The DPIC roll, Double Poured Indefinite Chilled Rolls also referred to as the Descaling, Pre-Interstand Cooling roll, holds immense significance within hot rolling mills. Its primary function is to eliminate scale and cool the material prior to its passage into the subsequent stand. By undertaking this process, the DPIC roll effectively enhances the surface quality of the material, minimizes material loss, and optimizes the overall efficiency of the rolling mill. Consequently, the DPIC roll plays a pivotal role in guaranteeing the production of high-quality hot rolled products. DPIC are manufactured by a combination of two techniques. First the molten metal with alloys such as Silicon, Nickel, Chromium, Molybdenum and Manganese is spun cast so that the shell at the surface has high wear resistance and Second the core of the metal is statically cast. The Core can be grey iron with flake graphite, iron or Spheroidal Graphite Iron depending on the mill requirement of neck strength. These rolls have hard alloy iron on the working layer and soft grey iron or SG iron core depending upon the application. The shell matrix with proper distribution of carbides and graphite imparts high wear resistance, stability in shape and good surface finish. The softer core ensures good mechanical properties and resistance to thermal & mechanical loads.
Chemical Composition of DPIC Rolls.
| Hardness | C. % | Mn. % | Si. % | Cr. % | Ni. % | Mo. % | S. % | P. % |
| 70-75 | 3.10-3.40 | 0.60-0.90 | 0.70-1.10 | 1.20-1.60 | 2.50-4.00 | 0.25-0.40 | 0.050 Max | 0.10 Max |
| 75-80 | 3.10-3.40 | 0.60-0.90 | 0.70-1.10 | 1.40-1.80 | 2.50-4.50 | 0.25-0.40 | 0.050 Max | 0.10 Max |
| 80-85 | 3.20-3.50 | 0.60-0.90 | 0.70-1.00 | 1.60-1.90 | 4.00-4.50 | 0.25-0.40 | 0.050 Max | 0.10 Max |
