Abstract
Studies of plates rolled from laboratory heats of 0·19C–1·20Mn Si-Al-killed steel showed that the transverse Charpy V notch shelf energy improved with decreasing sulphur content and with increasing amounts of hot rolling in the transverse direction. Hot-rolled plates with a low finishing temperature (control rolled) had slightly lower shelf energy than did regular hot-rolled plates, and additions of vanadium or niobium lowered the shelf energy of both hot-rolled and control-rolled plates. The length and width of the sulphides were proportional to the amount of reduction in the longitudinal and transverse directions, respectively. The shelf energy was inversely proportional to the length of the manganese sulphide inclusions in the direction of crack propagation. Directionality in shelf energy was minimized only by increasing the amount of cross rolling or by the use of very low sulphur contents.
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