Nitriding

The goal of the treatment is to enrich the surface layer of components with nitrogen (nitriding) or nitrogen and carbon (carbonitriding) to achieve a high resistance to wear and a certain resistance to corrosion.
A wear-resistant compound layer consisting of iron nitrides typically forms on the surface. In the diffusion zone beneath this layer, special nitrides that result from the combination of nitrogen with alloying elements serve to increase the hardness and bending strength. The core of the component, which is not enriched with nitrogen, maintains the strength and ductility of the pre-hardened material.
To this end, the material being treated is exposed during nitriding to a nitrogen-emitting or nitrogen- and carbon-emitting atmosphere at temperatures between 500 and 600°C for a defined period of time, which may be up to over 100 hours depending on the nitriding depth. Due to the set concentration gradients between the atmosphere of the furnace and the steel/component, the nitrogen/carbon penetrates into the surface of the component and diffuses into the inside of the workpiece.

Features

Nitriding

Very low-distortion heat treatment

Low treatment temperatures prevent structural transformations and therefore delays caused by structural transformations following heat treatment

Special nitrides in the surface result in an increased tempering resistance up to approx. 400 °C

Use of components treated with this method at higher temperatures

Compound layer decreases coefficient of friction considerably and increases corrosion resistance

Other products

Hardening shop

Case hardening

Hardening refers to the sub-process in which the material being treated is quenched in oil or under gas following carburization.

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Hardening shop

Annealing

Annealing processes are intensive heat treatments. The goal is to obtain specific material properties that are suitable for subsequent processing steps.

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Hardening shop

Quenching

Heat treatment consists of raising the austenitizing temperature followed by quenching that is appropriate for the material and the required properties.

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Hardening shop

Material testing

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Surface coating

RENK has many years of in-depth experience in the area of surface coatings for gear unit parts and drive components which are subject to exceptional conditions.

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Gear technology

Optimized design and production of gears at RENK. Ideal operating characteristics and a high degree of reliability.

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Heat treatment

Heat treatment from RENK. Thorough and reliable heat treatment for gear unit parts and drive components.

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