WO2021177101A1 - Integrated tuyere for converter - Google Patents

Integrated tuyere for converter Download PDF

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Publication number
WO2021177101A1
WO2021177101A1 PCT/JP2021/006825 JP2021006825W WO2021177101A1 WO 2021177101 A1 WO2021177101 A1 WO 2021177101A1 JP 2021006825 W JP2021006825 W JP 2021006825W WO 2021177101 A1 WO2021177101 A1 WO 2021177101A1
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WO
WIPO (PCT)
Prior art keywords
tuyere
refractory
tube
pipe
double metal
Prior art date
Application number
PCT/JP2021/006825
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French (fr)
Japanese (ja)
Inventor
竹内　和彦
泰治 枝本
Original Assignee
黒崎播磨株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 黒崎播磨株式会社 filed Critical 黒崎播磨株式会社
Priority to EP21765036.5A priority Critical patent/EP4071254A4/en
Priority to BR112022011368A priority patent/BR112022011368A2/en
Priority to CN202180005785.XA priority patent/CN114502749A/en
Publication of WO2021177101A1 publication Critical patent/WO2021177101A1/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/48—Bottoms or tuyéres of converters
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases

Definitions

  • the present invention is a tuyere provided at the bottom of a converter in order to blow gas into a converter for steelmaking, and a double metal pipe filled with a refractory in the inner pipe and a tuyere refractory are integrated. Regarding the integrated tuyere for converters.
  • a tuyere is provided on the bottom of the converter as a refractory for blowing gas.
  • tuyere there are several types of tuyere depending on the purpose of use.
  • the main purpose is to agitate molten steel in a converter
  • the "double metal pipe in which the inner pipe is filled with a fireproof material” means that the metal pipe (inner pipe) inside the double metal pipe is filled with a fireproof material, and the inner pipe and the outer metal pipe (outer pipe) are filled.
  • the gap (slit) is the gas passage.
  • this "double metal pipe in which the inner pipe is filled with a refractory material” is also simply referred to as a "double metal pipe”.
  • Patent Document 1 and Patent Document 2 disclose tuyere in which a double metal pipe is used, and these tuyere penetrate the tuyere refractory constructed in the converter at the time of on-site construction.
  • This double metal tube must be inserted into the hole, and then the double metal tube must be fixed to the iron skin, which causes a problem that the mounting work requires a great deal of time and effort.
  • the central part (inside the inner pipe) of the double metal pipe is filled with a refractory material and gas does not flow in the inner pipe, the temperature becomes high during use and it is easy to melt. Therefore, the thickness of the metal tube is as thin as about 1 mm so that the influence is small even if it melts.
  • the metal tube on the working surface side melts during use and the width of the slit is widened, so that the working surface is quickly worn.
  • the thickness of the metal tube is as thin as about 1 mm, so that the metal tube is easily deformed by the pressure during molding, and the inner tube and the outer tube are easily deformed. It is difficult to uniformly secure a gap (slit) with and about 1 mm, and in some cases, the slit may be crushed.
  • the annular tuyere has a shaft core portion composed of an inner pipe and a fireproof material filling layer on the inner surface side of the inner pipe, and a ring-shaped gap on the outside of the shaft center portion. It is composed of a tubular part to be fixed, and a tuyere fireproof material is constructed around the annular tuyere in close contact with the tubular part. Further, it is described that the tuyere refractory is separated from the lining refractory, and the tuyere refractory and the annular tuyere are integrally formed.
  • the tuyere refractory and the annular tuyere are integrally formed, but since the annular tuyere protrudes from the tuyere refractory, the annular tuyere is inserted into the converter. If the protruding annular tuyere is gripped and lifted or hit against an object during construction or handling, the annular tuyere may be deformed and the ring-shaped spacing (slit) may be crushed. If the slit is crushed, the required gas flow rate cannot be secured, which hinders the operation of the converter.
  • the problem to be solved by the present invention is that in an integrated tuyere for a converter in which one double metal pipe and a tuyere refractory are integrated, the double metal pipe during construction and handling in the converter It is an object of the present invention to provide an integrated tuyere for a converter that suppresses a decrease in gas flow rate due to deformation or damage and has a simple structure.
  • the following integrated tuyere for converter is provided.
  • 1. A single double metal tube that has an inner tube and an outer tube arranged concentrically and the inner tube is filled with refractory.
  • the metal case has a thickness of 6 mm or more and 20 mm or less, and a length of 3% or more and 50% or less of the total length of the tuyere refractory.
  • the outer tube of the double metal tube has an upper outer tube and a lower outer tube, and the lower outer tube has a thickness of 3 mm or more and is thicker than the upper outer tube.
  • An integrated tuyere for converters that is welded and fixed to the bottom plate. 2. The integrated tuyere for converter according to 1 above, wherein the upper outer pipe and the lower outer pipe are integrated. 3. 3.
  • the boundary between the upper outer pipe and the lower outer pipe is located at the same height as the upper surface of the bottom plate of the metal case, or at a height of up to 40% of the total length of the tuyere refractory upward from the upper surface of the bottom plate of the metal case. ,
  • the integrated tuyere for converter according to the above 2.
  • the thickness and length of the metal case covering the lower end surface and the lower side surface of the tuyere refractory are limited to a predetermined range, and the outer tube of the double metal tube is upper. It is composed of an outer pipe and a lower outer pipe that is thicker than this upper outer pipe, and by welding and fixing this lower outer pipe to the bottom plate of the metal case, a double metal pipe can be used during construction and handling inside the converter. It can prevent deformation and damage. As a result, it is possible to suppress a decrease in the gas flow rate due to deformation or damage of the double metal tube, and it is possible to discharge the gas at a stable flow rate. Moreover, it has a simple structure and is easy to install in a converter, improving work efficiency.
  • FIG. 1 is an enlarged cross-sectional view taken along the line AA of FIG.
  • 1 Enlarged vertical cross-sectional view of the gas supply unit in the integrated tuyere for converter of FIG.
  • FIG. 1 schematically shows the overall configuration of an integrated tuyere 1 for a converter according to an embodiment of the present invention in a vertical cross section.
  • 2 is an enlarged cross-sectional view taken along the line AA of FIG. 1
  • FIG. 3 is an enlarged vertical cross-sectional view of the metal case 4 portion of the integrated tuyere 1 for converter.
  • the integrated tuyere 1 for a converter has a tuyere refractory 2 having a rectangular plan view and a square cone except for the metal case 4, and a tuyere refractory 2. It includes a metal case 4 provided at the bottom, and a double metal tube 3 that penetrates the through hole 21 of the tuyere refractory 2 and the metal case 4 and is welded and fixed to the metal case 4.
  • the double metal tube 3 is fixed to the through hole 21 of the tuyere refractory 2 via an adhesive 22 having a thickness of about 1 mm.
  • the total length of the double metal tube 3 is 1500 mm.
  • the lower portion of the tuyere refractory 2 is a square pillar having a small side length due to a step for fitting with the metal case 4.
  • the metal case 4 has a bottom plate 41 that covers the lower end surface of the tuyere refractory 2, and a side plate 43 that covers the lower side surface of the tuyere refractory 2.
  • the side plate 43 is formed in a square tubular shape, and the square tubular side plate 43 is welded and fixed to the upper surface 44 of the rectangular bottom plate 41.
  • the metal case 4 and the lower part of the tuyere refractory 2 are joined via an adhesive.
  • there is a through hole 42 in the central portion of the bottom plate 41 of the metal case 4 a double metal pipe 3 penetrates through the through hole 42, and the double metal pipe 3 is welded and fixed to the bottom plate 41. ing.
  • the thickness T of the bottom plate 41 and the side plate 43 constituting the metal case 4 is 12 mm
  • the length L of the metal case 4 is 50 mm (5% with respect to the total length of the tuyere refractory 2).
  • the double metal pipe 3 and the metal case 4 are all made of metal, and are typically SS material (rolled steel material for general structure), SC material (carbon steel material for machine structure), and STKM material (for machine structure). It is made of steel such as carbon steel pipe) or stainless steel.
  • the tuyere refractory 2 has a total length of 1000 mm, an upper end surface is a rectangle with a short side of 100 mm and a long side of 150 mm, and the horizontal cross section of the surface of the metal case 4 in contact with the upper end surface of the side plate 43 is 110 mm for the short side and 160 mm for the long side.
  • the rectangular shape of the hole 21 has an inner diameter of 27 mm and a weight of 50 kg.
  • the horizontal cross section of the tuyere refractory 2 is rectangular in the present embodiment, the tuyere refractory has a trapezoidal, square, circular, fan-shaped or other cross section depending on the arrangement of the furnace bottom bricks arranged around the tuyere refractory. Can also be used. Further, the total length of the tuyere refractory 2 may be determined according to the length of the surrounding furnace bottom brick.
  • the double metal pipe 3 is arranged concentrically in the through hole 21 of the tuyere refractory 2 so that the central axes of the inner inner pipe 31 and the outer outer pipe 32 coincide with each other.
  • the slit 33 is evenly formed between the inner pipe 31 and the outer pipe 32.
  • the thickness of the slit 33 is 1 mm
  • the thickness of the inner tube 31 is 1.5 mm.
  • protrusions 34 are provided on the outer periphery of the inner pipe 31 at equal intervals in the circumferential direction.
  • the protrusion 34 on the outer circumference of the inner pipe 31 is formed by welding a metal wire in the longitudinal direction (vertical direction) of the outer circumference of the inner pipe 31, or cutting the outer circumference into a groove shape using a thick inner pipe as a material.
  • the inside of the inner pipe 31 is filled with a refractory material 35. Further, the adhesive material 22 is filled between the outer pipe 32 and the tuyere refractory material 2 (through hole 21).
  • the outer pipe 32 of the double metal pipe 3 is composed of an upper outer pipe 321 and a lower outer pipe 322, and the lower end of the upper outer pipe 321 and the upper end of the lower outer pipe 322 are joined and integrated by welding. It has become.
  • the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 is located at the same height as the upper surface 44 of the bottom plate 41 of the metal case 4.
  • the thickness of the upper outer tube 321 is 1 mm
  • the thickness of the lower outer tube 322 is 5.5 mm.
  • the gap between the inner pipe 31 and the upper outer pipe 321 and the gap between the inner pipe 31 and the lower outer pipe 322, that is, the thickness of the slit 33 is the same.
  • FIG. 4 is an enlarged vertical cross-sectional view of the gas supply unit 5 that supplies gas to the double metal pipe 3 in the integrated tuyere 1 for converter in FIG.
  • the gas supply unit 5 has an inner diameter slightly larger than the outer diameter of the double metal pipe 3 (lower outer pipe 321), and the socket connecting portion 52 with the gas pipe (not shown).
  • a connecting pipe 51 is provided in the middle of the double metal pipe 3.
  • the gap between the connecting pipe 51 and the lower outer pipe 321 is sealed by welding.
  • the gas supplied to the socket connecting portion 52 passes through the connecting pipe 51 from the gas introduction port 323 provided between the lower outer pipe 322 and the connecting pipe 51 to the gap between the inner pipe 31 and the lower outer pipe 322, that is, the slit 33. Introduced in.
  • the tuyere refractory material 2 can be obtained by adding a binder such as a phenol resin to a refractory raw material mixture containing magnesia and scaly graphite as main raw materials, kneading the refractory material 2, and then pressure-molding and heat-treating the material.
  • the through hole 21 can be provided by pulling out the mandrel embedded at the time of molding after molding or boring after heat treatment.
