A Study on Quenching+Tempering Process of Cr12 Cast Iron

The influence of heat treatment process on structure and properties of Cr 12 cast iron with pearlite existing in its as-cast structure was studied. The test showed that the highest hardness was obtained when quenching temperature was 1 050 ℃. As the tempering temperature increased, the microstructure also changed and the hardness increased so the wear resistance was improved. When this type of cast iron used for producing grinding balls the optimal treatment is quenching at 1 050 ℃ + tempering at 400 ℃～500 ℃.