Abstract: Cylinder ferrule for continuous casting of metal or metal alloy, in particular aluminum, characterized in that it is made of a steel the composition of which, in percentage by weight, is the following:Carbon: 0.25 to 0.35%Manganese: 0.30 to 0.60%Silicon: 0.15 to 0.45%Nickel: below 0.40%Chromium: 2.90 to 3.5%Molybdenum: 2.5 to 3.1%Vanadium: 0.3 to 0.70%Sulfur: .ltoreq.0.020%Phosphorus: .ltoreq.0.020%Copper: .ltoreq.1%the remainder being essentially iron and residual impurities.

Abstract: The object of the invention is to improve the performance of the rolls of roughing and finishing stands of a hot strip train or mill and in particular to retard as far as possible the banding phenomenon, namely the phenomenon of the incrusting of hard oxides or scale formed at the convenience rolling temperatures.For this purpose, the roll is made, at least in the working region thereof, from a chrome steel in which the ratio between the respective contents of chromium and carbon is between 7 and 12 and in which the content of equivalent carbon is between 1.5 and 1.7%. This content of equivalent carbon is calculated as the sum of the content of carbon and the content of chromium, the latter being given a coefficient 0.05.