  • the double metal tube 3 can be mounted and fixed in the through hole 21 by applying an adhesive 22 to the outer surface thereof and inserting the double metal tube 3 into the through hole 21.
  • the metal case 4 can be joined to the lower part of the tuyere refractory 2 via an adhesive. After that, the lower outer pipe 322 of the double metal pipe 3 is welded and fixed to the bottom plate 41 of the metal case 4, so that the integrated tuyere 1 for converter can be manufactured.
  • the adhesive used between the double metal tube 3 and the tuyere refractory material 2 and between the metal case 4 and the tuyere refractory material 2 only an organic adhesive material or an inorganic adhesive material, or Those to which a refractory powder is added can be used.
  • Specific examples include one or more types of adhesives such as acrylic resin-based, urethane resin-based, epoxy resin-based, phenol resin-based, sodium silicate-based, cement-based, and silica sol-based adhesives, or metal oxide powders and the like. It is the one to which fire-resistant powder such as metal powder is added.
  • a phenol resin containing magnesia powder is used between the double metal tube 3 and the tuyere refractory 2, and an epoxy resin adhesive is used between the metal case 4 and the tuyere refractory 2. It was used.
  • the adhesive between the double metal tube 3 and the tuyere refractory 2 can be made of an adhesive containing a refractory powder to further suppress wear on the working surface.
  • the double metal tube 3 is attached and fixed to the through hole 21 of the tuyere refractory after pressure molding via an adhesive material. Therefore, even if the double metal tube 3 having a thin thickness is used, the double metal tube 3 is not deformed or the slit is not crushed during the production of the integrated tuyere 1 for converter.
  • the thickness T of the metal case 4 is such that the tuyere refractory 2 can be held so that the tuyere refractory 2 does not shift when the converter integrated tuyere 1 is lifted or held horizontally.
  • a thickness is required, and specifically, it can be 6 mm or more and 20 mm or less. If the thickness T of the metal case 4 is less than 6 mm, the tuyere refractory may shift and the double metal tube 3 may be deformed, and if it exceeds 20 mm, it becomes heavy and difficult to handle.
  • the length L of the metal case 4 can be an appropriate length according to the length of the tuyere refractory, specifically, 3% or more, preferably 5% or more of the total length of the tuyere refractory 2. Can be. If the length L of the metal case 4 is less than 3% of the total length of the tuyere refractory 2, the tuyere refractory 2 is displaced and the double metal tube 3 is deformed, or the tuyere refractory 2 is likely to fall.
  • the upper limit of the length L of the metal case 2 does not have to be particularly limited, but if it is too long, the tuyere fire resistance will be deteriorated in consideration of the fact that the integrated tuyere 1 for converter becomes too heavy and the handleability deteriorates. It can be 50% or less of the total length of the object 2, and further, 30% or less of the total length of the tuyere refractory object 2 is sufficient.
  • the double metal pipe 322 of the double metal pipe 3 is thicker than the upper outer pipe 321, the double metal pipe 3 is gripped and the integrated tuyere 1 for converter is lifted in a horizontal state.
  • the thickness of the lower outer pipe 322 depends on the size of the tuyere refractory material 2 to be used, even if the double metal pipe 3 of the integrated tuyere 1 for converter is gripped and maintained in a horizontal state.
  • the thickness may be set so as not to be deformed, and specifically, it can be 3 mm or more.
  • the thickness of the lower outer pipe 322 is less than 3 mm, it may be deformed when a force is applied to the double metal pipe 3 of the integrated tuyere 1 for converter.
  • the upper limit of the thickness of the lower outer pipe is not particularly set, but if the thickness is too thick, the converter integrated tuyere becomes heavy, and if there is a problem in handling, it can be set to 10 mm or less.
  • the double metal pipe 3 is combined with the tuyere refractory material 2 and the metal case 4. It can be easily attached to and the work efficiency at the time of manufacturing is improved. Moreover, since the thickness of the lower outer pipe 322 is increased by increasing the outer diameter of the lower outer pipe 322 without changing the thickness of the gap (slit 33) between the lower outer pipe 322 and the inner pipe 31, the outer diameter of the lower outer pipe 322 is increased. Is smaller than the case where it is separated without being integrated with the upper outer pipe 321 (FIG. 6 described later).
  • the gas supply unit 5 provided in the lower part of the lower outer pipe 322 can also be made smaller. Therefore, it is excellent in handling at the time of furnace construction. In addition, the overall weight can be reduced.
  • the thickness of the upper outer pipe 321 of the double metal pipe 3 does not need to be thickened and can be made sufficiently thin. Therefore, when the metal pipes (inner pipe 31 and upper outer pipe 321) are melted during use and the width of the slit 33 is widened. However, it is possible to prevent the working surface from being worn out too quickly. Further, since the thickness of the metal pipe (inner pipe 31 and upper outer pipe 321) can be sufficiently reduced, the width of the slit 33 can be kept small, and the intrusion of molten steel into the slit 33 can be suppressed. .. Specifically, the thickness of the inner pipe 31 and the upper outer pipe 321 can be 0.5 mm or more and 3 mm or less. If the thickness of the inner pipe 31 and the upper outer pipe 321 is less than 0.5 mm, workability deteriorates due to deformation during handling during manufacturing, and if it exceeds 3 mm, it tends to melt during use.
  • the height position of the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 is set to the same height position as the upper surface 44 of the bottom plate 41 of the metal case 4 as in the present embodiment, or the bottom plate 41 of the metal case 4 is set. It is preferable that the height is up to 40% of the total length of the tuyere refractory 2 upward from the upper surface 44 of the metal case 4, and more preferably the total length of the tuyere refractory 2 is upward from the upper surface 44 of the bottom plate 41 of the metal case 4.
  • the height position can be up to 10%.
  • the height position of the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 is the same height position as the upper surface 44 of the bottom plate 41 of the metal case 4, or above the upper surface 44 of the bottom plate 41 of the metal case 4. Therefore, it is possible to further prevent the double metal tube 3 from bending when the double metal tube 3 is held and handled.
  • the upper limit of the height position of the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 does not have to be particularly limited, but the total length of the tuyere refractory 2 is upward from the upper surface 44 of the bottom plate 41 of the metal case 4.
  • the tuyere refractory 2 may wear out during use and come into contact with molten steel. It is preferably in the vertical position, and more preferably in the height position up to 10% of the total length of the tuyere refractory. If the height position of the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 is lower than the lower surface 45 of the bottom plate 41 of the metal case 4, the double metal pipe 3 is held and handled. The heavy metal tube 3 is more likely to bend.
  • the height position of the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 is the lower surface of the bottom plate 41 of the metal case 4.
  • the outer diameter of the double metal tube 3 and the thickness of the slit 33 are appropriately determined depending on the flow rate of the gas to be blown and the number of tuyere installed in the converter.
  • the outer diameter of the double metal tube 3 can be 20 mm or more and 60 mm or less, and the thickness of the slit 33 can be 0.5 mm or more and 3 mm or less from the viewpoint of easily securing the flow rate of the double metal tube 3.
  • the length of the portion of the double metal pipe 3 protruding from the metal case 4 is determined by the thickness of the iron skin of the converter, the position of the gas pipe, etc., but if it is too long, it is easily deformed, so the maximum length is about 1000 mm. It is preferable, and it can be at least about 200 mm.
  • FIG. 5 is an enlarged vertical sectional view of a metal case portion of an integrated tuyere for a converter according to another embodiment of the present invention.
  • the height position of the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 is 20 mm above the upper surface 44 of the bottom plate 41 of the metal case 4 (the total length of the tuyere refractory 2). 2%).
  • the through hole 21 of the tuyere refractory 2 has a stepped shape in which the lower side expands.
  • the upper outer pipe 321 and the lower outer pipe 322 are joined and integrated by welding.
  • FIG. 6 is an enlarged vertical sectional view of a metal case portion of an integrated tuyere for a converter, which is still another embodiment of the present invention.
  • the upper outer pipe 321 and the lower outer pipe 322 of the outer pipe 32 of the double metal pipe 3 are separated without being integrated. That is, the upper end surface of the lower outer pipe 322 is welded and fixed to the lower surface 45 of the bottom plate 41 of the metal case 4, the upper outer pipe 321 penetrates into the through hole 42 of the bottom plate 41, and the upper part of the penetration portion is welded and fixed to the bottom plate 41. Has been done.
  • the condition that the thickness T of the metal case 4, the length L of the metal case 4, and the thickness of the lower outer tube 322 of the double metal tube 3 are different is satisfied.
  • Table 1 shows the results of handling tests of the integrated tuyere for converters.
  • the material of the metal case 4 is SS400
  • the material of the double metal tube 3 is SUS304 for the inner tube 31 and the upper outer tube 321 and STKM for the lower outer tube 322.
  • the double metal pipe 3 protruding from the bottom plate 41 of the metal case 4 of the integrated tuyere for the converter was placed at the position of 1/3 of the total length of the protruding part from the bottom plate 41 of the metal case 4 and the rear end.
  • the two points were held horizontally by a crane, maintained in a horizontal state, lifted by 2 m in about 1 second, and then lowered in about 2 seconds and returned to the original position, which was repeated 5 times.
  • an integrated tuyere for converter was placed on a horizontal table, gas (air) was flowed through the double metal pipe 3 at a pressure of 0.1 MPa, and the gas flow rate was measured.
  • Example 1 the gas flow rate of Example 1 was set as 100 and displayed as an index.
  • the large gas flow rate after the handling test means that the deformation and damage of the double metal tube 3 in the handling test were small.
  • the thickness of the side plate 43 of the metal case 4 differs within the range of the present invention, but the gas flow rate index is 100 to 107, and the double metal tube 3 is not deformed or damaged. It was good.
  • the thickness of the side plate 43 of the metal case 4 was 3 mm, which was lower than the lower limit (6 mm) of the present invention, and the gas flow rate index was lowered to 65. This is because the double metal tube 3 was damaged and partly crushed by the handling test.
  • Example 4 the thickness of the bottom plate 41 of the metal case 4 was 6 mm, but the gas flow rate index was 97, and the double metal tube 3 was not deformed or damaged, which was good.
  • Comparative Example 2 the thickness of the bottom plate 41 of the metal case 4 was 3 mm, which was lower than the lower limit (6 mm) of the present invention, and the gas flow rate index was reduced to 84. This is because the double metal tube 3 was damaged and partly crushed by the handling test.
  • the lengths of the metal cases 4 differ within the scope of the present invention, but the index of the gas flow rate is 95 to 110, and no significant decrease in the gas flow rate is observed, which is good. there were.
  • the length of the metal case 4 was 1% of the total length of the tuyere refractory, which was less than the lower limit (3%) of the present invention, and the gas flow rate index decreased to 67. .. This is because the double metal tube 3 was damaged and partly crushed by the handling test.
  • Example 9 and Example 10 the thickness of the lower outer pipe 322 of the double metal pipe 3 was different within the range of the present invention, but the gas flow rate indexes were 100 and 105, which were good.
  • Comparative Example 4 the thickness of the lower outer pipe 322 of the double metal pipe 3 was 1.5 mm, which was lower than the lower limit (3 mm) of the present invention, and the index of gas flow rate decreased to 88. This is because the double metal tube 3 was damaged and partly crushed by the handling test.

