首页>
外国专利>
Thermochemically treating steel part i.e. gear train that is used in gear box, comprises performing first thermochemical enrichment process in steel with carbon and a second thermochemical enrichment process in steel with nitrogen
Thermochemically treating steel part i.e. gear train that is used in gear box, comprises performing first thermochemical enrichment process in steel with carbon and a second thermochemical enrichment process in steel with nitrogen
The method comprises: performing a first thermochemical enrichment process in a steel part with carbon at specific temperature; performing a second thermochemical enrichment process in the steel part with nitrogen at specific temperature; performing the re-austenitization of the steel part; and hardening the steel part by inducing heat. The treated steel part is cooled to avoid oxide formation on a surface of the steel part. The first and second thermochemical enrichment processes are performed at 300-700[deg] C. The re-austenitization process is carried out under a controlled atmosphere. The method comprises: performing a first thermochemical enrichment process in a steel part with carbon at specific temperature; performing a second thermochemical enrichment process in the steel part with nitrogen at specific temperature; performing the re-austenitization of the steel part; and hardening the steel part by inducing heat. The treated steel part is cooled to avoid oxide formation on a surface of the steel part. The first and second thermochemical enrichment processes are performed at 300-700[deg] C. The re-austenitization process is carried out under a controlled atmosphere in the presence of inert gas, preferably in the presence of nitrogen gas. The steel is slightly alloyed steel including 0.1-0.3 wt.% of carbon, the first thermochemical enrichment process increases the content of carbon to 0.9 wt.%, and the second thermochemical enrichment process is carried out to increase the content of nitrogen to 15 wt.%. An independent claim is included for a steel mechanical component.
展开▼