. Transactions. a h Fil;. 47.—Rolled electric-fuuxace and open-hearth silico-maxoanese steel. a Electric steel, b Open-hearth steel. X 500. Etched with 2 per cent, nitric acid in Fig. 48.—Normalized electric-fTjRNAce and open-hearth silico-manga-NESE steels, a Electric steel; b Open-hearth steel. 1800° F., oil; 1650° X 100. Etched with 2 per cent, nitric acid in alcohol. heats, as shown in Figs. 6 and 7, is similarly shown for the normalizedspring steels first quenched from a high temperature, in Figs. 48 a and in structure persist in these alloy steels when they
. Transactions. a h Fil;. 47.—Rolled electric-fuuxace and open-hearth silico-maxoanese steel. a Electric steel, b Open-hearth steel. X 500. Etched with 2 per cent, nitric acid in Fig. 48.—Normalized electric-fTjRNAce and open-hearth silico-manga-NESE steels, a Electric steel; b Open-hearth steel. 1800° F., oil; 1650° X 100. Etched with 2 per cent, nitric acid in alcohol. heats, as shown in Figs. 6 and 7, is similarly shown for the normalizedspring steels first quenched from a high temperature, in Figs. 48 a and in structure persist in these alloy steels when they arequenched and tempered in the ordinary manner and also when subjectedto special heat-treatments, as shown in Fig. 49. In each case the electric-furnace and open-hearth heats were treated simultaneously and in the 364 EFFECT OF QUALITY OF STEEL OX CASE-CARBURIZING RESULTS *?^e * fi?^ -h/^ii y^
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