File:Transactions (1871) (14762049916).jpg

Identifier: transactionsmining53amer (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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
ry, it can besafely stated that these larger furnaces show a saving in the cost of opera-tion and repairs over the smaller ones. We are indebted to Dr. Schusterfor a valuable paper read at the May, 1914, meeting of the British Ironand Steel Institute, in which he published the results obtained whenworking with different sizes and types of furnaces under identical condi-tions. As a result of experiments, covering a working period of 12months, he has been able to establish conclusively that: (1) The quality of steel produced is both physically and chemicallyindependent of the type of furnace employed. (2) The yield is practically the same whenever the same conditionsare observed in furnaces of different types. (3) Although the actual first cost of the 200-ton furnace is higherthan the cost of the tilting furnace of smaller capacity, or of a stationaryopen-hearth furnace, this cost, calculated on the daily tonnage produced,works out most favorably for the 200-ton furnace. F. F. LINES 359
Text Appearing After Image:
- rv-t ■ X LJ Q_ o 5o < ^^ 2^ O </) h- 2 ^- H 12; o Cm (/) mo UJ o <. « ^1 < or cu r) UJ u. ^ o X U 1— Cd Ui < w UJ H X (7J z Q LU -<1 Q- 1^ O tH < o CL H ;?: Eh K < o o O PS <! 360 DUPLEX PROCESS OF STEEL MANUFACTURE (4) The fuel consumption is lower in the 200-ton furnace than in theother furnaces. (5) The life of the refractory lining is longer in the 200-ton furnace. (6) The labor of operating is less in the 200-ton furnace. At the plant to be described, the following points decided the adoptionof the duplex process: This plant was originally built to manufactureBessemer steel rails, the blast furnaces and steel department being pro-portioned accordingly; the soaking pits in the rail mill were designed totreat the steady stream of hot ingots produced by the Bessemer process.To be able to supply open-hearth steel in place of Bessemer steel, theduplex process was adopted, using five 50-ton tilting furnaces, emptiedat each heat. It was

Note About Images