Process Chromising
Chromising is used for all kind of steel parts subject to high temperatures (valves for internal combustion engines, forging and extrusion tools, etc.) The hardness obtained depends on the content of carbon of the substrate (> 0,6%, good hardness).

Long-time process with limited shape capability. After the treatment, the chromium content of the surface ranges between 13 and 30%.

Granulated chromising is the most used.
The chromising granulate (FeCr) is heated in an activating atmosphere (H2+HCl) at about 850 C. Following reactions insert chromium into the substrate surface.
Danish Name Kromering
Category Surface treatments, Thermal diffusion processes
Materials Steel (substrate)
Chromium (diffusion material)
Photo Thomas Nissen (Computer graphics)
Copyright © 1996-2003 Torben Lenau
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