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Open Die Forging | Where Can I Find the Best Open Die Forgings?

There are multiple types of forging processes. The two most common are open and closed die forging. While both share the same concept of using pressure and temperature, they differ in their use of dies to form the metal. Let’s take a deeper look at open die forging.

Open Die Forging

Open die forging is the process of deforming a piece of metal between multiple dies that do not completely enclose the material. It is often used for short-run forgings of parts that are simple in design. This can include discs, rings, sleeves, cylinders, and shafts. Products made via this process often need secondary machining and refining to achieve the tolerances required for the finished specifications. Custom shapes can also be produced with open die forging.

Industries That Use Open Die Forgings

Many industries utilize open die forgings. The agriculture, automotive, medical, industrial, consumer, aerospace, nautical, oil & gas, and military industries all use this process.

Where Can I Find the Best Open Die Forging?

Ferralloy is a major supplier of open die and closed die forgings to a global customer base. We have the ability to provide custom components as forged, rough machined, or finish machined to meet your exact specifications. Our forging services incorporate skillfully engineered processes, modern production equipment, and premium quality raw materials. We can supply forgings that range in weight from a few ounces up to more than 5,000 pounds. For more information about our forging capabilities, or to place an order, contact us today.


What is open die forging?

Forged Furnace Roll Trunnions

Ferralloy, Inc. began shipping an order for 120  furnace roll trunnions, or bell ends as they are sometimes referred to, for a new heat treating furnace ordered by a large international steel producer.

The requirement for forgings in this application is somewhat unusual as this component is typically supplied as a sand cast component. For reasons related to the inherent mechanical properties of a forging, we were asked if we could source the billet material in the desired chemistry, forge the trunnions, and rough  machine them to the drawing dimensions. We produced the open die forgings, which were then normalized and machined.  The forgings will be welded to centrifugally cast tubes and then the entire assembly will be finish machined before field installation in the new furnace.

The forgings weigh 70 pounds in the rough machined condition and were produced from a grade of heat resistant alloy steel.

forget furnace roll trunnions