Abstract
In former reports, the measurements of solidifying volume change and the synthetical judgement of custability were described as a study on castability. In the following reports, I will outline my study on runnability in its essential properties. The results obtained may be summarized as follows: (1) The effects of repeated melting were not conspicuous. (2) The effects of maximum melting temperature on runnability were remarkable and the results showed a curved line type. (3) The effects of super-heating produced results of a curved line, type too, and it was recognized that the coefficients of α, β in Bastien’s equation should have more important meaning than considered hitherto. (4) In these results, it was recognized that the variation of running velocity might be a leading factor of runnability and that it depends on the condition of molten states. (5) The effects of melting time produced variation of runnability, directly and especially, the heating time produced a remarkable variation.
