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The main factors that affect the mechanical properties of ingot are grain size, ingot structure, ingot density, ingot heterogeneity, chemical composition and regional segregation. Generally, under certain conditions of chemical composition, the smaller the ingot grain, the finer the ingot structure, the higher the density, the smaller the degree of heterogeneity of the microstructure, and the lighter the degree of regional segregation, the higher the comprehensive mechanical properties of the ingot. Among them, for industrial pure aluminum and soft alloy, the decisive role is the grain size; For high component hard alloys, the fineness and density of intra - crystalline structure play a decisive role.

The distribution of mechanical properties along the ingot section varies with casting conditions. Water cooled semi - continuous casting. The lower mechanical properties at the ingot edge are due to the lower thermal conductivity of the mould wall. At the exit of the crystallizer, the cooling strength of the ingot increases sharply, the crystallization speed increases, and the mechanical properties increase. The performance of the ingot in the central region decreased dramatically as a result of lower cooling rates and larger transition zone sizes.

When the casting speed is low, the properties are evenly distributed along the cross section. The above distribution of properties is more obvious by increasing casting speed. It is easier to get more uniform properties by using high crystallizer than by using low crystallizer, but the average mechanical properties of ingot are reduced.