The aim of the present work is to develop a model within Qform, a Lagrangian FE Code environment to predict the grain evolution of 6XXX aluminum alloys during deformation and subsequent static recrystallization. Experimental data were obtained from backward extrusion campaigns (AA6060-O and AA6082-O) that were performed at different conditions of temperature and strain rate. All the specimens were subjected to microstructural analysis in terms of grain size: before extrusion (initial grain size), immediately quenched after extrusion (evaluation of dynamic recrystallization) and after a full annealing heat treatment (evaluation of a fully static recrystallization). The regression between experimental data and FEM computation allowed to validate a theoretical model for the grain size and shape evolution during dynamic recrystallization of 6060 and 6082 alloys previously developed on a different experimental campaign and to implement and evaluate a static recrystallization model proposed in literature (by considering 100% of recrystallization only) on AA6060 alloy.