JP4736105B1 - Liquid flux - Google Patents

Abstract

[PROBLEMS] To cut the steel material by (1) suppressing the oxidation of the cut surface and forming a good quality oxide mainly composed of wustite (FeO) on the cut surface so that the cut dross does not re-weld to the cut surface. (3) Prevent vaporized flux from precipitating in the transport pipe.
A fluoride and an organic halogen compound are mixed and dissolved in a solvent such as alcohol or acetone to generate a liquid flux, and a combustion gas is blown into a vaporizer to generate a vaporized flux.
[Selection] Figure 1

Description

The present invention is used for the prevention of adhesion of dross (burrs, noro, etc.) generated when gas slabs of ordinary steel or special steel, gas slabs produced by continuous casting, and scarfing the surface of the slab. In particular, the present invention relates to a liquid flux manufacturing method, a manufacturing apparatus, and a liquid flux as a base of a vaporization flux used for brazing, such as silver solder, brass solder, and phosphor copper solder. The liquid flux produced by this method is vaporized and mixed in a combustion gas such as propane (C3H6) or acetylene (C2H2) and guided to a cutting torch or brazing torch for use in cutting, welding or brazing. For welding and brazing, it is possible to apply the liquid flux to the welded part or brazed part in advance.

Gas cutting methods include slab cutting produced by continuous gas casting or slab manufacturing of heavy steel or special steel by burning and oxidizing a combustible gas such as propane (C3H6) or acetylene (C2H2) with oxygen. It is used for. The gas cutting method has advantages such as high cutting speed and efficiency, simple equipment, and low running cost. However, the biggest drawback of the gas cutting method is that the molten iron and oxidation reaction dross adhere to and grow on the lower surface of the material to be cut. The dross that becomes such deposits is generally called burr or noro, and the dross removal work after cutting is heavy labor. The dross removal work in the conventional gas cutting work often relies on human naval tactics, and the actual situation is that a human rides on steel with residual heat after cutting and the cutting part is maintained with a hand grinder. Yes, it's hot, dirty and hard 3K work. In steel cutting manufacturers, processes such as material picking, unfolding, and cutting are computerized by NC conversion of cutting machines, etc., and even unskilled workers can respond with short-term education and training. However, with regard to prevention of dross adhesion, change the combustion gas and oxygen pressure, flow rate, cutting speed, and cutting preheating temperature according to the conditions such as steel grade, plate thickness, and temperature, and identify cutting conditions that prevent dross from adhering. It has not yet been automated. Furthermore, automation of dross removal work has been delayed, and robotization is difficult due to differences in steel types and cutting shapes. For this reason, conventionally, various cutting methods have been proposed in which dross does not adhere in the cutting work of thick plates. In addition, since the slab manufactured by continuous casting has surface defects, the area of the defects is removed by scarfing with combustion gas and oxygen, but the dross may reattach after the removal, and the slab is rolled into a thin plate. It was a cause of surface flaws.

The inventor of the present invention has invented a liquid flux and a vaporized flux obtained by vaporizing a liquid flux with a vaporizer in order to prevent dross adhesion in gas cutting and improve weldability and brazing. In Japanese Unexamined Patent Application Publication No. 2009-090368, “Gas Cutting Vaporization Flux” (Patent Document 1), a mixed flux prepared by appropriately mixing fluxes used for brazing or the like in a solvent such as alcohol or acetone is used for 8-25. A gas cutting vaporization flux was invented that was mixed by weight%, dissolved in a supercritical apparatus at a temperature of 300 to 400 ° C. and a pressure of 34.3 to 44.1 MPa to form a liquid flux, and gas was blown into the liquid flux for vaporization. . JP 2009-297782 A "Liquid flux production method and apparatus" (Patent Document 2), alkali metal, alkaline earth metal, halogen, B, C, N, O, Si, P, S, Zn, etc. Production of a liquid flux that dissolves an electrolyte formed by combining at least two types of atoms in a container with a magnetic field in a container containing a solvent such as alcohol or acetone and rotating the solvent Invented the method. In Japanese Patent Application Laid-Open No. 2010-100441 “Liquid Flux Manufacturing Method and Manufacturing Apparatus and Liquid Flux” (Patent Document 3), alkali metal, alkaline earth metal, halogen, B, C, N, O, Si, P, S Production of a liquid flux in which an electrolyte formed by combining at least two kinds of atoms such as Zn is dissolved in a container containing a solvent such as alcohol while applying a magnetic field and rotating the solvent. In the method, a liquid flux manufacturing method was invented in which an electrode was inserted into a solvent to apply a voltage and a pulse voltage. In Japanese Patent Application Laid-Open No. 2009-255105, “Vaporizer” (Patent Document 4) invented a vaporizer for vaporizing a liquid flux to generate a vaporized flux.