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention provides an integrated tuyere for a converter, in which one double metal tube and a tuyere refractory are integrated, said integrated tuyere having a simple structure and suppressing deformation of the double metal tube upon installation in a converter and during handling and a reduction in the gas flow rate due to damage. The integrated tuyere for a converter according to the present invention is provided with: a double metal tube 3 which has an inner tube 31 and an outer tube 32, the inner tube 31 being loaded with a refractory 35; a tuyere refractory 2, in a through-hole in which 21 the double metal tube 3 is fixed with an adhesive 22 in between; and a metal case 4 which has a bottom plate 41 that covers the bottom face of the tuyere refractory 2 and a side plate 43 that covers a lower side face of the tuyere refractory 2. The metal case 4 has a thickness T of 6 to 20 mm and a length L of 3% to 50% of the total length of the tuyere refractory. The outer tube 32 of the double metal tube has an upper outer tube 321 and a lower outer tube 322. The lower outer tube 322 has a thickness of 3 mm or more and is welded/fixed to the bottom plate 41 of the metal case.

Description

転炉用一体型羽口Integrated tuyere for converter
　本発明は、製鋼用の転炉内にガスを吹き込むために、転炉の炉底に設ける羽口であって、内管内に耐火物が充填された二重金属管と羽口耐火物とを一体化した転炉用一体型羽口に関する。 The present invention is a tuyere provided at the bottom of a converter in order to blow gas into a converter for steelmaking, and a double metal pipe filled with a refractory in the inner pipe and a tuyere refractory are integrated. Regarding the integrated tuyere for converters.
　転炉の炉底には、ガスを吹き込むための耐火物として羽口が設けられている。この羽口には、使用する目的によっていくつかの種類がある。例えば転炉内の溶鋼の撹拌を主目的とする場合、複数の金属細管が耐火物に埋設された羽口や、内管内に耐火物が充填された二重管金属管を１本使用した羽口等がある。
　ここで、「内管内に耐火物が充填された二重金属管」とは、二重金属管の内側の金属管（内管）内に耐火物が充填され、内管と外側の金属管（外管）との隙間（スリット）がガス通路となるものである。なお、本明細書では、この「内管内に耐火物が充填された二重金属管」を単に「二重金属管」ともいう。 A tuyere is provided on the bottom of the converter as a refractory for blowing gas. There are several types of tuyere depending on the purpose of use. For example, when the main purpose is to agitate molten steel in a converter, a tuyere in which a plurality of metal thin tubes are embedded in a refractory, or a blade using a single double-tube metal tube in which the inner tube is filled with a refractory. There is a mouth etc.
Here, the "double metal pipe in which the inner pipe is filled with a fireproof material" means that the metal pipe (inner pipe) inside the double metal pipe is filled with a fireproof material, and the inner pipe and the outer metal pipe (outer pipe) are filled. ) And the gap (slit) is the gas passage. In the present specification, this "double metal pipe in which the inner pipe is filled with a refractory material" is also simply referred to as a "double metal pipe".
　複数の金属細管が耐火物に埋設された羽口としては、複数の金属細管と耐火物とが一体成形された一体型羽口が実用化されており、転炉への取り付けが簡単なため現場での施工性に優れている。 As a tuyere in which multiple metal thin tubes are embedded in a refractory, an integrated tuyere in which multiple metal thin tubes and a refractory are integrally molded has been put into practical use, and since it is easy to install in a converter, it is on-site. Excellent workability in.
　一方、特許文献１及び特許文献２には二重金属管が使用された羽口が開示されているが、これらの羽口は、現場施工時には、転炉内に施工された羽口耐火物の貫通孔にこの二重金属管を挿入し、その後、二重金属管を鉄皮へ固定しなければならず、取り付け作業に非常に手間を要する問題がある。
　また、二重金属管は中心部（内管内）に耐火物が充填されており、その内管内にはガスは流通しないことから、使用時に高温になり溶融しやすい。このため、溶融しても影響が小さくなるように金属管の厚みが１ｍｍ程度と薄くなっている。厚みの大きな二重金属管を使用した場合、使用中に稼動面側の金属管が溶融してスリットの幅が拡大することで、稼動面の損耗が早くなってしまうからである。
　このような従来の二重金属管と羽口耐火物とを一体成形しようとすると、金属管の厚みが１ｍｍ程度と薄いため成形時の圧力によって金属管が変形しやすくなり、しかも内管と外管との隙間（スリット）を１ｍｍ前後に均一に確保することが難しく、場合によってはスリットが潰れてしまうこともある。 On the other hand, Patent Document 1 and Patent Document 2 disclose tuyere in which a double metal pipe is used, and these tuyere penetrate the tuyere refractory constructed in the converter at the time of on-site construction. This double metal tube must be inserted into the hole, and then the double metal tube must be fixed to the iron skin, which causes a problem that the mounting work requires a great deal of time and effort.
Further, since the central part (inside the inner pipe) of the double metal pipe is filled with a refractory material and gas does not flow in the inner pipe, the temperature becomes high during use and it is easy to melt. Therefore, the thickness of the metal tube is as thin as about 1 mm so that the influence is small even if it melts. This is because when a double metal tube having a large thickness is used, the metal tube on the working surface side melts during use and the width of the slit is widened, so that the working surface is quickly worn.
When such a conventional double metal tube and a tuyere refractory are integrally molded, the thickness of the metal tube is as thin as about 1 mm, so that the metal tube is easily deformed by the pressure during molding, and the inner tube and the outer tube are easily deformed. It is difficult to uniformly secure a gap (slit) with and about 1 mm, and in some cases, the slit may be crushed.
　一方、特許文献３の羽口構造では、環状羽口は、内管と内管の内面側の耐火物充填層とからなる軸心部と、この軸心部の外側にリング状の間隙を隔てて固定される管体部とで構成され、そして、この環状羽口の周囲に、管体部と密着して羽口耐火物が施工された構造となっている。また、羽口耐火物は内張り耐火物とは分離され、羽口耐火物と環状羽口とが一体的に構成されていることが記載されている。
　このように引用文献３の羽口構造では、羽口耐火物と環状羽口とが一体的に構成されているが、羽口耐火物から環状羽口が突出しているため、転炉内への施工時やハンドリング時に、突出した環状羽口を把持して持ち上げたりあるいは物に当てたりすると、環状羽口が変形しリング状の間隔（スリット）が潰れてしまう可能性がある。スリットが潰れた場合には必要なガス流量が確保できなくなり、転炉の操業に支障を来たすことになる。 On the other hand, in the tuyere structure of Patent Document 3, the annular tuyere has a shaft core portion composed of an inner pipe and a fireproof material filling layer on the inner surface side of the inner pipe, and a ring-shaped gap on the outside of the shaft center portion. It is composed of a tubular part to be fixed, and a tuyere fireproof material is constructed around the annular tuyere in close contact with the tubular part. Further, it is described that the tuyere refractory is separated from the lining refractory, and the tuyere refractory and the annular tuyere are integrally formed.
As described above, in the tuyere structure of Cited Document 3, the tuyere refractory and the annular tuyere are integrally formed, but since the annular tuyere protrudes from the tuyere refractory, the annular tuyere is inserted into the converter. If the protruding annular tuyere is gripped and lifted or hit against an object during construction or handling, the annular tuyere may be deformed and the ring-shaped spacing (slit) may be crushed. If the slit is crushed, the required gas flow rate cannot be secured, which hinders the operation of the converter.
特許第４７６５３７２号公報Japanese Patent No. 4765372 特許第６０１１８０８号公報Japanese Patent No. 6011808 特開２００９－６８０９９号公報JP-A-2009-68099
　本発明が解決しようとする課題は、１本の二重金属管と羽口耐火物とを一体化した転炉用一体型羽口において、転炉内への施工時やハンドリング時の二重金属管の変形や損傷によるガス流量の低下を抑制し、しかも簡便な構造をした転炉用一体型羽口を提供することである。 The problem to be solved by the present invention is that in an integrated tuyere for a converter in which one double metal pipe and a tuyere refractory are integrated, the double metal pipe during construction and handling in the converter It is an object of the present invention to provide an integrated tuyere for a converter that suppresses a decrease in gas flow rate due to deformation or damage and has a simple structure.
　本発明によれば以下の転炉用一体型羽口が提供される。
１．
　同心円状に配置された内管と外管とを有し、内管内に耐火物が充填された１本の二重金属管と、
　二重金属管が接着材を介して貫通孔に固定された羽口耐火物と、
　羽口耐火物の下端面を覆いかつ二重金属管が貫通する底板と羽口耐火物の下部側面を覆う側板とを有する羽口耐火物に固定されたメタルケースとを具備し、
　メタルケースは、厚みが６ｍｍ以上２０ｍｍ以下、長さが羽口耐火物の全長の３％以上５０％以下であり、
　二重金属管の外管は上部外管と下部外管とを有し、下部外管は厚みが３ｍｍ以上であって上部外管よりも厚みが厚くなっており、この下部外管がメタルケースの底板に溶接固定されている、転炉用一体型羽口。
２．
　上部外管と下部外管とが一体化している、前記１に記載の転炉用一体型羽口。
３．
　上部外管と下部外管の境界部は、メタルケースの底板の上面と同じ高さ位置、又はメタルケースの底板の上面から上方に羽口耐火物の全長の４０％までの高さ位置にある、前記２に記載の転炉用一体型羽口。 According to the present invention, the following integrated tuyere for converter is provided.
1. 1.
A single double metal tube that has an inner tube and an outer tube arranged concentrically and the inner tube is filled with refractory.
A tuyere refractory in which a double metal tube is fixed to a through hole via an adhesive,
It is provided with a metal case fixed to the tuyere refractory having a bottom plate that covers the lower end surface of the tuyere refractory and through which a double metal tube penetrates and a side plate that covers the lower side surface of the tuyere refractory.
The metal case has a thickness of 6 mm or more and 20 mm or less, and a length of 3% or more and 50% or less of the total length of the tuyere refractory.
The outer tube of the double metal tube has an upper outer tube and a lower outer tube, and the lower outer tube has a thickness of 3 mm or more and is thicker than the upper outer tube. An integrated tuyere for converters that is welded and fixed to the bottom plate.
2.
The integrated tuyere for converter according to 1 above, wherein the upper outer pipe and the lower outer pipe are integrated.
3. 3.
The boundary between the upper outer pipe and the lower outer pipe is located at the same height as the upper surface of the bottom plate of the metal case, or at a height of up to 40% of the total length of the tuyere refractory upward from the upper surface of the bottom plate of the metal case. , The integrated tuyere for converter according to the above 2.
　本発明の転炉用一体型羽口によれば、羽口耐火物の下端面及び下部側面を覆うメタルケースの厚み及び長さを所定の範囲に限定すると共に、二重金属管の外管を上部外管とこの上部外管よりも厚みが厚い下部外管とで構成し、この下部外管をメタルケースの底板に溶接固定したことで、転炉内への施工時やハンドリング時に二重金属管が変形したり損傷したりすることを抑制できる。これにより、二重金属管の変形や損傷によるガス流量の低下を抑制でき、安定した流量でガスを吐出することができる。しかも、簡便な構造であり、転炉への取り付けも簡単で作業能率が向上する。 According to the integrated converter tuyere of the present invention, the thickness and length of the metal case covering the lower end surface and the lower side surface of the tuyere refractory are limited to a predetermined range, and the outer tube of the double metal tube is upper. It is composed of an outer pipe and a lower outer pipe that is thicker than this upper outer pipe, and by welding and fixing this lower outer pipe to the bottom plate of the metal case, a double metal pipe can be used during construction and handling inside the converter. It can prevent deformation and damage. As a result, it is possible to suppress a decrease in the gas flow rate due to deformation or damage of the double metal tube, and it is possible to discharge the gas at a stable flow rate. Moreover, it has a simple structure and is easy to install in a converter, improving work efficiency.
