Chilled Cast Iron Rolls
Chilled Cast Iron Rolls have a structure consisting of more flake graphite with few uniform carbides in a Pearlitic matrix. Harder grades have a Bainitic-Martensitic matrix with an increased amount of carbides. The presence of flake graphite improves spilling resistance and also enhances resistance to fire cracking. All of these properties combined with the excellent surface finish make AIC Alloy Indefinite Chill very suitable for rolling flats sections and similar products where surface finish is critical. 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. Generally there are three types; (I) Definite Chilled Cast Iron, (II) Indefinite Chilled Cast Iron & (III) Bainitic Chilled Cast Iron.
| Chemical Composition (Range) | Physical Properties | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C% | Mn% | Si% | Cr% | Ni% | Mo% | V% | S% | P% | Hardness Range (Shore 0C) | Tensile Strength (N/mm2) | Bending Resistance N/mm2) | |||
| 2.80 3.50 | 0.60 1.25 | 0.60 1.25 | 1.00 2.00 | 1.00 3.50 | 0.50 1.50 | 0.20 Max | 0.080 Max | 0.10 Max | 500C - 800C | 150 – 250 | 250 – 350 | |||
Product Application
Application of Alloy Indefinite Solid Chilled Iron Rolls according to Hardness range as per below
| Rolling Mills | Mill - Type | Stands - Position | Pass - Condition | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Plate, Medium & Narrow Strip | 2, 3 & 4 Hi | Roughing | In case of deep or light groove pass, low reduction & short or long rolling length | |||||||||
| Billet & Sheet Bar, Medium Section Mill & Flat | 2 & 3 Hi | Intermediate & Finishing- stand | ||||||||||
| TMT, Wire Rod, Round & Bar Section Mills | Intermediate & Finishing- stand | |||||||||||
