《Table 9:Typical content of main and trace elements of ultra-high purity pig iron (wt.%)》

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《Selection of raw materials and control of trace elements for production of high-quality SG iron》

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Gundlach suggested that when K1<1.0，spheroidal graphite is possible；when K1>1.0，degenerate graphite is likely to be formed，and rare earth additions are required to neutralize the effect of deleterious trace elements[13].Tables 1 to 5 show the final maximum content of trace elements in SG iron according to the literature.Table 1 shows only the maximum levels of Sb，As and Pb，by D.S.White of Elkem[11].It can be seen that the maximum levels of these elements have decreased significantly during a period of 40 years.