METHOD OF STEEL VACUUM REFINING PROCESS IN LADLE, MECHANISM (VARIANTS) AND JUNCTION PIPE FOR ITS IMPLEMENTATION Russian patent published in 2008 - IPC C21C7/10 

FIELD: siderurgy.

SUBSTANCE: invention relates to an area of metallurgy; in particular, to the method and equipment necessary for the out-of-furnace processing of liquefied metals. The application includes introduction of the mixed gas during all refining process into a ladle filled with the liquefied steel which, in turn, is placed inside a vacuum chamber. At the second refining stage the rarefaction is increased with similar intensity to provide the same rarefaction at any given time moment all over the steel surface in the ladle. At the second stage also, during the beginning of an intensive burning of steel, its boiling surface becomes divided into the central and peripheral areas. The larger rarefaction degree is induced over the central area, as opposed to that over the peripheral one. Thereafter the rarefaction degree goes on to increase over the indicated areas, thus securing the given differences between them. At the third state the aforementioned areas are united, while the rarefaction degree over an entire steel surface continues to increase until it reaches the target level. The method can be fulfilled by means of installation for the vacuum refining of steel in the ladle and the junction pipe produced in such a manner that it may be drowned deep down the liquefied steel. Use of this invention permits to reduce the length of the vacuum refining process.

EFFECT: reduction in length of the steel vacuum refining process.

45 cl, 25 dwg, 1 tbl, 1 ex