Identifier: railroadengineer62newy (find matches)
Title: The railroad and engineering journal
Year: 1887 (1880s)
Authors:
Subjects: Railroad engineering Engineering Railroads
Publisher: New York : M.N. Forney
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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possess hardness and a high capacity of resist-ance, such as rolls for rolling-mills, etc. ; but in such acase it would be necessary to limit the percentage of car- CHROME STEEL. In the manufacture of steel, one can matce use of veryvariable proportions of chromium. Thus, for example,we have ascertained that a metal containing 2 per cent, ofcarbon and 13 per cent, of chromium may be forged,and may be classified under the head of steel. The presence of chromium in steel increases its resist-ance or tenacity. Thus, in two varieties of steel havingthe same percentage of carbon, and differing only fromeach other in so far as the first contains chromium andthe second none, the first will have, besides, a notablyhigher tenacity, as well as a considerably higher resistanceof pressure. Steel containing chromium, and properlyannealed, will always be a little harder to work in thelathe or on the surface, and the difference in this respectwill be increased according as the percentage of chromium
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LOB GHYLL VIADUCT, YORKSHIRE, ENGLAND, bon, as chrome iron with a high percentage of carbon ap-pears to be always brittle. Chromium appears to have little tendency to combinewith copper, with a view to the production of bronze. Ina specimen showing the results of an experiment made inorder to obtain a chromium bronze, the fracture of the barindicates a great absence of homogeneity in the metal ob-tained. The ordinary ferro-chrome contains usually from 48 to53 per cent, of chromium, and from 7 to 8 percent, of car-bon. With this composition, ferro-chrome combines withvariable proportions of silicon, often exceeding 2 per cent. Specimens of silico-chrome contain 47 per cent, ofchromium, 7 per cent, of carbon, and 5.4 per cent, ofsilicon, is raised. This property renders chrome steel less suitedto the manufacture of articles that require a complicatedmechanical finish, such, for example, as milling tools. Chrome steel contains usually from 1.5 to 2 percent, ofcarbon, as noted above. If t

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