Development of the optimum annealing cycle for calcium-modified cast iron

Abstract

1. Calcium modification of cast iron causes a decrease in the stability of cementite in annealing. 2. In the calcium-modified iron significant graphitization occurs in heating of it to 700°C with a hold of not less than 4 h. 3. For decomposition of cementite in calcium-modified iron in heating of it to 800°C a hold of 3 h and more is necessary. With an increase in heating temperature the hold must be reduced.