It could guarantee the quality of battery and reduce the cost of raw material effectively when the ratio of acetylene black and graphite in soil form was 2∶1 or the ratio of electrolytic manganese dioxide(EMD) and natural manganese dioxide(NMD) was 2∶1.

It is justified by the observed results that non-metallic inclusion can act as the heterogeneous nuclei of nodular graphite in this paper.

Combining with the results of implant test,the conclusion that the main reason of dropping the strength of Austenite zone is the micro\|crack located in the tip of flake graphite and Marten site is drawn.

Adding different alloy combination of RE, copper and titanium, then through gestation and nodulizing disposal, we got the fine texture of ferrite pearlite and spheroidal graphite.

Spheroidal graphite can be observed in the region approaching surface of the smaller section size gray iron bars by continuous cast The experiment shows that spharical graphite may crystallize in commercial gray cast iron with suitable chemical composition under certain cooling rate This phenomenon can be explained by the mechanism of diffusion controlled growth of graphit

The fracture behaviour of cast irons with graphite irregularity S=0 and spheroidal graphite iron under three different stress modes was investigated.

Before and after the process of heating to grahitization temperature 2770K, the structure of powdered graphite treated with acid and acid base was analysed by X ray diffraction line profile method.

From the measurements of chemical analysis and X-ray diffraction of KRG W1 powdered graphite, it is found that this graphite has not only a high degree of graphitization and a fixed carbon content of up to 99 99%, but also contains a certain quantity of rhombohedral graphite.

The function of alloy elements in dot graphite alloy cast iron is presented, and the effect of alloy elements on heat analysis curve of dot graphite alloy cast iron is discussed.