Manufacturing process

Forging

Forging shapes heated or cold metal under compressive force, producing parts with continuous grain flow that are commonly chosen where strength, toughness and fatigue resistance matter.

Process overview

Forging shapes metal through controlled compressive forces to produce components with favorable grain flow and mechanical performance. It is commonly considered for structural, load-bearing and safety-critical parts where strength and fatigue resistance matter. Requirements may include alloy grade, forging method, heat treatment, machining allowances, testing and dimensional inspection.

In closed-die (impression-die) forging, a heated billet is pressed or hammered between shaped dies, usually in several stages, to produce near-net-shape parts such as crankshafts, connecting rods and flanges. Open-die forging works the metal between flat or simple dies and suits large shafts, blocks, discs and low quantities. Ring rolling produces seamless rings for bearings, gears and flanges, and cold forging forms smaller parts at room temperature with good surface finish and consistency.

Compared with machining from bar or casting, forging aligns the grain along the part contour and closes internal voids, which is why it is widely used for load-bearing and safety-relevant components. The trade-off is tooling: closed-die forging needs dedicated dies and becomes economical at medium to high volumes, whereas open-die forging needs little part-specific tooling.

Forgings usually go through heat treatment — normalising or quench and temper — and are finish-machined on functional surfaces. Depending on the application, testing covers hardness, mechanical properties from test pieces and ultrasonic inspection.

Typical capabilities & what manufacturers can produce

What manufacturers can produce

  • Crankshafts, connecting rods, axles and steering parts
  • Flanges, fittings and valve bodies
  • Gear blanks, hubs, yokes and couplings
  • Seamless rolled rings
  • Large open-die forged shafts, blocks and discs
  • Cold-forged fasteners and small precision parts

Capabilities under this process

Suitable materials

Materials commonly used with this process — an editorial reference, not a statement about facilities in the Metraxio network. Suitability always depends on the part and its application.

Relevant industries

Industries whose Metraxio industry guides list Forging as a common process, with the typical use in each.

What buyers should specify

The details that make Forging quotes comparable and let facilities be assessed on the right criteria.

Finished part drawing
Plus a forging drawing if available; otherwise the forger proposes the forging geometry and allowances.
Material grade
For example 42CrMo4, C45 or 1.4404, with the governing standard.
Heat treatment and properties
Delivery condition (normalised, quenched and tempered), hardness range, tensile and impact values.
Forging route
Closed-die, open-die or ring rolling, if already decided.
Forged weight and quantity
Weight per part and annual volume — they decide whether die investment pays off.
Testing
Ultrasonic or magnetic particle testing, hardness, macro-etch for grain flow, test coupon location.
Certificates
EN 10204 3.1 or 3.2 and heat-number traceability.

On Metraxio these details become a structured manufacturing requirement. Processes, capabilities, materials, certifications and part size are checked against facility profiles; tolerances, finishes and inspection details travel with your drawings and are reviewed during quoting rather than used as automatic filters.

Frequently asked questions

Why forge instead of machining from bar?

For many shapes forging uses less material and gives a grain flow that follows the part contour, which can improve fatigue performance. For low quantities or simple shapes, machining from bar may still be more economical.

Open-die or closed-die forging?

Open-die forging suits large parts and small quantities with minimal tooling. Closed-die forging produces near-net shapes with dedicated dies and suits repeat volumes.

Are forgings delivered machined?

It depends on the supplier and the order. Many forgers offer rough or finish machining in-house or through partners, so the delivery condition should be stated in the requirement.

Forging by country

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