File:Transactions (1871) (14579618978).jpg

Identifier: transactionsmining67amer (find matches)
Title: Transactions
Year: 1871 (1870s)
Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers
Subjects: Mineral industries
Publisher: New York (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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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 lb..having the following chemical analysis: Carbon 0.35 per cent., manganese0.68 per cent., silicon 0.240 per cent., phosphorus 0.040 per cent., sulfur0.053 per cent., nickel 3.00 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 18.1 36.8 Woody BI 101,500 77,300 20.5 38.6 One-half cup woody MO 96,800 65,200 18.1 32.4 Woody, streaked MM 97,100 63,400 18.0 37.1 Irregular, woody Required by speci-fications 90,000 55,000 18.0 30.0
Text Appearing After Image:
Fig. 2.—Electric steel with low sulfur. X200. Unetched, X25; b, unetched, This forging was green annealed at 1600° F., rough machined andquenched at 1450° F., and drawn to 1200° F. The elongated enclosuresor shreds follow the direction of forging. A tensile bar taken transversely,or across, these enclosures will show a lower elongation and lower reduc-tion of area than if these impurities were not present. No aluminum wasadded to this steel in the open hearth. This enclosure is much lighterthan that in the electric steel. It did not pull apart in forging and appearsto have been more plastic and probablj^ contains more manganese sulfidethan cither of the other two specimens, Figs. 2 and 3, WILLIAM J. PRIESTLEY 325 In Fig. 2 is shown a longitudinal section taken from a low-sulfurelectric steel forging 11 in. in diameter, 28 ft. long, 73^ in. bore, weighing6000 lb., having the following chemical analysis: Carbon 0.28 per cent.,manganese 0.74 per cent., siHcon 0.140 per cent., phosph

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