| Material | Code | Chemical Composition（%） | Surface Hardness（HSD） | |||||||||||
| C | Si | Mn | Cr | Ni | Mo | P | S | V | Cu | Mg | Barrel | Neck | ||
| Pearlitic Nodular Cast Iron Rolls Ⅰ | SPⅠ | 2.90-3.60 | 1.40-2.20 | 0.40-1.00 | 0.20-0.60 | 1.50-2.00 | 0.20-0.80 | ≤0.15 | ≤0.03 | ≥0.04 | 45-55 | 35-55 | ||
| Pearlitic Nodular Cast Iron RollsⅡ | SPⅡ | 2.90-3.60 | 1.20-2.00 | 0.40-1.00 | 0.30-1.00 | 2.01-2.50 | 0.20-0.80 | ≤0.15 | ≤0.03 | ≥0.04 | 55-65 | 35-55 | ||
| Pearlitic Nodular Cast Iron Rolls Ⅲ | SPⅢ | 2.90-3.60 | 1.00-2.00 | 0.40-1.00 | 0.20-1.20 | 2.51-3.00 | 0.20-0.80 | ≤0.15 | ≤0.03 | ≥0.04 | 62-72 | 35-55 | ||