本発明の一実施形態である転炉用一体型羽口の概略縦断面図。Schematic vertical cross-sectional view of an integrated tuyere for a converter according to an embodiment of the present invention. 図１のＡ－Ａ拡大断面図。FIG. 1 is an enlarged cross-sectional view taken along the line AA of FIG. 図１の転炉用一体型羽口におけるメタルケース部分の拡大縦断面図。An enlarged vertical sectional view of a metal case portion of the integrated tuyere for converter in FIG. 1. 図１の転炉用一体型羽口におけるガス供給部の拡大縦断面図。1 Enlarged vertical cross-sectional view of the gas supply unit in the integrated tuyere for converter of FIG. 本発明の他の実施形態である転炉用一体型羽口におけるメタルケース部分の拡大縦断面図。An enlarged vertical sectional view of a metal case portion in an integrated tuyere for a converter according to another embodiment of the present invention. 本発明のさらに他の実施形態である転炉用一体型羽口におけるメタルケース部分の拡大縦断面図。An enlarged vertical sectional view of a metal case portion in an integrated tuyere for a converter according to still another embodiment of the present invention.
　図１に、本発明の一実施形態である転炉用一体型羽口１の全体構成を縦断面で概略的に示している。また、図２は図１のＡ－Ａ拡大断面図、図３はこの転炉用一体型羽口１におけるメタルケース４部分の拡大縦断面図である。
　図１及び図２に示すように、転炉用一体型羽口１は、平面視が長方形でメタルケース４部分を除いて四角錐台をした羽口耐火物２と、羽口耐火物２の下部に設けられたメタルケース４と、羽口耐火物２の貫通孔２１及びメタルケース４を貫通し、しかもメタルケース４に溶接固定された二重金属管３とを具備している。 FIG. 1 schematically shows the overall configuration of an integrated tuyere 1 for a converter according to an embodiment of the present invention in a vertical cross section. 2 is an enlarged cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is an enlarged vertical cross-sectional view of the metal case 4 portion of the integrated tuyere 1 for converter.
As shown in FIGS. 1 and 2, the integrated tuyere 1 for a converter has a tuyere refractory 2 having a rectangular plan view and a square cone except for the metal case 4, and a tuyere refractory 2. It includes a metal case 4 provided at the bottom, and a double metal tube 3 that penetrates the through hole 21 of the tuyere refractory 2 and the metal case 4 and is welded and fixed to the metal case 4.
　二重金属管３は、厚みが約１ｍｍの接着材２２を介して羽口耐火物２の貫通孔２１に固定されている。この二重金属管３の全長は１５００ｍｍである。図３に示すように、羽口耐火物２の下部は、メタルケース４と嵌合するために段差によって１辺の長さが小さな四角柱になっている。メタルケース４は、羽口耐火物２の下端面を覆う底板４１と、羽口耐火物２の下部側面を覆う側板４３とを有する。本実施形態において側板４３は角筒状に形成されており、この角筒状の側板４３が、長方形状の底板４１の上面４４に溶接固定されている。メタルケース４と羽口耐火物２の下部とは図示していないが接着材を介して接合されている。また図３に示すように、メタルケース４の底板４１の中央部には貫通孔４２があり、この貫通孔４２に二重金属管３が貫通し、その二重金属管３が底板４１に溶接固定されている。なお、本実施形態においてメタルケース４を構成する底板４１及び側板４３の厚みＴは１２ｍｍで、メタルケース４の長さＬは５０ｍｍ（羽口耐火物２の全長に対して５％）である。 The double metal tube 3 is fixed to the through hole 21 of the tuyere refractory 2 via an adhesive 22 having a thickness of about 1 mm. The total length of the double metal tube 3 is 1500 mm. As shown in FIG. 3, the lower portion of the tuyere refractory 2 is a square pillar having a small side length due to a step for fitting with the metal case 4. The metal case 4 has a bottom plate 41 that covers the lower end surface of the tuyere refractory 2, and a side plate 43 that covers the lower side surface of the tuyere refractory 2. In the present embodiment, the side plate 43 is formed in a square tubular shape, and the square tubular side plate 43 is welded and fixed to the upper surface 44 of the rectangular bottom plate 41. Although not shown, the metal case 4 and the lower part of the tuyere refractory 2 are joined via an adhesive. Further, as shown in FIG. 3, there is a through hole 42 in the central portion of the bottom plate 41 of the metal case 4, a double metal pipe 3 penetrates through the through hole 42, and the double metal pipe 3 is welded and fixed to the bottom plate 41. ing. In the present embodiment, the thickness T of the bottom plate 41 and the side plate 43 constituting the metal case 4 is 12 mm, and the length L of the metal case 4 is 50 mm (5% with respect to the total length of the tuyere refractory 2).
　ここで、二重金属管３及びメタルケース４はいずれも金属製であり、典型的にはＳＳ材（一般構造用圧延鋼材）、ＳＣ材（機械構造用炭素鋼鋼材）、ＳＴＫＭ材（機械構造用炭素鋼鋼管）などの鋼材製、あるいはステンレス鋼材製である。 Here, the double metal pipe 3 and the metal case 4 are all made of metal, and are typically SS material (rolled steel material for general structure), SC material (carbon steel material for machine structure), and STKM material (for machine structure). It is made of steel such as carbon steel pipe) or stainless steel.
　羽口耐火物２は全長が１０００ｍｍ、上端面は短辺が１００ｍｍ、長辺が１５０ｍｍの長方形、メタルケース４の側板４３の上端面と接する面における水平断面は短辺が１１０ｍｍ、長辺が１６０ｍｍの長方形、貫通孔２１の内径は２７ｍｍで、重量は５０ｋｇである。
　なお、本実施形態において羽口耐火物２の水平断面は長方形であるが、周囲に配置される炉底れんがの配置に応じて、台形、正方形、円形、扇形等の断面を有する羽口耐火物を使用することもできる。また、羽口耐火物２の全長は周囲の炉底れんがの長さに応じて決めればよい。 The tuyere refractory 2 has a total length of 1000 mm, an upper end surface is a rectangle with a short side of 100 mm and a long side of 150 mm, and the horizontal cross section of the surface of the metal case 4 in contact with the upper end surface of the side plate 43 is 110 mm for the short side and 160 mm for the long side. The rectangular shape of the hole 21 has an inner diameter of 27 mm and a weight of 50 kg.
Although the horizontal cross section of the tuyere refractory 2 is rectangular in the present embodiment, the tuyere refractory has a trapezoidal, square, circular, fan-shaped or other cross section depending on the arrangement of the furnace bottom bricks arranged around the tuyere refractory. Can also be used. Further, the total length of the tuyere refractory 2 may be determined according to the length of the surrounding furnace bottom brick.
　図２に示すように二重金属管３は、羽口耐火物２の貫通孔内２１に、内側の内管３１と外側の外管３２との中心軸が一致するように同心円状に配置されており、内管３１と外管３２との間にスリット３３が均等に形成されている。本実施形態においてスリット３３の厚みは１ｍｍ、内管３１の厚みは１.５ｍｍである。また本実施形態では、内管３１と外管３２との中心軸を一致させるため、内管３１の外周に周方向に均等な間隔で突起３４を設けている。なお、内管３１の外周の突起３４は、内管３１の外周の長手方向（上下方向）に金属製のワイヤーを溶接したり、厚みの厚い内管を素材として外周を溝状に削り込む等により設けることができる。
　内管３１の内側には耐火物３５が充填されている。また、外管３２と羽口耐火物２との間（貫通孔２１）には接着材２２が充填されている。 As shown in FIG. 2, the double metal pipe 3 is arranged concentrically in the through hole 21 of the tuyere refractory 2 so that the central axes of the inner inner pipe 31 and the outer outer pipe 32 coincide with each other. The slit 33 is evenly formed between the inner pipe 31 and the outer pipe 32. In the present embodiment, the thickness of the slit 33 is 1 mm, and the thickness of the inner tube 31 is 1.5 mm. Further, in the present embodiment, in order to align the central axes of the inner pipe 31 and the outer pipe 32, protrusions 34 are provided on the outer periphery of the inner pipe 31 at equal intervals in the circumferential direction. The protrusion 34 on the outer circumference of the inner pipe 31 is formed by welding a metal wire in the longitudinal direction (vertical direction) of the outer circumference of the inner pipe 31, or cutting the outer circumference into a groove shape using a thick inner pipe as a material. Can be provided by
The inside of the inner pipe 31 is filled with a refractory material 35. Further, the adhesive material 22 is filled between the outer pipe 32 and the tuyere refractory material 2 (through hole 21).
　図３に示すように、二重金属管３の外管３２は上部外管３２１と下部外管３２２とからなり、上部外管３２１の下端と下部外管３２２の上端とが溶接によって接合されて一体化している。本実施形態において、上部外管３２１と下部外管３２２との境界部３６はメタルケース４の底板４１の上面４４と同じ高さ位置にある。また本実施形態において、上部外管３２１の厚みは１ｍｍ、下部外管３２２の厚みは５．５ｍｍである。ただし、内管３１と上部外管３２１との隙間、及び内管３１と下部外管３２２との隙間、すなわちスリット３３の厚みは等しくなっている。 As shown in FIG. 3, the outer pipe 32 of the double metal pipe 3 is composed of an upper outer pipe 321 and a lower outer pipe 322, and the lower end of the upper outer pipe 321 and the upper end of the lower outer pipe 322 are joined and integrated by welding. It has become. In the present embodiment, the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 is located at the same height as the upper surface 44 of the bottom plate 41 of the metal case 4. Further, in the present embodiment, the thickness of the upper outer tube 321 is 1 mm, and the thickness of the lower outer tube 322 is 5.5 mm. However, the gap between the inner pipe 31 and the upper outer pipe 321 and the gap between the inner pipe 31 and the lower outer pipe 322, that is, the thickness of the slit 33 is the same.
　図４は、図１の転炉用一体型羽口１において二重金属管３にガスを供給するガス供給部５の拡大縦断面図である。同図に示すように本実施形態では、ガス供給部５として、二重金属管３（下部外管３２１）の外径よりやや大きな内径を有し、ガス配管（図示省略）とのソケット連結部５２を備える連結管５１が二重金属管３の途中に設けられている。なお、連結管５１と下部外管３２１との隙間は溶接によってシールされている。ソケット連結部５２に供給されたガスは連結管５１を介して、下部外管３２２と連結管５１との間に設けたガス導入口３２３から内管３１と下部外管３２２との隙間すなわちスリット３３内に導入される。 FIG. 4 is an enlarged vertical cross-sectional view of the gas supply unit 5 that supplies gas to the double metal pipe 3 in the integrated tuyere 1 for converter in FIG. As shown in the figure, in the present embodiment, the gas supply unit 5 has an inner diameter slightly larger than the outer diameter of the double metal pipe 3 (lower outer pipe 321), and the socket connecting portion 52 with the gas pipe (not shown). A connecting pipe 51 is provided in the middle of the double metal pipe 3. The gap between the connecting pipe 51 and the lower outer pipe 321 is sealed by welding. The gas supplied to the socket connecting portion 52 passes through the connecting pipe 51 from the gas introduction port 323 provided between the lower outer pipe 322 and the connecting pipe 51 to the gap between the inner pipe 31 and the lower outer pipe 322, that is, the slit 33. Introduced in.
　次に、本発明の一実施形態である転炉用一体型羽口１の製造方法について説明する。まず、羽口耐火物２は、マグネシア及び鱗状黒鉛を主原料とする耐火原料配合物にフェノール樹脂等のバインダーを添加して混練後、加圧成形、熱処理して得ることができる。貫通孔２１は成形時に埋設した心棒を成形後に引き抜くか、熱処理後にボーリング加工して設けることができる。二重金属管３は、その外面に接着材２２を塗布して貫通孔２１に挿入することで貫通孔２１に装着固定することができる。メタルケース４は、接着材を介して羽口耐火物２の下部に接合することができる。その後、二重金属管３の下部外管３２２をメタルケース４の底板４１に溶接固定することで、転炉用一体型羽口１を製造することができる。 Next, a method for manufacturing the integrated tuyere 1 for a converter, which is an embodiment of the present invention, will be described. First, the tuyere refractory material 2 can be obtained by adding a binder such as a phenol resin to a refractory raw material mixture containing magnesia and scaly graphite as main raw materials, kneading the refractory material 2, and then pressure-molding and heat-treating the material. The through hole 21 can be provided by pulling out the mandrel embedded at the time of molding after molding or boring after heat treatment. The double metal tube 3 can be mounted and fixed in the through hole 21 by applying an adhesive 22 to the outer surface thereof and inserting the double metal tube 3 into the through hole 21. The metal case 4 can be joined to the lower part of the tuyere refractory 2 via an adhesive. After that, the lower outer pipe 322 of the double metal pipe 3 is welded and fixed to the bottom plate 41 of the metal case 4, so that the integrated tuyere 1 for converter can be manufactured.
