KR20140009584A - Pouring device for liquid state molten steel - Google Patents

Abstract

According to the invention, an injection device for liquid molten steel comprising an ingot mold (2), wherein the hot water portion (6) is arranged in the upper part of the ingot mold, and the ingot mold is the ingot mold base plate (3). Arranged on the steel flow channel 5 is arranged in the ingot mold base plate, the steel flow channel is in communication with the center injection tube 1 arranged on the side of the body of the ingot mold, the steel flow channel of the ingot mold In communication with the injection port 4 at the bottom; At least one injection port is arranged to be deflected away from the center position of the bottom of the ingot mold; The injection device for liquid molten steel slag during injection of molten steel by changing the position and number of injection ports of the ingot mold, by deflecting the injection port away from the center of the bottom of the ingot mold or by adding more injection ports. Improve capture; During or after the implantation procedure, such a device may alter the flow field distribution and temperature distribution of the liquid steel inside the ingot mold to reduce defects in central segregation and contraction of the ingot; At the same time, such an apparatus can change the position of the segregation on the ingot, thereby providing an injection device for the liquid molten steel that deflects the segregation away from the center and close to the rolling surface of the ingot.

Description

Injection device for liquid molten steel {POURING DEVICE FOR LIQUID STATE MOLTEN STEEL}

The present invention belongs to the technical field of metal fabrication equipment, and more particularly relates to liquid steel casting equipment.

With the development of the national economy, steel used in nuclear power generation, steel used in boilers and pressure vessels, steel used in flanges for wind power generation, steel used in bridges, and in skyscrapers and other structures Steel is subject to increasingly stringent quality requirements inside the steel plate. To ensure the internal quality of the steel plate, the steel plate is usually manufactured by techniques such as forging, electroslag remelting and directional solidification. However, because of their long manufacturing cycles and high manufacturing costs, manufacturers are further limited in reducing their manufacturing costs. However, in casting mold production using conventional ingots, the casting gate is located in the center of the ingot mold. According to the knowledge of the metal transfer principle, the steel flow in the direction perpendicular to the casting gate has a relatively higher temperature, which is likely to cause severe internal ingot segregation and center porosity. Severe segregation and voids in the central portion of the ingot are difficult to remove or reduce in subsequent steps. Therefore, rolled steel plates, especially steel plates with a thickness of ≧ 200 mm, often have internal micro-defects, which require unwanted inspections.

It is an object of the present invention to provide a liquid steel casting equipment which can improve the center segregation and voids of steel ingots. By the use of the novel equipment and casting method of the present invention, steel plates having a thickness above 200 mm and meeting the forging inspection criteria of JB / T5000.15-2007 Φ 2 rating can be manufactured on an industrial scale.

According to one embodiment of the present invention, there is provided a liquid steel casting equipment comprising an ingot mold, wherein an upper portion of the ingot mold is provided with a hot top; The ingot mold is arranged on the ingot mold base plate; A steel flow channel is formed in the ingot mold base plate, in communication with a central casting pipe arranged on one side of the ingot mold, and in communication with the casting gate at the bottom of the ingot mold; Liquid steel casting equipment is provided in which at least one casting gate is formed at a position away from the bottom center of the ingot mold.

The casting gate may be formed at a position in the corner of the ingot mold.

The casting gate may be formed at a position at the corner of the ingot mold.

The bottom of the ingot mold may deviate from the bottom center of the ingot mold, and one or more casting gates may be formed at a location proximate two adjacent sides of the ingot mold.

The bottom of the ingot mold may deviate from the bottom center of the ingot mold, and one or more casting gates may be formed at a location proximate two opposite sides of the ingot mold.