Applying liquid flux and vaporized flux produced using the above invention to cutting, welding, brazing, reducing dross when cutting steel, preventing re-welding to base metal, welding performance of metals or brazing The improvement was realized. Particularly in steel cutting, it is possible to prevent the oxidation of the cut surface, improve the fluidity of the cut dross by lowering the melting point of the cut dross, and reduce the dross adhesion to the lower surface of the cut by reducing the surface tension of the cut dross.

With regard to welding and brazing, the strength and shape of the joint surface could be improved with the liquid flux and vaporization flux according to the invention described above. However, cutting of steel using a large amount of oxygen generates a large amount of cutting dross, so prevention of adhesion of cutting dross is prevented. It was not enough. The cutting dross is oxidized by oxygen and becomes wustite (FeO), hematite (Fe2O3), and magnetite (Fe3O4) depending on the progress of oxidation. Wustite is a dross with good releasability, and it is desirable to control so that wustite is the main component in cutting steel, and the liquid flux functions so that the cutting dross is mainly wustite. However, when cutting steel materials, a large amount of oxygen is added to the combustion gas such as acetylene and propane, so the cut surface is in an excessively oxygen state. The cutting dross is made wustite with vaporized flux to prevent oxidation, improve fluidity, and surface tension. Even if it was reduced, it partially changed to hematite or magnetite, so there was a limit to reducing dross adhesion.

Further, when handling the vaporized flux, (1) even if the liquid flux is completely dissolved and made transparent, as the liquid flux vaporizes and becomes a vaporized flux, the dissolved component that slowly evaporates in the vaporizer. (2) While the vaporized flux is being transported as a gas fluid, it may precipitate in the transport pipe to form crystals.

JP 2009-090368 PR JP 2009-297778 A JP 2010-100441 PR JP 2009-255105 PR

Fundamentals and applications of high-temperature oxidation, by Uchida Otsukuru, Shigeji Taniguchi and Kazuya Kurokawa Chemistry of steel materials, Uchida Otsukuru, Mitsuru Yanano, Shigeru Suzuki

The problems to be solved by the present invention are as follows. (1) Oxidation of the cut surface is suppressed at the time of cutting the steel material, and a good quality oxide mainly composed of wustite (FeO) is formed on the cut surface, so that the cut dross does not re-weld to the cut surface. (2) The dissolved component of the liquid flux is not deposited in the vaporizer, and (3) The vaporized flux is not deposited in the transport pipe.

As shown in claim 1, the first solution is potassium (K), boron (B), sodium (Na), calcium (Ca), silicon (Si), aluminum (Al), nitrogen (N). One or two or more types of fluorides are selected from any of the fluorides, and the prepared fluoride prepared so that the fluorine (F) content contained in the selected fluoride is 30 to 70% by weight is alcohol. Alternatively, it is a liquid flux dissolved in a solvent such as acetone.

A second solution is a liquid flux obtained by dissolving the prepared fluoride and the organic halogen compound in a solvent such as alcohol or acetone, as shown in claim 2.

