Method for Steel Surface Hardening Treatment and an Apparatus Therefor

Author:  Naito et al.
Source:  US Patent 5,268,040
Doc ID:  1992072
Year of Publication:  1992
Abstract:  
A method of cooling steel parts from austenitic stage to a temperature that is higher than its Ms point after carburization of said steel part to carry out diffusion transformation, then carrying out a nitriding treatment and further applying shot peening, and in order to implement said method provide a carburizing zone, a cooling zone for carrying out diffusion transformation and a nitriding treatment zone connected through opening and shutting doors, and provide feeding devices in each of said zones to feed the steel parts to the next zone.