In the present invention, the molten steel flow field inside the ingot mold changes the position or number of the casting gates at the bottom of the ingot mold, thereby causing the casting gate to deviate from the bottom center of the ingot mold or of the casting gate. By increasing the number it can be improved during or after the casting of the molten steel. As such, slag entrapment by molten steel can be reduced during liquid steel casting. Moreover, after the liquid steel at high temperature enters the ingot mold gate continuously from the bottom gate, due to the impact of the raw steel flow path, the temperature distribution inside the ingot can be improved, so that the liquid steel casting and after completion of the casting During some time, when observed from the cross section of the mold, the temperature of the molten steel near the upper part of the gate is higher than the temperature in other parts of the molten steel. The gate at the corner or corner portion can be easily and quickly cooled due to the shorter distance from the ingot mold wall, thereby reducing the temperature of the molten steel above the upper portion of the gate, which in turn affects the solidification of the ingot Can have The movement of the position of the gate can change the position of the segregation to some extent, with the result that the segregation approaches the ingot surface and escapes from the center, which contributes to the improvement and separation of segregation during rolling under high pressure or during subsequent heat treatment. . The equipment of the present invention ensures the manufacture of very-heavy plates that meet the requirements of safety testing and performance. Moreover, such equipment can be manufactured in a simple manner and can be easily manipulated to meet the needs of industrial mass production.

Next, the present invention will be further described in connection with the accompanying drawings.
1 is a schematic diagram of a liquid steel casting equipment according to the present invention.
FIG. 2 is a diagram showing the positional distribution of the casting gate at the bottom of the ingot mold according to the first embodiment of the present invention. FIG.
3 is a diagram showing a positional distribution of a casting gate at the bottom of the ingot mold according to the second embodiment of the present invention.
4 is a diagram showing a positional distribution of a casting gate at the bottom of the ingot mold according to the third embodiment of the present invention.
Fig. 5 is a diagram showing the positional distribution of the casting gate at the bottom of the ingot mold according to the fourth embodiment of the present invention.

Example 1

As shown in Figs. 1 and 2, the liquid steel casting equipment includes an ingot mold 2, and an upper portion of the ingot mold 2 is provided with a pressure portion 6; The ingot mold 2 is arranged on the ingot mold base plate 3; A steel flow channel 5 is formed in the ingot mold base plate 3 and communicates with a center casting pipe 1 arranged on one side of the ingot mold 2, and at the bottom of the ingot mold 2 a casting gate ( In communication with 4); One casting gate 4 is formed at a position on the bottom of the ingot mold 2 which is separated from the bottom center of the ingot mold 2 and near the corner of the ingot mold 2. There are three ingot molds, each of which can perform casting of 33 tons of molten steel. Low alloy steel thick plate Q345B with a thickness of 280 mm that meets the forging test criterion Φ 2 can be manufactured by the use of such equipment and its proper operation. Here, 18 ingots were produced, the plate thickness was 200-300 mm, the pass rate of test Φ 2 was 95%, and the pass rate of test Φ 5 was 100%.

Example 2

As shown in Figs. 1 and 3, the liquid steel casting equipment includes an ingot mold 2, and an upper portion of the ingot mold 2 is provided with a pressure portion 6; The ingot mold 2 is arranged on the ingot mold base plate 3; A steel flow channel 5 is formed in the ingot mold base plate 3, in communication with the center casting pipe 1 arranged on one side of the ingot mold 2, and casting three at the bottom of the ingot mold 2. In communication with the gate 4; The casting gate 4 is separated from the bottom center of the ingot mold 2. The diameter of the center casting pipe is 80 mm and the diameter of the casting gate is 60 mm. There are two ingot molds, each of which can perform casting of 43 tons of molten steel. A low alloy steel thick plate Q345D with a thickness of 250 mm that meets the forging test criterion Φ 2 can be produced by the use of such equipment and its proper operation. Here, twelve ingots were produced, the plate thickness was 200-290 mm, the pass rate of test Φ 2 was 92%, and the pass rate of test Φ 5 was 100%.