As the third solution means, as shown in claim 3, the compounded fluoride comprises potassium fluoride (KF), sodium fluoride (NaF), boron trifluoride (BF3), calcium fluoride (CaF2), Silicon tetrafluoride (SiF4), potassium borofluoride (KBF4), sodium borofluoride (NaBF4), ammonium borofluoride (NH4BF4), tetrafluoroboric acid (HBF4), potassium silicofluoride (K2SiF6), aluminum fluoride aluminum (liquid crystal) Stone) (Na3ALF6), potassium aluminum fluoride (potassium calcite) (K3ALF6), hexafluorosilicic acid (H2SiF6), sodium silicofluoride (Na2SiF4), acidic potassium fluoride (KHF2), sodium hydrogen fluoride (NaHF2) In acidic ammonium fluoride (NH4HF4) Select a liquid flux dissolved with methylamine hydrochloride salt of an organic halogen compound (CH3NH2HCl) or diethylamine hydrochloride ((C2H3) NH · HCl) in a solvent such as an alcohol or acetone.

The effects of the present invention are as follows: (1) By selecting and dissolving only the inorganic compound mainly composed of the reducing element, the formation of higher-order oxides such as magnetite and hematite in the cutting dross is suppressed, and the cutting dross is made mainly of wustite. (2) Combining compounds that can act as a flux even in a high-temperature cutting gas of 3500 to 4000 ° C., by forming a simple oxide and lowering the melting point, thereby improving cutting speed and preventing attachment of cutting dross. (3) Methylamine hydrochloride and diethylamine hydrochloride are easily dissolved in alcohols such as methanol and ethanol, which are liquid flux solvents, but their melting point and boiling point are higher than those of these solvents. Therefore, the dissolved component of the liquid flux is prevented from concentrating in the vaporizer and does not precipitate. It is in the can as.

Cutting image according to the present invention Image of cutting by conventional method

An embodiment of the present invention will be described with reference to FIGS.

As shown in claim 1, the first solution is potassium (K), boron (B), sodium (Na), calcium (Ca), aluminum (AL), silicon (Si), nitrogen (N). One or two or more types of fluorides are selected from any of the fluorides, and the prepared fluoride prepared so that the fluorine (F) content contained in the selected fluoride is 30 to 70% by weight is alcohol. Alternatively, it is a liquid flux dissolved in a solvent such as acetone.

Fluoride (fluoride, fluoride) is a compound composed of fluorine and other elements or atomic groups. Fluorine is an element having the greatest electronegativity, and has a characteristic that the oxidation number is (−1) among compounds, with a few exceptions such as HF3.

The content of fluorine in the prepared fluoride is 30 to 70% by weight because of the reducibility of fluorine and potassium (K), boron (B), sodium (Na), calcium (Ca), aluminum (AL), This is because the reducibility of silicon (Si) and nitrogen (N) is balanced. If the fluorine content is 30% or less, the reducibility of fluorine is insufficient, and recrystallization with K, B, Na, etc. is insufficient during cutting of steel. If the fluorine content exceeds 70%, the amount of fluorine is excessive and fluorine is generated alone, which is not preferable for the surrounding environment.

The liquid flux can be generated by the method invented by the inventors.

In Japanese Unexamined Patent Application Publication No. 2009-090368, “Gas Cutting Vaporization Flux” (Patent Document 1), a mixed flux prepared by appropriately mixing fluxes used for brazing or the like in a solvent such as alcohol or acetone is used for 8-25. According to the invention of vaporization flux for gas cutting, mixed by weight%, dissolved in a supercritical apparatus at a temperature of 300 to 400 ° C. and a pressure of 34.3 to 44.1 MPa to form a liquid flux, and gas is blown into the liquid flux for vaporization. Liquid flux and vaporization flux can be generated.

In JP 2009-297782 A "Liquid flux production method and apparatus" (Patent Document 2), alkali metal, alkaline earth metal, halogen, B, C, N, O, Si, AL, P, S, Liquid flux that dissolves an electrolyte formed by combining at least two kinds of atoms such as Zn in a container containing a solvent such as alcohol or acetone while rotating the solvent while applying a magnetic field. A liquid flux can be generated by this manufacturing method.

