Large whole casting copper propeller was produced since 1969.However

for lack of experiences and management

propeller crack accident occurs.Origination of crack was described.Effects of casting defects

composition segregation

alloy properties and microstructure on service life of copper alloy propeller were expounded.Some countermeasures were presented to improve the quality of the product and ensure navigation safety including casting process

design and selection of materials as well as quality management.