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Benefits of Centrifugally Cast Hydraulic Cylinders

Advantages for Centrifugally Cast Hydraulic Cylinders

Advantages for Centrifugally Cast Hydraulic Cylinders


There are numerous processes used to produce hydraulic cylinder bodies. Each can be economically appropriate in specific situations, but centrifugal casting offers unique advantages that meet your exacting needs. Consider the benefits below when designing and purchasing cylinder bodies.

Integrally Cast Flanges

The centrifugal casting process allows some shaping of the outer diameter of the work piece. As long as the shaping is graduated in a manner that allows the part to be removed from the die, the shape can be cast integrally. This feature was an important factor in off-road truck manufacturers switching from welded construction to centrifugals.

Typically, large heavy walled cylinders are flanged to accommodate the high pressures exhibited on the end seals. Welded construction utilizes seamless tubing or forged tubing (often economical when purchased in quantity) with a forged flange welded on one or both ends. The weld must be full penetration for safety reasons.

Subsequently, this assembly must then go through post weld heat treatment to achieve acceptable mechanical properties. An integrally cast flange from the centrifugal process will achieve strengths in excess of four times (4X) that of the welded/heat treated equivalent. For this reason alone, manufacturers have readily accepted centrifugal castings for their critical cylinder bodies.

Quantity Flexibility

While large regular runs are easily accommodated, centrifugal castings are particularly suited to smaller, job-specific runs. Seamless, DOM tubing or tube mill manufacturing can be very economical when purchased in large quantities or “mill runs”. At Spuncast, because each centrifugally cast tube is usually an “individual” furnace heat, small quantities will not drastically change the cost.

Delivery of Non-Standard Sizes

The centrifugal casting process lends itself extremely well to non-standard sizes. The dies, while not inexpensive, are manageable both financially and in lead time. The dies will shape and size 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 available in the required diameter or the desired wall thickness. Centrifugal castings are an excellent solution to this dilemma.

Alloy Flexibility

Through metallurgical control and a quench facility designed specifically for tubular parts, Spuncast is able to achieve high quality and repeatable mechanical properties from low alloy steels. This makes our tubes usable in many high pressure applications. Spuncast has the metallurgical experience and expertise to pour alloys including 17-4PH, duplex stainless steels, and super duplex stainless steels.

Availability of Heavy Wall Thickness

Centrifugal casting facilitates the production of heavy walled cylinders of 30 mm to 75 mm. Other methods of manufacturing are either incapable of these dimensions or would be cost-prohibitive. Centrifugal casting offers an economical means to meet design requirements.

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 Is Centrifugal Casting Right for Your Application?

Contact a Spuncast sales engineer to help you determine if centrifugal casting would be an economical option for your particular hydraulic application.