Alloy steel is mainly composed of materials other than carbon and iron plus alloy elements, such as copper, manganese, aluminum, titanium, rare earth and other materials.

Alloy steel is an important material for the social and economic development in China. In recent years, the output of alloy steel in China has shown a growth trend.

Gear quenching is the main link that causes distortion. The basic method to control quenching distortion is to make all parts of the gear cool evenly as far as possible.

The forging methods of shaft forgings can be divided into free forging, upsetting, extruding, die forging, closed test die forging and closed test upsetting according to the movement method of the blank.