Spheroidal graphite roll for its characteristic graphite spherical in the material structure. By adjusting the nickel, chromium, molybdenum and others alloying elements and after specific heat treatment process. Pearlite ductile iron roll and bainite spheroidal graphite micro structure can be formed.
Such rolls have a good strength, high temperature properties and anti-accident properties. Hardness fall within minimum on working layer, recognized as the most popular mill roll, they are applicable to all types of section steel mill.
The production process can be Static or Centrifugal according the requirement. The harness can be obtain with alloy material adjusting and heat treatment process.
| Chemical composition | Roll body HSD |
Feature | ||||||||
| C | Si | Mn | Cr | Ni | Mo | Other metal | ||||
| Conventional methods | CrMo infinite spheroidal graphite | 3.0-3.6 | 1.6-2.2 | 0.4-1.2 | 0.2-0.6 | – | 0.2-0.8 | – | 55-70 | Ordinary section steel, wire rod medium roll |
| Low Ni infinite spheroidal graphite | 3.0-3.6 | 1.4-2.0 | 0.4-1.2 | 0.3-0.8 | 0.5-1.0 | 0.2-0.8 | – | 55-70 | Ordinary section steel, wire rod medium-finishing roll | |
| Pearlite ductile iron | 3.1-3.5 | 1.4-2.0 | 0.4-1.0 | 0.2-1.0 | 1.5-2.5 | 0.2-0.8 | – | 48-65 | Section steel rough-medium roll, medium pipe roll | |
| Needle shaped ductile iron | 3.1-3.5 | 1.3-1.9 | 0.4-1.0 | ≤0.4 | 3.2-4.0 | 0.2-1.0 | – | 60-75 | Ordinary section steel, wire rod medium-finishing roll | |
| Centrifugal Casting | Medium Ni infinite spheroidal graphite | 3.1-3.5 | 1.2-2.0 | 0.4-1.2 | 0.2-1.2 | 1.0-2.0 | 0.2-0.8 | – | 55-65 | Continuous steel, wire rod medium-finishing roll |
| Pearlite casting | 3.1-3.5 | 1.4-2.2 | 0.4-1.2 | 0.2-1.2 | 1.5-3.0 | 0.2-0.8 | – | 50-65 | Continuous steel, wire rod medium-finishing roll | |
| Bainite centrifugal casting | 3.1-3.5 | 1.3-2.2 | 0.4-1.2 | 0.2-1.0 | 3.0-4.5 | 0.4-1.2 | – | 65-75 | Continuous steel, wire rod medium-finishing roll | |
| Improved Bainite ductile iron casting | 3.1-3.5 | 1.4-2.0 | 0.4-1.2 | 0.2-1.0 | 3.0-4.5 | 0.4-1.2 | yes | 70-80 | Continuous steel, wire rod medium-finishing roll | |
