. Transactions. Fig. 49.—Quenched and tempered electkic-eurnace and open-he.\rth silico- MANGANESE STEELS. O ElECTRIC STEEL. X 100. h OpEN-HEARTH STEEL. X 100. c Electric STEEL. X 500. d Open-hearth steel. X 500. 1650° F., oil; 650° F.,\iR. e Electric steel. X 100. / Open-hearth steel. X 100. g Electricsteel. X 500. h Open-hearth steel. X 500. 1800° F., oil; 1650° F., oil;650° F., air. Etched with 2 per cent, nitric acid in alcohol. MSCtJSSIOM 365 same manner. Pliotoniicrographs a and h sliow (he more regular andcomplete ferrite envelopes existing in the electric-furnace product forsteels quen

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. Transactions. Fig. 49.—Quenched and tempered electkic-eurnace and open-he.\rth silico- MANGANESE STEELS. O ElECTRIC STEEL. X 100. h OpEN-HEARTH STEEL. X 100. c Electric STEEL. X 500. d Open-hearth steel. X 500. 1650° F., oil; 650° F.,\iR. e Electric steel. X 100. / Open-hearth steel. X 100. g Electricsteel. X 500. h Open-hearth steel. X 500. 1800° F., oil; 1650° F., oil;650° F., air. Etched with 2 per cent, nitric acid in alcohol. MSCtJSSIOM 365 same manner. Pliotoniicrographs a and h sliow (he more regular andcomplete ferrite envelopes existing in the electric-furnace product forsteels quenched from 1650° F. and tempered at 650° F. When thesealloys were first subjected to a normalizing quench and then treated asabove, the structures shown in g and h were obtained. It is evident from these photomicrographs that the structures obtainedin the heat treatment of the electric-furnace spring steel are differentfrom those obtained after application of the same treatments to the open-hearth steel

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries