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KR-20260063546-A - IMMERSION PIPE FOR VACUUM DEGASSING APPARATUS AND METHODS OF MANUFACTURING THE SAME

KR20260063546AKR 20260063546 AKR20260063546 AKR 20260063546AKR-20260063546-A

Abstract

The present embodiments relate to a immersion tube for a vacuum degassing facility and a method for manufacturing the same. An immersion tube for a vacuum degassing facility according to one embodiment may include: an inner shaped refractory disposed inside the steel shell of the immersion tube; a surface protection layer located on the surface of the inner shaped refractory; an outer shaped refractory disposed outside the steel shell; and an irregular refractory constructed to wrap between the inner shaped refractory and the steel shell, between the outer shaped refractory and the steel shell, and up to the lower portion of the inner shaped refractory and the outer shaped refractory.

Inventors

  • 이주훈

Assignees

  • (주)포스코퓨처엠

Dates

Publication Date
20260507
Application Date
20241030

Claims (11)

  1. Inner shaped refractory material placed on the inner side of the iron shell of the immersion tube; A surface protection layer located on the surface of the inner shaped refractory material; An outer shaped refractory material disposed on the outer side of the above iron shell; and An immersion tube for a vacuum degassing facility, comprising: an irregular refractory material constructed to wrap between the inner shaped refractory material and the steel shell, between the outer shaped refractory material and the steel shell, and up to the bottom of the inner shaped refractory material and the outer shaped refractory material.
  2. In paragraph 1, An immersion tube for a vacuum degassing facility, wherein the surface protection layer comprises at least one of a coating layer and a film layer.
  3. In paragraph 2, The above coating layer forming material is an immersion tube for a vacuum degassing facility satisfying Formula 1 below. [Equation 1] 3.9 ≤ C = Flow rate ( mm³ ) / Volatile weight loss (%) (In the above Equation 1, the flow rate is the value obtained by measuring the air permeability by passing air from the outside to the inside of the immersion tube after forming the coating layer, and Volatile weight loss is a value expressed as a percentage of the weight difference before and after heating the coating layer forming material at 1050℃, and The units of each variable were not considered and the values were calculated as dimensionless values.
  4. In paragraph 3, The above C is a immersion tube for a vacuum degassing facility, in the range of 3.9 to 7.0.
  5. In paragraph 2, An immersion tube for a vacuum degassing facility, wherein the above flow rate is in the range of 200 to 350 mm³ .
  6. In paragraph 2, Immersion tube for vacuum degassing equipment, wherein the above volatile weight loss is in the range of 30% to 98%.
  7. In paragraph 1, The above-mentioned immersion tube for a vacuum degassing facility is a immersion tube for a vacuum degassing facility having a crack occurrence rate of 1% or less of the total area under heating conditions in the range of 100℃ to 400℃.
  8. Step of constructing an inner shaped refractory material in the shape of a cylindrical column; A step of forming a surface protection layer on the outer surface of the inner shaped refractory material; A step of installing a steel shell on the outer side of the internally shaped refractory material having the above-mentioned surface protection layer formed; A step of installing an irregular refractory material to wrap between the inner shaped refractory material and the steel shell, and up to the bottom of the inner shaped refractory material; A step of constructing an outer shaped refractory material on the outer side of the above iron shell; and A step of installing an irregular refractory material to wrap between the outer shaped refractory material and the steel shell, and up to the bottom of the outer shaped refractory material; A method for manufacturing an immersion tube for a vacuum degassing facility, comprising
  9. In paragraph 8, The step of forming the above surface protection layer can be formed in the form of a coating layer, and The above-mentioned coating layer forming material is a method for manufacturing an immersion tube for a vacuum degassing facility, satisfying Formula 1 below. [Equation 1] 3.9 ≤ C = Flow rate ( mm³ ) / Volatile weight loss (%) (In the above Equation 1, the flow rate is the value obtained by measuring the air permeability by passing air from the outside to the inside of the immersion tube after forming the coating layer, and Volatile weight loss is a value expressed as a percentage of the weight difference before and after heating the coating layer forming material at 1050℃, and The units of each variable were not considered and the values were calculated as dimensionless values.
  10. In paragraph 8, A method for manufacturing a immersion tube for a vacuum degassing facility, comprising a drying step after the step of installing an irregular refractory material to wrap between the outer shaped refractory material and the steel shell, and up to the bottom of the outer shaped refractory material.
  11. In Paragraph 10, A method for manufacturing an immersion tube for a vacuum degassing facility, wherein the above drying is performed at 100 to 400°C for 24 hours.

