Produced by static duplex casting and differential harden heat treatment methods, which ensures the shell/core material matching the rolling condition.
After further heat treatment, the back-up rolls are of the following advantages:

• Higher hardness uniformity of barrel surface and maintain the hardness to the discarded diameter;
• Very good wear resistance for the whole working layer;
• Excellent anti-spalling property;
• Excellent resistance to fracture due to high
  strength of core material;
• Uniform wear curve and good strip profile;
• Longer rolling campaign;

Produced by vertical centrifugal casting method in most cases. Rolls of different type and material are of the following advantages:

• Good wear resistance property and roll gap stability;
• Prolonged service period at condition of maintaining good strip profile and surface quality;
• Good anti-fire and anti-spalling property;
• Suitable for any combination of rolling program and possibility of hot charging;
• Less non-production redressing;

• Good physical property;
• Good biting performance
• No slipping or trembling at big rolling draft;
• Prolonged service period attributed to good wear resistance and resistance to fire-cracking;
• Stable wear curve and smooth surface;
• Stable strip profile;

• Excellent anti-spalling property;
• No soft spots;
• Good wear resistance;
• No secondary quenching;
• Little non-production redressing;
• Prolonged service period;
• No stain spots;