Abstract: A method according to the invention of changing the mounting condition, in particular of mounting or dismounting of a printing master on a printing master cylinder having a first receiving element for the leading edge and a second receiving element for the trailing edge of the printing master includes rotating the printing master cylinder at a first speed, actuating the first receiving element in at least one first phase position and actuating the second receiving element in at least one second phase position. At least between a third phase position and a fourth phase position, the printing master cylinder may be rotated at a second speed, which differs from the first speed. Due to the reduced speed, the window of time for actuating one or both receiving elements can be extended to increase the precision and reliability of the locking and release.

Abstract: A method according to the invention of changing the mounting condition, in particular of mounting or dismounting of a printing master on a printing master cylinder having a first receiving element for the leading edge and a second receiving element for the trailing edge of the printing master includes rotating the printing master cylinder at a first speed, actuating the first receiving element in at least one first phase position and actuating the second receiving element in at least one second phase position. At least between a third phase position and a fourth phase position, the printing master cylinder may be rotated at a second speed, which differs from the first speed. Due to the reduced speed, the window of time for actuating one or both receiving elements can be extended to increase the precision and reliability of the locking and release.

Abstract: 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.

Abstract: 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.

Abstract: The composite bimetallic roll for cold rolling obtained by casting comprises a heart metal constituted by a nodular or lamellar cast iron and a case metal constituted by a steel having a chromium content of 8 to 16% and a carbon content of 0.65 to 0.95%. The chromium/carbon ratio is between 11 and 16 and the structure of the case metal is martensitic with a content of residual austenite of less than 10%.

Abstract: The composite bimetallic roll for cold rolling obtained by casting comprises a heart metal constituted by a nodular or lamellar cast iron and a case metal constituted by a steel having a chromium content of 8 to 16% and a carbon content of 0.65 to 0.95%. The chromium/carbon ratio is between 11 and 16 and the structure of the case metal is martensitic with a content of residual austenite of less than 10%.