. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . ickhorstf gives the following as the days burden of A blast fur-nace at the Maryland Steel Company: Tons. El Cuero ore Nicolaieff ore Sierra Morena ore Coke Limestone Dolomite The records of the ore analyses were as follows: El Cuero. Nicolaieff. Iron, natural Iron, dried at 212° F Per Per cent. Sulphur No nickel, cobalt, copper or chromium in either one.
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . ickhorstf gives the following as the days burden of A blast fur-nace at the Maryland Steel Company: Tons. El Cuero ore Nicolaieff ore Sierra Morena ore Coke Limestone Dolomite The records of the ore analyses were as follows: El Cuero. Nicolaieff. Iron, natural Iron, dried at 212° F Per Per cent. Sulphur No nickel, cobalt, copper or chromium in either one. The metal from the blast furnace was poured into an 85-ton receiver, fromwhich it was weighed and poured into an 18-ton converter. The same authority gives the following for the blast-furnace practices at * Railway Age Gazette, August 19, 1910. f Report to Rail Committee, Proceedings Am. Ry. Eng. & M. of W. Assn., Vol. 12, Part 2, 1911. STEEL RAILS the Gary works. Lake Superior ore was used, reduced in blast furnaces usingordinary air and having the following average charge: ,000 5,10026,500. Shell PLAN. SECTION. Fig. 248.—300-ton Mixer. E, Filler; H. Pouring Spout. (Harbord and Hall.) A mixture of ores was used, but consisted largely of Chapin ore, showinganalysis as follows: Per cent. Iron 54. 63 Aluminum (about) 2. 00 Manganese .21 Phosphorus 059 Sulphur trace Silica (SiO») INFLUENCE OF DETAIL OF MANUFACTURE 365 The limestone used analyzed about aS follOWS: Percent. Calcium oxide Magnesium oxide Iron and aluminum . The iron from the blast furnaceswas poured into a mixer, from whichit was weighed. The direct process is one by whichthe steel is made from the ore in oneoperation. In ordinary coke blast-furnace practice successive casts varytoo much in Si and S to allow of takingthe metal as it flows from the furnaceinto ladles and from them to the con-verter or open-hearth furnace. It is,therefore, poured first in
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