The SG Iron rolls are generally chill cast with the working surface having eutectic Cementite and free graphite in Spheroidal morphology. The addition of appropriate alloying elements in carefully adjusted combinations are practiced to get a wide range of matrix microstructure varying from fine Pearlite to Bainite or Acicular Martensite depending on the area of application of the roll. Precise inoculation & control of the rate of cooling during solidification allows the proportion of Cementite to be reduced at the same time allowing an increase in the proportion of graphite nodules.

Spheroidal Graphite or Ductile Iron Rolls (SG Iron Rolls) are generally used in Roughing and Intermediate Stands of Structural and Section mills as well as Finishing Mill of wire rod & light structural mills where the toughness and wear resistance of the rolls are critical for getting a good performance during use.