The alloy with 0.4% Mg and 0.5% Si was torsion tested in the range 0.1 to 10 s(-1) and 300 to 500 degrees C with exhibition of excellent ductility. The hot strength was shown to be low compared to other 6000 series alloys and to have little tendency to dynamic precipitation. The hyperbolic sine constitutive equation was optimized with a stress multiplier of 0.03 MP a(-1).