AIC Alloy Indefinite Chill Iron Rolls
The barrel structure of AIC Alloy Indefinite Chill Iron rolls is not as that of a clear chill Iron which is a white Iron, but rather a gradual transition from a carbide rich structure containing a small amount of fine flake graphite at the surface to a gray core material. The barrel surface is in an intermediate state between white and gray iron. Part of the carbon forms flake graphite and the remainder forms carbides. The amount of graphite is less prominent in higher hardness grades and increases towards the centre of the roll. Thus, a hardness gradient is developed between the core and the shell. The depth of the chilled layer is difficult to define and the hardness decreases gradually towards the centre of the roll.
In softer grades, AIC Alloy Indefinite Chill Iron have a structure consisting of more flake graphite with few carbides in a pearlitic matrix. Harder grades have a bainitic-martensitic matrix with an increased amount of carbides.
Due to alloy additions, hardness penetration is better than that of a clear chill roll and this material may be used in applications with deeper groves such as small and medium section rolling and also for finishing billets.
The presence of flake graphite improves spalling resistance and also enhances resistance to fire-cracking. All of these properties combined with the excellent surface finish make AIC Alloy Indefinite Chill Iron very suitable for rolling flats, sections and similar products where surface finish is critical.
All rolls of this material are statically single poured.