. Transactions. has thesame proportions of carbon, manganese, phosphorus, sulfur, and siliconas an electric-furnace product and both alloys are hardened in the samemanner, they regularly require different tempering temperatures toproduce the same Brinell hardness. Samples of typical electric-furnace and open-hearth heats of suchspring steels were obtained and subjected to various heat compositions and tensile-test results are given in Tables 1 and 2,while typical microstructures are shown in Figs. 47, 48, and 49. It will be noticed that the difference in structure between rolled
. Transactions. has thesame proportions of carbon, manganese, phosphorus, sulfur, and siliconas an electric-furnace product and both alloys are hardened in the samemanner, they regularly require different tempering temperatures toproduce the same Brinell hardness. Samples of typical electric-furnace and open-hearth heats of suchspring steels were obtained and subjected to various heat compositions and tensile-test results are given in Tables 1 and 2,while typical microstructures are shown in Figs. 47, 48, and 49. It will be noticed that the difference in structure between rolledelectric-furnace and open-hearth silico-manganese steels (Figs. 47 a and b) * Physicists, Bureau of Standards. DISCUSSION 363 are much like those observed in the hj^pereutectoid zone of carburizednormal (electric-furnace) and abnormal (open-hearth) steels shown inFigs. 1 and 2. The greater continuity of the excess ferrite of the normal carbon(electric-furnace) steel when compared with the abnormal (open-hearth). 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 alcohol.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