Example 3

As shown in Figs. 1 and 4, the liquid steel casting equipment includes an ingot mold 2, and an upper portion of the ingot mold 2 is provided with a hot water portion 6; The ingot mold 2 is arranged on the ingot mold base plate 3; A steel flow channel 5 is formed in the ingot mold base plate 3 and communicates with a center casting pipe 1 arranged on one side of the ingot mold 2, and at the bottom of the ingot mold 2 a casting gate ( In communication with 4); One casting gate 4 is displaced from the bottom center of the ingot mold 2 and at a position on the bottom of the ingot mold 2 having a distance from the center by one quarter of the centerline of the bottom ingot mold in the width direction. Is formed. The diameter of the center casting pipe is 80 mm and the diameter of the casting gate is 60 mm. There are two ingot molds, each of which can perform casting of 48 tons of molten steel.

A low alloy steel thick plate Q345B with a thickness of 240 mm that meets the forging test criterion Φ 2 can be manufactured by the use of such equipment and its proper operation. Here, ten ingots were produced, the plate thickness was 200-270 mm, the pass rate of test Φ 2 was 90%, and the pass rate of test Φ 5 was 100%.

Example 4

As shown in Figs. 1 and 5, the liquid steel casting equipment includes an ingot mold 2, and an upper portion of the ingot mold 2 is provided with a hot water portion 6; The ingot mold 2 is arranged on the ingot mold base plate 3; A steel flow channel 5 is formed in the ingot mold base plate 3 and communicates with a center casting pipe 1 arranged on one side of the ingot mold 2, and at the bottom of the ingot mold 2 a casting gate ( In communication with 4); One or more casting gates 4 are formed at any position on the bottom of the ingot mold 2 which is separated from the bottom center of the ingot mold 2.

A low alloy steel thick plate Q345D with a thickness of 230 mm that meets the forging test criterion Φ 2 can be manufactured by the use of such equipment and its proper operation. Here, thirteen ingots were produced, the plate thickness was 200-270 mm, the pass rate of test Φ 2 was 85%, and the pass rate of test Φ 5 was 100%.

In the production of ingot molds using such equipment, the injection temperature of the ingot mold is 1530-1580 ° C., the diameter of the center casting pipe is 50-200 mm, the number of casting gates per ingot is 1-6, the diameter of the casting gate Is 30-200 mm. When a plurality of casting gates are used, the diameters of the casting gates may be the same or different from each other. The location of the casting gate may be applicable to any one or more of the plurality of locations simultaneously as shown in FIG. 5. The distance from the center of the casting gate to the edge of the ingot mold is 0-1000 mm.

The ingot mold can be a conventional ingot mold or a water-cooled ingot mold.

The molten steel to be cast may be any molten steel.

Those skilled in the art will appreciate that many modifications and variations are possible in view of the disclosed embodiments of their constructions, materials, and methods without departing from the spirit and scope of the invention. Accordingly, the claims appended hereto and the scope of their functional equivalents should not be limited by the specific embodiments described and illustrated herein as these are merely exemplary in nature.

Claims (5)

Liquid steel casting equipment comprising an ingot mold, the upper portion of the ingot mold being provided with a squeegee; The ingot mold is arranged on the ingot mold base plate; A steel flow channel is formed in the ingot mold base plate, in communication with a center casting pipe arranged on one side of the ingot mold, and in communication with the casting gate at the bottom of the ingot mold; Wherein the at least one casting gate is formed at a position away from the bottom center of the ingot mold. The liquid steel casting equipment as recited in claim 1, wherein the casting gate is formed at a position at a corner of the ingot mold. The liquid steel casting equipment as recited in claim 1, wherein the casting gate is formed at a position at an edge of the ingot mold. The liquid steel casting equipment of claim 1, wherein the bottom of the ingot mold is away from the bottom center of the ingot mold, and at least one casting gate is formed at a location proximate to two adjacent sides of the ingot mold. The liquid steel casting equipment of claim 1, wherein the bottom of the ingot mold is away from the bottom center of the ingot mold, and at least one casting gate is formed at a location proximate two opposite sides of the ingot mold.

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