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NEW DEVELOPMENTS FOR BACKUP ROLL MATERIALS

GP is a manufacturer of cast compound BUR with ductile steel core. These rolls combine a ductile, low-alloyed steel core with an outer layer material that is resistant to abrasive wear, corrosion and fatigue. The impact on backup rolls in hot and cold rolling applications is more demanding since new powerful mills have been developed.The product mix of the mills is dominated by a high share of AHSS. GP has developed a new high alloyed BUR with a ductile core. The shell is alloyed with Cr, Mo and V with a Chromium level of almost 8%. In some applications cast backup rolls have a disadvantage compared to forged rolls, since the cast structure provide natural insufficiencies. In mills with tough rolling conditions the integrity of the roll is depending on the fatigue limit of the roll material and here a forged structure provides advantages due to lacking casting defects. GP made trials to improve the properties of the 5% Cr grade by applying an additional deformation of the shell. The objective of these trials is to produce a compound backup roll that combines the advantages of a ductile steel core with the good properties of a forged outer layer.