Verbundwalze und Verfahren zu ihrer Herstellung

摘要

The compound roll having a shell portion made of a hard, high-alloy cast steel or iron having excellent wear resistance and resistance to surface roughening and a core portion made of a tough cast iron or cast steel, the cast iron of the shell portion having a composition consisting essentially, by weight ratio, of 1.0-3.0 % of C, 2.0 % or less of Si, 2.0 % or less of Mn, 2.0-15.0 % of Cr, 10.0 % or less of Mo, 2.0-8.0 % of V, the balance being substantially Fe and inevitable impurities, an average diameter of crystal grains constituting a matrix of the metal structure of the shell portion being 100 mu m or less in a range from a surface to a depth of 50 mm when determined by an image analysis method on the crystal grains having diameters exceeding 30 mu m, and the crystal grains satisfying the formula: m2