COMPOSITE WORK ROLL FOR COLD ROLLING

摘要

A composite work roll for cold rolling, having an outer layer portion having a high wear resistance or spalling resistance. The outer layer portion comprises 0.9 to 1.5 wt.% of C, 0.3 to 1.0 wt.% of Si, 0.3 to 1.0 wt.% of Mn, 4.0 to 10.0 wt.% of Cr, 2.0 to 8.0 wt.% of Mo, 0.5 to 5.0 wt.% of V and the balance of Fe and unavoidable impurities. The composite work roll for cold rolling having a high wear resistance is produced by forming the outer layer portion having the composition described above and having a content of Mo of 3.0 to 8.0 wt.% around a core made of cast steel or forged steel by continuous tinkering-padding. The composite work roll for cold rolling having a spalling resistance has an outer layer portion which has the composition and is formed by continuous tinkering-padding and of which the surface portion has a compressive residual stress of not higher than 60 kgf/mm and a Shore hardness of at least HS90.