gear types：Spur gear, helical gear, herringbone gear, internal gear, rack, bevel gear 。

Material Introduction：

1.Carbon steel: such as 45 steel and 40Cr steel, with high strength, good toughness and moderate price, is suitable for general mechanical transmission gears.

2.Alloy steel: such as 20CrMnTi, 20CrMo and 18CrNiMo7-6, with higher hardness and wear resistance, is suitable for high-load and high-speed gear transmission.

3.Carburized steel: such as 20Cr, 20CrMnTi and 18Cr2Ni4WA, with high surface hardness and good core toughness, is suitable for high-strength and high-precision gears.

4.Quenched and tempered steel: such as 35CrMo and 42CrMo, after quenching and tempering treatment, has high strength and toughness, and is suitable for gears that bear large impact loads.