. Transactions. high sulfur. Fig. 3, reveals more enclosures than the electric steelwith low sulfur. Photomicrographs of Open-hearth and Electric Steel Photomicrographs have been taken of bars picked at random fromeach of the three classes of steels described. The polished surface ofthese bars was parallel to the direction of forging. One set of photo-micrographs was taken at 25 diameters, so as to include as many enclo-sures as possible and to show their distribution. A second set was WILLIAM J. PRIESTLEY 323 taken at 200 magnifications, to show the formation of the will be note
. Transactions. high sulfur. Fig. 3, reveals more enclosures than the electric steelwith low sulfur. Photomicrographs of Open-hearth and Electric Steel Photomicrographs have been taken of bars picked at random fromeach of the three classes of steels described. The polished surface ofthese bars was parallel to the direction of forging. One set of photo-micrographs was taken at 25 diameters, so as to include as many enclo-sures as possible and to show their distribution. A second set was WILLIAM J. PRIESTLEY 323 taken at 200 magnifications, to show the formation of the will be noted that the non-metalhc enclosures in the steel with lowsulfur and highest elongation and reduction of area are smaller than in thesteel with higher sulfur content and the lowest elongation and reductionof area. All the enclosures in the low-sulfur steel seem to be of the samekind, whereas, in the acid open-hearth and electric steel with highersulfur, there are two types—the small round ones and those that were. a b Fig. 1.—Acid open-hearth steel, a, Unetched, X25; h, uxetched, X200. elongated and drawn out in forging. The light colored elongatedenclosures in the acid open-hearth steel are probably a mixture of man-ganese sulfide, oxides, and siUcates. Fig. 1 shows a longitudinal section taken from an acid open-hearthsteel forging 11 in. in diameter, 28 ft. long, 7>^ in. bore, weighing 6000 the following chemical analysis: Carbon per cent., per cent., silicon per cent., phosphorus per cent., per cent., nickel per cent. Physical tests on tangential testbars gave the following results: 324 EPPECT OF SULFUR AND OXIDES IN ORDNANCE STEEL Tensile Elastic Strength, Limit, Elongation Reduction Lb. Per Lb. Per in 2 In., in Area, Sq. In. Sq. In. Per Cent. Per Cent. Fracture BM 101,700 75,600 Woody BI 101,500 77,300 One-half cup woody MO 96,800 65,200 Woody, streaked MM 97,100 63,400 I
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
