Gray iron Cast

Gray iron is selected for ease of machining, high compressive strength, better thermal conductivity and excellent vibration absorption.
Carbon content is by far the most important element for gray iron (usually 2% to 4%) to create tensile strength and machinability. When molten cast iron solidifies some of the carbon precipitates as graphite, forming tiny, irregular flakes within the crystal structure of the metal which enhances the desirable properties of cast iron, the flakes disrupt the crystal structure leading to cast iron's characteristic brittleness.

Gray iron is selected for ease of machining, high compressive strength, better thermal conductivity