Both the chill and reverse chill are defects often found in the nodular iron knucle castings.

白口和反白口缺陷是球铁件转向节的常见缺陷。

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Too high residual magnesium content, and especially too high residual rare earth content is the main reason causing reverse chill defect. So them…

引起反白口的主要原因是残余镁量，特别是残余稀土量过高，防止措施是采用稀土含量较低的球化剂，提高球化处理温度和浇注温度。

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