WO2020195838A1 - エレクトロスラグ再溶解法に用いられるフラックス、そのフラックスの溶融物を用いる高純度鋼の製造方法、および、そのフラックスの製造方法 - 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、そのフラックスの溶融物を用いる高純度鋼の製造方法、および、そのフラックスの製造方法 Download PDF

Info

Publication number
WO2020195838A1
WO2020195838A1 PCT/JP2020/010554 JP2020010554W WO2020195838A1 WO 2020195838 A1 WO2020195838 A1 WO 2020195838A1 JP 2020010554 W JP2020010554 W JP 2020010554W WO 2020195838 A1 WO2020195838 A1 WO 2020195838A1
Authority
WO
WIPO (PCT)
Prior art keywords
flux
mass
crystal phase
cao
caf
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2020/010554
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
慧 平田
厚徳 小山
田中　孝明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denka Co Ltd
Original Assignee
Denka Co Ltd
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 Denka Co Ltd filed Critical Denka Co Ltd
Priority to EP20779826.5A priority Critical patent/EP3950173B1/en
Priority to JP2021509005A priority patent/JPWO2020195838A1/ja
Publication of WO2020195838A1 publication Critical patent/WO2020195838A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • B23K35/3603—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
    • 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 high-purity steel using a melt of the flux, and a method for producing the flux.
  • the electroslag remelting method is a type of special melting method in which a metal material (for example, steel) is melted and smelted again to produce a high-purity metal.
  • This method is also referred to as the "ESR method", which is an acronym for the English notation Elector-Slag Remelting process (hereinafter, this notation is also used hereinafter).
  • 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) And the molten metal solidifies at the bottom of the furnace, so that the metal material is highly purified.
  • 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. It also describes how to make it.
  • the composition of the flux to be added in the electroslag remelting method is CaO: 20 to 60 mass%, Al 2 O 3 : 10 to 40 mass%, CaF 2 : 20 to 60 mass%, and so on. It is described that iron oxide: 1 to 10 mass% and CaO / Al 2 O 3 : 1.0 to 6.0.
  • the flux used melts at a relatively low melting point to form molten slag. Since the flux has a low melting point, there are merits such as reduction of energy cost and reduction of undissolved flux.
  • the present inventors considered that there is still room for improvement in lowering the melting point of the flux, more specifically, the flux containing CaF 2 and Al 2 O 3 as main components. That is, the present inventors have conducted various studies for the purpose of providing an ESR flux having a low melting point and being easy to melt.
  • a flux used in the electroslag redissolution method contains a CaF 2 crystal phase, an Al 2 O 3 crystal phase, and a CaO ⁇ 6 Al 2 O 3 crystal phase.
  • a flux in which the content of the CaO ⁇ 6Al 2 O 3 crystal phase in the entire crystal phase in the flux is 10% by mass or more and 30% 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 is provided in which the above-mentioned flux is melted as the slag.
  • the above flux manufacturing method A method for producing a flux 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 for ESR having a low melting point and being easy to melt.
  • 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 flux of the present embodiment includes a CaF 2 crystal phase, an Al 2 O 3 crystal phase, and a CaO ⁇ 6 Al 2 O 3 crystal phase.
  • the content of the CaO ⁇ 6Al 2 O 3 crystal phase in the entire crystal phase in the flux is 10% by mass or more and 30% by mass or less.
  • the melting point of Al 2 O 3 among Ca F 2 and Al 2 O 3 which are the main crystal phases of the premelt flux for the ESR method is 2072 ° C (literature value), which is very high. high.
  • 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. From this, it is presumed that CaO ⁇ 6Al 2 O 3 has physical / chemical properties close to those of Al 2 O 3 .
  • the flux of the present embodiment is used in the ESR method 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 Al 2 O 3 ". It is presumed that the melting point of the flux as a whole is lowered while having the necessary properties as a flux.
  • the content of each crystal phase of CaF 2 , Al 2 O 3 , and CaO ⁇ 6 Al 2 O 3 can be quantitatively analyzed by, for example, analyzing a powder X-ray diffraction (XRD) pattern by the Rietveld method. 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 content of the CaO ⁇ 6Al 2 O 3 crystal phase in the entire crystal phase in the flux of the present embodiment may be 10% by mass or more and 30% by mass or less in the entire flux. This content is preferably 12% by mass or more and 25% by mass or less, and more preferably 14% by mass or more and 20% by mass or less.
