Abstract: This invention relates to a new method for the post melting treatment of molten steel in all, or nearly all, of the post melting systems in use at this time to lower the oxygen, hydrogen, and, to some extent, the nitrogen content thereof, and carry out the other purposes for which such systems are used including temperature and chemical homogenization continuous casting, piggy backing and other post melting treatment systems in use at this time in a manner which is less capital intensive, easier to operate and simpler in construction and operation than any of the basic systems, and apparatus therefor.

Abstract: This invention relates to a method and apparatus for treating molten metal to lower the oxygen, hydrogen, and, to some extent, the nitrogen content thereof in a manner which is less capital intensive, easier to operate and simpler in construction and operation than the vacuum arc degassing system.

Abstract: A method and apparatus for post-melting treatment of molten steel in which a container of molten steel is subjected to a sub-atmospheric pressure generated by air ejector means and, simultaneously, to an inert gas purge. A higher inert gas purge rate is used with an air ejector system than with a steam jet ejector system because the treatment pressure in the air ejector system is higher than the treatment pressure in the steam jet system. Heating means for at least partially compensating for heat loss is also disclosed.