In general the down stream material response of non-heat treatable alloys in terms of workability, grain structure, texture and mechanical properties, is closely linked with chemical composition and heat treatment procedures. A key factor for the non-heat treatable alloys and which controls all important processing conditions and product properties is the precipitation of Mn- and Fe bearing dispersoids. What happens during the homogenisation treatment depends on the exact composition of the material, the material as-cast structure, dislocation structure and the temperature cycle. Some general tendencies can be given. For the 3xxx-series alloys the main objectives of the homogenisation treatment are the elimination of microsegregation, the transformation of coarse elongated particles into small spherical particles and the redistribution of Mn from solid solution to coarse particles and dispersoids. During the initial heating periode the content of Mn in solid solution is lowered due to nucleation and growth of Mn containing dispersoids. Above a temperature of similar to400-500degreesC the small dispersoids are no longer stable and only the large dispersoids and the primary particles continue to grow. In addition the Mn content in the primary particles is increased towards the equilibrium content. The particle structures and the solid solution level resulting from the homogenisation treatment will influence the subsequent deformation and recrystallization reactions.