Sadao Koshiba and Tsuneo Kuno
Lately, the demand for dies steel for die casting of aluminum, zinc and their alloys has considerably increased. In the present investigation the authors took up five samples of dies steels containing various quantities vanadium and tungsten, and a series of experiments has been carried out to study the transformation point of the samples and afterward the hardness, the rate of deformation, the tensile strength at elevated temperature, the hot hardness and the microstructure of the samples subjected to different heat treatment were measured. They ascertained from this investigation that the appropriate content of vanadium is about 0.65% at the range of 0.30∼1.10%V, and then adding of about 1.30%W increases the tensile strength at the high temperature of 500∼700°.
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