Difficulty had been encountered in the determination of magnesium in ductile iron by point to plane methods because tiny eruptions in the burn caused irregularities and non-reproducible results on the vacuum spectrometer. Investigation showed that magnesium sulfide, formed from treatment magnesium and residual sulfur, floating slowly upward, was the probable cause. A teaspout ladle was used and, after pouring the molten iron into a can-like hand ladle lined with fireclay for the sample, gave iron free of these defects.
MorroughH. and WilliamsW. J., J. Iron Steel Inst.158, 306 (1948).
2.
GagnebinA. P.MillisK. D., and PillingN. B., Iron Age (17 Feb. 1949).
3.
DonohoC. K., Amer. Foundryman33 (Feb. 15, 1949).
4.
VennerholmG.BogartH., and MelmouthR., Trans. Amer. Foundrymen's Soc.58, 174 (1950).
5.
RehderJ. E. and DonohoC. K., Symposium on Nodular Graphite Cast Iron; Trans. Amer. Foundrymen's Soc., MaloneyW. W., Sec.; Amer. Foundrymen's Soc., Chicago, Ill., 1949, Vol. 57, p. 386—Discussion.
6.
MichaelisR. E. and WymanL. L., Preparation of NBS White Cast Iron Spectrochemical Standards, National Bureau of Standards Misc. Publ. 260–1, Superintendent of Documents (U. S. Gov't. Printing Office, Washington, D. C., 1964), pp. 9–12, Fig. 1.
