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Indefinite Chilled (IC) Cast Iron Rolls

Indefinite Chilled CI Rolls are static cast rolls having a small hardness gradient in the working layer. The microstructure of these rolls varies from pearlitic to bainitic to martensitic controlled by the content of alloy elements. Desired hardness can be achieved by finding the right balance of graphite and carbides in the matrix by adjusting the chemical composition. These rolls are superior to Normal CI and Clear Chill CI rolls. The presence of flake graphite in the matrix enhances their resistance to wear, spalling and fire cracking making them suitable for products that require an excellent surface finish. Adequate water cooling is necessary.

Applications

  • Intermediate/Finishing stand of Wire Rod Mills, TMT Mills and Structural Mills.
  • Finishing stand of Strip, Sheet and Flat rolling mills.

Grades

  • ICCI-I (55-60 Shore C)
  • ICCI-II (60-65 Shore C)
  • ICCI-III (65-70 Shore C)
  • Bainitic Chill (70-75 Shore C)

Mechanical Properties

  • Tensile Strength: 200-400 Kg/mm²
  • Bending Strength: 250-400 Kg/mm²
Chemical Composition
Grade Hardness
(Shore C)
C% Mn% Si% S% P% Cr% Ni% Mo%
ICCI-I 55-60 3.0-3.4 0.4-0.7 0.7-1.0 0.05 Max 0.05 Max 0.5-1.0 0.5-0.8 0.1-0.3
ICCI-II 60-65 3.0-3.4 0.4-0.7 0.7-1.0 0.05 Max 0.05 Max 0.7-1.0 1.0-1.5 0.1-0.3
ICCI-III 65-70 3.1-3.5 0.4-0.7 0.7-1.0 0.05 Max 0.05 Max 0.8-1.1 1.5-2.0 0.1-0.3
B Chill 70-75 3.2-3.5 0.4-0.7 0.8-1.2 0.05 Max 0.05 Max 1.0-1.3 2.0-2.5 0.2-0.4