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High Speed Steel (HSS) Rolls

High Speed Steel Rolls, produced by horizontal centrifugal casting process, are all compound rolls with high speed steel as the work layer and nodular iron as the core. The material of HSS contains plenty of alloyed elements such as Mo, V, W, Cr etc. The high hardened eutectic carbides & second carbides, such as MC, M2C, M6C evenly distributed in tempered martensitic matrix, make the wear and thermal cracking resistance very excellent. Besides, the resistance of surface roughing is also good. In conditions of hot strip rolling, the contact points between steel strip and the work rolls can form a thin adherent oxide film on the roll surface, which plays a good role in the wear features and the quality of the strip surface.

Advantages over Conventional Cast Iron Rolls

  • Increase in Pass life of Roll:It is estimated that the useful life of HSS rolls is almost 5-6 times more than that of conventional rolls. Meaning that over all cost of rolls consumed per tonne of finished steel produced is much less.
  • Increase in Efficiency & Output of Mill:The regular change of roll pass after wearing out consumes a lot of time and results in production loss and huge energy loss. Because of the longer pass life of the HSS rolls the time required for repetitive changing of roll pass is considerably reduced.
  • Better Surface finish of Product:Since the passes of the HSS rolls have a greater resistance to wear and tear, the shapes of the grooves are stably maintained. Due to higher wear resistance property compared to conventional rolls, the frictional impact during each pass is minimum which results in better quality of rolled product for a longer tenure.

Applications

  • Finishing stands for TMT Bar and Wire Rod Mills
  • Slitting and Dog bone stands of Rebar Mills

Grades

  • Semi-HSS (80-85 Shore C)
  • HSS (80-85 Shore C)

Mechanical Properties

  • Tensile Strength: ≥350 Kg/mm²
Chemical Composition
Grade Hardness
(Shore C)
C% Mn% Si% Cr% Ni% Mo% S% P%
Semi-HSS 80-85 0.6-1.2 0.5-0.8 0.8-1.5 3.0-9.0 0.2-1.2 2.0-5.0 0.4-3.0 0.1-8.0
HSS 80-85 1.5-2.2 0.4-1.2 0.3-1.0 3.0-8.0 0.1-1.5 2.0-8.0 2.0-9.0 0.1-3.0