What Key Physical and Mechanical Properties Do Aluminum Castings Have?

Aluminum castings carry a set of unique comprehensive properties unmatched by ferrous cast materials.First,ultra-low density brings a prominent high strength-to-weight ratio;the weight of aluminum parts is nearly one-third of steel castings of the same volume,greatly reducing overall equipment load and energy consumption in automotive and aerospace fields.Second,the material forms a dense passive oxide film on its surface naturally,providing inherent resistance to atmospheric rust and weak chemical erosion without extra coating processes.Third,aluminum owns excellent thermal and electrical conductivity,making castings the primary material for heat dissipation shells,electrical equipment enclosures and conductive structural brackets.After standardized heat treatment,qualified aluminum castings achieve stable tensile strength and elongation values,balancing rigidity and slight deformation tolerance for daily mechanical operation.Meanwhile,cast aluminum shows good machinability,with lower cutting tool wear during post-processing compared with iron castings.