HIGH SPEED STEEL ROLLS
 

SALIENT FEATURES

This grade of new generation roll material belongs to the high speed steel family, strongly alloyed with Cr, Mo, V & W, presence of fine dispersion of MC type primary carbide with M₆C, M₂C, M₇C₃ carbides, in tempered martensitic matrix.  Thus fine hard MC type carbides reduce the Crack propagation rate and increases the toughness and wear resistance.  Eutectic carbide network pattern is less than Hi-Cr Iron rolls.

In comparision to HiCr (Iron) grade, higher rolling campaign can be performed and the main features of these grades are the hard and strongly adherent oxide layers on the barrel surface with quick kinetics of formation.
 

MILL RELATED REQUIREMENTS

• Suitable crown in the roll to prevent buckling.
• Improved roll and rolling lubrication
• Increased roll cooling efficiency
  • Proper roll cooling to target roll body below 50⁰C after cooling (e.g. 3K - 4K gallon / minute / stand).

• Proper inter-stand cooling.
  • Strip surface temperature to be restricted below 950⁰C by inter-stand cooling.

• Installation of crack detection equipment on grinding machine.
   

IMPORTANT INFORMATIONS

• For right selection of HSS chemistry please furnish the following details -

  • Mill type / Stand no.
  • Materials being rolled (specification).
  • Type of final products.
  • Draft/s-Reduction in Area/s.
  • Max. Profile depth where applicable.
  • Screw Loads.
  • Starting & Finishing Temperatures.
  • Start & Finish Size of the product.
  • Existing roll quality problems if any.