Abstract
The process of refining by consumable electrode arc melting method is discussed based on the results described in the first report (idem, Tetsu-to-Hagané, 48 (1962) 13, p. 1654) and more experiments were successively performed.
1) Reduction of various oxides such as Al203, Si02 and Cr203 reacting with carbon in molten metal might be possible in the range of temperature and pressure in which the melting was carried out. And a possibility of removal of Al203 and Si02 generating their gaseous suboxides was discussed. Generation of the former suboxide would be impossible by thermal decomposition, but possible by carbon reduction at high temperature. The 510 could be generated by thermal decomposition as well as by carbon reduction.
2) Floating refining process which was peculiar to the method was discussed; and the analyses of oxide inclusions floated up on the surface of an ingot confirmed that the process really took place.
3) Decrease of nitrogen and hydrogen was discussed.
