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Full text of "Metallurgy Of Cast Iron"

CONTRACTION   VS.   STRENGTH   OF   CAST   IRON.       453
DETERMINATION No. 2.—Sulphur in chill roll iron: At the center of fracture in one-half inch square, . 046 per cent. ; one inch square, .044 per cent.; one and one-eighth inch round, .046 per cent. In light machinery iron: At the center of fracture in one-half inch square bar, .0819 per cent.; one inch square, .079 per cent.; one and one-eighth round, .0825 per cent. Mr. Bauer writes that the difference in sulphur at the cen- * ter and the corners of the different bars is not perceptible.
DETERMINATION No. 3.—Combined carbon in chill roll iron: In one-half inch square, 2.700 per cent.; one inch square, 1.416 per cent.; one and one-eighth inch round, 1.250 per cent. Difference in the extreme of the combined carbon in the one-half inch square and one and one-eighth inch round bar, 1.450 per cent. In light machinery iron: In one-half inch square, .854 per cent.; one-inch square, .650 per cent.; one and one-eighth inch round,. 7 04 per cent. Difference in extremes, .204 per cent, of the combined carbon in the one-half inch and one and one-eighth inch round test bars at their center of fracture. The silicon in the light machinery is 1.83 per cent.; in the chill roll, . 71 per cent.
The percentage of combined carbon and " iron " in a casting, etc., chiefly controls the strength of the iron and also its contraction. The percentages of sulphur, silicon, manganese and phosphorus in cast iron are but factors in connection with the time it takes a test bar or casting to solidify and become cold, determining the degree to which the carbon takes the combined form.
The above analyses plainly prove that a slight difference in the fluidity of metal, or dampness in the.2,S"