Case hardening

The goal of case hardening is to enrich the surface layer of low-carbon case-hardening steels with carbon up to a defined depth so that surface layer properties such as a high degree of hardness, compression strength, and resistance to wear are obtained following hardening. The core of the component, which is not enriched with carbon during hardening, obtains a structure that is highly ductile and resistant to bending with a comparatively low degree of hardness due to its low carbon content. This results in an increased bending resistance of the component.

Case hardening is a thermochemical process that consists of a number of sub-processes: Carburizing, hardening, and relaxing. During carburizing, the material being treated is exposed to a carbon-emitting atmosphere at temperatures between 850 °C and 950 °C for a defined period of time, which may be up to over 100 hours depending on the carburizing depth. Due to the set concentration gradient of carbon between the atmosphere of the furnace and the component, the carbon penetrates into the surface of the component and diffuses into the inside of the workpiece. Hardening refers to the sub-process in which the material being treated is quenched following carburization – typically in oil, depending on the material.

During the subsequent tempering and relaxing process, the desired surface hardness is established by warming the material again.

Features

Case hardening

Superior standard of quality thanks to a high degree of automation, which ensures the reproducibility of the heat treatment processes

Computer-assisted heat treatment processes

Process monitoring and documentation is carried out using the process control computer.

Monitoring of the atmosphere at regular intervals by burning foil

Lab examines heat treatment results, such as CHD, hardness, structure, etc.

Documentation of the results in the form of certificates or attestations if desired

Other products

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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Job order production

Hardening and tempering

Hardening and tempering is an end-to-end heat treatment process for components and is used to achieve a specified component hardness that is suitable for the intended use.

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Hardening shop

Nitriding

The surface layer of components is enriched with carbon and/or nitrogen to obtain a high degree of resistance to wear and corrosion.

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Hardening shop

Material testing

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Relevant areas of expertise

Areas of expertise

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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Areas of expertise

Gear technology

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

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Areas of expertise

Heat treatment

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

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