Precision parts processing: cyaniding of surface hardening
Cyaniding, sometimes called liquid carbon nitrogen co-seepage, is also a process combining carbon absorption and nitrogen absorption to obtain surface hardness, which is mainly used for low carbon steel which is not suitable for general heat treatment. Parts requiring surface hardening are immersed in sodium cyanide solution melted slightly higher than AC1 temperature, and the duration of immersion depends on the depth of the hardening layer. Then quench the parts in water or oil. By this treatment, the hardening depth of 0.005 to 0.015 inch (0.13-0.38mm) can be easily obtained. Cyaniding is mainly used to deal with small parts.