Nitriding and quenching is the method of making nitrogen diffusion and solid solution in the austenite zone of the Fe-N phase transformation diagram, after that it is quenched for transforming to high hard martensite obtained nitrogen. In the nitriding and quenching, the nitrogen-diffusing zone becomes nitrogen martensite, which is high hardness by quenching. However, the inside does not harden because it is quenched from below the transformation temperature of the Fe-C diagram.

Clutch plate, Spool, Bearing holder, Thrust washer, Knitting machine parts, Various fine blanking parts