Recent Industrial development is characterised by short and flexible production routes. This might be one reason for the invention of the thin slab casting technology within the last decade. This technology can be regarded as a further development of the slab casting technology commonly invented during the sixties and seventies. The thickness of the cast slab is about 250 mm which differs widely from the desired final thickness of 5 mm to 0,5 mm. Consequently, the casting is followed by several hot and cold rolling operations simultaneously causing high invention and maintenance costs. Thin slab casting reduces the cast thickness significantly. By coupling of casting and inline forming operations (such as descaling and hot rolling), a short production route was realised. With regard to further reduction of energy and emission, a further shortening of the processes is desired. Nevertheless, the reduction of the cast thickness is limited using this technology. Consequently, an other technology was searched for in order to overcome this barrier. Strip casting due to the double roller principle is very attractive for this reason. It uses rotating moulds instead of oscillating ones. The melt solidifies upon the surfaces of each of the counter rotating rolls. These strip shells are formed to one single strip in the narrowest roll gap. Typically, the strip is of 1 to 4 mm thickness.Double roller casting is a jump in technology. Originally, the idea of strip casting is dating back to the end of the 19th century. In spite of the fine idea, problems in automatic control and materials technology let the process fall into oblivion until its rediscovery in the late 20th century. Research on this field began nearly simultaneously at several places all over the world among them Japan, North America and Europe. It was recognised, that the rapid solidification and cooling could give special properties to the strip. Thus, basic studies of the process were made by means of laboratory scale plants. Afterwards, semi- and pre-industrial plants were built and tested.
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