Where Agricultural Machinery Sprockets Work  

Field-duty powertrain components:  

- Combine drives (header, feeder, threshing cylinder)  

- Tractor PTO take-offs  

- Planter/ trans planter seed-metering drives  

- Pivot & linear irrigation systems  

- Feed-grinder & mixer line shafts   

All run in dust, crop residue, shock loads and seasonal overloads—exactly the fatigue plus abrasion window where material choice decides service life. 

ADI Cast Edge  

Austempered Ductile Iron (ADI) is conventional ductile iron put through an austempering heat cycle:  

- Matrix turns to acicular ferrite + high-carbon austenite → strength 1 200-1 600 MPa, hardness 45-48 HRC, yet 5-10 % elongation remains.  

- Graphite nodules stay intact—built-in lube pockets that cut wear and damp vibration.  

- Density 7.1 g cm-³ vs 7.8 g cm-³ steel → lighter sprocket, lower rotating inertia.  

- Cast-to-shape keeps machining minutes low; total part cost down 20-40 % against forged-steel equivalents.   

Bottom line: higher torque capacity, longer abrasion life, quieter mesh, lighter package.

ADI QTD1400 (GB/T 24733-2023) Material Properties: