1. For high-strength powder metallurgy gear products, it should have high density and adopt the process of "pressing - pre-firing - refiring - heat treatment".

2. The lower carbon content can ensure that the product has high surface hardness and wear resistance during heat treatment, and the low carbon in the core will make the product have good impact resistance.

3. Adding 2%-3% Ni and 2% Cu to the material can significantly improve the willfulness and impact strength of the material after sintering.

4. Compared with carburizing and quenching, carbonitriding has good wear resistance, and the lower carbonitriding temperature ensures the strength of the core of the part and reduces the quenching deformation of the part.

Powder metallurgy gears, as powder metallurgy parts commonly used in automobile engines, can fully meet the requirements of gear accuracy and effectively improve processing efficiency through one-time forming and finishing process without other post-processing.