Abstract
As stated in the Ist Report (Tetsu-to-Hagané 1958 No. 1, p. 9-14), bars used for bar-test of measuring axial solidification rate of large steel ingots became thick due to the adhesionof solidified metal. Cutting the adhered metal layer-by-layer from their surface, it was found that certain layer of this metal, that was 1.5-2.5mm deeep after removing surface oxidized zone, nearly coincided with the melt of the depth at which the bar had been stopped for marking for a few seconds. By taking samples from this specific layer at every 400-600mm, the vertical segregation proceeding in the melt of the ingot core was qualitatively caught (Fig. 5, 6 & 7).