  • the content of the CaF 2 crystal phase in the flux of the present embodiment is preferably 60% by mass or more and 80% by mass or less, and more preferably 65% by mass or more and 75% by mass or less in the entire crystal phase in the flux.
  • the content of the Al 2 O 3 crystal phase in the flux of the present embodiment is preferably 5% by mass or more and 15% by mass or less, and more preferably 7% by mass or more and 13% by mass or less in the entire crystal phase in the flux. ..
  • the flux of the present embodiment preferably further contains a component other than CaF 2 and Al 2 O 3 as a chemical component.
  • the flux of the present embodiment preferably contains one or more of CaO, MgO, SiO 2, and the like.
  • the content of the CaO component in the flux of the present embodiment is preferably 0.1% by mass or more and 7% by mass or less, and more preferably 0.1% by mass or more and 5% by mass or less in the entire flux.
  • the CaO component here includes both CaO in the above-mentioned CaO ⁇ 6Al 2 O 3 crystal phase and other CaO. It is considered that when the flux contains an appropriate amount of CaO 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.
  • 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. It is as follows. When the flux contains an appropriate amount of MgO, the same effect as that of the CaO component tends to be obtained.
  • the content of the 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% by mass in the entire flux. % Or less.
  • the flux contains an appropriate amount of SiO 2 , 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.
  • the flux contains an appropriate amount of SiO 2 , the ferrite phase of the steel tends to be strengthened and the strength of the smelted steel tends to increase.
  • the amount of each of the above components 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
  • ion electrode method a combination of these methods, and the like.
  • 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 ease of handling, the flux of the present embodiment is usually granular at room temperature (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 the main minerals 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 crushed to be necessary. It can be obtained by sieving according to the above (3) and 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 CaF 2 and a compound containing Al 2 O 3 .
  • 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 compound containing CaF 2 can be a compound containing a CaF 2 crystal phase.
  • the compound containing Al 2 O 3 can be a compound containing an Al 2 O 3 crystal phase.
  • 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 the above-mentioned melt mixing is preferably 1600 ° C. or higher.
  • 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 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.
  • a flux "ESR-2029ELH” manufactured by Wacker was prepared. This flux is a mixture of particles of fused fluorite (CaF 2 ) and particles of fused alumina (Al 2 O 3 ), and substantially does not contain CaO ⁇ 6Al 2 O 3 .
  • Table 1 shows the composition (analysis result) of the flux of Examples 1 to 3 and Comparative Example 1 and the evaluation result of the melting point.
  • Table 1 shows the ratio of each crystal phase in the entire crystal phase and the ratio of each chemical component in the entire flux (crystal phase + amorphous portion). As a reminder, the total ratio is not always exactly 100 mass% because each ratio is calculated based on the calibration curve.
  • the fluxes of Examples 1 to 3 that is, the CaF 2 crystal phase, the Al 2 O 3 crystal phase, and the CaO ⁇ 6 Al 2 O 3 crystal phase are contained, and the CaO ⁇ 6 Al 2 O 3 crystal
  • the melting point of the flux having a phase ratio of 10% by mass or more and 30% by mass or less was lower than the melting point of the flux of Comparative Example 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
PCT/JP2020/010554 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、そのフラックスの溶融物を用いる高純度鋼の製造方法、および、そのフラックスの製造方法 Ceased WO2020195838A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20779826.5A EP3950173B1 (en) 2019-03-26 2020-03-11 Flux configured to be used in electroslag remelting method, and flux production method
JP2021509005A JPWO2020195838A1 (https=) 2019-03-26 2020-03-11

