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Centrifugal Casting of Hydraulic Accumulators

Benefits of Centrifugally Cast Hydraulic Accumulators

Benefits of Centrifugally Cast Hydraulic Accumulators

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For the past 10 years, Spuncast has been manufacturing and selling hydraulic accumulator bodies to manufacturers of piston accumulators. Our customers’ applications have included a variety of equipment actuation functions on U.S. Navy submarines and surface ships, a wide array of functions for energy storage and actuation on offshore oil platforms, and many other uses. Recently, there appears to be a potential for applications on wind turbines, specifically for nacelle yaw and blade pitch operations.

The starting material used in the production of hydraulic accumulators can be produced by several processes. Hot extruded tubing, forged tubing, DOM (Drawn-Over-Mandrel) tubing, even tubing machined from bar stock – many customers have found cost efficiency using centrifugal castings.

Alloys can be tailored to specific property requirements. Spuncast has the in-house metallurgical experience to satisfy individual customer needs. Our customers have requested a wide variety of alloys for hydraulic accumulator bodies including:

  • Austenitic stainless steels
    • CF8M (316 SS)
    • CG8M (317 SS)
  • Duplex stainless steels
    • Modified version of ASTM A 890 Grade 1B (similar to Ferralium 255® *)
  • Martensitic stainless steels:
    • CA15
    • CA6NM (410 SS and a modified 410)
  • High strength/low alloy steels
    •  8630 material.

* Ferralium 255 is a registered trademark of Langley Alloys Ltd.

Download our Alloy Guide.

Excellent Mechanical Properties

The quality of the material is commonly governed by very stringent ASME or MIL specifications. Through tight metallurgical and process controls – and with a quench facility designed specifically for tubular parts – Spuncast is able to achieve excellent mechanical properties and corrosion resistance, along with tight dimensional and surface control. All of this is accomplished with an extremely high degree of repeatability.

Quantity Flexibility

Hot extruded tubing, DOM tubing or other mill products can be very economical when purchased in large quantities or “mill runs.” Because each centrifugally cast tube is usually an individual furnace heat, single pieces or small quantities do not drastically change the price. While larger runs are also easily accommodated, centrifugal castings are particularly suited to smaller, job-specific runs.

Delivery of Non-Standard Sizes

The centrifugal casting process ends itself extremely well to non-standard sizes. The dies, while not inexpensive, are manageable both financially and in lead time. The die forms only the outer diameter of the casting while the amount of molten metal poured sizes the inner diameter. When engineers design cylinders for a specific duty, there are many times when standard pipe sizes are not usable. The diameters may not be standard or the desired wall thickness may not be available. Centrifugal castings are an excellent solution to this dilemma.

Heavy Walled Cylinders

Centrifugal casting facilitates the production of heavy walled cylinders. Wall thicknesses of 30 mm to 65 mm are possible and common. Other methods of manufacturing are either not capable of these dimensions or will be cost prohibitive. Centrifugal casting offers an economical means to meet design requirements.

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Benefits

  • Alloy flexibility
  • Quantity flexibility
  • Non-standard sizes
  • Heavy wall thickness

Numerous processes can be used to produce hydraulic accumulator bodieswith each being appropriate and economical in specific situations. If flexibility of product and quantity are desired considerations, contact a Spuncast sales engineer to assist you.

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