Using nitrogen-containing/carbon gases (such as ammonia, acetylene, etc.) as nitriding/carburizing media, under heating conditions, nitrogen-containing/carbon gases decompose to produce active nitrogen/carbon atoms that adsorb on the surface of stainless steel workpieces and diffuse inward to form a chemical heat treatment process that changes the chemical composition and structure of the workpiece surface, forming a carburizing nitrogen/carburizing layer. It can effectively improve the hardness, wear resistance, fatigue strength, and bite resistance of stainless steel surfaces.

Advantages

Low temperature gas nitriding/carburizing of stainless steel is carried out at a lower temperature, generally 400-450 ℃, which is lower than traditional gas nitriding/carburizing temperature. The workpiece deformation is small, and the lower reaction temperature can effectively reduce the reaction and precipitation of chromium on the surface of stainless steel. It can achieve excellent hardness and wear resistance on the surface while maintaining the original corrosion resistance without reducing it.

NITRIDING OF STAINLESS STEEL

On this market, many customers are looking for the qualified nitriding process for stainless steel parts. As a result of many factors, several commercial heat treaters stated their capabilities to provide this service, but usually were not satisfied by the customers in terms of uniformity, and reliability.

Nitriding of stainless steel has been supposed as niche process and curiously requested by many customers. SAMT is going to provide the qualified process to this market by our thermal processing service by either the independent or the cooperative with commercial heat treater.

The rules applying to nitriding of stainless steel or refractory alloys are no different than those for the other groups of steels, with one exception. The exception is the proprietary de-passivation stage that allows for a removal of oxides of alloying elements such as Cr, Ni and others which, if not removed, will effectively block the nitriding process. The same way they block the rust formation on the stainless steel surface.

All types of stainless steel can be nitrided. The martensitic, austenitic or PH materials are inclusive.

Low-temp Gas Nitriding / Nitrocarburizing for SST

Shenlizing - SST