. Transactions. ows considerable segregation. While the tabulatedladle analyses probably represent the average composition of the steel,under such conditions of manufacture variations in individual plates areto be expected, depending on the portion of the ingot from which theywere obtained. A record of original ingot size, together with amount of reduction re-ceived during rolling, is shown in Table 2: Table 2 Series Grade OriginalWgt., Lb. Ingot Size,Inches Reductionin Rolling PattnrnSize, Inches Firebox, 1 52,000 to 62,000 lb. tensile strength Marine, 5,900 36X15 30 to 1 36X18 2 60,000 to 70
. Transactions. ows considerable segregation. While the tabulatedladle analyses probably represent the average composition of the steel,under such conditions of manufacture variations in individual plates areto be expected, depending on the portion of the ingot from which theywere obtained. A record of original ingot size, together with amount of reduction re-ceived during rolling, is shown in Table 2: Table 2 Series Grade OriginalWgt., Lb. Ingot Size,Inches Reductionin Rolling PattnrnSize, Inches Firebox, 1 52,000 to 62,000 lb. tensile strength Marine, 5,900 36X15 30 to 1 36X18 2 60,000 to 70,000 strength 3,650 32X12 24 to 1 36X12 Form of Test Bar Patterns 36 in. by 18 in. or 36 in. by 12 in., as shown in Table 2, weretaken from the rolled plates, but unfortunately no record of their locationwith respect to the ingot is available. Flat test bars of the form anddimensions shown in Fig. 1 were cut from these patterns, the long dimen-sion in each case being taken in the direction of Fig. 1.—Flat test bars, long dimension being taken in direction of rolling. Apparatus for Determination of Proportional Limit The apparatus used in the determination of the proportional limitat various temperatures is shown in Fig. 2, It consists primarily of twoaluminum-alloy frames each rigidly fastened to a quenched and tempered H. J. FRENCH 89 steel yoke (shown in Fig. 3) by two annealed, low-carbon steel specimen passes freely through the holes in the base of each ofthe frames. The yokes are clamped to the specimen by three quenched and tem-pered high-speed steel screws. The tendency for the yoke to spread when considerable force is used in settingthe screw is overcome by an additionalbolt. The flanges on the upper frameare so arranged that two Ames dialsmay readily be securely fastened tothem while those of the lower frame arecapped with polished steel plates to givea smooth bearing surface to the pistonsof the dials. The smallest division on the dial
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
