subject: Cast Iron Classification And Properties [print this page] Generally, iron castings occupied more than 50% of weight of the machine equipments, so they are very important for the industry of one country.
The classifications of the cast iron
1. White cast iron
The carbon is on the surface of ferrites with small fraction and is in the form of Fe3c, the section of white cast iron is in sliver white color, its features is hard and fragile, it is difficult to be processed with machine and little used to produce parts. The main usage: it is used as the raw materials to make steel, also can be deal to malleable irons.
2. Gray cast iron
The carbon is on the surface of ferrites with small fraction and all is in the form of graphite, the section is in grey color. It is used widely actually, it occupies 80% of the cast iron. Their features are soft, fragile, poor intensity and small gravity. It includes common gray cast iron, malleable cast iron, ductile cast iron and vermicular graphite cast iron.
3. Mottled cast iron
It is belonged to the transition tissue between the white cast iron and gray cast iron. Because its property is not very good so it is used little.
4. Ductile Iron
Ductile iron is also called as spheroidal graphite cast iron or sg iron. Because of the nodular agent, the graphite form is shown as the spherodal, so this iron will have larger elongation and higher tensile and yield strength.
The factors which affect the micro-structure and property
1. The contents of carbon
When C=0.8%, it is pearlitic grey iron, the graphite piece is small and intensity is high, so it used to produce important parts. When C
