Quality Control Measures of the Heavy Section Ductile Iron Casting
Since heavy section ductile iron casting is easy to suffer from these defects such as the nodular graphite coarsening, reduction of the nodular graphite, graphite floating, deformation of nodular graphite which leads to engender exploded graphite and chunk graphite, itd production technology is a recognized as a troublesome problem in the field of casting industry. Combined with current production status of heavy section ductile iron castingsat home and abroad, a series of quality control measures is summarized in this paper, forexample, shortening cooling time, strictly controlling composition, adding the trace elements Bi and Sb, using proper nodularizer and inoculant.In the process of production, the heavy sectionductile iron casting could be obtained with good external and internal quality by adopting these quality control measures.