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Enhanced High Chromium Iron Rolls are widely used in early finishing stands of hot strip mills, skin pass stands, and finishing stands of small section mills. The high chromium content in the shell material, together with the absence of free graphite, provides excellent wear resistance and stable rolling performance under demanding conditions.

Different carbide structures combined with high hardness and tempered martensitic microstructure ensure superior mechanical properties and extended service life. Enhanced HiCr rolls are additionally alloyed with elements such as V, W, and Nb to increase eutectic carbide hardness and significantly improve rolling performance.

High Chromium Steel Rolls are similar to HiCr cast iron rolls but contain lower carbon content ranging from 1.0% to 1.8%. Lower carbon grades are true steel grades without eutectic carbides, while higher carbon grades contain partial eutectic carbides. These rolls are suitable for roughing stands of hot strip mills, Steckel mills, and selected early finishing positions.

Chemical Composition

Symbol C Si Mn Cr Ni Mo V
HCr I 2.30-3.30 0.30-1.00 0.50-1.20 12.00-15.00 0.70-1.70 0.70-1.50 0.00-0.60
HCr II 2.30-3.30 0.30-1.00 0.50-1.20 15.01-18.00 0.70-1.70 0.70-1.50 0.00-0.60
HCrIII 2.30-3.30 0.30-1.00 0.50-1.20 18.01-22.00 0.70-1.70 1.51-3.00 0.00-0.60
HCrS 1.00-1.80 0.40-1.00 0.50-1.00 8.00-15.00 0.50-1.50 1.50-4.50 -

Physical Properties

Symbol Barrel Hardness Roll Neck Hardness Tensile Strength
HCr I 60-75 HS 32-45 HS ≥500 MPa
HCr II 65-80 HS 32-45 HS ≥500 MPa
HCrIII 75-90 HS 32-45 HS ≥600 MPa
HCrS 70-85 HS 35-45 HS ≥700 MPa

 

Product Features

  • High chromium alloy structure with excellent wear resistance.
  • Tempered martensitic matrix for improved mechanical properties.
  • Enhanced crack resistance and thermal stability.
  • Suitable for demanding hot strip and plate mill applications.
  • Available for roughing, intermediate, and selected finishing positions.