Commonly used materials and heat treatment methods for gear parts（1）

May. 22, 2024

One. Basic requirements for gear materials

1. The tooth surface must be hard and the tooth core must be tough.

2. Easy to process and heat treat

3. Sufficient bending under alternating loads and impact loads

Two. Commonly used materials and heat treatment methods

No.	Gear type	Steel	Heat treatment
1	Automotive transmission and differential gears	20CrMo20CrMnTi	Carburizing
1	Automotive transmission and differential gears	40Cr	Carbonitriding
2	Automobile drive axle driving and driven cylindrical and bevel gears, differential planetary and side gears	20CrM0，20CrMnTi， 20CrMnMo，20SiMnVB	Carburizing
3	Car starter motor gear	20Cr，20CrMo， 20CrMnTi	Carburizing
4	Automobile crankshaft timing gear	40，45，40Cr	Hardening and high temperature tempering
5	Automobile crankshaft timing gear	20	Carbonitriding
6	Tractor transmission gears, cylindrical gears and shaft gears in power transmission devices	20Cr，20CrMo，20CrMnTi，20CrMnMo, 20SiMnNB	Carburizing
7	Tractor crankshaft timing gear, camshaft gear, hydraulic pump drive gear	45	Hardening and high temperature tempering
8	Automobile and tractor hydraulic pump gears	40,45	Hardening and high temperature tempering

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