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One of the most important metallurgical processes is the case hardening or carburizing process. Parts are heated to 900 – 1000C and by adding specific gases (hydrocarbons) to the processing chamber, the part surface is enriched through carbon absorption.
Following this treatment the part is quenched in order to achieve the required metallurgical properties – which can result in higher resistance to stresses and friction on the component surface. The core of the part remains somewhat softer and more ductile which allows the part to carry higher stresses through its life. Gear parts for transmission are generally treated in this way.
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