In JP2010-100441A "Liquid flux manufacturing method and manufacturing apparatus and liquid flux" (Patent Document 3), alkali metal, alkaline earth metal, halogen, B, C, AL, N, O, Si, P Liquid flux that dissolves an electrolyte formed by combining at least two kinds of atoms such as S, Zn, etc. while applying a magnetic field and rotating the solvent in a container containing a solvent such as alcohol In this manufacturing method, a liquid flux can be generated by a liquid flux manufacturing method in which an electrode is inserted into a solvent and a voltage is applied and a pulse voltage is applied.

In Japanese Laid-Open Patent Publication No. 2009-255105, “Vaporizer” (Patent Document 4), a vaporized flux can be generated by a vaporizer for vaporizing a liquid flux and generating a vaporized flux.

As shown in FIG. 2, in the case of a reducing flame reaction between combustion gas such as propane and acetylene and oxygen, Fe oxides formed at a high temperature of 840 K or higher are wustite (FeO), magnetite (Fe3O4), and hematite (Fe2O3). When Fe is oxidized, these oxides are formed in layers. When the growth of the oxide film is constrained by the movement of Fe diffusing through the film, the growth rate follows the parabolic law, the thickness of the oxide layer of Fe is calculated from the rate constant of the parabolic law, and the thickness increases at high temperatures. The ratio is estimated to be FeO: Fe3O4: Fe2O3 = 95: 5: 1. (Non-Patent Document 1). The chemical formulas are (1) 2Fe + O2 → 2FeO, (2) 6FeO + O2 → 2Fe3O4, (3) 4Fe3O4 + O2 → 6Fe2O3. Thus, the oxide film on the Fe surface grows while changing in the order of wustite, magnetite, and hematite, and hematite is generated on the oxide film surface. Cutting with a strong excess oxygen pressure like steel cutting generates magnetite and hematite on the steel surface, which reduces the fluidity of the cutting dross and causes the cutting dross to adhere to the lower surface of the steel and reduce the cutting speed. It has become.

As shown in FIG. 1, by using fluoride that does not contain any oxygen in the vaporization flux, the reducing elements K, Na, B, Si, and Al are continuously released from the flame. The borate glass film mixed with B2O3, NaO2, and KO2 reacts with the excess oxygen in the film and sticks to the FeO surface, so that cutting with little formation of Fe3O4 or Fe2O3 is possible. The generated cutting dross contains SiO2 and ALO3, which protects the dross surface with a heat resistant film at 2100-3500 ° C. The cutting dross improves fluidity and reduces welding to the lower surface of the steel material. The subsequent cutting dross removal work becomes easy.

Since σ iron and α iron are body-centered cubic lattices and the intermolecular gap is as small as 0.04 nm, it is difficult to make interstitial solids. However, γ iron is a face-centered cubic lattice and the intermolecular gap is large at 0.11 nm, so the vaporization flux The elements inside are easy to penetrate. Fluorine has an electronegativity of 4 and a molecular radius of 0.72 mm, and is easy to bind to any element and easily enter γ-iron more than hydrogen. The electronegativity of K is 0.8, the molecular radius is 2.27Å, the electronegativity of Na is 0.9, the molecular radius is 1.54Å, the electronegativity of B is 2.0, and the molecular radius is 0.83 、. Is relatively large, it cannot enter between γ-iron molecules, but it easily combines with F to form KF, NaF, and BF2. Even if KF, NaF, BF2, Na3ALF6, K3ALF6 are decomposed into K, Na, B, AL as reducing elements in the cutting flame, K + F → KF, Na + F → NaF, B + 3F → BF3, Na3ALF6 → In order to release heat of decomposition by recrystallization with 3NaF + ALF3 (melting point 1040 ° C., boiling point 1880 ° C.), the cutting blade is made smooth to prevent welding. Boric acid (H3BO3) (melting point 180 ° C., boiling point 800 ° C.) is often used in the conventional liquid flux, but in the case of steel cutting, the cutting flame temperature is 3500-4000 ° C., so boric acid is heat resistant. Intolerable. K and Na in the vaporized flux may burn as soon as they exit the cutting crater, but the outer periphery of the cutting flame is forcibly cooled by air, so KF (melting point 860 ° C., boiling point 1505 ° C.), NaF (melting point 995) C., boiling point 1705.degree. C.) and the like, and the heat of decomposition is released at this time, so that the cutting dross is lowered to improve the fluidity.