Description

Immersion pipe for vacuum degassing apparatus and methods of manufacturing the same The present embodiments relate to an immersion tube for a vacuum degassing facility and a method for manufacturing the same. Generally, the vacuum degassing process promotes the degassing of molten steel and the flotation of precipitates in the ladle, and homogenizes the steel composition and temperature through an external refining facility that injects inert gas through the inlet of the immersion tube to recirculate the molten steel and blows in oxygen through a lance. In the immersion tubes used in the RH (Rheinstahl Heraus) system, which is one of these degassing devices, shaped and unshaped refractories are used on the inner and/or outer sides centered around the steel shell. Since the unshaped refractories used in the immersion tubes generally contain a large amount of moisture, a drying process is required after the construction of the shaped and unshaped refractories. However, if the temperature rises rapidly or heat is not transferred uniformly during the drying process of the irregular refractory material in the immersion tube, the moisture inside the irregular refractory material evaporates quickly, causing the internal pressure to rise. This can lead to cracks and fissures in the regular or irregular refractory material, or cause spalling, resulting in a problem of reduced durability and operational efficiency of the immersion tube. Therefore, there is a need for the development of technology to prevent spalling and cracking during the construction of immersion pipes. FIG. 1 schematically shows an immersion tube for a vacuum degassing facility according to one embodiment. FIG. 2 is an image showing an immersion tube for a vacuum degassing facility having a coating layer formed according to one embodiment. FIG. 3 is an image showing an immersion tube for a vacuum degassing facility having a film layer formed according to another embodiment. Figure 4 is a graph showing the C value calculated using the volatile weight loss and flow rate. Figure 5 is an image for checking whether cracks occur in the shaped refractory material located on the inside of the immersion tube in which the coating layer is formed according to Example 1. Figure 6 is an image for checking whether cracks occur in the shaped refractory material located on the inside of the immersion tube in which a coating layer is formed according to Comparative Example 1. Figure 7 is an image for checking whether cracks occur in the shaped refractory material located on the inside of the immersion tube in which a coating layer is formed according to Comparative Example 2. Figure 8 is an image for checking whether cracks occur in the shaped refractory material located on the inside of the immersion tube in which a coating layer is formed according to Comparative Example 3. Terms such as first, second, and third are used to describe various parts, components, regions, layers, and/or sections, but are not limited thereto. These terms are used solely to distinguish one part, component, region, layer, or section from another part, component, region, layer, or section. Accordingly, the first part, component, region, layer, or section described below may be referred to as the second part, component, region, layer, or section without departing from the scope of the present invention. The technical terms used herein are for the reference of specific embodiments only and are not intended to limit the invention. The singular forms used herein include plural forms unless phrases clearly indicate otherwise. As used in the specification, the meaning of "comprising" specifies certain characteristics, areas, integers, steps, actions, elements, and/or components, and does not exclude the presence or addition of other characteristics, areas, integers, steps, actions, elements, and/or components. When it is stated that one part is "above" or "on" another part, it may be directly above or on the other part, or other parts may be involved in between. In contrast, when it is stated that one part is "directly above" another part, no other parts are interposed in between. Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as generally understood by those skilled in the art to which this invention pertains. Terms defined in commonly used dictionaries are further interpreted to have meanings consistent with relevant technical literature and the present disclosure, and are not interpreted in an ideal or highly formal sense unless otherwise defined. Also, unless otherwise specified, % means weight %, and 1 ppm is 0.0001 weight %. In this specification, the term “combination(s) of these” described in the Markush-type expression means one or more mixtures or combinations selected from the group consisting of the components described in the Markush-type expression, and means including any one or more selected from the group consi