Chavanne-ketin

Chavanne-ketin Institut De Recherches De La Siderugie Francaise

Jean-Claude Werquin

Jacques Bocquet

A composite working roll, in particular for a roughing or finishing stand of a hot strip rolling mill, said working roll comprising a core of a metal selected from the group consisting of iron and steel, an outer zone of chromium-vanadium steel and a bonding zone between said core and said outer zone, wherein said steel of said outer zone contains 1.3 to 2.2% by weight carbon, 8 to 16% by weight chromium and 4 to 7% by weight vanadium, the remainder being constituted by iron and other elements which are usually present. Preferably the steel of the outer zone contains 9 to 14% chromium and 5 to 6,5% vanadium and the vanadium content decreases with increase in the carbon content.

Composite working roll for hot rolling flat products

A bimetallic composite back-up cylinder for a rolling mill, in particular for a four-coil or six-roll stand of a hot strip train finisher, comprises a metal envelope made of a steel having a chromium content between 13 and 17 wt. %, and a carbon content between 0.5 and 0.8 wt. % the chromium/carbon ratio being between 20 and 25.

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Ronchin, France

Jean-Claude Werquin