. Transactions. Fia. 1.—Keheated to 749^ Fig. 2.—Reheated to 771° C. perature to convert combined carbon completely to graphitic this is true, it follows that the complete conversion regularly obtainedin properly annealed malleable castings must, of necessity, take place inits final stages either at or below this critical temperature. Vol. lxvii.—29 450 GRAPHITIZATION OF WHITE CAST IRON Graphite versus Carbide Equilibrium Whether the completion of graphitization takes place at or below adefinite critical temperature is a question of importance. If, as main-tained by some of the w

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. Transactions. Fia. 1.—Keheated to 749^ Fig. 2.—Reheated to 771° C. perature to convert combined carbon completely to graphitic this is true, it follows that the complete conversion regularly obtainedin properly annealed malleable castings must, of necessity, take place inits final stages either at or below this critical temperature. Vol. lxvii.—29 450 GRAPHITIZATION OF WHITE CAST IRON Graphite versus Carbide Equilibrium Whether the completion of graphitization takes place at or below adefinite critical temperature is a question of importance. If, as main-tained by some of the writers quoted, the complete conversion to graphitetakes place at this critical temperature and not below it, such conversionmust consist in the direct precipitation of an iron-graphite if the conversion took place simultaneously with the formation ofpearUte, there is no reason to suppose that it would not continue attemperatures slightly below the critical. Table 2.—Solubility of Graphite in Iron Test No. AnnealingTempe

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