Shaifali Rolls Ltd. Kalol, Gandhinagar, Gujarat

Ductile Iron Rolls are available in a wide range of hardness & composition for a variety of application. The matrix structure varies from Ferrito-Pearlitic, Pearlitic to Bainitic & Martensitic togeather with different carbide contents and graphite in the from of spheroidsnodules. The Rolls are used in Roughing, Intermediate as well as Finishing stands of both heavy & light section mills. Some critical grades are heat treated for higher strength. Chemical composition and structure are chosen to suit specific application.

These are cast iron based rolls alloyed with Nickel, Chromium and Molybdenum having a matrix of pearlite and carbide with flake graphite. These rolls are used primarily for Section Rolling. The material has very good thermal properties coupled with property of imparting good surface finish to the product. These rolls are also available in higher hardness range where the matrix is Bainitic instead of Pearlitic are used in finishing stands of rod mill.

S.G. Iron (Nodular) or Ductile Iron Rolls are available in a wide range of hardness & composition for a variety of application. The matrix structure varies from Ferrito-Pearlitic, Pearlitic to Bainitic & Martensitic togeather with different carbide contents and graphite in the from of spheroidsnodules. The Rolls are used in Roughing, Intermediate as well as Finishing stands of both heavy & light section mills. Some critical grades are heat treated for higher strength. Chemical composition and structure are chosen to suit specific application.

Moulding shops have all the necessary facilities like Sand Mullers, Moulding Boxes & Tackles, Patterns, Mould Drying Ovens, Compressors, Ladles of various capacities from 1000 Kgs to 6000 Kgs. ASSEMBLY AND CASTING : Assembly and Casting of Rolls are carried out in Casting Pits of various sizes and depths. HEAT TREATMENT : Heat treatments are carried out where ever required in one electric furnace of 30MT capacity. Temperature of the furnaces, during heat treatment cycles, are closely monitored and controlled. MACHINE SHOP :

S.G. Iron (Nodular) or Ductile Iron Rolls are available in a wide range of hardness & composition for a variety of application. The matrix structure varies from Ferrito-Pearlitic, Pearlitic to Bainitic & Martensitic togeather with different carbide contents and graphite in the from of spheroidsnodules. The Rolls are used in Roughing, Intermediate as well as Finishing stands of both heavy & light section mills. Some critical grades are heat treated for higher strength. Chemical composition and structure are chosen to suit specific application.

Rolls are tailormade products and therefore need careful production planning. Rolls are cast in chiller mould with a controlled allowance for contraction and machining. It is therefore necessary to have a mould of the desired size. A new mould is required to be made if oue is not available. After obtaining a order from a customer and a drawing for the reequired rolls, a method drawing for casting is made, according to which the mould for casting of the rolls is made. Melting of metal is carried out in any of the several induction melting units available as per requirement of metels. The melting charges are selected as per required chemistry of metal. Upon melting, samples are analyzed and necessary adjustments for various alloying elements made through additions of Ferro-alloys. Fracture tests are made and temperature measured to control the same through Immersion Pyrometeres. Metal is poured in the moulds through geared ladles of various capacities in pre-determined time to ensure clean metal in the mould.