SOLID FORGED BACKUP ROLLS FOR COLD- AND HOT-ROLLING MILLS

Modern cold- and hot-rolling mills comprise complexes of machines and mechanisms to carry out metal forming, handling, straightening, coiling and cutting. Rolls mounted in a mill stand are the main tools to change material form, to alter limiting dimensions, required shape and surface roughness, and other properties.
Being an integral part of roll mill stands, backup rolls bear the total rolling force and provide the required rolling quality, productivity and efficiency.
 
Rolls are made of vacuum-degassed carbon and alloyed steel. Steel grades close to eutectoid and hypereutectoid steel provide for high hardness and durability.
 
Depending on operating conditions, backup roll durability is provided by means of complex chromium, molybdenum or vanadium alloying.
 
To verify metal surface and structure quality, roll sections undergo ultrasonic examinations at principal manufacturing stages.
 
Guaranteed features:
 
High and uniform hardness after hardening (spread of 3 to 4 HSD over the barrel surface) by means of TFC unit;
Effective layer depth up to 75 mm (radially);
High durability, along with plasticity and toughness, of the roll material;
No barrel surface crack formation or spalling;
No metallurgical or structural flaws;
Minimum value of residual thermal stress;
No design flaws, which might reduce roll durability or cause incompliance with the dimensions on drawings;
Strict compliance of chemical composition to the steel grade.