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。
2
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。
3
Therefore, the main process parameters of casting have been optimized using orthogonal design, thus obtaining high-quality castings without chill layer.