　ここで、二重金属管３と羽口耐火物２との間、及びメタルケース４と羽口耐火物２との間に使用する接着材としては、有機性接着材あるいは無機系接着材のみ、あるいはこれらに耐火性粉末を添加したものを使用することができる。具体例としては、アクリル樹脂系、ウレタン樹脂系、エポキシ樹脂系、フェノール樹脂系、珪酸ソーダ系、セメント系、シリカゾル系などの接着材の１種又は２種以上、あるいはこれらに金属酸化物粉末や金属粉末などの耐火性粉末を添加したものである。本実施形態では、二重金属管３と羽口耐火物２との間にはマグネシア粉末を含有するフェノール樹脂を使用し、メタルケース４と羽口耐火物２との間にはエポキシ樹脂系接着材を使用した。なお、二重金属管３と羽口耐火物２との間の接着材は、耐火性粉末を含有する接着材とすることでより稼動面の損耗を抑制することができる。 Here, as the adhesive used between the double metal tube 3 and the tuyere refractory material 2 and between the metal case 4 and the tuyere refractory material 2, only an organic adhesive material or an inorganic adhesive material, or Those to which a refractory powder is added can be used. Specific examples include one or more types of adhesives such as acrylic resin-based, urethane resin-based, epoxy resin-based, phenol resin-based, sodium silicate-based, cement-based, and silica sol-based adhesives, or metal oxide powders and the like. It is the one to which fire-resistant powder such as metal powder is added. In the present embodiment, a phenol resin containing magnesia powder is used between the double metal tube 3 and the tuyere refractory 2, and an epoxy resin adhesive is used between the metal case 4 and the tuyere refractory 2. It was used. The adhesive between the double metal tube 3 and the tuyere refractory 2 can be made of an adhesive containing a refractory powder to further suppress wear on the working surface.
　このように本実施形態の転炉用一体型羽口１の製造方法では、加圧成形された後の羽口耐火物２の貫通孔２１に二重金属管３を接着材を介して装着固定するため、厚みの薄い二重金属管３を使用しても、転炉用一体型羽口１の製造時に二重金属管３の変形やスリットのつぶれが発生することはない。 As described above, in the method for manufacturing the integrated converter tuyere 1 of the present embodiment, the double metal tube 3 is attached and fixed to the through hole 21 of the tuyere refractory after pressure molding via an adhesive material. Therefore, even if the double metal tube 3 having a thin thickness is used, the double metal tube 3 is not deformed or the slit is not crushed during the production of the integrated tuyere 1 for converter.
　ここで、メタルケース４は、転炉用一体型羽口１を吊り上げる場合や水平に保持したときに、羽口耐火物２がメタルケース４から外れるようにずれて、内部の二重金属管３が変形することを防止するために設けている。このため、メタルケース４の厚みＴは、転炉用一体型羽口１を吊り上げる場合や水平に保持したときに、羽口耐火物２がずれないように羽口耐火物２を保持できる程度の厚みが必要であり、具体的には６ｍｍ以上２０ｍｍ以下とすることができる。メタルケース４の厚みＴが６ｍｍ未満では羽口耐火物がずれて二重金属管３が変形する場合があり、２０ｍｍを超えると重くなるためハンドリングし難くなる。 Here, in the metal case 4, when the integrated tuyere 1 for converter is lifted or held horizontally, the tuyere refractory 2 is displaced so as to be detached from the metal case 4, and the double metal tube 3 inside is displaced. It is provided to prevent deformation. Therefore, the thickness T of the metal case 4 is such that the tuyere refractory 2 can be held so that the tuyere refractory 2 does not shift when the converter integrated tuyere 1 is lifted or held horizontally. A thickness is required, and specifically, it can be 6 mm or more and 20 mm or less. If the thickness T of the metal case 4 is less than 6 mm, the tuyere refractory may shift and the double metal tube 3 may be deformed, and if it exceeds 20 mm, it becomes heavy and difficult to handle.
　メタルケース４の長さＬは、羽口耐火物２の長さに応じて適切な長さとすることができ、具体的には羽口耐火物２の全長の３％以上、好ましくは５％以上とすることができる。メタルケース４の長さＬが羽口耐火物２の全長の３％未満では羽口耐火物２がずれて二重金属管３が変形したりあるいは羽口耐火物２が落下しやすくなる。メタルケース２の長さＬの上限は特に限定しなくてもよいが、長すぎると転炉用一体型羽口１が重くなりすぎてハンドリング性が悪くなることなどを考慮して、羽口耐火物２の全長の５０％以下とすることができ、さらには羽口耐火物２の全長の３０％以下としても十分である。 The length L of the metal case 4 can be an appropriate length according to the length of the tuyere refractory, specifically, 3% or more, preferably 5% or more of the total length of the tuyere refractory 2. Can be. If the length L of the metal case 4 is less than 3% of the total length of the tuyere refractory 2, the tuyere refractory 2 is displaced and the double metal tube 3 is deformed, or the tuyere refractory 2 is likely to fall. The upper limit of the length L of the metal case 2 does not have to be particularly limited, but if it is too long, the tuyere fire resistance will be deteriorated in consideration of the fact that the integrated tuyere 1 for converter becomes too heavy and the handleability deteriorates. It can be 50% or less of the total length of the object 2, and further, 30% or less of the total length of the tuyere refractory object 2 is sufficient.
　また、図３に示すように、二重金属管３の下部外管３２２は上部外管３２１より厚みが大きいため、二重金属管３を把持して転炉用一体型羽口１を水平状態で吊り上げても、二重金属管３が変形することを抑制できる。下部外管３２２の厚みは、使用する羽口耐火物２の大きさに応じて、転炉用一体型羽口１の二重金属管３を把持して水平状態に維持しても二重金属管３が変形しない程度の厚みとすればよく、具体的には３ｍｍ以上とすることができる。下部外管３２２の厚みが３ｍｍ未満では転炉用一体型羽口１の二重金属管３に力が加わった際に変形する場合がある。下部外管の厚みの上限は特に設けないが、厚みが厚すぎると転炉一体型羽口が重くなるためハンドリングに問題がある場合には１０ｍｍ以下とすることができる。 Further, as shown in FIG. 3, since the lower outer pipe 322 of the double metal pipe 3 is thicker than the upper outer pipe 321, the double metal pipe 3 is gripped and the integrated tuyere 1 for converter is lifted in a horizontal state. However, it is possible to prevent the double metal tube 3 from being deformed. The thickness of the lower outer pipe 322 depends on the size of the tuyere refractory material 2 to be used, even if the double metal pipe 3 of the integrated tuyere 1 for converter is gripped and maintained in a horizontal state. The thickness may be set so as not to be deformed, and specifically, it can be 3 mm or more. If the thickness of the lower outer pipe 322 is less than 3 mm, it may be deformed when a force is applied to the double metal pipe 3 of the integrated tuyere 1 for converter. The upper limit of the thickness of the lower outer pipe is not particularly set, but if the thickness is too thick, the converter integrated tuyere becomes heavy, and if there is a problem in handling, it can be set to 10 mm or less.
　本実施形態では上述のとおり、上部外管３２１と下部外管３２２とは溶接接合されて一体化し１本の金属管になっているため、二重金属管３を羽口耐火物２及びメタルケース４へ簡便に取り付けることができ、製造時の作業能率が向上する。しかも下部外管３２２と内管３１との隙間（スリット３３）の厚みを変えずに下部外管３２２の外径を大きくすることでその厚みを大きくしているため、下部外管３２２の外径は、上部外管３２１と一体化せずに分離した場合（後述する図６）に比べて小さくなっている。このように、下部外管３２２の外径が小さいため、下部外管３２２の下部に設けたガス供給部５も小さくすることができる。このため築炉時の取り扱いに優れることになる。また、全体の重量を軽くすることができる。 In the present embodiment, as described above, since the upper outer pipe 321 and the lower outer pipe 322 are welded and joined to form one metal pipe, the double metal pipe 3 is combined with the tuyere refractory material 2 and the metal case 4. It can be easily attached to and the work efficiency at the time of manufacturing is improved. Moreover, since the thickness of the lower outer pipe 322 is increased by increasing the outer diameter of the lower outer pipe 322 without changing the thickness of the gap (slit 33) between the lower outer pipe 322 and the inner pipe 31, the outer diameter of the lower outer pipe 322 is increased. Is smaller than the case where it is separated without being integrated with the upper outer pipe 321 (FIG. 6 described later). Since the outer diameter of the lower outer pipe 322 is small as described above, the gas supply unit 5 provided in the lower part of the lower outer pipe 322 can also be made smaller. Therefore, it is excellent in handling at the time of furnace construction. In addition, the overall weight can be reduced.
　一方、二重金属管３の上部外管３２１の厚みは厚くする必要がなく十分薄くできるため、使用中に金属管（内管３１及び上部外管３２１）が溶けてスリット３３の幅が広がった場合でも稼動面の損耗が早くなってしまうことを抑制することができる。さらに金属管（内管３１及び上部外管３２１）の厚みを十分小さくすることができるのでスリット３３の幅を小さく維持することができ、スリット３３内へ溶鋼が進入することも抑制することができる。
　具体的には、内管３１及び上部外管３２１の厚みは０．５ｍｍ以上３ｍｍ以下とすることができる。内管３１及び上部外管３２１の厚みが０．５ｍｍ未満では製造時のハンドリング中の変形などで作業性が悪くなり、３ｍｍを超えると使用時に溶融しやすくなる。 On the other hand, the thickness of the upper outer pipe 321 of the double metal pipe 3 does not need to be thickened and can be made sufficiently thin. Therefore, when the metal pipes (inner pipe 31 and upper outer pipe 321) are melted during use and the width of the slit 33 is widened. However, it is possible to prevent the working surface from being worn out too quickly. Further, since the thickness of the metal pipe (inner pipe 31 and upper outer pipe 321) can be sufficiently reduced, the width of the slit 33 can be kept small, and the intrusion of molten steel into the slit 33 can be suppressed. ..
Specifically, the thickness of the inner pipe 31 and the upper outer pipe 321 can be 0.5 mm or more and 3 mm or less. If the thickness of the inner pipe 31 and the upper outer pipe 321 is less than 0.5 mm, workability deteriorates due to deformation during handling during manufacturing, and if it exceeds 3 mm, it tends to melt during use.
　上部外管３２１と下部外管３２２の境界部３６の高さ位置は、本実施形態のようにメタルケース４の底板４１の上面４４と同じ高さ位置とするか、又はメタルケース４の底板４１の上面４４から上方に羽口耐火物２の全長の４０％までの高さ位置とすることが好ましく、より好ましくはメタルケース４の底板４１の上面４４から上方に羽口耐火物２の全長の１０％までの高さ位置とすることができる。
　このように、上部外管３２１と下部外管３２２の境界部３６の高さ位置が、メタルケース４の底板４１の上面４４と同じ高さ位置、又はメタルケース４の底板４１の上面４４より上方にあることで、二重金属管３を持ってハンドリングする際に二重金属管３が曲がることをさらに抑制することができる。なお、上部外管３２１と下部外管３２２の境界部３６の高さ位置の上限は特に限定しなくてもよいが、メタルケース４の底板４１の上面４４から上方に羽口耐火物２の全長の４０％の長さを超えた場合には、羽口耐火物２が使用中に損耗することで溶鋼と接触する可能性があることから、羽口耐火物２の全長の４０％までの高さ位置とすることが好ましく、より好ましくは羽口耐火物２の全長の１０％までの高さ位置とすることができる。
　なお、上部外管３２１と下部外管３２２の境界部３６の高さ位置がメタルケース４の底板４１の下面４５よりも下方にある場合には、二重金属管３を持ってハンドリングする際に二重金属管３が曲がる可能性が高くなる。この点、本発明では下部外管３２１はメタルケース４の底板４１に溶接固定されるから、上部外管３２１と下部外管３２２の境界部３６の高さ位置がメタルケース４の底板４１の下面４５よりも下方になることはない、 The height position of the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 is set to the same height position as the upper surface 44 of the bottom plate 41 of the metal case 4 as in the present embodiment, or the bottom plate 41 of the metal case 4 is set. It is preferable that the height is up to 40% of the total length of the tuyere refractory 2 upward from the upper surface 44 of the metal case 4, and more preferably the total length of the tuyere refractory 2 is upward from the upper surface 44 of the bottom plate 41 of the metal case 4. The height position can be up to 10%.
In this way, the height position of the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 is the same height position as the upper surface 44 of the bottom plate 41 of the metal case 4, or above the upper surface 44 of the bottom plate 41 of the metal case 4. Therefore, it is possible to further prevent the double metal tube 3 from bending when the double metal tube 3 is held and handled. The upper limit of the height position of the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 does not have to be particularly limited, but the total length of the tuyere refractory 2 is upward from the upper surface 44 of the bottom plate 41 of the metal case 4. If the length exceeds 40% of the total length of the tuyere refractory 2, the tuyere refractory 2 may wear out during use and come into contact with molten steel. It is preferably in the vertical position, and more preferably in the height position up to 10% of the total length of the tuyere refractory.
If the height position of the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 is lower than the lower surface 45 of the bottom plate 41 of the metal case 4, the double metal pipe 3 is held and handled. The heavy metal tube 3 is more likely to bend. In this respect, in the present invention, since the lower outer pipe 321 is welded and fixed to the bottom plate 41 of the metal case 4, the height position of the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 is the lower surface of the bottom plate 41 of the metal case 4. Never below 45,
　二重金属管３の外径及びスリット３３の厚みは、吹き込むガスの流量と転炉に設置する羽口の数などによって適宜決められるが、羽口れんがの製造のしやすさと耐用性、さらにはガスの流量を確保しやすい点から、二重金属管３の外径は２０ｍｍ以上６０ｍｍ以下、スリット３３の厚みは０．５ｍｍ以上３ｍｍ以下とすることができる。
　また、二重金属管３のメタルケース４から突出した部分の長さは、転炉の鉄皮の厚みやガス配管の位置などによって決まるが、長すぎると変形しやすくなるため最大で１０００ｍｍ程度とすることが好ましく、最低では２００ｍｍ程度とすることができる。 The outer diameter of the double metal tube 3 and the thickness of the slit 33 are appropriately determined depending on the flow rate of the gas to be blown and the number of tuyere installed in the converter. The outer diameter of the double metal tube 3 can be 20 mm or more and 60 mm or less, and the thickness of the slit 33 can be 0.5 mm or more and 3 mm or less from the viewpoint of easily securing the flow rate of the double metal tube 3.
The length of the portion of the double metal pipe 3 protruding from the metal case 4 is determined by the thickness of the iron skin of the converter, the position of the gas pipe, etc., but if it is too long, it is easily deformed, so the maximum length is about 1000 mm. It is preferable, and it can be at least about 200 mm.
　図５は、本発明の他の実施形態である転炉用一体型羽口におけるメタルケース部分の拡大縦断面図である。この実施形態では、上部外管３２１と下部外管３２２の境界部３６の高さ位置が、メタルケース４の底板４１の上面４４から上方に２０ｍｍの高さ位置（羽口耐火物２の全長の２％）にある。これに合わせて羽口耐火物２の貫通孔２１は、下側が拡大する段差形状としている。なお、この実施形態においても先の実施形態と同様に、上部外管３２１と下部外管３２２とは溶接によって接合されて一体化している。 FIG. 5 is an enlarged vertical sectional view of a metal case portion of an integrated tuyere for a converter according to another embodiment of the present invention. In this embodiment, the height position of the boundary portion 36 between the upper outer pipe 321 and the lower outer pipe 322 is 20 mm above the upper surface 44 of the bottom plate 41 of the metal case 4 (the total length of the tuyere refractory 2). 2%). In line with this, the through hole 21 of the tuyere refractory 2 has a stepped shape in which the lower side expands. In this embodiment as well, as in the previous embodiment, the upper outer pipe 321 and the lower outer pipe 322 are joined and integrated by welding.
　図６は、本発明のさらに他の実施形態である転炉用一体型羽口におけるメタルケース部分の拡大縦断面図である。この実施形態では、二重金属管３の外管３２の上部外管３２１と下部外管３２２とが一体化されずに分離されている。すなわち、メタルケース４の底板４１の下面４５に下部外管３２２の上端面が溶接固定され、上部外管３２１は底板４１の貫通孔４２に貫入し、その貫入部の上部が底板４１に溶接固定されている。 FIG. 6 is an enlarged vertical sectional view of a metal case portion of an integrated tuyere for a converter, which is still another embodiment of the present invention. In this embodiment, the upper outer pipe 321 and the lower outer pipe 322 of the outer pipe 32 of the double metal pipe 3 are separated without being integrated. That is, the upper end surface of the lower outer pipe 322 is welded and fixed to the lower surface 45 of the bottom plate 41 of the metal case 4, the upper outer pipe 321 penetrates into the through hole 42 of the bottom plate 41, and the upper part of the penetration portion is welded and fixed to the bottom plate 41. Has been done.
　図１から図４に示す転炉用一体型羽口の実施形態において、メタルケース４の厚みＴ、メタルケース４の長さＬ、及び二重金属管３の下部外管３２２の厚みが異なる条件として、それぞれ転炉用一体型羽口のハンドリング試験を行った結果を表１に示す。なお、メタルケース４の材質はＳＳ４００、二重金属管３の材質は内管３１及び上部外管３２１がＳＵＳ３０４、下部外管３２２がＳＴＫＭである。
　ハンドリング試験では、転炉用一体型羽口のメタルケース４の底板４１から突出している二重金属配管３を、メタルケース４の底板４１からその突出部の全長の１／３の位置と後端部の２点をクレーンで水平になるように保持し、水平な状態を維持して約１秒で２ｍ吊り上げた後、約２秒で下降してもとの位置に戻す操作を５回繰り返した。その後、クレーンから離して水平台の上に転炉用一体型羽口を置き二重金属管３に０．１ＭＰａの圧力でガス（空気）を流し、ガス流量を測定した。そして実施例１のガス流量を１００として指数で表示した。この指数が大きいほどガス流量が大きいということであり、この指数が９５以上を合格とした。なお、ハンドリング試験後のガス流量が大きいということは、ハンドリング試験による二重金属管３の変形や損傷が小さかったということである。 In the embodiment of the integrated tuyere for converter shown in FIGS. 1 to 4, the condition that the thickness T of the metal case 4, the length L of the metal case 4, and the thickness of the lower outer tube 322 of the double metal tube 3 are different is satisfied. Table 1 shows the results of handling tests of the integrated tuyere for converters. The material of the metal case 4 is SS400, the material of the double metal tube 3 is SUS304 for the inner tube 31 and the upper outer tube 321 and STKM for the lower outer tube 322.
In the handling test, the double metal pipe 3 protruding from the bottom plate 41 of the metal case 4 of the integrated tuyere for the converter was placed at the position of 1/3 of the total length of the protruding part from the bottom plate 41 of the metal case 4 and the rear end. The two points were held horizontally by a crane, maintained in a horizontal state, lifted by 2 m in about 1 second, and then lowered in about 2 seconds and returned to the original position, which was repeated 5 times. Then, apart from the crane, an integrated tuyere for converter was placed on a horizontal table, gas (air) was flowed through the double metal pipe 3 at a pressure of 0.1 MPa, and the gas flow rate was measured. Then, the gas flow rate of Example 1 was set as 100 and displayed as an index. The larger this index is, the larger the gas flow rate is, and when this index is 95 or more, it is regarded as passing. The large gas flow rate after the handling test means that the deformation and damage of the double metal tube 3 in the handling test were small.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　実施例１から実施例３は、メタルケース４の側板４３の厚みが本発明の範囲内で異なるものであるが、ガス流量の指数は１００～１０７であり二重金属管３の変形や損傷はなく良好であった。これに対して比較例１は、メタルケース４の側板４３の厚みが３ｍｍと本発明の下限値（６ｍｍ）を下回るものであり、ガス流量の指数が６５と低下した。これは、ハンドリング試験により二重金属管３が損傷し一部が潰れたためである。 In Examples 1 to 3, the thickness of the side plate 43 of the metal case 4 differs within the range of the present invention, but the gas flow rate index is 100 to 107, and the double metal tube 3 is not deformed or damaged. It was good. On the other hand, in Comparative Example 1, the thickness of the side plate 43 of the metal case 4 was 3 mm, which was lower than the lower limit (6 mm) of the present invention, and the gas flow rate index was lowered to 65. This is because the double metal tube 3 was damaged and partly crushed by the handling test.
　実施例４は、メタルケース４の底板４１の厚みが６ｍｍの場合であるが、ガス流量の指数は９７であり二重金属管３の変形や損傷はなく良好であった。これに対して比較例２は、メタルケース４の底板４１の厚みが３ｍｍと本発明の下限値（６ｍｍ）を下回るものであり、ガス流量の指数が８４と低下した。これは、ハンドリング試験により二重金属管３が損傷し一部が潰れたためである。 In Example 4, the thickness of the bottom plate 41 of the metal case 4 was 6 mm, but the gas flow rate index was 97, and the double metal tube 3 was not deformed or damaged, which was good. On the other hand, in Comparative Example 2, the thickness of the bottom plate 41 of the metal case 4 was 3 mm, which was lower than the lower limit (6 mm) of the present invention, and the gas flow rate index was reduced to 84. This is because the double metal tube 3 was damaged and partly crushed by the handling test.
　実施例５から実施例８は、メタルケース４の長さが本発明の範囲内で異なるものであるが、ガス流量の指数は９５～１１０でありガス流量の大幅な低下は見られず良好であった。これに対して比較例３は、メタルケース４の長さが羽口耐火物の全長の１％と本発明の下限値（３％）を下回るものであり、ガス流量の指数が６７と低下した。これは、ハンドリング試験により二重金属管３が損傷し一部が潰れたためである。 In Examples 5 to 8, the lengths of the metal cases 4 differ within the scope of the present invention, but the index of the gas flow rate is 95 to 110, and no significant decrease in the gas flow rate is observed, which is good. there were. On the other hand, in Comparative Example 3, the length of the metal case 4 was 1% of the total length of the tuyere refractory, which was less than the lower limit (3%) of the present invention, and the gas flow rate index decreased to 67. .. This is because the double metal tube 3 was damaged and partly crushed by the handling test.
　実施例９と実施例１０は、二重金属管３の下部外管３２２の厚みが本発明の範囲内で異なるものであるが、ガス流量の指数は１００と１０５であり良好であった。これに対して比較例４は、二重金属管３の下部外管３２２の厚み１．５ｍｍと本発明の下限値（３ｍｍ）を下回るものであり、ガス流量の指数が８８と低下した。これは、ハンドリング試験により二重金属管３が損傷し一部が潰れたためである。 In Example 9 and Example 10, the thickness of the lower outer pipe 322 of the double metal pipe 3 was different within the range of the present invention, but the gas flow rate indexes were 100 and 105, which were good. On the other hand, in Comparative Example 4, the thickness of the lower outer pipe 322 of the double metal pipe 3 was 1.5 mm, which was lower than the lower limit (3 mm) of the present invention, and the index of gas flow rate decreased to 88. This is because the double metal tube 3 was damaged and partly crushed by the handling test.
　１　転炉用一体型羽口
　２　羽口耐火物
　２１　貫通孔
　２２　接着材
　３　二重金属管
　３１　内管
　３２　外管
　３２１　上部外管
　３２２　下部外管
　３２３　ガス導入口
　３３　スリット
　３４　突起
　３５　耐火物
　３６　境界部
　４　メタルケース
　４１　底板
　４２　貫通孔
　４３　側板
　４４　底板の上面
　４５　底板の下面
　５　ガス供給部
　５１　連結管
　５２　ソケット連結部 1 Integrated tuyere for converter 2 Tuft refractory 21 Through hole 22 Adhesive material 3 Double metal pipe 31 Inner pipe 32 Outer pipe 321 Upper outer pipe 322 Lower outer pipe 323 Gas inlet 33 Slit 34 Protrusion 35 Refractory 36 Boundary Part 4 Metal case 41 Bottom plate 42 Through hole 43 Side plate 44 Top surface of bottom plate 45 Bottom surface of bottom plate 5 Gas supply part 51 Connection pipe 52 Socket connection part

Claims (3)

  1. 　同心円状に配置された内管と外管とを有し、内管内に耐火物が充填された１本の二重金属管と、
    　二重金属管が接着材を介して貫通孔に固定された羽口耐火物と、
    　羽口耐火物の下端面を覆いかつ二重金属管が貫通する底板と羽口耐火物の下部側面を覆う側板とを有する羽口耐火物に固定されたメタルケースとを具備し、
    　メタルケースは、厚みが６ｍｍ以上２０ｍｍ以下、長さが羽口耐火物の全長の３％以上５０％以下であり、
    　二重金属管の外管は上部外管と下部外管とを有し、下部外管は厚みが３ｍｍ以上であって上部外管よりも厚みが厚くなっており、この下部外管がメタルケースの底板に溶接固定されている、転炉用一体型羽口。     A single double metal tube that has an inner tube and an outer tube arranged concentrically and the inner tube is filled with refractory.
    A tuyere refractory in which a double metal tube is fixed to a through hole via an adhesive,
    It is provided with a metal case fixed to the tuyere refractory having a bottom plate that covers the lower end surface of the tuyere refractory and through which a double metal tube penetrates and a side plate that covers the lower side surface of the tuyere refractory.
    The metal case has a thickness of 6 mm or more and 20 mm or less, and a length of 3% or more and 50% or less of the total length of the tuyere refractory.
    The outer tube of the double metal tube has an upper outer tube and a lower outer tube, and the lower outer tube has a thickness of 3 mm or more and is thicker than the upper outer tube. An integrated tuyere for converters that is welded and fixed to the bottom plate.
  2. 　上部外管と下部外管とが一体化している、請求項１に記載の転炉用一体型羽口。 The integrated tuyere for converter according to claim 1, wherein the upper outer pipe and the lower outer pipe are integrated.
  3. 　上部外管と下部外管の境界部は、メタルケースの底板の上面と同じ高さ位置、又はメタルケースの底板の上面から上方に羽口耐火物の全長の４０％までの高さ位置にある、請求項２に記載の転炉用一体型羽口。 The boundary between the upper outer pipe and the lower outer pipe is located at the same height as the upper surface of the bottom plate of the metal case, or at a height up to 40% of the total length of the tuyere refractory from the upper surface of the bottom plate of the metal case. , The integrated tuyere for converter according to claim 2.
PCT/JP2021/006825 2020-03-04 2021-02-24 Integrated tuyere for converter WO2021177101A1 (en)

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JPS579820A (en) * 1980-06-20 1982-01-19 Sumitomo Metal Ind Ltd Tuyere for refining of molten metal
JPS5785940A (en) * 1980-11-14 1982-05-28 Sumitomo Metal Ind Ltd Tuyere for refining molten metal
JPS57121668U (en) * 1981-01-19 1982-07-28
JP2006283065A (en) * 2005-03-31 2006-10-19 Jfe Steel Kk Gas-blowing tuyere
JP2009068099A (en) 2007-09-18 2009-04-02 Jfe Steel Kk Structure for gas-blowing tuyere in refining vessel
JP4765372B2 (en) 2005-03-31 2011-09-07 Ｊｆｅスチール株式会社 Gas blown tuyere
JP6011808B2 (en) 2013-11-21 2016-10-19 Ｊｆｅスチール株式会社 Annular tuyere for gas injection

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Publication number Priority date Publication date Assignee Title
US4449701A (en) * 1982-08-23 1984-05-22 Pennsylvania Engineering Corporation Tuyere for the injection of gases into a metallurgical vessel
JP6892063B2 (en) * 2018-03-29 2021-06-18 東京窯業株式会社 Gas blowing plug
CN109628687A (en) * 2018-12-30 2019-04-16 钢铁研究总院 A method of preventing converter bottom blowing gas-feeding element tuyere position bleed-out

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS579820A (en) * 1980-06-20 1982-01-19 Sumitomo Metal Ind Ltd Tuyere for refining of molten metal
JPS5785940A (en) * 1980-11-14 1982-05-28 Sumitomo Metal Ind Ltd Tuyere for refining molten metal
JPS57121668U (en) * 1981-01-19 1982-07-28
JP2006283065A (en) * 2005-03-31 2006-10-19 Jfe Steel Kk Gas-blowing tuyere
JP4765372B2 (en) 2005-03-31 2011-09-07 Ｊｆｅスチール株式会社 Gas blown tuyere
JP2009068099A (en) 2007-09-18 2009-04-02 Jfe Steel Kk Structure for gas-blowing tuyere in refining vessel
JP6011808B2 (en) 2013-11-21 2016-10-19 Ｊｆｅスチール株式会社 Annular tuyere for gas injection

Non-Patent Citations (1)

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Title
See also references of EP4071254A4

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