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Hollow Tube Forgings

Hollows by Scot Forge

Scot Forge produces hollow tube-like forgings in diameters up to 90" with a 2" minimum wall thickness and up to 360" long or 300,000 lbs., in ferrous and non-ferrous materials.

Hollows Process Highlights

Forging a hollow tube begins by making an upset preform, then punching a hole through the center. The preform is then drawn out over a mandrel to the specified length and O.D./I.D. configuration.

Various Shapes

Hollows can be produced not only in a straight cylindrical shape but with unlimited variations of O.D.s and I.D.s, including tapers. We also provide closed-end cylinders, both with and without flanges, in various wall thicknesses and cylinder end configurations to accommodate our customers' requirements.

Forged Hollows Time & Cost Savings

Because the inside diameter of the hollow is forged rather than bored from a solid bar, Scot Forge eliminates the need for additional machining, customers save time, money and reduce material waste.

Scot Forge saves production time and increases part strength for customers by producing hollow parts, such as flange hollows, as single components rather than several components welded together.

Why Forged Hollows?

Solid steel bars require boring. Steel tubes frequently need excess machining. Castings often do not meet internal part strength specifications. 

Below are some examples of how forged hollow products have served as a customized solution for many of Scot Forge's customers: 

Forged Hollow Tube Advantages

  • Cutting waste
  • Reduced machining
  • Improved integrity

Process highlights

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1. Piercing the workpiece to complete the "preform" stage

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2. The hot ring preform has been placed on a mandrel in preparation for forging under the press

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3. The forging is drawn down and elongates over the mandrel

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4. Planishing smoothes the outside surface