Method for nitriding a steel

Abstract

A nitriding method for a secondary hardening steel part, the method including the following steps: obtaining a secondary hardening steel rough-machined part; surface carburizing the rough-machined part to obtain a carburized layer over a first thickness of the rough-machined part; austenitizing the carburized layer to obtain an austenitic steel layer; quenching the austenitic steel layer to obtain a martensitic steel layer; tempering the martensitic steel layer to obtain a tempered layer; grinding the tempered layer to obtain a ground tempered layer having a second thickness; surface cleaning the ground tempered layer to obtain a clean layer; surface decarburizing the clean layer in a nitriding furnace to obtain a decarburized layer on a third thickness, the third thickness being strictly less than the second thickness; surface nitriding the decarburized layer in the nitriding furnace to form a surface nitrided part.

Dependencies are inferred from the claim text.