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在较小截面的连铸灰铸铁型材表层，观察到具有球状石墨的金相组织；经过试验证明，在一定冷却条件下，未经处理过的灰口铁液也可能析出球状石墨。认为这种现象是石墨生长受扩散控制的结果。
In the smaller section of continuous casting gray cast iron profile surface, the microstructure with spherical graphite was observed. It was proved through experiments that spheroidal graphite could be precipitated in untreated gray iron liquid under certain cooling conditions. This phenomenon is thought to be the result of proliferation control of graphite growth.