Hot pressing
and processing of steels
Consists in a phase of heating and maintaining at high temperature followed by a rapid cooling with water (black finish which requires a subsequent pickling treatment) or inert gas (bright finish), designed to put back into solution (and therefore to avoid) the precipitates chromium carbides, which would otherwise have time to form in the case of a slower cooling. The chromium carbides are typically responsible for the intercrystalline corrosion.
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