Abstract
In a former report, the effects of holding time at max. melting temperature were studied and these are mutually related with heating velocity and max. melting temperature at the same time. Accordingly, this time experiments to clear the effects of heating velocity on runnability was carried out with the change of max. melting temperature and holding time in this time. The results obtained were as follows: (1) It was cleared that the heating velocity of melting which was neglected hitherto had an important effect upon the runnability and in this experiment, more rapid heating produced a good runnability. (2) As it was mentioned in the former report, the effects of holding time were always influenced by the holding temperature and at lower holding temperature, some holding ti me is necessary to get the best runnability and in higher holding temperature, a short holding produces worse results. (3) The mutual relation between max. melting temperature, holding time and heating velocity was very close and in any cases, the superiority of max. melting temperature on influence for runnability was recognized. After all, it was cleared that a best mutual relation of them exists in any metal and the best runnability will be got under this relation.
