SU1563840A1 - Intermediate ladle for continuous casting machine - Google Patents

Abstract

The invention relates to continuous casting of metals. The aim of the invention is to stabilize the start of the casting process and improve the quality of the metal by reducing the content of non-metallic inclusions. The intermediate bucket is made in the form of a lined container (FE) 1 with a bottom hole 2, in which a bucket cup (CS) 3 with a pouring channel 4 is installed, having an internal annular cavity 6 with a supply pipe (PP) 7. The CS is made protruding above the bottom lining a bucket of 0.07 ... 0.09 of its height, while in the protruding part of the glass an annular gas-permeable insert 5 is made, bordering its inner annular cavity 6. Before the beginning of the arrival of the liquid steel from the steel-teeming ladle in FE 1, through PP 7 serves inert gas under pressure m 0.15 ... 0.25 MPa. 1 hp f-ly, 1 ill.

Description

cut tank 1 is in an inert gas opening allowing 35

that position. When liquid metal enters the steel from the pouring ladle, it gradually fills the lined container 1, as a result of which impurities from the lining float to the metal surface and (if the level of the cup portion 3 protruding above the lining of the liner) comes through the pouring channel L of the ladle glass 3 and through the holes in the plates of the sliding gate 8 and the immersion cup 9 into the mold 10. The metal consumption is controlled during the casting process with the sliding gate 8. After the casting is completed, a series of heats and bottoms Formation of the lined container 1 closes the sliding gate 8 and stops the supply of inert gas through the inlet 7.

Making the bucket cup, protruding over the lining of the bottom of the bucket by 0.07-0.09 of its height, allows you to limit the first portions of cold metal and impurities from the lining of the bucket to the canal bucket, thereby eliminating the freezing of the pouring channel

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but it is effective to process the mass of liquid metal passing through the filling channel of the bucket cup and thereby reduce the formation of alumina deposits and the overgrowth of the flow section of the pouring channel of the bucket cup, the holes in the slide gate plates, the gate collector and the immersion cup. At the same time, a large number of inert gas bubbles are trapped by the jet of liquid metal, metal splashes on the walls of the crystallizer are eliminated, and the surface quality of continuously cast billets is not impaired. At the same time, a sufficient turbulent motion of the liquid metal is provided over the bucket cup, due to which most of the fine particles of alumina coagulate, which are lifted up into the slag layer due to the effect of lifting force.

Example. Casting of low-alloyed steel of responsible purpose was made on a two-strand continuous casting machine using the smelting method for smelting (on average there were 8 heats) from steel inert gas, allowing sufficient 5

about

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0

five

but it is effective to process the mass of liquid metal passing through the filling channel of the bucket cup and thereby reduce the formation of alumina deposits and the overgrowth of the flow section of the pouring channel of the bucket cup, the holes in the slide gate plates, the gate collector and the immersion cup. At the same time, a large number of inert gas bubbles are trapped by the jet of liquid metal, metal splashes on the walls of the crystallizer are eliminated, and the surface quality of continuously cast billets is not impaired. At the same time, a sufficient turbulent motion of the liquid metal is provided over the bucket cup, due to which most of the fine particles of alumina coagulate, which are lifted up into the slag layer due to the effect of lifting force.

Example. Casting low-alloyed steel for critical purposes was produced on a two-strand caster using the smelting and smelting method (on average, there were 8 heats) from steel workers 1

350 tons of bucket bucket through an intermediate bucket with a capacity of 17 tonnes and an undecidable bucket with a capacity of 25 tons. The total height of the lined part of the buckets was 1000 and 1300 mm respectively. The section of the casting billet is 250–1650 mm, the average casting speed is 0.7 m / min.

In the bottom hole of the tundish with a capacity of 17 tons, a bucket cup was installed, protruding above the lining of the bottom of the ladle to 0.08 of its height, i.e. 80 mm, in a bucket with a capacity of 25 tons, a bucket cup was installed, projecting at 0.09 of its height, i.e. on 117 mm. In the protruding portions of the ladle glasses, annular gas-permeable inserts were made, bordering on their inner annular cavities.

(Before the liquid metal from the steel-teeming ladle arrived at the intermediate through inlet side, inert gas was supplied under a pressure of 0.15-0.25 MPa. The gas pressure was maintained within these limits during the casting of the entire series of melts. It was not burned out during the entire series of melts. The casting process was stable, the level of the metal in the crystallizer did not fluctuate and it was not boiled. the end of the casting of a series of heats and the emptying of the tundish from molten steel; the supply of inert gas was stopped.

638406

Using the proposed bucket

(compared to the known) will simplify the casting process, i.e. reliably start the installation with the open slide gate, eliminate the tightening of the metering holes in the bucket glass, slide gate and the immersion cup, and thus

Q stabilize the casting process. The use of the proposed bucket reduces the content of oxides and oxysulfides by 1.5-1.8 times and increases the impact strength on transverse specimens with

) 5 negative test temperatures (versus known) on.

Claims (2)

Formula of inventions 20 1. Intermediate bucket of the machine for continuous casting of workpieces, containing a lined container with a bottom hole and a pouring glass installed in it, in gas-permeable 25 side walls of which are provided with an annular cavity for supplying an inert gas, characterized in that, in order to stabilize the beginning of the casting process and increase the metal quality by reducing the content of non-metallic inclusions, the upper end of the pouring nozzle is 0.07 more than above the bottom of the tundish. -0.09 bucket height. I 2. The bucket according to claim 1, characterized in that it is provided with an annular porous insert installed in the upper end of the pouring glass and adjacent to the annular cavity to supply an inert gas. 3i 40