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Plasma nitriding - PLASNIT®


RUBIG’s PLASNIT® processes are the ultimate in nitriding technology. The MICROPULS® technology deve­loped by RUBIG is utilized in RUBIG systems to perform plasma nitriding processes in premium quality. PLASNIT® is an environ­mentally friendly option with improved corrosion properties that ensures highest reproducibility with narrow tolerances. A variety of PLASNIT® process types is available, and RUBIG’s special treatment PLASOX® is achieved through controlled post-oxidation. Inno­vations such as PLAPOL help continue to advance PLASNIT® treatments.

You are interested in our plasma nitriding pro­cesses?

Contact us.

The technological peak of the ­nitriding procedure

Plasma nitriding is the technological peak of the nitriding procedure and provides considerable advantages as compared to the salt bath and gas nitriding. Since plasma nitriding is normally performed at lower treat­ment temperatures, it is the heat treatment with the lowest risk of deformation. Due to the large variability of the process control, the steel charac­ter­istics, the customer demands and the restrictions posed by the re­spective pre-treatment can be con­sidered during plasma nit­riding in a very good manner. The nitriding cast depth, the surface hardness and the compound layer thickness can be well achieved over a broad range of the steels.

Benefits of PLASNIT® treatments for your components

  • Steels with low to high alloy content nitridable (incl. stainless steels)
  • Compact, dense and "more ductile" compound layers
  • Lower risk of deformation due to lower treatment temperature
  • Partial treatment by means of mechanical coverage possible
  • Paste can also be used for coverage
  • Good reproducibility and narrow tolerances in the treatment result
  • Fewer roughnesses and cleaner surfaces as compared to salt bath and gas
  • Increased corrosion protection of unalloyed and low-alloy steels
  • Possibility of post-oxidation
  • Environmental friendliness

RUBIG customers may choose from the following treatments:


Detailed descriptions of our pro­cedures are presented in our technical data sheets that are avai­lable for download

PLASNIT® Plasma nitriding

Under our brand name PLASNIT®, we offer our customers highly de­veloped plasma nitriding heat treatments for a wide range of steel types. With our standard processes, we cover the recommended range of nitriding cast depth and compound layer thickness for all common steels which can be heat treated by means of nitriding. A list with the most common steels/materials and their achievable values in our standard processes can be found here.  

Our strength is the individual de­velopment of plasma nitriding processes in order to comply with your requirements in respect to nitriding case depth, compound layer thickness, corrosion protection and oxide layer thickness - for in­dividual parts up to large scale production.   Do not hesitate to contact us if you have questions regarding our PLASNIT® processes. We will be pleased to advise you, whether regarding the steel se­lection or application-oriented surface treatment - we would be pleased to assist you.  


In order to be able to quickly per­form the plasma nitriding process or to advise you, we kindly ask you to provide us with the following information on the parts to be treated and the requirements:

  • Steel designation (material no., DIN designation)
  • Previous heat treatment (hard­ening process, tempering temperature, ...)
  • Required nitriding cast depth in mm
  • Required surface hardness in Vickers hardness
  • Required thickness of the compound layer
  • As the case may be, specification of the areas which shall not be nitrided and possible stand space 


PLASOX® is the abbreviation for plasma and oxidation and refers to our PLASNIT® processes with subsequent oxidation.

With this targeted post-oxidation, an oxide layer is embedded in the compound layer which results in an improvement of the slip charact­eristics and the corrosion resistance. This combination of plasma nitriding and post-oxidation can be per­formed in one process or in two individual processes.

Due to the PLASOX® treatment, the components become dark grey to matt black. We recommend our PLASOX® treatment for com­pon­ents which require a certain cor­rosion protection and act as a friction partner for another hardened part.


Our PLAPOL layer is introduced into the surface by means of a diffusion process at low temperatures. The objective is (similar to nitriding) to embed atoms in the matrix of the steel without formation of com­pounds (e.g. nitride or the formation of a compound layer).

Thus, PLAPOL is ideally suited for tools made of tool steels whose tempering temperature is above 400°C (e.g. 1.2343, 1.2311, 1.2316, 1.2083). The PLAPOL layer with a diffusion thickness of 10-70 µm has a hardness exceeding 1,000 according to Vickers, a high resistance to wear and can be polished and is suited for repair welding.

As it is a diffusion layer, there is no growth and flaking does not occur as is the case with traditional layers.

Due to the low treatment tempera­ture, the risk of deformation is negligible. Due to the low harden­ing depth, we recommend the PLAPOL treatment only for quen­ched and tempered or harden­ed steels.

Technical Data

  • Maximum dimensions: Ø 1.500mmx2.400mm depth

More informations on request:[at]rubig[dot]com