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Alloy indefinite chilled cast iron rolls (rings) with distinct character of contain minute graphite on their surface layer are different from chilled cast iron rolls (rings). The graphite dispersed in the whole barrel's cross-section, its amount and sized increase with depth. We manufacture this type of rolls (rings) by adding Mn, Cr, Ni, Mo and other alloy elements, with present of minute graphite, the roll (rings) can be ensured being raised the properties of resistance to spalling, firecrack and wear resistance while maintaining the surface hardness almost no drop. The biting ability is also improved owing to the existance of minute graphite porosity.

Microstructure:

Matrix 500X pearlite+ Carbide	Matrix 500X fine pearlite+ a little of bainite+carbide
Chemical Composition (%) Symbol Material C Si Mn Cr Ni Mo IC-1 CrMo indefinite 2.9-3.7 0.6-1.2 0.4-1.2 0.6-1.2 0.2-0.6 IC-2 NiCrMo indefinite 2.9-3.7 0.6-1.2 0.4-1.2 0.7-1.2 0.5-1.5 0.2-0.6 IC-3 NiCrMo indefinite 3.0-3.7 0.6-1.2 0.4-.1.2 0.7-1.2 1.5-3.0 0.2-0.6    Physical Properties: Symbol Barrel hardness HS Neck Hardness HS Tensile Strength MPa   IC-1 58-70 35-55 >160 IC-2 62-72 35-55 >160 IC-3 68-75 35-55 >160    Application: IC-1 Rolls for intermediate and finishing stands of bar, rod mills and section mills. IC-2 Rolls for intermediate and finishing stands of bar, rod mills and section mills, stretch reducing rings for seamless tube mills IC-3    The capacity of making: Type Diameter of barrel (mm) Length of barrel (mm)     Rolls < £X 650 < 1500     Rings £X 190-600 400 (max.)