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-058332 2019-03-26
JP2019058332 2019-03-26

Publications (1)

Publication Number Publication Date
WO2020195838A1 true WO2020195838A1 (ja) 2020-10-01

Family

ID=72610569

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/010554 Ceased WO2020195838A1 (ja) 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、そのフラックスの溶融物を用いる高純度鋼の製造方法、および、そのフラックスの製造方法

Country Status (3)

Country Link
EP (1) EP3950173B1 (https=)
JP (1) JPWO2020195838A1 (https=)
WO (1) WO2020195838A1 (https=)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5760411B2 (https=) 1980-09-26 1982-12-20 Wacker Chemie Gmbh
JP2012241230A (ja) * 2011-05-19 2012-12-10 Hitachi Metals Ltd インゴットの製造方法
JP2013049908A (ja) 2011-08-31 2013-03-14 Jfe Steel Corp エレクトロスラグ再溶解法による高純度鋼の溶製方法
CN106756078A (zh) * 2016-11-17 2017-05-31 河南工程学院 一种耐热奥氏体不锈钢的电渣重熔渣系及其制备方法
JP2019058332A (ja) 2017-09-26 2019-04-18 テルモ株式会社 バルーンカテーテル

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4450007A (en) * 1982-12-13 1984-05-22 Cabot Corporation Process for electroslag remelting of manganese-base alloys
CN107312937B (zh) * 2017-06-26 2019-12-06 洛阳双瑞特种装备有限公司 一种耐高温浓硫酸用高硅不锈钢制造方法及其设备
CN107488788B (zh) * 2017-07-31 2019-02-26 辽宁科技大学 一种用于生产17-4ph钢锭的专用渣系及其制备和使用方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5760411B2 (https=) 1980-09-26 1982-12-20 Wacker Chemie Gmbh
JP2012241230A (ja) * 2011-05-19 2012-12-10 Hitachi Metals Ltd インゴットの製造方法
JP2013049908A (ja) 2011-08-31 2013-03-14 Jfe Steel Corp エレクトロスラグ再溶解法による高純度鋼の溶製方法
CN106756078A (zh) * 2016-11-17 2017-05-31 河南工程学院 一种耐热奥氏体不锈钢的电渣重熔渣系及其制备方法
JP2019058332A (ja) 2017-09-26 2019-04-18 テルモ株式会社 バルーンカテーテル

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DONG, YANWU ET AL.: "Dissolution Behavior of Alumina-Based Inclusions in CaF2-A1203-Ca0-Mg0=Si02 Slag Used for the Electroslag Metallurgy Process", METALS, vol. 6, no. 11, 9 November 2016 (2016-11-09), pages 273, XP55742944 *
See also references of EP3950173A4

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Also Published As

Publication number Publication date
EP3950173B1 (en) 2023-04-05
JPWO2020195838A1 (https=) 2020-10-01
EP3950173A1 (en) 2022-02-09
EP3950173A4 (en) 2022-02-09

Similar Documents

Publication Publication Date Title
Kaußen et al. Reductive smelting of red mud for iron recovery
CN108474061A (zh) 富含锂的冶金矿渣
JP6230531B2 (ja) 金属クロムの製造方法
WO2020195840A1 (ja) 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
WO2020195838A1 (ja) エレクトロスラグ再溶解法に用いられるフラックス、そのフラックスの溶融物を用いる高純度鋼の製造方法、および、そのフラックスの製造方法
CN106834891A (zh) 一种钛铁合金的制备方法
Samal et al. Carboaluminothermic production of ferrotitanium from ilmenite through thermal plasma
Park et al. Novel design of ferronickel smelting slag by utilizing red mud as a fluxing agent: Thermochemical computations and experimental confirmation
Xakalashe et al. Combined carbothermic reduction of bauxite residue and basic oxygen furnace slag for enhanced recovery of Fe and slag conditioning
CN103602825A (zh) 一种用于贵金属火法冶炼中的助熔剂
RU2487173C1 (ru) Флюс для электрошлакового переплава
AU2010290830A1 (en) Processing of metallurgical slag
CN106834880A (zh) 一种钛铁合金的制备方法
Mehrabi et al. The effect of slag types and melting rate on electro-slag remelting (ESR) processing
Xakalashe et al. Towards red mud valorization: EAF smelting process for iron recovery and slag design for use as precursor in the construction industry
Botha et al. Effect of silica concentration on degree of sintering of chromite-silica ladle well filler sand based on South African raw materials
JP7734204B2 (ja) 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
JP7734203B2 (ja) 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
CN101230423A (zh) 一种高钛钛铁的制造方法
JP4599612B2 (ja) 廃レンガからの貴金属の回収方法
Wei et al. Phase-diagram-guided sequential fluxing for overcoming self-fluxing slag evolution constraints: Slag reconstruction for tin-bearing waste
CN112400028A (zh) 钙、铝及硅合金以及其生产方法
Jayakumari et al. Carbon materials for silicomanganese reduction
CA2975961A1 (en) Method for increasing of titanium oxide content in slag produced in connection with electric furnace smelting of titanomagnetite
Tangstad et al. Reduction of agglomerated manganese ores in a 150 kW pilot scale furnace

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20779826

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021509005

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2020779826

Country of ref document: EP

Effective date: 20211026