Open Die Forging — Large Custom Forgings & Pre-Forms

Open die forging shapes large metal workpieces between flat or simple dies, giving you big parts and pre-forms that would be impossible or uneconomical in a closed die. It is the right route for low volumes, large sizes and high-quality starting stock.

What Open Die Forging Is For

Open die forging works the metal in steps between simple dies, so it handles large sizes and low volumes without the cost of a shaped die. It refines the grain structure and heals internal voids, producing sound material for critical shafts, blocks and discs.

Parameter	Typical capability
Materials	Carbon steel, alloy steel (42CrMo/4140, 40CrNiMo), stainless, tool steel
Part weight	up to 5,000 kg
Geometry	Shafts, bars, blocks, discs, rings, stepped pre-forms
Key advantage	Large sizes, low volume, no shaped die required

Typical Products

Large shafts and spindles
Rolls and cylinders
Blocks and slabs for machining
Discs and hubs
Pre-forms for further closed-die or machining work

Inspection & Documents

Material certificate (spectrometry)
Ultrasonic testing for internal soundness
Mechanical property and hardness tests
Dimensional report

Lead Time & MOQ

Sample: 25–40 天
Production: 30–60 天
MOQ: 1–10 pcs — low-volume friendly

FAQ

What is the difference between open die and closed die forging?

Open die forging shapes the metal between simple flat dies in steps, so it suits large, low-volume parts with no shaped die. Closed die forging uses a shaped die for higher-volume, near-net parts. We do both and will recommend the right one.

Can you make a single large forging?

Yes — open die forging is ideal for one-offs and small runs of large parts. Send the drawing and we confirm size and schedule.

Do you machine large forgings?

Yes, machining and heat treatment are available in-house or through vetted partners for large parts.

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