Even when not only fluoride but also oxide is added to the vaporized flux (liquid vaporized) as in the past, the cutting dross is made mainly of wustite because the oxidation rate of the cutting dross can be suppressed in steel cutting. Therefore, the cutting speed was improved by 20%, the oxygen consumption was reduced by 25%, and the cutting width was reduced by 20% compared to the cutting without using the vaporized flux. However, the conventional vaporization flux contains a large amount of oxide, and this oxide contains 45 to 55% oxygen by weight. Due to the oxygen contained in this oxide, the vaporization flux had a high temperature oxidation action, and part of the wustite was changed to hematite or magnetite. It has the effect of counteracting the action of reducing elements such as potassium (K), sodium (Na), boron (B), calcium (Ca), aluminum (AL), fluorine (F), etc. contained in the vaporization flux. Na, K, Ca, and AL are effective in preventing oxidation of the melted portion, and F and B have the effect of improving the fluidity of the melted portion and reducing the surface tension.

Therefore, as a component of the vaporizing flux for cutting (the liquid flux is vaporized), the oxides contained in the conventional liquid flux are potassium (K), sodium (Na), boron (B), calcium (Ca ), Aluminum (AL), fluorine (F) and the like, it is necessary to replace with a fluoride composed of a reducing element. Fluorine, which is a halogen element, is highly negative and easily reacts with everything. When it is cut at high temperature, it becomes a salt bath and produces a reducing action, so that wustite is prevented from being oxidized to hematite or magnetite. In the present invention, in order to suppress the oxidation rate of the cutting dross, the liquid flux does not contain any oxide, and by selecting and dissolving only fluoride from inorganic compounds mainly composed of reducing elements, higher orders such as magnetite and hematite are used. By suppressing the generation of oxides and lowering the melting point, it was possible to improve cutting speed, prevent cutting dross welding, and reduce cutting width.

The main components of the conventional liquid flux are roughly classified into fluoride and oxide. Fluorides include potassium hydrogen fluoride (KHF2), potassium fluoride (KF), sodium fluoride (NaF), sodium aluminum fluoride (Na3ALF6), aluminum potassium fluoride (K3ALF6), boron fluoride (BF2), and boron fluoride. Potassium fluoride (KBF4), sodium borofluoride (NaBF4), hydrogen borofluoride (HBF2), and the like. Examples of the oxide include boric acid (H3BO3), boron oxide (B2O3), borax (Na2B4O7), potassium borate (K2B4O7), potassium oxide (K2O), sodium oxide (Na2O), phosphorus pentoxide (P2O5), and the like. . When a combustion gas is blown into a liquid flux to form a vaporized flux, the components that are easily evaporated in the liquid flux come out together with the combustion gas first, so that the oxides that are difficult to evaporate remain and are concentrated to recrystallize unreacted substances. So it was cloudy white. In particular, phosphorus pentoxide was the biggest cause of cloudiness. In the present invention, the liquid flux only of fluoride containing no oxide is generated to prevent the adhesion of cut dross and the precipitation of dissolved components in the liquid flux.

A second solution is a liquid flux obtained by dissolving the prepared fluoride and the organic halogen compound in a solvent such as alcohol or acetone.

Organohalogen compounds are easily dissolved in alcohols and acetone, but their melting point and boiling point are higher than these solvents and are difficult to evaporate. When a combustion gas is blown into the liquid flux to generate a vaporized flux, even if alcohol or acetone is vaporized, the organic halogen compound remains, so that the dissolved component of the liquid flux is difficult to concentrate. Therefore, the dissolved component does not precipitate in the liquid flux and does not become cloudy white. In addition, since no oxide is used, the components in the vaporized flux are not deposited in the piping for transporting the vaporized flux.

