Process for tufftriding amino gas

Abstract

The invention provides a process for tufftriding amino gas. The process comprises a heating treatment process before steel workpiece tufftriding treatment, a surface pre-treatment process, a tufftriding treatment process and a tufftriding subsequent treatment process, wherein in the heating treatment process, normalizing treatment and tempering and hardening treatment are adopted; in the tufftriding treatment process, ammonia, nitrogen and carbon dioxide are adopted as nitriding mediums, each tufftriding process parameter is reasonably controlled, a relatively low heating and cooling speed is adopted for a nitriding furnace, a certain amount of nitrogen is continuously introduced after the tufftriding process is completed to maintain the positive pressure atmosphere of the nitriding furnace, and the nitriding furnace is instantly cooled with water when the temperature of the nitriding furnace is reduced to 200 DEG C until the surface temperature of the steel workpiece reaches room temperature. By adopting the scheme, the process for tufftriding amino gas has the advantages of improving the hardness of steel workpieces and leading uniformity of hardness and an infiltrated layer to rise and the infiltrated layer to be deep.

Description

technical field [0001] The invention relates to a soft nitriding process, in particular to an amino gas soft nitriding process. Background technique [0002] Soft nitriding is a surface treatment process that is mainly based on nitrogen infiltration and also has C infiltration. Soft nitriding has the advantages of low treatment temperature, short time, small deformation of the workpiece, and is not limited by steel types, so it can significantly improve the hardness of the workpiece. The advantages of fatigue strength, wear resistance and corrosion are widely used in the treatment of wear-resistant workpieces such as molds, measuring tools, and cutting tools. However, the existing soft nitriding process often has low hardness of the workpiece, uneven hardness and infiltration layer, Therefore, it is necessary to find an optimized soft nitriding process to avoid the above defects as much as possible. Contents of the invention [0003] The purpose of the present invention ...

AI Technical Summary

Problems solved by technology

[0002] Soft nitrocarburizing is a surface treatment process that mainly includes N infiltration and C infiltration. Soft nitriding has the advantages of low treatment temperature, short time, The deformation of the workpiece is small, not limited by the steel type, and can significantly improve the fatigue strength, wear resistance and corrosion of the workpiece. It is widely used in the treatment of wear-resistant workpieces such as molds, measuring tools, and knives. The process often has defects such as low workpiece hardness, uneven hardness and infiltrated layer, and shallow infiltrated layer. Therefore, it is necessary to seek an optimized soft nitriding process to avoid the above defects as much as possible.