Radical Nitriding

Radical Nitriding Equipment


A radical nitriding system is configured of a furnace (vacuum-resistant, heat-resistant container), an electric heater, a vacuum evacuation device, a gas supply device, plasma and heater power supplies, an operation and control device and an exhaust gas processor.


All the operations are performed fully automatically according to the preset program. An abnormality during the operation is immediately handled according to the situation.


feature1Since gas ions are not used during heating, countermeasures to arc discharges during heating and localized discharges are easy.

feature2Uniform heating by use of the electric heater improves the temperature distribution during the processing and easily achieves the uniform processing temperature.

feature3High-quality processing can be achieved by precisely setting the optimal nitriding conditions for each grade of steel. It is also possible to create compound layers with the nitriding process. (However, the finishing will be the same as for ion nitriding.)


Radical nitriding equipment standards


ModelEffective dimension
Processing quantity
Proocessing temperature
JRN-4040VS 400×400 50 450~550
JRN-6060VS 600×600 300 450~550
JRN-8565VS 850×650 500 450~550
JRN-100150VS 1000×1500 1500 450~550


ModelHeater output
Input power
JRN-4040VS 18 42
JRN-6060VS 60 77
JRN-8565VS 80 100
JRN-100150VS 88.8 130

※Specification may be revised without notice as improvements are made.





Radical Nitriding Method

Ion Nitriding Method

Unlike conventional nitriding methods, like gas nitriding, with radical nitriding it is possible to perform the processing without forming a compound layer. This is a plasma surface processing method based on new concept.
In radical nitriding, conditions like the gas flow, processing pressure and plasma output are controlled with high precision, and the nitriding is performed with a suitable radical having a high nitriding effect. By controlling the quantities of ions and radicals generated during the nitriding process, it is possible to perform the nitriding while suppressing the formation of compound layers.


feature1The occurrence of heat cracks and defects of the edges that arise on dies and tools due to the compound layers can be improved. Furthermore, there is no distortion or dimension changes due to a compound layer.

feature2The optimal nitriding conditions can be selected for each type of material and part shape; and masking is easy.

feature3The post-processed surface condition is excellent, with negligible surface roughness.

feature4For composite processing, like PVD, it is possible to mitigate the large differences in hardness between the product surface and the hard coating and further enhance the PVD processing effect.

Microstructures after radical nitriding

Microstructures after radical nitriding

Hardness profiles after radical nitriding

Hardness profiles after radical nitriding



Head office


3-14-7 Chuo, Chuo-ku, Sagamihara-shi, Kanagawa


Sagamihara Factory


3-10-14 Miyashimo, Chuo-ku, Sagamihara-shi, Kanagawa


Nagoya Factory


12 Kakeshita, Kutsukake-cho, Toyoake-shi, Aichi


Osaka Factory


1-2-56 Nonakakita, Yodogawa-ku, Osaka-shi, Osaka


Toyonaka Factory


3-13-1 Tokura, Toyonaka-shi, Osaka