Owing to certain inexplicable failures of tires, The Standard Steel Works authorized us to make a series of experiments to determine, if possible, the cause of the trouble. As a result of numerous analyses and physical tests, both from defective and experimental tires, we are able to present the following facts concerning piping and segregation, … Read more
Results of cooling steel slowly from different high temperatures are given in Tables 18, 20, 23, 24, and 25, groups VII. and VIII. In some cases (group VII.) this slow cooling was complete; in others it was interrupted by again raising the temperature, and after this the slow cooling was resumed. Bars marked T closed … Read more
The Hardening Power Apparently Lags In the cooling- curves of the five series of steel which we have just discussed, running from the softest basic steel to very high-carbon tool-steel, we note that each has a marked retardation which reaches a maximum in the neighborhood of 660° C. (1220° F.). These we may temporarily class … Read more
This paper may be regarded as a report of progress of an investigation into the influence of prior exposure to different high temperatures, under different conditions, on the properties of steel after it has been cooled completely. The following are the chief divisions: II. —Experiments on toughening manganese-steel by sudden cooling. III. —A study of … Read more
In working brown iron-ore mines on the system employed at Longdale, namely, stoping from the top down, the usual procedure is to drive a succession of upraises from the lowest adit to the highest, or to the top of the deposit, as the case may be. These upraises are usually driven 120 feet apart, along … Read more