Abstract
A new method for fast predicting the graphite shape of cast iron by surface tension has been put forward, and the surface tension can be fast measured by the self-developed device. Through experiments and statistical analysis, the criterion of fast predicting graphite shape by the surface tension has been established. When the surface tension is below 990 mN . m^-1, between 990 mN . m^-1, and 1108.mN . m^-1, between 1108 mN . m^-1, and 1283 mN.m^-1, between 1283 mN . m^-1, and 1385 mN . m^-1, and above 1385 mN . m^-1, the graphite shape is all flake, vermicular and flake, vermicular, nodular and vermicular, and all nodular, respectively.

Key words
fast prediction, graphite shape, surface tension, criterion

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