Quenching in salt mixtures applied on automatic modular heat treatment lines: constraints, technical solutions and practical examples

Zimmermann Daniel - CODERE (Switzerland)

The quenching process in salt mixtures applied on modern and automatic heat treatment lines leads to many advantages due to his chemical composition and high calorific exchanges with the possibility to be used on a large range of quenching temperatures.

His applying field allows classical martensitic quenching processes on structural and tool steels with improvement of the mechanical properties and minimizing of distortions of parts, but constitute more and more the exclusive industrial solution for austempering treatments that asks about drastic requirements of homogeneity and cooling exchanges on quenching medium: example for bearing steels and ADI components..

Due to his modular installations with physical separation between high temperature furnace and quenching tank, CODERE propose the possibility to austenize under protective (endo) gas, transfer and direct quenching of the load without temperature losses and contact of air while respecting all environmental norms.

Our treatment lines follow all the constraints required for these applications: working in clean and safe conditions: austenizing (or carburizing) without pollution of salt; dimensioning and design of quenching tank with various possibilities; salt is eliminated during washing process and recycled after salt recovering device.

This presentation will show practical applications with loads from any kilogram’s to 10 tons weight with final results on mechanical properties and distortions’ comparisons with oil, as well as the potential of development and evolution of our technology associated on this quenching process.

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