Impact of Inhomogeneous Melt Composition on Aluminum Billet Mechanical Performance In continuous aluminum melting and casting lines, mixing of old and new melt, local thermal gradients, and impurity segregation lead to uneven distribution of molten aluminum composition. Composition fluctuations alter mechanical indicators including tensile strength and elongation, causing property dispersion within the same batch of aluminum billets. Under 25–35 t/h casting throughput, melt