1. Categorize by use
General mechanical forgings
Shaft: gear shaft, piston rod, rod shaft, drive shaft, shaft gear, shaft and so on.
Gear class: gear ring, spline teeth, transmission gear, heavy machinery gear, sun wheel, planet wheel, etc.
Connecting rod class:
Connecting rod, engine connecting rod, hydraulic cylinder connecting rod, etc.
Flange/Disk type:
Ring parts, rolling rings, flanges, flanges, cylinder heads, etc.
Automobile forging:
Steering knuckle, front shaft, half shaft, transmission synchronizer, clutch parts, etc.
Energy equipment forgings:
Wind power slewing support, gear ring, wind power spindle, nuclear power pressure vessel, nuclear power nut, bridge nut, etc.
Railway forgings:
Nuts, lugs, couplings, wheels, brake system components, etc.

2. Sort by material
Carbon steel/alloy steel forgings: such as SAE8620, 4140, 4143, 1.227, 18CrNiMo-6, 16MnCr5, 35MnCr5.
Stainless steel forgings: such as 304, 316, 2Cr13.
Non-ferrous metal forgings: aluminum alloy, copper alloy, titanium alloy.

3. Classification by forging process
Free forging: large, single or small batch production (such as hydroelectric spindle).
Die forging: mass production, complex shape (such as cylinder bottom).
Precision forgings: near-net forming to reduce machining allowance (e.g. gear blank).

4. Classification by processing state
Roughing forgings: Further turning/milling required.
Finishing forgings: direct assembly use.
Gear/ring: used for finished product assembly.

5. Special function forgings
High pressure valve forgings: petrochemical pipeline systems.
Wear-resistant forgings: shovel teeth, crusher parts of mining machinery.

Because of its high strength, fatigue resistance and other characteristics, forgings are the key basic parts of high-end equipment manufacturing, and the technical trend is to lightweight and precision development