KR-20260067043-A - Ladle and molten steel supply control device therefor

KR20260067043AKR 20260067043 AKR20260067043 AKR 20260067043AKR-20260067043-A

Abstract

The present invention relates to a ladle and a molten steel supply control device for the same, and more specifically, to a ladle comprising: a main body configured to contain and transport molten steel; and a partition wall configured inside the main body to partition a molten steel supply space into which the molten steel is supplied and a raw material input space into which a raw material is introduced; wherein the partition wall comprises: a blocking part in which the raw material is stacked and which blocks the molten steel supply space and the raw material input space; and a molten steel supply control part formed to allow at least a portion of the molten steel introduced into the main body to pass from the molten steel supply space to the raw material input space; and a molten steel supply control device for the same.

Inventors

남기영

Assignees

현대제철 주식회사

Dates

Publication Date: 20260512
Application Date: 20241105

Claims (8)

A main body configured to contain and transport molten steel; and It includes a partition wall configured to partition the molten steel supply space, where the molten steel is supplied, and the auxiliary material input space, where the auxiliary material is introduced, which is configured to be installed inside the main body; The above bulkhead is, A blocking part that blocks the above molten steel supply space and the above auxiliary material input space; and Characterized by including a molten steel supply control unit formed such that at least a portion of the molten steel introduced into the main body passes from the molten steel supply space to the auxiliary raw material input space. Radle.
In Article 1, The above blocking unit is, It is formed at the highest height among the heights that withstand the pressure caused by the molten steel introduced into the above molten steel supply space, and The above molten steel supply control unit is, Characterized by being formed from the lowest height among the heights that cannot withstand the pressure from the molten steel introduced into the above molten steel supply space to the lowest height among the heights of the molten steel that guarantee the maximum reaction efficiency of the auxiliary raw materials. Radle.
In Article 1, The above auxiliary materials are, It includes a cooling agent that inhibits reaction with the molten steel, and The above molten steel supply control unit is, Characterized by being formed to control the amount of molten steel passing through in correspondence with the time during which the above-mentioned cold material is melted, Radle.
In Paragraph 3, The above molten steel supply control unit is, Characterized by having at least one through hole formed to connect the above-mentioned molten steel supply space and auxiliary material input space, and at least one through slit formed to extend upward and open. Radle.
In Paragraph 3, The above molten steel supply control unit is, Characterized by having at least one through hole formed to connect the above-mentioned molten steel supply space and auxiliary material input space formed in multiple layers, Radle.
A molten steel level measuring unit for measuring the height of molten steel supplied to a ladle according to any one of claims 1 to 5; and A molten steel supply control unit that controls the supply amount of molten steel by comparing the height of the bulkhead configured in the ladle with the measured height of the molten steel measured by the molten steel level measuring unit; Molten steel supply control device.
In Paragraph 6, The above ladles are, A first region corresponding to the blocking portion of the above bulkhead; A second region corresponding to the molten steel supply control section of the above bulkhead; and A third region corresponding to an area higher than the above bulkhead; including, The above molten steel supply control unit is, Characterized by controlling the supply amount of molten steel in correspondence with the area where the measured height of the molten steel measured by the above-mentioned molten steel level measuring unit is located. Molten steel supply control device.
In Article 7, The above molten steel supply control unit is, Characterized by controlling the supply speed when the above measurement height corresponds to the third region to be faster than the supply speed when it corresponds to the second region. Molten steel supply control device.

Description

Ladle and molten steel supply control device therefor The present invention relates to a ladle and a molten steel supply control device therefor, and more specifically, to a method for delaying and controlling the reaction time of auxiliary materials, such as magnesium, that are introduced in advance, when carrying out a sandwich-type spheroidization process while transporting molten steel using a ladle. Generally, in the casting process of high-carbon steel, materials with a high carbon content are used as the inner layer material of the casting rolls. As the high-carbon steel cools, the carbon reaches a supersaturated state, which can cause the carbon to precipitate in the form of graphite. This is primarily due to the slow cooling rate at high temperatures, during which graphite can form in various forms; in particular, the structural form can vary, such as flake graphite or spheroidal graphite, depending on casting conditions and alloy composition. Among these, spheroidal graphite produced through tissue control can improve the ductility and toughness of the material by reducing stress concentration compared to flake graphite, and can also improve fatigue strength and extend the product life. Furthermore, as the structure of graphite becomes spheroidized, the structural uniformity of the microstructure can be achieved. Since this contributes to consistency in mechanical properties, controlling the spheroidization of graphite is considered one of the important factors in the casting process of high-carbon steel. In order to achieve such spheroidization of graphite, the spheroidization of the graphite structure must be controlled during the casting process, and in particular, a magnesium treatment method is applied in the casting process to promote the spheroidization of graphite by adding magnesium to the molten steel. Among the spheroidizing processes by the magnesium treatment method, the sandwich spheroidizing process is a method in which a sandwich-type partition is installed inside a ladle that conveys molten steel, and auxiliary materials such as magnesium are pre-introduced into the partition inside the ladle before the molten steel is discharged from the electric furnace and induction furnace into the ladle, and then when the molten steel is discharged from the electric furnace and induction furnace and discharged into the ladle, the auxiliary materials such as magnesium react. However, when the added auxiliary raw material is tapped into a ladle, if it reacts prematurely with the molten steel, there are problems such as a decrease in the recovery rate of the magnesium auxiliary raw material and a decrease in the spheroidization rate of the product due to atmospheric oxidation of the magnesium auxiliary raw material. To resolve this issue and control the spheroidization of graphite, the reaction time of the auxiliary material introduced into the partition must be controlled. Until now, to slow down the reaction of the auxiliary material inside the partition, a certain amount of cooling agent has been added to the top of the auxiliary material to delay the reaction time. However, in order to minimize problems such as the drop in molten steel temperature that occurs during the melting process of the cold material added to slow down the reaction time of auxiliary materials, it is difficult to add more than a certain amount, and consequently, there are inevitably limitations on delaying the reaction time. Ultimately, simply using a cooling agent to slow down the reaction of auxiliary materials makes it difficult to resolve the problems of reduced recovery rate of magnesium auxiliary materials and reduced spheroidization rate of the product due to atmospheric oxidation of magnesium auxiliary materials caused by the early reaction of auxiliary materials, and this raises concerns about product defects such as reduced mechanical properties of the final product due to non-uniform graphite structure. As one of the related technologies, the following prior art document, Korean Registered Patent Publication No. 10-2605727, titled 'Hybrid Ladle and Automatic Molten Metal Injection System Using the Hybrid Ladle and Molten Metal Injection Method of the Automatic Molten Metal Injection System Using the Hybrid Ladle,' relates to a technology that utilizes a hybrid ladle having a volume in which the height is relatively longer than the width, thereby enabling molten metal transport and injection with a single ladle, and minimizing the defect rate caused by the lowering of the molten metal temperature by shortening the process delay time. In addition, the following prior art document, Korean Registered Patent Publication No. 10-1528772, 'Ladle Tilting Type Automatic Pouring Device,' relates to a technology for automating the supply of molten metal by tilting a ladle toward each mold in response to molds moving sequentially. However, while the prior art describes the introduction of a spheroidizing agent, it does no