According to a third solution, the compounded fluoride is composed of potassium fluoride (KF), sodium fluoride (NaF), trifluoride. Boron fluoride (BF3), calcium fluoride (CaF2), silicon tetrafluoride (SiF4), potassium borofluoride (KBF4), sodium borofluoride (NaBF4), ammonium borofluoride (NH4BF4), tetrafluoroboric acid (HBF4), Potassium silicofluoride (K2SiF6), sodium aluminum fluoride (Na3ALF6), potassium aluminum fluoride (K3ALF6), hexafluorosilicic acid (H2SiF6), sodium silicofluoride (Na2SiF4), acidic potassium fluoride (KHF2), sodium hydrogen fluoride (NaHF2), acidic ammonium fluoride (NH4H) F4) is a liquid flux selected from among organic halogen compounds such as methylamine hydrochloride (CH3NH2HCl) or diethylamine hydrochloride ((C2H3) NH.HCl) and dissolved in a solvent such as alcohol or acetone.

Examples of reducing elements include potassium (K), sodium (Na), boron (B), calcium (Ca), and aluminum (AL). Potassium fluoride (KF) and sodium fluoride (NaF) associated with these elements. ), Boron trifluoride (BF3), calcium fluoride (CaF2), and aluminum fluoride (ALF3) exceed the temperature range that functions as a vaporization flux because the cutting dross has a high melting point, and the reduction action becomes difficult. Therefore, potassium borofluoride (KBF4), sodium borofluoride (NaBF4), potassium silicofluoride (K2SiF6), acidic potassium fluoride (KHF2), sodium hydrogen fluoride (NaHF2), hexafluorosilicic acid (H2SiF6), aluminum fluoride A highly reducible liquid flux can be generated by combining fluorides that are inorganic compounds such as sodium (Na3ALF6) and potassium aluminum fluoride (K3ALF6).

Potassium silicofluoride (K2SiF6) is decomposed to (KF + SiF). KHF is decomposed into (KF + HF). Sodium aluminum fluoride (Na3ALF6) is decomposed to (3NaF + ALF3). Aluminum fluoride aluminum (K3ALF6) is decomposed to (3KF + ALF3). Fluoride decomposes to lower the melting point of the cutting dross and recrystallizes again during cutting to return to its original state. Decomposes the combined heat and absorbs the combined heat to prevent solidification of the cutting dross and improve fluidity. In this way, potassium fluoride (KF) (melting point 860 ° C.) is added to the cutting flame by adding strong high electronegativity fluorine to B, K, Na, AL, and Ca that make the reducing flame that is the main cutting force. , Boiling point 1505 ° C.), sodium fluoride (NaF) (melting point 995 ° C., boiling point 1705 ° C.), boron trifluoride (BF 3) (melting point −126 ° C., boiling point −100.3 ° C.), aluminum trifluoride (ALF 3) (Melting point: 1040 ° C, boiling point: 1880 ° C), calcium fluoride (melting point: 1402 ° C, boiling point: 2500 ° C) prevents the adhesion of dross by cleaning the cutting surface and reducing the melting point of the cutting dross and improving the fluidity. To do.

By combining fluoride with organic halogens such as methylamine hydrochloride and diethylamine hydrochloride, when the liquid flux is vaporized into a vaporized flux, the concentration of dissolved components in the liquid flux can be suppressed, thus preventing precipitation. . Methylamine hydrochloride (CH3NH2HCl) has a melting point of 170-173 ° C and a boiling point of 225-226 ° C. Diethylamine hydrochloride ((C2H3) NH.HCl) has a melting point of 223 to 225 ° C and a boiling point of 320 to 330 ° C. Methylamine hydrochloride and diethylamine hydrochloride are easily dissolved in alcohols such as methanol and ethanol, which are liquid flux solvents, but have a melting point and a boiling point higher than those solvents and are difficult to evaporate. When generating a vaporized flux by blowing a combustion gas into the liquid flux, methylamine hydrochloride or diethylamine hydrochloride remains even if alcohol or acetone is vaporized, so that the dissolved components of the liquid flux are difficult to concentrate, and halogen Chlorine (Cl) produces chloride. Therefore, the dissolved component does not precipitate in the liquid flux and does not become cloudy white. In addition, since no oxide is used, the components in the vaporized flux are not deposited in the piping for transporting the vaporized flux.

