石墨漂浮 carbon flotation，在球墨铸铁件纵断面的上部，一层密集的石墨黑斑。和正常的银白色断面组织相比，有清晰可见的分界线。金相组织特征为石墨球破裂，同时缺陷区富有含氧化合物和硫化镁。
碳当量高是引起石墨漂浮的主要原因。
The increase of carbon equivalent is primary reason for graphite floatation.
研究了石墨漂浮对球铁机械性能的影响规律。
The effect of graphite floatation on mechanical property of nodular graphite cast iron was studied.
采用金相观察法研究了球墨铸铁炉前快速金相球墨大小不均与石墨漂浮的关系。
The relation between uneven nodular graphite in size on blast - furnace rapid metallograph and graphite floatation was studied by observing metallograph.
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