Conventional and improved indefinite chilled cast iron rolls are produced by horizontal centrifugal casting. The working layer of the conventional type has a structure between white cast iron and gray cast iron: part of the carbon forms graphite and part forms carbides; as the distance from the roll barrel surface increases, the graphite content rises and the hardness changes accordingly.
Technical Features of Improved ICDP
- Nb, V, W and other strong carbide-forming elements are added to the working layer, forming a large amount of fine, high-hardness, uniformly dispersed special carbides in a highly stable matrix.
- In the improved ICDP working layer, graphite exists as fine spheroids, whereas in the conventional type it appears as flake or vermicular graphite.
- From the roll barrel surface down to the scrap position, the improved ICDP shows little change in graphite morphology and a smaller hardness drop.
- The matrix contains 1%–2% of fine, high-hardness, high-melting-point MC-type special carbides, uniformly dispersed.
Performance Advantages
Based on the above differences and characteristics, the improved ICDP delivers a 20%–50% increase in overall service performance compared with the conventional ICDP. To address water-ripple and roll-mark problems in high-precision strip products such as silicon steel rolled on hot wide-strip mills, we have successfully developed dedicated rolls that completely solve these issues.
Main Applications
- Work rolls for finishing stands of hot wide-strip mills
- Work rolls for roughing and finishing stands of plate mills
- Work rolls for Steckel mills
