Abstract
In order to investigate the relation between evolved gases and graphitization,further research on the relation between C and Si contents in cast iron and CO2 per cent, CO per cent in evolved gases, and addition of both graphitizers (Si, Al, Ni, Cu) and retarders (Mn, Cr, Zn, Sn) to molten iron respectively were performed. The proportional relation between graphitization degree ( % of G. C. / T. C.) and CO/CO+CO2, which has already been stated in the previous reports, was not always observed in this paper. Interesting results were obtained, however, on the volume of evolved gases, namely the volume of evolving gases by addition of graphitizer was larger than that by addition of retardar. With addition of graphitizers curves showing the relation between evolving gas volume and the quantity of alloying are always convex curve with maximum point at 2% addition, and with addition of retarders these curves are always inclined downwards. The outline of results obtained on the volume of evolving gases in our experiments is shown in followings.
