. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . stj gives the following as the days burden of A blast fur-nace at the Maryland Steel Company: Tons. El Ciicio ore NicolaiofT ore Siena .Morenn ore Coke Limestone Dolomite The records of the ore analyses were as follows: Iron, natural Iron, dried at 212° F. Moisture Silica Manganese Phosphorus Sulphiu- El Cuero. Per cent. .32 .017 Xicolaieff Per 65. 75 .13 .017 trace No nickel
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . stj gives the following as the days burden of A blast fur-nace at the Maryland Steel Company: Tons. El Ciicio ore NicolaiofT ore Siena .Morenn ore Coke Limestone Dolomite The records of the ore analyses were as follows: Iron, natural Iron, dried at 212° F. Moisture Silica Manganese Phosphorus Sulphiu- El Cuero. Per cent. .32 .017 Xicolaieff Per 65. 75 .13 .017 trace 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. t Report to Rail Committee, Proceedings Am. Ry. Eng. & M. of W. Assn., Vol. 12, Part 2, 1911. 364 STEEL RAILS the Gary works. Lake Superior ore was used, reduced in blast furnaces usingordinary air and having the following average charge:. f Shell PLAN. SECTION. Fig. 248.—300-ton Mixer. E, Filler; E. Pouring Spout. (Harbord and Hall.) A mixture of ores was used, but consisted largely of Chapin ore, showinganalysis as follows: Per cent. Iron o4. (53 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 .53 .74 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 vaiytoo 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
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