Organization of grey
Ferrite—— fully carry on graphitizing process
Pearlitecasting ——fully carry on graphitizing process of stage 1 and graphitizing process of stage 2，graphitizing process of stage 3.
Pearlite grey iron casting ——fully carry on graphitizing process of stage 1 and graphitizing process of stage 2，hardly carry on graphitizing process of stage 3.
Performance of grey iron casting
Performance of grey iron casting mainly depends on the performance of matrix and quantity, form,size, disposition of graphite， among these , the performance of pearlite matrix and the performance of grey iron casting which is made from graphite is optimal. The range of applications is most extensive.
Tensile strength and ductility of grey iron casting is much more lower than steel has the same matrix.But graphite flake has no influence to the compression strength of grey iron casting.
Grey iron casting has better casting performance and handling characteristics. Graphite has effects of anti-attrition and shock absorption.
Treatment of alteration:
Join alterant in iron liquid before pouring, promote grain refinemen
The passage above talks about parts of organization and performance of grey iron casting.