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Spheroidal Graphite Iron (Acicular) Rolls

Spheroidal Graphite Iron Bainitic Acicular/Bainitic Rolls are alloyed with higher % of Ni and Mo resulting in bainitic matrix with increased carbide content. These rolls have higher strength, toughness and wear resistance than SGI Pearlitic Rolls. These rolls are popularly known as “Acicular” Rolls due their graphite and carbide constituents being in an acicular (needle like) bainitic matrix. These rolls are capable of higher hardness and have high hardness penetration. They find applications in a wide range of mills. Sufficient water cooling is necessary for their best performance.

Applications

  • Intermediate and Finishing Mill stands for TMT Bar Mills, Rail and Structural Mills.
  • Intermediate and Finishing Stands of Wire rod and Strip Mills

Grades

  • SGA-62 (60-65 Shore C)
  • SGA-67 (65-70 Shore C)
  • SGA-72 (70-75 Shore C)

Mechanical Properties

  • Tensile Strength: 450-600 Kg/mm²
  • Bending Strength: 800-1100 Kg/mm²
Chemical Composition
Grade Hardness
(Shore C)
C% Mn% Si% S% P% Cr% Ni% Mo%
SGA-62 60-65 3.0-3.4 0.4-0.7 1.3-1.6 0.02 Max 0.05 Max 0.4-0.7 2.0-2.5 0.4-0.7
SGA-67 65-70 3.1-3.5 04-0.7 1.2-1.5 0.02 Max 0.05 Max 0.4-0.8 2.5-3.0 0.6-0.9
SGA-72 70-75 3.2-3.6 0.4-0.7 1.2-1.5 0.02 Max 0.05 Max 0.4-0.8 2.8-3.4 0.8-1.0