JPS5662655A - Production of bottomed hollow steel ingot - Google Patents

Abstract

PURPOSE: To produce always a sound bottomed hollow steel ingot and reduce cost by making the relations between the wall thickness ratio between the bottom part of the steel ingot and of its side face part as well as between refractory material thickness ratio of the bottom part of a core and the side face part satisfy the specific formula.

CONSTITUTION: A bottomed core 6 consisting of an outside wall iron plate 8, a refractory material 12, an inside wall iron plate 10 and a vent pipe 14 for cooling installed in th central part on the inner side of this inside wall iron plate 10 is suspended in the mold 4 installed on a molding board 2 and molten metal 22 is poured by a bottom pouring method, whereby a bottomed hollow steel ingot 30 is produced. In this case, the relation shown by the formula (a)/(b)≤4-3A/B is required. Here, the part between the top face of the molding board 2 and the outside wall iron plate 8 of the bottom part of the core 6 is defined as steel ingot bottom part thickness Am, the part between the inside surface of a mold 4 and the outside wall iron plate 8 of the core side face part as steel ingot side face part thickness Bm, the thickness of the bottom part refractory material 12 of the core 6 as (am) and likewise the thickness of the side face part as(bm). The sound bottomed hollow steel ingot is manufactured by the core design based on the above.

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