Engineering Steels: An Exposition of the Properties of Steel for Engineers and Users to Secure Economy in Working and Efficiency of Result

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Macdonald & Evans, 1921 - Steel - 396 pages
 

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Page 39 - Hardening. — Hardening means heating a steel to its normalising temperature, and cooling more or less rapidly in a suitable medium, eg water, oil or air.
Page 404 - ... complete stock or at short notice, Any Technical or Scientific Book In addition to publishing a very large and varied number of SCIENTIFIC AND ENGINEERING BOOKS, D. Van Nostrand Company have on hand the largest assortment in the United States of such books issued by American and foreign publishers. All inquiries are cheerfully and carefully answered and complete catalogs sent free on request.
Page 39 - Normalising means heating a steel (however previously treated) to a temperature exceeding its upper critical range, and allowing it to cool freely in air. It is desirable that the temperature...
Page 116 - ... when using dividers; or at which, when the load is increased at a moderately fast rate, there is a distinct drop of the testing machine lever or, in hydraulic machines, a hesitation in the movement of the gauge finger.
Page 91 - The Brinell hardness number is the load in kilograms, divided by the area of the spherical surface of the impression in square millimetres — so that the smaller the impression, the larger is the Brinell number. By the comparison of the results of a large number of tensile and Brinell tests, a distinct relationship between the Brinell hardness number and the maximum stress of the steel has been established, with a reasonable degree of accuracy.
Page 98 - The test is to be made in a square-nose vice, the edges over which the specimen is bent being rounded to a radius equal to three times the thickness of the sheet. Selection of Test Specimens.
Page 39 - Tempering. Tempering means heating a steel (however previously hardened) to a temperature below its carbon change point, with the object of reducing the hardness or increasing the toughness to a greater or less degree.
Page 107 - The elastic limit is the point at which the extensions cease to be proportional to the loads. In a stress/strain diagram plotted to a large scale it is the point where the diagram ceases to be a straight line and becomes curved.
Page 98 - The projecting end of the strip is then to be bent at right angles to the fixed part, first to one side, then to the other, for a number of times till it breaks. The strip must stand without cracking at least three such reversals. The first bend through 90 is not counted.
Page 116 - ... at which a distinctly visible increase occurs in the distance between the gauge points on the test piece observed by using dividers.

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