Blending 300 grams of fluoride of KBF4 and NaBF4 to make a blended fluoride, K: 15.53%, Na: 10.47%, B: 9.2%, F: 64.79% by weight ratio I made it. This fluoride was dissolved in 700 grams of ethanol by a method disclosed in Japanese Patent Laid-Open No. 2010-100441 to produce a 30% liquid flux. When C3H6 was blown into a vaporizer disclosed by Japanese Patent Laid-Open No. 2009-255105 to vaporize the liquid flux to generate the vaporized flux and cut the steel material, it was able to be cut without adhesion of cutting dross.

Blending 300 grams of fluoride of KBF4 and NaBF4 to make a blended fluoride, K: 15.53%, Na: 10.47%, B: 9.2%, F: 64.79% by weight ratio I made it. This fluoride and diethylamine hydrochloride ((C2H3) NH · HCl) solution 350 were mixed, and then dissolved in 350 grams of ethanol by a method disclosed in Japanese Patent Application Laid-Open No. 2010-100441 to produce a 30% concentration liquid flux. When this liquid flux was blown into a vaporizer disclosed in Japanese Patent Application Laid-Open No. 2009-255105, C3H6 was vaporized to generate the vaporized flux, and the steel material was cut. As a result, the cutting dross could be cut with little adhesion.

300 g of fluoride of (KBF4), (NaBF4), (3NaFALF3), (Na2SiF6), and (3KFALF3) was prepared as a blended fluoride, and K: 14.61%, Na: 14.67%, B: 6.94%, Si: 0.879%, AL: 2.771%, F: 60.13%. Si and AL are oxidatively bonded to each other at high pressure during cutting to form oxides having high heat resistance as SiO2 and AL2O3, thereby preventing attachment of cut molten iron and oxides of FeO, FeO3 and Fe3O4 during lowering. By making K and Na almost the same number, the function of reducing element B is substituted to protect K2O and Na2O as a reducing flame over a wide range of temperatures between 350 ° C and 1275 ° C. F cuts the cleansing action and the intermolecular bonding force, so that the force to prevent adhesion of the lower surface dross was strengthened by instantaneously generating molecular dissociation heat in the convective flame column.

Claims (3)

        One or more of fluorides containing any of potassium (K), boron (B), sodium (Na), calcium (Ca), silicon (Si), aluminum (Al), and nitrogen (N) A liquid flux characterized by dissolving a prepared fluoride prepared by selecting the above-mentioned fluoride and having a fluorine (F) content of 30 to 70% by weight in a solvent of alcohol or acetone.       The liquid flux according to claim 1, wherein the prepared fluoride and the organic halogen compound are dissolved in a solvent of alcohol or acetone.             The prepared fluoride is potassium fluoride (KF), sodium fluoride (NaF), boron trifluoride (BF3), calcium fluoride (CaF2), silicon tetrafluoride (SiF4), potassium borofluoride (KBF4), Sodium borofluoride (NaBF4), ammonium borofluoride (NH4BF4), tetrafluoroboric acid (HBF4), potassium silicofluoride (K2SiF6), hexafluorosilicic acid (H2SiF6), sodium silicofluoride (Na2SiF4), acidic potassium fluoride (KHF2) ), Sodium hydrogen fluoride (NaHF2), sodium aluminum fluoride (liquid crystal stone) Na3AlF6, potassium aluminum fluoride (potassium calcite) K3AlF6, acidic ammonium fluoride (NH4HF4), Methylamine hydrochloride (C 3NH2HCl) or diethylamine hydrochloride ((C2H3) NH · HCl) as well as characterized in that dissolved in an alcohol or acetone solvent claim 1 or claim 2 wherein the liquid flux.

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