各種中空鋼材の繰返衝撃強度の比較

概要

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The author investigated the repeated impact value of 0.25∿1.09% plain carbon, Ni-Cr, Cr-Mo, Ni-Cr-Mo, Mn-Cr-Mo. Mn-Cr-Mo-V, high C-Cr and high C-high Cr-Mo steels, by the Charpy impact and the Matsumura repeated impact testing machines. Because, although these steels have been utilized for hollow-shank-steel in America as well as in European countries, we have had no suitable shank steel in Japan until now. The results, are summarized as follows : (1) The results of the repeated impact test were shown in Figures 2, 5 and 6, which were plotted to logarithmic scales. There was a certain amount of scattering of results, but in each case a mean straight line could be drawn through the points to include the single blow test. (2) Accordingly, these lines were represented by the equation Y=dX+β. In this case it was intended to enlarge β. (3) 0.55%C steel was presumably the most excellent among all plain carbon steels, and Ni-Cr-Mo steel the most suitable for shank steel.