Abstract
A novel low temperature carburising approach for austenitic stainless steels, the NV Pionite process, is described. The formation of a metal fluoride layer on the surface before carburising allows carbon to be introduced into the workpiece by gas carburising at 450-500° C. Laboratory trials using 316 have been conducted. A single phase expanded austenite diffusion layer with surface microhardness of 810 HV0.05 and good corrosion properties is produced.
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