Metallurgy Of Cast Iron

THE A, F, A. COMMITTEE'S REPORT.
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FIG. 152.—STEEL SOCKET FOR TENSILE TEST OF CAST IRON. Two required. Test pieces should fit in loosely.
FIG. 153.—STANDARD TEST BAR FOR CAST IRON. Cross Section equals % square inch.
7. The dimensions of the test bars shall be as given herewith. There is only one size for the tensile bar and three for the transverse. For the light and medium weight of gray iron castings the i^-inch D bar is to be used, for heavy gray iron castings the 2-inch D, and for chilling irons the 2%-inch D test bar. These bars are seen in Figs. 151, 152, and 153.
8. Where the chemical composition of the castings is a matter of specification in addition to the physical tests, borings shall be taken from all the test bars made, well mixed, and any required determination, combined carbon and graphite alone excepted, made therefrom. *
*NOTE.— There should really be no necessity for this test, for the requirements of the physical tests presuppose a given chemical composition. It may, however, sometimes be expedient to know the total carbon, silicon, sulphur, manganese, and phosphorus of a casting to insure good service conditions.specially brtMiv plaein;.'; the eoi»traet, and two of tin.' bars shall nif'H t hf TVCJII iivnn-nt s,