SU442882A1 - Method for continuous casting of slabs of large sections - Google Patents

Description

I The invention relates to ferrous metallurgy:, in particular, to the continuous casting of steel (UNRS),

There is a known method of continuous casting of large slab slabs using exothermic and heat insulating mixtures with a supply of metal into the mold below the level.

The disadvantage of this method is the formation of surface defects in the form of tears and cracks or coarse slag inclusions on narrow or wide faces of the slab,

In order to improve the quality of the slabs, a heat-insulating mixture is supplied to the metal mirror in the mold, in addition to the exothermic, the slag from the exothermic mixture is induced at the narrow faces of the ingot, and from the heat-insulating mixture on the rest of the metal mirror lupis. In this case, slags of different compositions are divided into refractory reheaters, and slags from the exotica mixture induce 10–20 squares of the metal mirror,

Active slags from the exothermic mixture assimilate nonmetallic inclusions coming from the circulation streams of meta; pga to areas of narrow faces, which ensures their high-quality surface. Slags from the heat-insulating mixture on the central part of the metal mirror provide the high-quality surface of wide edges.

 slab, on which, in the case of using only an exothermic mixture, coarse slag inclusions are formed as a result of uneven temperature distribution on the metal mirror in the crystallizer, uneven combustion of the mixture and entanglement of it in the metal,

The drawing shows the layout of the slag and the metal mirror

1 in the mold according to the proposed method, where I is an intermediate ladle with metal, 2 is a pouring glass, 3 is a mold, 4 is floating partitions, 5 is an exothermic mixture, 6 is a heat insulating mixture, 7 is the circulation flows of metal entering the crystallizer.

Metal casting on UNRS according to the proposed method is carried out in

next order. ,

Two floating partitions with their orientation relative to the end walls of the crystallizer at a distance of 2 are lowered onto the metal that has entered the crystallizer to a certain working level. After that, heat-insulating mixtures are induced in the areas between the partitions, and in the areas between the partitions and the end walls, exothermic mixtures are added, which are periodically sprinkled during the entire casting of the metal in the required quantities.

Part of the quality of things.

INVENTIONS

Claims (2)

1. A method of continuous casting of slabs of large sections, including the supply of liquid metal under its level in the crystallizer, with slag pointing from an exometric mixture characterized in that, in order to improve the quality of the slabs, a heat-insulating mixture is additionally supplied to the metal mirror in the crystallizer, moreover, the slag from the exothermic mixture is induced at the narrow faces of the ingot, and from the heat-insulating mixture - at the rest of the metal mirror, while the slags of pink compositions are separated by refractory partitions, 2. The method according to claim I, distinguishes the W-shu and the fact that slags from the exothermic mixture lead to 10-20 squares of the metal mirror.