A casting roller or belt for a revolving chill mould of a strip casting system for the manufacture of an aluminium alloy strip and a strip casting system for manufacturing an aluminium alloy strip comprising at least one revolving chill mould with a casting gap. A method for manufacturing an aluminium alloy strip by means of a strip casting system. The object of providing a casting roller or belt or a strip casting system, by means of which, adhesion to the casting roller or belt is avoided during strip casting and a low-segregation and crack-free aluminium alloy strip can be produced, in particular under industrial conditions, is achieved by a specific surface structure, in that the surface of the casting roller or belt has a roughness value Sa of more than 5 μm and an average peak count RPc(0.5 μm) of less than 42 cm.sup.−1.

A method for producing a structural component including the following steps: a) forming of the structural component; b) removing material from the structural component; c) thermal treatment of the structural component following step b; d) removing further material from the structural component following step c.

An apparatus for treating a surface of a strip casting twin roll includes: a laser machining unit configured to form dimple patterns on a surface of a rotating casting roll using a laser; a machining region processing unit, wherein if the casting roll is rotated by a critical angle, the machining region processing unit calculates a size and a position of a machining region, in which a dimple pattern will be formed, based on image information obtained by imaging the machining region; and a laser beam absorbing unit, wherein if the size of the machining region is smaller than a size of the dimple pattern, the laser beam absorbing unit places a screen at an overlap start position from which the machining region and the dimple pattern start to overlap each other, so as to absorb a laser beam emitted toward a peripheral region of the machining region.

An apparatus for treating a surface of a strip casting twin roll includes: a laser machining unit configured to form dimple patterns on a surface of a rotating casting roll using a laser; a machining region processing unit, wherein if the casting roll is rotated by a critical angle, the machining region processing unit calculates a size and a position of a machining region, in which a dimple pattern will be formed, based on image information obtained by imaging the machining region; and a laser beam absorbing unit, wherein if the size of the machining region is smaller than a size of the dimple pattern, the laser beam absorbing unit places a screen at an overlap start position from which the machining region and the dimple pattern start to overlap each other, so as to absorb a laser beam emitted toward a peripheral region of the machining region.

A casting roller or belt for a revolving chill mould of a strip casting system is provided for the manufacture of an aluminium alloy strip. The strip casting system for manufacturing the aluminium alloy strip includes at least one such revolving chill mould with a casting gap. In the casting roller or belt of the strip casting system, adhesion to the casting roller or belt is avoided during strip casting, and a low-segregation and crack-free aluminium alloy strip can be produced under industrial conditions. This is achieved by utilizing a specific surface structure of the casting roller or belt in which a roughness value Sa is more than 5 m and an average peak count RPc (0.5 m) is less than 42 cm.sup.1.