Forging Ingots for Shafts and Crankshafts
Large shafts and crankshafts are open-die forged from ingots, then heat treated and machined. They carry fatigue loads, so internal soundness and cleanliness matter more than surface finish.
Forging ingots for shaft manufacturing are cast in marks from M3 to M22 to suit long and heavy shafts, in carbon and alloy grades.
Typical components
- Marine and industrial crankshafts
- Rotor and turbine shafts
- Axles
- Pump and compressor shafts
- Gear shafts
Recommended steel grades
EN19
A widely used chrome-moly steel with good hardenability, toughness and fatigue strength in the quenched and tempered condition.
EN24
A high strength, deep hardening steel with very good toughness, used where heavy sections must harden right through.
SAE 4140
The American-designation counterpart of EN19 and 42CrMo4. Strong, tough and easy to heat treat.
SAE 4340
A tough, high strength steel with excellent hardenability. Often chosen for heavy-duty, shock-loaded parts.
42CrMo4
The EN 10083 designation of the 4140 / EN19 family, widely specified for European and export orders.
Choosing the ingot
Long shafts need a tall, sound ingot and sufficient forging reduction. Tell us the finished diameter and length, and we can suggest the ingot mark and the reduction available.
Check the ingot size chart for available marks and weights, and read how to choose the right ingot size using the forging reduction ratio.