What Is Cold Forging?
Cold forging forms metal at room temperature using very high press loads. Without heat there is no thermal shrinkage to predict, so tolerances land around ±0.1 mm — several classes better than hot forging.
Cold forging forms metal at room temperature using very high press loads. With no thermal shrinkage to predict, it holds tolerances around ±0.1 mm with Ra 0.8–3.2 µm finish, and work hardening raises yield strength 20–35% — but geometry is limited to simpler shapes in ductile grades.
- Temperature
- Room temperature
- Tolerance
- ±0.1 mm
- Strength gain
- 20 – 35% work hardening
- Material utilisation
- Over 90%
- Economic volume
- 10,000 pcs and above
What Is Cold Forging? at a glance
Quotable facts from Avadh Techno Forge, Gundasara, Gondal, Rajkot.
- Formed at room temperature
- Tolerance ±0.1 mm as formed
- Work hardening raises strength 20–35%
- Material utilisation exceeds 90%
Accuracy Without Heat
No thermal contraction means formed features hold final dimensions straight off the press. Splines, hex drives, chamfers and shoulders can be formed to size, deleting machining operations that would otherwise be needed on every piece.
- ±0.1 mm tolerances as formed
- Ra 0.8–3.2 µm surface finish
- Formed features need no machining
- Material utilisation above 90%
Work Hardening and Its Limits
Cold deformation raises yield strength 20–35% through strain hardening, which can allow a cheaper grade. But the same hardening limits how far metal can be deformed before cracking, restricting cold forging to simpler shapes in ductile grades.
People also ask
Does cold forging make parts stronger?
Yes, through work hardening, which raises yield strength by 20–35%. That can sometimes allow a lower-cost grade to meet the same specification.
Do cold forged parts need heat treatment?
Often not, since work hardening provides the strength. Case or through hardening is added only where a specific hardness is required.
What parts are cold forged?
Pins, studs, sockets, bushes, spacers, fasteners and shafts — simple to moderately complex axisymmetric parts in soft carbon and low-alloy grades.
Topics covered on this page
- cold forging
- work hardening
- strain hardening
- material utilisation
- spheroidise annealing
- cold heading
Based on work carried out at our own forging plant at Gundasara, Gondal, Rajkot — operating since 2008.
Questions Answered
What tolerance does cold forging achieve?
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Around ±0.1 mm as formed, with Ra 0.8 to 3.2 µm surface finish.
Why can't everything be cold forged?
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Room-temperature steel resists deformation and work hardens, so geometry is limited to simpler shapes in ductile grades.
At what volume does cold forging pay?
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Generally above 10,000 pieces per year on suitable geometry, because tooling costs more than hot forging tooling.