The traditional technique of internal Iron chill of steel castings hasn'tsatisfied with requirements of flaw detection quality of mill housings.
对于有探伤要求的轧机牌坊，采用传统的内冷铁工艺生产铸钢件的技术已不能满足质量要求。
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。
Therefore, the main process parameters of casting have been optimized using orthogonal design, thus obtaining high-quality castings without chill layer.
本研究通过正交试验对基本工艺参数进行优化组合，得到无白口的优质铸件。
Therefore, the main process parameters of casting have been optimized using orthogonal design, thus obtaining high-quality castings without chill layer.
本研究通过正交试验对基本工艺参数进行优化组合，得到无白口的优质铸件。
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