What Do You Know About Gray Cast Iron?

The carbon content of gray cast iron is relatively high, and it can be regarded as a carbon steel matrix with flake graphite. According to the different matrix structure, gray cast iron can be divided into three categories:1. Ferritic matrix gray cast iron;2, pearlitic ferritic matrix gray cast iron;3, pearlite matrix gray cast iron.

(1) Ferritic gray iron is distributed on the matrix of ferritic graphite sheet, its strength and hardness is relatively poor, gray iron manufacturers generally do not use this cast iron to produce castings.

(2) pearlitic ferritic gray cast iron, that is, in the pearlitic and ferrite mixed matrix, the distribution of relatively large graphite sheets, although the strength and hardness of this cast iron are lower than that of ferritic gray cast iron, but still can meet the general body requirements, its castability and vibration reduction is very good, and easy to melt, is currently the most widely used gray cast iron.

(3) pearlite gray cast iron, is in the pearlite matrix distribution of small, uniform graphite sheets, its strength and hardness is relatively high, gray cast iron manufacturers are more commonly used to manufacture bed and body and other important castings.

Gray cast iron manufacturers found that the microstructure of gray cast iron is different, which is essentially the form of carbon in the cast iron is different, the carbon in gray cast iron is composed of combined carbon and graphite carbon, when the combined carbon is 0.8%, it belongs to pearlite gray cast iron; When the combined carbon is less than 0.8%, it belongs to pearlitic ferritic gray cast iron; When all the carbon exists in the state of graphite, it is ferritic gray iron.