SU933209A1 - Sleeve for continuous casting of metals and alloys - Google Patents

Description

(54) GLASS FOR CONTINUOUS CASTING OF METALS AND ALLOYS

one

The invention relates to metallurgy, in particular to the continuous development of metals and alloys.

A known glass for continuous disassembly of metals and alloys, made of refractory material in the form of a cylinder with a central channel for supplying metal with a vertical jet below the PZ level. quality ingot. This is explained by the fact that when casting metal through a known glass for a long time, the heat of superheat is not removed by the jet, which leads to a significant decrease in the rate of solidification, which reduces the rate of casting, and the development of liquidation processes that deteriorate

the quality of the internal structure of the ingot.

Also known is a glass for continuous casting of steel, made of refractory material in the form of a hohodonton cylinder with openings located in the lower part perpendicular or inclined to the vertical axis t23.

Claims (2)

When casting metal through a known glass, the heat of overheating is largely removed and segregation phenomena are not prevented. Due to these drawbacks, continuously cast ingots, especially from chromium-nickel-molybdenum steels, are largely affected by the so-called spider filament etching in the central zone, which limits the use of rolled products obtained from these ingots, for example, for tamping for a responsible purpose, since filamentous HT etching remains in the box office. It has been established by research that the arachnid thread-like etching in the center is the result of segregation processes occurring 1x, in the ingot during solidification. The goal of erosion correction is to improve the quality of the ingot being cast and to increase the casting speed by mixing the liquid core of the forming ingot. The goal is achieved by the fact that in a glass for continuous casting of metals and alloys, made of refractory material in the form of a hohodonny cylinder with outlet openings in the side walls, the lower end of the glass is made concave with a depth of 0.8-1.2 of the radius of the lower end of the glass. The drawing shows a glass, an extended section. The glass consists of a refractory to pus 1, in which the central channel 2 is made with openings 3 in the base walls for the supply of metal under the level. The lower end of the glass has a concavity of 4, (the letter D in the drawing indicates the diameter of the lower end of the glass, and the letter h indicates the depth of the concavity. The limits of the concavity are chosen according to the simulation results, which showed that with a depth of concavity less than 0.8 of the radius of the lower end of the glass the liquid brought into displacement decreases sharply and the mass transfer processes in the initial stage of the ingot formation do not change, therefore, the quality of the metal does not improve. With a concavity depth exceeding 1.2 half the diameter of the bottom end of the glass, Ro is a further increase in mixing, since the volume of liquid supplied to the I under the butt of the glass as it moves remains at the same level. An increase in the concavity depth of 1.2 times the diameter of the bottom of the glass leads to a decrease in the dimensions of the glass and its probability due to the proposed constructive implementation of the casting station and giving it a reciprocating motion in the process of pouring in the liquid core in the center of the ingot (due to the curvilinearity of the pushing surface with Akana) will occur by concentrating the pressure of this surface to the vertical nozzle axis. The pulsating nature of the resulting pressure will cause shock waves propagating from the end, nozzles deep into the ingot and an increase in mass transfer processes (mixing of the liquid core) in the initial stage of the ingot formation. This will lead to equalization of the temperature field and uniform distribution of impurities over the cross section of the cast ingot. In addition, the reciprocating movement of the pa3JUiBO4Horo glass will lead to erosion in the volume of the liquid phase of the side stream from the glass, creating a condition for a uniform solidification front, Tekhash co-economic efficiency of the proposed invention lies in the fact that reducing the superheat temperature of the initial stage of the ingot mold, uniform distribution of impurities and equalization of the temperature field over the section of the ingot lead to a practical increase in the appearance of thread-like etching at the center of the ingot, uvashcheniem skoros1i simultaneous injection by 10-35%. The invention The glass for continuous casting of metals and alloys, made of refractory material in the form of a hohodonny cylinder with outlet openings in the side walls, characterized in that, in order to improve the quality of the ingot and increase the speed, the bottom end is concave with a depth of 0, 8-1,2 radius of the bottom end of the glass. Sources of information taken into account during the examination 1. USSR author's certificate No. 614883, cl. B 22 D 11/10, 1975. 2. For Japan No. 52-41729, cl. In 22 D P / 10, 1977.