What is the typical hardness requirement for heat treatment of ZLY gear reducers

The hardness requirements for gear reducers after heat treatment vary depending on factors such as gear material, heat treatment process, and specific operating conditions. Here are some common situations:

Surface quenched gears: The commonly used material is steel with a carbon mass fraction of about 0.35% to 0.5%, and the tooth surface hardness can reach 45~55HRC.

Carburized and quenched gears: Alloy steel with a mass fraction of 0.2% to 0.3% carbon before carburization is commonly used, and its tooth surface hardness is usually in the range of 58~62HRC. The hardness of the tooth center is generally 310~330HBW.

Tempered gears: After tempering treatment, the hardness of the tooth surface is usually between 180-250HV (Vickers hardness), which is equivalent to a Brinell hardness of about 160-230HSS.

Nitrogen carbon co diffusion gear: After nitrogen carbon co diffusion, the hardness of the tooth surface is usually between 400-600HV, which is equivalent to a Rockwell hardness of about 40-55HRC.

Soft tooth gear: Straight tooth gears are usually treated with quenching and tempering, with a hardness range of 240-330HSS. Diagonal and herringbone gears can be quenched and tempered or normalized, with a hardness of 240-300HBS for small gears and 160-260HSS for large gears.

Medium hard gear: with a hardness between HRC30-45, materials such as 42CrMo can be selected and subjected to quenching and tempering treatment to obtain better strength and toughness.