Grade and chemical composition:

  Roll blank grade: GB/T221-2008，Chemical composition: ordinary and high quality， Common grade : GB/T 15547-2012，High grade :CU≤0.15、P≤0.015、S≤0.010, (1)Pb、As、Sb、Sn≤0.015，Bi≤0.010；（2）Electroslag remelting steel [H] ≤1.5*10-6、[O] ≤30*10-6，or Refined steel [H] ≤1.5*10-6、[O] ≤25*10-6.
  Note1：The specific level of acceptance by the supply and demand sides consultations, but also can be used to negotiate the supply and demand of other brands and chemical composition.
  Note 2：[H][O] billet sampling.

Hardness:

After annealing, the hardness value is not more than 255HBW.
After quenching and tempering, the hardness of the roller is determined by both parties.

Manufacturing process:

The work roll, intermediate roll, support roll and straightening roll blank should be integrally forged.
  Work roll, support roll and straightening roll billet steel by refining or electroslag remelting two smelting refining method, such as the use of other smelting methods, relevant inspection requirements negotiated by both parties.
  When forging ingot, the forging ratio of work roll, intermediate roll and straightening roll is not less than 3, and the forging ratio of support roller should not be less than 2.5. When the Electroslag Remelting Ingot is forged, the forging ratio is not less than 1.5.
  When forging ingot, the work roll, intermediate roll, straightening roll forging ratio is generally not less than 3, the supporting roll roll forging ratio should not be less than 2.5. When the Electroslag Remelting Ingot is forged, the forging ratio is not less than 2; the forging ratio is not less than 1.5.
  There should be enough amount of the steel ingot to ensure that there is no residual shrinkage and serious segregation of roller blank. 
After heat treatment, it is necessary to ensure that there is no white spots inside the roll blank, good ultrasonic penetration and cutting performance.

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