The level of Mn (and Cr) as well as the homogenization practice greatly influences the extrudability, quench sensitivity and grain‘ structure of AlMgSi alloys. As pointed out by Lohne and Dors [13] the homogenization temperature will effect the dispersoid density. The level of dispersoid additions cannot be taken not account without considering the homogenization treatment. Low-temperature treatments can produce a very fine density of dispersoids. This will increase the material flow stress. and reduce the chance of recrystalizatiort These treatments are quite useful in reducing coarse grain formation atom the T6 heat treatment of forging stock. Alloys such as 606i, which contain little Mn by comparison. are more prone to coarse grain formation during heat neatments and are therefore less suitable for these applications.