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THE INFLUENCE OF CHROMIUM UPON THE OXIDIZING PROPERTY OF TUNGSTEN AT HIGH TEMPERATURES. Siro Isida, Hirosi Asada and Saburo Higasimura. SYNOPSIS:As is well known, tungsten has the highest melting point among the metals known at present and is one of the metals having the highest tensile strength at high temperatures. It is, however, one of the most oxidizing metals at high temperatures, in the presence of air. The authors attempt here to investigate the influence of chromium added to tungsten upon the improvement of the properties of this material and the removal of the defect. The preparation of the W-Cr alloys was the most difficult task. Many attempts for the preparation of samples by sintering powdered tungsten and chromium had failed, but finally it was succeeded with the thermit process. In Table 2, the compositions of the samples by chemical analysis are given. It will be seen that a certain amount of aluminium, say 5 percent, is always present as a result of the preparation by the thermit process. In this paper, the W-Cr equilibrium diagram is first dealt with. In Sargent's paper, the existence of W7Cr3, WCr3 and WCr7 is proposed, but it appears to the authors that there is no other literature regarding the W-Cr equilibrium diagram. In the present research on the diagram, the melting temperatures, microscopic structures, X ray analyses and hardness were investigded in order.