The Iron and steel magazine . visible flaw. These tests are shown diagrammati-cally by Fig. 1. The average dimensions of the tensile test-pieces emploA^edwere f inch in diameter by 2 inches parallel. Maximum stressincreases fairly gradually up to D, and at the same time ductility Iron Nickel Manganese-Carbon Alloys 103 doc-; not seriously decrease. For some reason no1 yet apparentthe ductility of H is less than thai ol C. The abrtipl chaibetween I) and E noted in the bending is further emphasized inthe tensile tests, and it will be noted that an increase in nickel per cenl raises the maxi
The Iron and steel magazine . visible flaw. These tests are shown diagrammati-cally by Fig. 1. The average dimensions of the tensile test-pieces emploA^edwere f inch in diameter by 2 inches parallel. Maximum stressincreases fairly gradually up to D, and at the same time ductility Iron Nickel Manganese-Carbon Alloys 103 doc-; not seriously decrease. For some reason no1 yet apparentthe ductility of H is less than thai ol C. The abrtipl chaibetween I) and E noted in the bending is further emphasized inthe tensile tests, and it will be noted that an increase in nickel per cenl raises the maximum stress some tons per squar<inch, at the same time decreasing the elongation by c8 per has disappeared entirely in F, which gives the maxi-mum tensile strength of the series. K, per cent nickel, ischaracterized by the lowest yield point, the highest elongationand reduction of area of the series. This steel, remarkable in Fig. 2—Tensile TeeU. Elongation, Reduction of Area, and Twi6ting 10 15 NLcheL J>er cent. many respects, derives its chief interest here from the fact thatan ultimate stress of tons per square inch is associated withan elongation of 55 per cent on 2-inch. The foregoing tensileresults are plotted on three separate curves. (See Figs. 2, 3 and4.) The yield points noted in tension are plotted on Fig. maximum stress curve plotted on Fig. 4 specially emphasizessteel F, and at the same time shows the influence of an ascend-ing content of nickel. Finally, both tensile and bending tests show that the seriesof steels may be roughly divided into two groups, one includingductile and the other brittle steels. Up to 4J per cent nickel,ductility is fairly high; per cent nickel marks an accession 104 The Iron and Steel Magazine of brittleness, whilst per cent nickel denotes the return ofductility. This return is complete at per cent nickel. Compression tests were made on cylinders .35 inch indiameter by .
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Keywords: ., bookcentury1800, bookdecade1890, bookidironsteel, booksubjectiron
