Application Fields, Implementations & Materials

SIWACO reducing rolls manufactured out of centrifugal compound cast iron are used in areas of high thermal and mechanical demands. Whereby on a normal chilled cast iron roll it is not possible to create a pure hardness depth from over 10% of the roll diameter, using centrifugal compound cast iron it is possible to achieve a defined hardness depth. Hereby, the calibre surface is even, and wear resistant, up to the largest pipe calibres. The surface hardness can be adjusted according to your wishes.

Material Recommendations for:

• Stretch Reducing Rolls
• Conti Rolls
• Pipe Straightening Rolls
• Sizing Rolls
• Plug Rolls
• Release/Loosening Rolls
• Rolls for Pipe Welding Devices
• Rolls for Crossrolling Mills
• Diescher Disc

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Stretch Reducing Rolls

Stretch reducing rolls are manufactured mainly according to the centrifugal compound cast iron method. Whereby the various materials can be combined such as: chilled cast iron, nodular iron, indefinite and grey cast iron. For special cases the material qualities chrome steel and special steel are available.

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Conti Rolls

The material selection depends upon the wear resistance and thermal demands as well as the maximum pipe diameter.

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Pipe Straightening Rolls

The pipe straightening rolls with a large curvature have a large enough working layer due to the centrifugal compound cast iron.
The straightening rolls are manufactured in one or two parts (coat/axis).
Very accurate machining of the outer shape according to a stencil and then polishing afterwards guarantee the best pipe surfaces.

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Sizing Rolls

Depending upon the usage the sizing rolls are manufactured in one or two parts in single-poured or compound cast iron.

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Plug Rolls

Plug rolls made of indefinite and nodular iron are wear resistant and at the same time easy to grip. If the wear resistance is more important than the gripping then nodular iron is preferred. The tensile strength can be increased by treating the nodular iron with a special thermal procedure.

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Release/Loosening Rolls

Release/Loosening Rolls are put under high wear but also under pressure demands. The material selection depends upon the demands and construction of the machine. With high mechanical demands the nodular iron quality is preferred, if necessary in a compound quality.

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Rolls for Pipe Welding Devices

The shape-, welding- and the driving roll for spirally welded pipes are manufactured out of cast iron, nodular iron or steel iron. The materials are distinguished by their high pressure resistance and good wear resistance.

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Rolls for Crossrolling Mills

The materials for the counter-bored rolls and rolls for crossrolling mills are distinguished by their high wear- and cracking resistance and their gripping characteristics.

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Diescher Disc

These bandages have to be resist against thermal stresses under high wear capacity. Additional they have to avoid adhesion of rolled material.

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