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Slide 34 of 69
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Extrusion is a hot working technique where billets, cut from continuously cast logs, preheated to between 600°C and 800°C are forced through a die that is shaped in the form of the finished product. This gives round rod, square, hexagonal or special profiles as required. The use of a mandrel allows hollow extrusions to be produced. Duplex materials that have good ductility at hot working temperatures are usually used for extrusion. The resulting structure of the material is uniform with a fine grain structure.