本文提出了球铁“一次出铁水处理法”及其机理的初步探讨。并和普遍采用的二次出铁水处理法进行了比较。同时经该厂两年多的生产实践,证明一次处理法可消除大截面球铁曲轴夹渣,其成品率为99．35%。前言国内大截面球墨铸铁夹渣缺陷很难消除,一般流行的观点认为球铁产生夹渣缺陷的主要原因是铁水的“二次氧化”所致。但我厂多年来的生产实践证明,采用着眼于防止处理后球铁水“二次氧化”的一系列措施,并未彻底消除夹渣缺陷。1979年以前,我厂4160A柴油机球铁曲轴(曲轴直径为φ150实心。长为1520,毛坯重量约300公斤)。因夹渣缺陷磁力探伤 This paper puts forward a preliminary discussion on the “out of the hot metal treatment method” of ductile iron and its mechanism. And compared with the commonly used secondary tapping method. At the same time, the plant more than two years of production practice proved that a treatment method can eliminate large-area ductile iron crankshaft slag, the yield was 99.35%. Preface Domestic large cross-section of ductile iron slag defects is difficult to eliminate, the prevailing point of view that the ductile iron ductile defects caused by the main reason is the “secondary oxidation of molten iron” due. However, our factory’s production practice over the years has proved that with a focus on preventing the treatment of hot metal “secondary oxidation” a series of measures, did not completely eliminate the slag defects. Before 1979, our factory 4160A diesel ductile iron crankshaft (crankshaft diameter φ150 solid. Length 1520, rough weight about 300 kg). Due to slag magnetic flaw detection