... .2, Different kinds of gears, worm gears3, Standard and non-standard4, Material C45, 40Cr. 42CrMo. GG25,GGG40 ... modal is between 1.5~104) Processing: precision hot and cold forging, precision machining and roll forming5) Heat treatment: annealing, normalizing, ... carbonitriding, carburizing, tempering6) Precision shot peen gear faces and roots to increase load capacity7) Standard: ISO, GB, JIS ...