to maintain the layer's high hardness. Sometimes, these treatments are preceded by annealing to enable machining before hardening. Finally, cryogenic or sub-zero treatments are sometimes carried out after quenching to reduce residual austenite content and improve certain working characteristics.
5.1 Hardening by tempering
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Heat treatment after carburizing or carbonitriding
Pre-treatment preparations
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- Aciers de construction non alliés et alliés spéciaux pour cémentation. Nuances. Demi-produits, barres et fils machine. - NF A 35-551 - 7.86
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