The role of trace elements Bi, Pb, Sb, Ti, As, etc. in the post-large cross-section ductile iron is also not negligible.
The role of trace elements Bi, Pb, Sb, Ti, As, etc. in the post-large cross-section ductile iron is also not negligible. When ductile iron is treated with pure magnesium, these elements are often treated as interfering elements, requiring strict limits on their content. When the ductile iron is treated with rare earth magnesium, the limit of these trace elements is relaxed due to the neutralization of the rare earth elements, and the interaction of the rare earth and these elements can even increase the spheroidization level and increase the number of graphite balls.
铋 (Bi) and 锑 (Sb) used to be considered as interfering elements. However, recently, the sub-bovine showed that Bi and Sb were added to the molten iron within a certain range, and it could react with rare earth elements to form a stable high melting point compound, which was beneficial to the heterogeneous nucleation of the spheroidal ink. Moreover, they are easy to form an enveloping layer around the spheroidal ink, which can effectively prevent the distortion and growth of the spheroidal ink from reducing the degree of spheroidal distortion, and increase the amount of spheroidal ink and the spheroidization rate.
Nanjing Ningbo Analytical Instrument Co., Ltd. Technology Department
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