How rolls work

Resistant to thermal cracking

Strength and thermal crack resistance are the main requirements for rough rolls, and the working rolls of small 20-high mills weigh only about 100 grams, while the back-up rolls of wide and heavy plate mills weigh more than 200 tons. When selecting rolls, first of all, according to the basic strength requirements of the rolling mill for the rolls, select the main material for safe bearing (various grades of cast iron, cast steel or forged steel, etc.).


The speed of the finishing roll is higher, and the final product of rolling must have a certain surface quality, which is mainly required for hardness and wear resistance. Then consider the wear resistance that the roll should have when it is used.


In addition, there are some special requirements for the roll, such as when the amount of pressure is large, the roll is required to have strong bite ability and good impact resistance;


When rolling thin gauge products, the rigidity, uniformity of microstructure, processing accuracy and surface finish of the roll are more stringent;

Cutting performance

When rolling steel with complex sections, it is also necessary to consider the cutting performance of the working layer of the roller body.

When selecting rolls, some performance requirements for rolls are often opposed to each other, and the purchase and maintenance costs of rolls are very expensive, so the technical and economic pros and cons should be fully weighed to decide whether to use cast or forged, alloy or non-alloy, single material or composite materials.

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