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高 張 友 夫**・山 本 佳 博** Determination of Sulfur, Silicon, Nickel, Chromium and Cobalt in Ferro-nickel Containing High Carbon by X-ray Fluorescent Analysis Tomoo TAKAIIARI and Yoshihiro YAMAMOTO Synopsis: A study has been made, by using the Shimazu-ARL X-ray quantometer , on the analytical precision of S,Si, Ni, Cr, and Co in Ferro-nickel containing high carbon as a raw material for stainless steels. Samples are prepared by pouring the melt into a metallic mold and grinded with No.80 emery paper after cutting them. No segregation of the above elements are found regardless of the high carbon content (2%<) in the sample. The multiple linear regression method is employed to improve the analytical precision of S, Si, Ni, Cr and Co. Si and C effect the determination of S. The precision and reproducibility of the above elements are as follows: