WO2020195840A1 - エレクトロスラグ再溶解法に用いられるフラックス、そのフラックスの製造方法および高純度鋼の製造方法 - Google Patents

エレクトロスラグ再溶解法に用いられるフラックス、そのフラックスの製造方法および高純度鋼の製造方法 Download PDF

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WO2020195840A1
WO2020195840A1 PCT/JP2020/010559 JP2020010559W WO2020195840A1 WO 2020195840 A1 WO2020195840 A1 WO 2020195840A1 JP 2020010559 W JP2020010559 W JP 2020010559W WO 2020195840 A1 WO2020195840 A1 WO 2020195840A1
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Prior art keywords
flux
mass
less
cao
caf
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English (en)
French (fr)
Japanese (ja)
Inventor
慧 平田
厚徳 小山
田中　孝明
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Denka Co Ltd
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Denka Co Ltd
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Priority to EP20779441.3A priority Critical patent/EP3950172A4/en
Priority to JP2021509006A priority patent/JPWO2020195840A1/ja
Publication of WO2020195840A1 publication Critical patent/WO2020195840A1/ja
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/116—Refining the metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings or fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings or fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3602—Carbonates, basic oxides or hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings or fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings or fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3603—Halide salts
    • B23K35/3605—Fluorides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings or fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings or fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/361—Alumina or aluminates
    • 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
    • C21C7/064—Dephosphorising; Desulfurising
    • C21C7/0645—Agents used for dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
    • C22B9/103—Methods of introduction of solid or liquid refining or fluxing agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/18—Electroslag remelting

Definitions

  • the present invention relates to a flux used in the electroslag remelting method, a method for producing the flux, and a method for producing high-purity steel.
  • the electroslag remelting method is a kind of special melting method for producing high-purity metal by remelting and refining a metal material (for example, steel material).
  • This method is also called “ESR method” or “ESR process” by taking the acronym of "Electro-Slug Reelting process” in English (hereinafter, these notations are also used in the present specification).
  • the electrode metal is melted by the heat resistance of the slag, and (2) impurities (sulfur, oxygen, etc.) are removed when the molten metal droplets pass through the slag pool. , (3) Then, the molten metal solidifies at the bottom of the furnace to form slag, and the metal material is highly purified.
  • the slag a slag containing CaF 2 or Al 2 O 3 as a main component is often used. That is, it is often the case that a solid flux containing CaF 2 or Al 2 O 3 as a main component is melted at a high temperature to form slag.
  • Patent Document 1 describes SiO 2 : 0.2 to 15% by weight, Al 2 O 3 : 12 to 40% by weight, alkaline earth metal oxide: 15 to 40% by weight, CaF 2 : 12 to 75% by weight. Slags for the electroslag remelting method are described having analytical compositions of% by weight, FeO: 0.5% by weight or less, MnO: 1% by weight or less, and TiO 2 : 10% by weight or less.
  • the left column on page 2 of this document states that the water content in the slag should be reduced in order for the water derived from the flux to cause hydrogen embrittlement of the metal material to be dissolved and refined.
  • the composition of the flux to be added in the ESR method is CaO: 20 to 60 mass%, Al 2 O 3 : 10 to 40 mass%, CaF 2 : 20 to 60 mass%, iron oxide: It is described that 1 to 10 mass% and CaO / Al 2 O 3 : 1.0 to 6.0.
  • the present invention has been made in view of such circumstances.
  • One of the objects of the present invention is to provide a flux used in an electroslag remelting method capable of producing a high-purity metal in which hydrogen embrittlement is suppressed with a high yield.
  • a flux used in the electroslag redissolution method When the water content of the flux obtained by the Karl Fisher method is W, and the change in water content when the flux is left in an environment of 30 ° C. and 85% RH for 14 days is ⁇ W, W is 0.03% by mass or less. A flux having a ⁇ W of 0.01% by mass or less is provided.
  • a method for producing high-purity steel which comprises a step of refining the raw material steel into high-purity steel by remelting by the electroslag remelting method.
  • a method for producing high-purity steel using the melt of the above-mentioned flux as the molten slag is provided.
  • the above flux manufacturing method At least, a method for producing a flux is provided, which comprises a melt-mixing step of melt-mixing a compound containing CaF 2 and a compound containing Al 2 O 3 at 1600 ° C. or higher.
  • a flux used in an electroslag redissolving method capable of producing a high-purity metal in which hydrogen embrittlement is suppressed with a high yield.
  • the term "slag” basically refers to a state in which a flux that is solid at room temperature (23 ° C.) is heated and melted at a high temperature.
  • a flux that is solid at room temperature seems to be expressed as "slag").
  • the flux of the present embodiment is used in the electroslag redissolving method.
  • the water content of this flux determined by the Karl Fisher method is W, and the change in water content (water content after 14 days-initial water content) when this flux is placed in an environment of 30 ° C. and 85% RH for 14 days is ⁇ W.
  • W is 0.03% by mass or less, preferably 0.02% by mass or less.
  • ⁇ W is 0.01% by mass or less, preferably 0.005% by mass or less, and more preferably 0.003% by mass or less.
  • the lower limit of W is ideally 0, but in reality, it is, for example, 0.00001 mass% or more.
  • the lower limit of ⁇ W is, for example, ⁇ 0.005% or more.
  • the present inventors paid particular attention to the water content of the flux in order to improve the yield of the ingot obtained by the ESR method. Specifically, the present inventors have decided to measure the water content by the curl fisher method in order to accurately control and optimize the water content of the flux, and the water content W obtained by the measurement is 0.03 mass.
  • the flux was designed to be less than or equal to%.
  • the present inventors considered that not only the water content of the flux but also the change over time is closely related to the yield from the viewpoint of improving the yield of the ingot. Based on this idea, the present inventors designed the flux so that the water content change ⁇ W when left in an environment of 30 ° C. and 85% RH for 14 days was 0.01% by mass or less.
  • W for example, when producing a flux, it is preferable to heat the raw material to a sufficiently high temperature using an electric furnace or the like to remove water. Further, in order to make ⁇ W the above value, for example, (1) reduce the amount of the CaO component contained in the flux, and (2) even if the flux contains a certain amount of the CaO component, the flux may contain other substances. It is preferable that CaO alone does not exist by reacting with the components of (3) and / or (3) the particle size (particle size) of the flux is appropriately controlled. These matters will be described in detail later.
  • the water content can be measured by the curl fisher method with high accuracy using, for example, an apparatus (Mitsubishi Chemical Analytech Co., Ltd./CA-100 type).
  • Patent Document 1 describes a method for measuring the water content by heating granular slag to 650 ° C. and allowing magnesium perchlorate to absorb the released water.
  • this method cannot absorb all the water due to magnesium perchlorate, or substances other than water may be absorbed by magnesium perchlorate, so the water content is quantified compared to the Carl Fisher method. It is considered that the accuracy of the water content is low and it is not possible to measure the water content appropriately.
  • the absolute humidity of the indoor air fluctuates greatly between "4 to 17 g / m 3 " in a "paper bag having a polyethylene lining", that is, a bag having a moisture blocking property.
  • the amount of moisture absorbed by the flux stored in the environment is measured.
  • the hygroscopicity of the "flux itself” is not properly evaluated.
  • the hygroscopicity of the flux itself in a bare state that cannot be put in a bag is evaluated under certain conditions of 30 ° C. and 85% RH environment so that the hygroscopicity of the flux itself can be appropriately measured.
  • ⁇ W obtained by the measurement is in a certain numerical range.
  • the flux of the present embodiment preferably contains CaF 2 and Al 2 O 3 . More preferably, the part or all CaF 2 as CaF 2 crystalline phase, some or all of the for Al 2 O 3 Al 2 O 3 crystal phase, present in the flux of the present embodiment. Since the flux contains CaF 2 and Al 2 O 3 , there is an advantage that an appropriate melting temperature of the flux can be obtained.
  • the content of the CaF 2 crystal phase in the entire crystal phase in the flux is preferably 60% by mass or more and 80% by mass or less, more preferably 65% by mass or more and 75% by mass or less. Is.
  • the content of the Al 2 O 3 crystal phase in the entire crystal phase in the flux is preferably 5% by mass or more and 15% by mass or less, more preferably 7% by mass or more. It is 13% by mass or less.
  • the flux of the present embodiment preferably does not contain the CaO component as a chemical component (0% by mass), or even if it contains the CaO component, the amount thereof is 7% by mass or less in the entire flux.
  • the amount of the CaO component in the entire flux is more preferably 5% by mass or less, still more preferably 4% by mass or less.
  • the CaO component here includes both CaO in the CaO ⁇ 6Al 2 O 3 crystal phase described later and CaO other than that. CaO is a highly hygroscopic substance. Therefore, by reducing the amount of the CaO component in the flux, it is easy to set ⁇ W to a desired value.
  • the flux of the present embodiment is a flux. It is preferable to contain 0.1% by mass or more of CaO component in the whole.
  • the flux of the present embodiment preferably contains CaO ⁇ 6Al 2 O 3 .
  • CaO ⁇ 6Al 2 O 3 is preferably present in the flux in the form of a crystalline phase.
  • CaO ⁇ 6Al 2 O 3 is considered to have a structure in which the CaO component is surrounded by 6Al 2 O 3 . Therefore, it is considered that moisture absorption can be suppressed as compared with the case where CaO is present alone. Therefore, when the flux contains CaO ⁇ 6Al 2 O 3 , it is easy to set ⁇ W to a desired value.
  • the melting point of the flux can be further lowered by containing CaO ⁇ 6Al 2 O 3 in the flux of the present embodiment. Lowering the melting point of the flux leads to a reduction in energy and thus in cost.
  • the melting point of Al 2 O 3 is 2072 ° C (literature value), which is very high, while the melting point of CaO ⁇ 6Al 2 O 3 is about 1850 ° C. (literature value), which is lower than the melting point of Al 2 O 3 .
  • CaO ⁇ 6Al 2 O 3 contains 6 mol of Al 2 O 3 with respect to 1 mol of CaO.
  • the flux of the present embodiment has a low melting point as a whole by containing an appropriate amount of CaO ⁇ 6Al 2 O 3, which is considered to have properties close to Al 2 O 3 , but has a melting point lower than that of Al 2 O 3. It is presumed that it will become.
  • the flux of the present embodiment comprises a CaO ⁇ 6Al 2 O 3, the content of CaO ⁇ 6Al 2 O 3 crystalline phase in the entire crystal phase in the flux, at least 10 wt% 30 wt% or less, preferably 12 wt% It is 25% by mass or less, more preferably 14% by mass or more and 20% by mass or less.
  • the flux of the present embodiment preferably contains, for example, one or more of the MgO component, the SiO 2 component, and the like as components other than the above. It is considered that when the flux contains an appropriate amount of MgO component, the basicity of the slag obtained by melting the flux can be appropriately increased while keeping the melting point of the flux low. This is preferable in terms of the ability to remove sulfur components during ingot production. When the flux contains an appropriate amount of the SiO 2 component, it becomes easy to design to increase the electric resistance of the slag obtained by melting the flux while maintaining the performance such as the removability of the sulfur component. This is preferable in that the electrode metal can be easily dissolved. Further, when the flux contains an appropriate amount of the SiO 2 component, the ferrite phase of the steel tends to be strengthened and the strength of the steel after refining tends to increase.
  • the content thereof is preferably 0.005% by mass or more and 0.5% by mass or less, and more preferably 0.01% by mass or more and 0.03% by mass in the entire flux. % Or less.
  • the flux of the present embodiment further contains a SiO 2 component, the content thereof in the entire flux is preferably 0.3% by mass or more and 1.5% by mass or less, and more preferably 0.5% by mass or more and 1.0. It is mass% or less.
  • each crystal phase of CaF 2 , Al 2 O 3 , and Ca O ⁇ 6 Al 2 O 3 is analyzed by, for example, a powder X-ray diffraction (XRD) pattern by the Rietveld method. Quantitative analysis can be performed. More specifically, by comparing the diffraction intensity-incident angle chart obtained by XRD analysis with the XRD pattern simulated from the crystal structure model, and using the least squares method so that the residuals of the experimental and calculated XRD patterns are minimized. Each content can be determined through a method of optimizing the mass fraction.
  • XRD powder X-ray diffraction
  • the amount of chemical components such as CaO component, MgO component, and SiO 2 component can be quantified by a fluorescent X-ray elemental analysis method (X-ray Fluorescence Analysis, XRF), an ion electrode method, a combination of these methods, and the like.
  • XRF X-ray Fluorescence Analysis
  • the flux of the present embodiment preferably contains as little components as possible other than the above. That is, it is preferable that the amount of impurities contained in the flux of the present embodiment is as small as possible. Since the amount of components other than the above is small, fluctuations in the characteristics of the slag obtained by dissolving the flux can be suppressed.
  • the content of impurities is preferably 5% by mass or less, more preferably 3% by mass or less, and further preferably 1% by mass or less in the entire flux.
  • the properties of the flux of this embodiment can vary. From the viewpoint of controlling ⁇ W to a desired value (and thereby producing a high-purity metal in which hydrogen embrittlement is suppressed with good yield), it is preferable that the metal is granular at room temperature.
  • the normal temperature is, for example, 23 ° C.
  • the flux of the present embodiment can be produced by mixing the particles of each of the above-mentioned components. For example, (1) first, the raw materials of CaF 2 , Al 2 O 3 , and CaO ⁇ 6 Al 2 O 3 are prepared, and (2) each raw material is separately melted, cooled, and pulverized, and sieved as necessary. (3) It can be obtained by blending the obtained pulverized product in an appropriate ratio.
  • the flux of the present embodiment may contain at least a melt mixture of a compound containing a CaF 2 crystal phase and a compound containing an Al 2 O 3 crystal phase.
  • the flux of the present embodiment rather than as described above CaF 2 and Al 2 O 3 is present as a "separate particles", melted and CaF 2 and Al 2 O 3 together It is preferable that a molten mixture of CaF 2 and Al 2 O 3 is contained as a mixture.
  • the flux containing at least a melt mixture of a compound containing CaF 2 and a compound containing Al 2 O 3 is (1) a compound containing CaF 2 as a raw material and a compound containing Al 2 O 3 (in some cases, further trace components). ) Are mixed together while being melted to form a melt, and (2) the melt can be produced by cooling, pulverizing, and sieving if necessary.
  • the temperature at the time of melting and mixing of (1) is preferably 1600 ° C. or higher.
  • the pulverization and sieving of (2) it is preferable that the final particle size is as described later.
  • the particle size of the flux of the present embodiment By appropriately adjusting the particle size of the flux of the present embodiment, it is easier to set ⁇ W to a more desired value.
  • the specific surface area can be reduced by appropriately increasing the particle size of the flux. This leads to a decrease in hygroscopicity.
  • the passing rate of the flux (grains) is determined.
  • the flux (grains) of preferably 55% by mass or less, more preferably 45% by mass or less (that is, preferably 45% by mass or more, more preferably 55% by mass or more) based on the entire flux is the mesh of the sieve.
  • the particle size of the flux of the present embodiment is preferably appropriately small.
  • FIG. 1 and 2 are schematic views for explaining an example of a method of refining raw material steel by the ESR method to produce high-purity steel.
  • FIG. 1 is a diagram schematically showing a state at the start of production of high-purity steel by the ESR method
  • FIG. 2 is a state after a while has passed from the start of FIG. Is a diagram schematically showing.
  • the raw material steel (electrode 10) is electrically connected to one end of the power supply 2.
  • the composition of the raw material steel (electrode 10) is not particularly limited. The composition can be determined to correspond to the high-purity steel to be obtained.
  • the raw material steel (electrode 10) is installed in the ESR furnace 1 so as to be movable up and down. At the start of production, a solid (granular at room temperature) flux 11A is spread on the lateral portion and the lower portion of the raw material steel (electrode 10).
  • the flux 11A has the above-mentioned composition.
  • the other end of the power supply 2 is electrically connected to the conductive hearth of the ESR furnace 1.
  • a cooling means such as a water cooling means may be provided on the furnace wall of the ESR furnace 1 (not shown in FIG. 1). Although the ESR furnace 1 is shown in an open form in FIG. 1, the smelting of the raw material steel may be performed in a closed ESR furnace in which the atmosphere is adjusted.
  • Example 1 Flux production> First, the following CaF 2 and Al 2 O 3 were prepared. The "particle size" was measured using a sieve for JIS test. -CaF 2 : compounding ratio 70% by mass, purity 98% by mass or more, particle size 3 mm or less-Al 2 O 3 : compounding ratio 30% by mass, purity 99% by mass or more, particle size: 1 mm or less
  • CaF 2 is a small amount of MgO , SiO 2 and the like were included.
  • the above raw materials were mixed with a gravity mixer to obtain a substantially uniform mixture. Then, the mixture was put into a three-phase arc furnace and heated to 1600 ° C. or higher under the conditions of a current value of 3.0 to 3.5 kA and a voltage value of 150 to 200 V to melt the mixture to obtain a molten mixture. The melting time at this time was 3 hours.
  • the obtained molten mixture was pulverized with a hammer mill and appropriately sieved to obtain a granular flux.
  • the degree of pulverization is shown in Table 1 below as "mass ratio by particle size" (particle size was measured using a sieve for JIS test).
  • the obtained flux was XRD-analyzed using an apparatus "D8 ADVANCE" manufactured by BRUKER, and then analyzed using the analysis software "TOPAS" of the same company.
  • TOPAS analysis software
  • the content of each crystal phase of CaF 2 , Al 2 O 3 , CaO ⁇ 6 Al 2 O 3 and CaO in the entire crystal phase in the flux was determined.
  • literature values were used as reference values for 2 ⁇ of each crystal phase.
  • an XRD chart of the flux of Example 1 is shown in FIG.
  • the content of the CaO component in the flux, the content of the MgO component in the flux, and the content of the SiO 2 component in the flux were determined by fluorescent X-ray analysis (XRF). Specifically, first, peaks of Ca, Mg and Si were obtained using a scanning fluorescent X-ray analyzer (ZSX Primus II) manufactured by Rigaku Corporation as an analyzer. Next, for Mg and Si, the intensities of the obtained peaks were applied to a calibration curve prepared in advance by chemical analysis to determine the amounts of MgO and SiO 2 . At this time, it was assumed that all of Mg and Si detected by XRF existed in the form of MgO and SiO 2 , respectively.
  • XRF fluorescent X-ray analysis
  • Ca all Ca is detected as CaO bonded to oxygen atoms by the fluorescent X-ray analysis method, and Ca in CaF 2 is also regarded as CaO. Therefore, measurement by the ion electrode method is also performed.
  • the content of CaO component was determined. Specifically, first, HF was generated from CaF 2 in water vapor and flux, and the HF was taken into water to obtain an HF aqueous solution. The amount of fluorine in this aqueous solution was measured by the ion electrode method, and the measured value was converted into the CaF 2 content in the flux. Then, the content of the CaF 2 component in the flux obtained above was cut from the CaO component content detected by the fluorescent X-ray analysis method to obtain the content of the CaO component in the flux.
  • Examples 2 and 3 The flux was produced by the same raw materials and production method as in Example 1. In addition, various analyzes were performed.
  • Example 4 First, the raw material compound containing CaF 2 and the compound containing Al 2 O 3 were separately melted in an electric furnace at a temperature of 1600 ° C. or higher and coarsely crushed to a maximum particle size of 2.8 mm or less. (Each raw material is the same as that prepared in Example 1). Next, 70% by mass of the melt of the compound containing CaF 2 obtained above and 30% by mass of the melt of the compound containing Al 2 O 3 obtained above were mixed. From the above, a flux in which CaF 2 and Al 2 O 3 basically exist as separate particles was obtained.
  • the flux obtained above which has a particle size of 1 to 2.8 mm, a flux having a particle size of 0.5 to 1 mm, and a flux having a particle size of 0.5 mm or less are separately used as an apparatus (Mitsubishi Chemical Analysis).
  • the water content was determined by the curl fisher method for Tech / CA-100).
  • Table 1 summarizes the composition of the flux, the manufacturing method (outline), and the mass ratio by particle size.
  • Table 2 summarizes the results of the above ⁇ measurement of initial moisture content and hygroscopicity>.
  • the value in the "Total" column of Table 2 is obtained by the sum of the water content of the flux of each particle size x the mass ratio of each particle size in the entire flux before sieving ( ⁇ ) of each Example / Comparative Example.
  • the moisture content (unit: mass%) of the flux "as a whole”.
  • the value of 0 days (immediately after production) of the elapsed days is the water content W
  • the value of 14 days of elapsed days-the value of 0 days of elapsed days is the moisture content change ⁇ W (see Table 2 for ⁇ W). Also shown).

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PCT/JP2020/010559 2019-03-26 2020-03-11 エレクトロスラグ再溶解法に用いられるフラックス、そのフラックスの製造方法および高純度鋼の製造方法 Ceased WO2020195840A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20779441.3A EP3950172A4 (en) 2019-03-26 2020-03-11 FLUX USED IN AN ELECTROSLAB REMELTING PROCESS, PROCESS FOR PRODUCING SUCH FLUX, AND PROCESS FOR PRODUCING HIGH-PURITY STEEL
JP2021509006A JPWO2020195840A1 (https=) 2019-03-26 2020-03-11

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JPWO2023084898A1 (https=) * 2021-11-09 2023-05-19
WO2023084897A1 (ja) * 2021-11-09 2023-05-19 デンカ株式会社 エレクトロスラグ再溶解法に用いられるフラックス、そのフラックスの製造方法および高純度鋼の製造方法

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CN114635071A (zh) * 2020-12-16 2022-06-17 宝武特种冶金有限公司 一种马氏体耐热钢的冶炼方法
JPWO2023084898A1 (https=) * 2021-11-09 2023-05-19
WO2023084898A1 (ja) * 2021-11-09 2023-05-19 デンカ株式会社 エレクトロスラグ再溶解法に用いられるフラックス、そのフラックスの製造方法および高純度鋼の製造方法
WO2023084897A1 (ja) * 2021-11-09 2023-05-19 デンカ株式会社 エレクトロスラグ再溶解法に用いられるフラックス、そのフラックスの製造方法および高純度鋼の製造方法
JPWO2023084897A1 (https=) * 2021-11-09 2023-05-19
EP4424856A4 (en) * 2021-11-09 2025-07-02 Denka Company Ltd FLUX USED IN ELECTROCONDUCTIVE SLAG REMELT, PROCESS FOR PRODUCING THIS FLUX, AND PROCESS FOR PRODUCING HIGH-PURE STEEL
EP4424855A4 (en) * 2021-11-09 2025-07-02 Denka Company Ltd FLUX USED IN ELECTROCONDUCTIVE SLAG REMELT, PROCESS FOR PRODUCING THIS FLUX, AND PROCESS FOR PRODUCING HIGH-PURE STEEL
JP7734203B2 (ja) 2021-11-09 2025-09-04 デンカ株式会社 エレクトロスラグ再溶解法に用いられるフラックス、そのフラックスの製造方法および高純度鋼の製造方法
JP7734204B2 (ja) 2021-11-09 2025-09-04 デンカ株式会社 エレクトロスラグ再溶解法に用いられるフラックス、そのフラックスの製造方法および高純度鋼の製造方法

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