Transactions . ery small initial elongation and contraction of area, and per cent, respectively. It is good practice to improvesuch steel by rolling it cool or even cold, and then drawing it in thisrange of temperature. For the high elastic limit and impact-resistancethus obtained, the accompanying softness and cheapness of machining 18 Proceedings of the International Association for Testing Materials, II, VI Congress,1912. The steels contained C, ; Si, ; Mn, ; P, ; S, ; Cu, ;As, ; N, SHOCK TESTS OF CAST STEEL. 511 are much greater than they
Transactions . ery small initial elongation and contraction of area, and per cent, respectively. It is good practice to improvesuch steel by rolling it cool or even cold, and then drawing it in thisrange of temperature. For the high elastic limit and impact-resistancethus obtained, the accompanying softness and cheapness of machining 18 Proceedings of the International Association for Testing Materials, II, VI Congress,1912. The steels contained C, ; Si, ; Mn, ; P, ; S, ; Cu, ;As, ; N, SHOCK TESTS OF CAST STEEL. 511 are much greater than they can be made by hardening and with Fig. 16. The passage through the transformation range was asorbitizing air cooling for ordinate A, but for the other ordinates itwas a furnace cooling, resulting in pearlitizing, and even in more orless advanced divorcing annealing, which was augmented by furtherexposure to divorcing annealing temperatures in the treatment of or- 55 u •c o1 Si <u 4 5 e* u a- o. Quenched in oil from. 900 800c 1 Reheated to * 800 600 Held for-hcmrs not held not held Not Quenched 900° 1100° 620° 720 a H 12 12 D E Fig. 17.—The Impact Test Shows the Influence of Heat TreatmentMore Clearly than the Tensile Test. Properties of Steel of per cent, of Carbon, Eoberts-Austen and Report Alloys Eesearch Committee, Institution of Mechanical Engineers,London, 1904. The steel contained: carbon , silicon , manganese , phos-phorus , sulphur , arsenic dinates Cto F inclusive. The influence of this slow transformationand of the resultant de-sorbitizing and divorce is shown incompara-bly more clearly by the impact-resistance than by any or all of thetensile properties. 512 SHOCK TESTS OF CAST STEEL. In Figs. 19 and 20 the strong maximum of impact-resistance whenthe tempering temperature reaches the 600°-700° range representsthe sorbitic state, and the sharp decrease at 740°, on rising past Acl,
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