Work rolls

Work rolls

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Work rolls for all cold mills, such as 2Hi, 4Hi, 6Hi etc. Our surface work rolls withstand high area pressure and are characterized by very uniform hardness and homogenous microstructure, guaranteed hardness throughout hardened layer depending on steel used and optimal mechanical properties.  
 
These properties are achieved by using combined heat treatment. The rolls are quenched and tempered to the basic hardness first, and then the surface is hardened to reach the proper work hardness. These rolls are surface hardened in a dual-frequency induction hardening machine, followed by rapid cooling with nitrogen below -140 oC, and then tempered at low temperature.
 
This way we can always achieve optimal levels of retained austenite.
 
Work rolls are produced in the following dimensional range:

  • from 120 up to 850 mm diameter 
  • up to 5500 mm length
  • up to 7000 kg  weight
  • up to 67,5 HRC hardness

 

MOST FREQUENTLY USED STEEL GRADES

RAVNE W. Nr. DIN SAE-AISI CHEMICAL COMPOSITION (%) HARDNESS HRC
  C Cr Mo V Ni
OHV3 1.2304 85CrMo7   0,85 1,70       ≤ 67,5
OHV4 1.2327 86CrMoV7   0,85 1,70 0,30 0,10   ≤ 67,5
OHV5 1.2375 83CrMoV9   0,88 2,10 0,25 0,10   ≤ 67,5
OTV       0,70 3,00 0,50 0,10   ≤ 66
OTV1       0,80 3,00 0,50 0,10   ≤ 66
OTV1B       0,80 5,00 0,50 0,10   ≤ 66
OTVN       0,70 3,10 0,32 0,10 0,70 ≤ 66
VCMO140 1.7225 42CrMo4 4140- 0,40 1,10 0,20     ≤ 60

 

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