Classifications

• • 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, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
  • B23K35/362—Selection of compositions of fluxes
• • 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
  • B23K9/00—Arc welding or cutting
  • B23K9/18—Submerged-arc welding

Definitions

• the present invention relates to a flux used for submerged arc welding, and more particularly to a flux for submerged arc welding, which is excellent in welding workability, especially slag peeling property. It also relates to a submerged arc welding method using the flux and a method for producing the flux.
• Patent Documents 1 and 2 the content of the components constituting the flux is specified, and the ratio of the MgO content to the Al 2 O 3 , CaF 2 conversion value and the total content of TiO 2 is specified. It is disclosed that the welding workability is improved regardless of whether the welding current is an AC type or a DC type. Further, Patent Documents 1 and 2 also disclose that the amount of diffusible hydrogen in the weld metal can be reduced, and Patent Document 2 discloses that the amount of moisture absorbed by the flux can be reduced.
• the beads tend to have a convex shape, and it is particularly difficult to secure the slag peelability of the toe.
• the present inventor focused on the element Mn and found that the more Mn was added, the better the slag peeling property was.
• the addition of Mn induces the generation of iron grain protrusions (hereinafter, simply referred to as "iron grains") and pock marks, and there remains a problem in terms of bead appearance or surface defects, which is one of welding workability. ..
• the present invention has been made in view of the above circumstances, and provides a flux for submerged arc welding having excellent slag peelability while suppressing the occurrence of surface defects such as iron grains and pock marks regardless of construction conditions.
• the purpose is to do.
• the flux according to one aspect of the present invention is used for submerge arc welding and contains a fluoride and an oxide.
• the oxide has a high melting point oxide having a melting point of 1800 ° C. or higher and a melting point of 1800 ° C. It is composed of a low melting point oxide of less than, and contains an oxide containing Ca as the high melting point oxide and an oxide containing Mn as the low melting point oxide, and the content of Mn with respect to the total mass of the flux is
• the MnO conversion value is 2 to 8% by mass, and the MnO conversion value, the CaF 2 conversion value of F, the CaO conversion value of Ca, and CO 2 are 1.6 ⁇ ⁇ CaF 2 conversion value / (MnO conversion value + CaO conversion value).
• the ratio of the total content of the refractory oxides to the total content of the oxides Is a flux for submerged arc welding having a value of 0.56 or more.
• the refractory oxide contains at least one of MgO and TiO 2 , and the content of Mg with respect to the total mass of the flux is 25% by mass or less in terms of MgO and Ti converted to TiO 2.
• the value is 9% by mass or less, and the ratio of the total content of the MgO conversion value and the TiO 2 conversion value to the total content of the refractory oxide ⁇ (MgO conversion value + TiO 2 conversion value) / high
• the total content of the melting oxide oxide ⁇ may be 0.430 or more.
• the content of the refractory oxide with respect to the total mass of the flux is such that the CaO conversion value is 10% by mass or less, the Al 2 O 3 conversion value of Al is 25% by mass or less, and the above.
• the MgO conversion value, the TiO 2 conversion value, the CaO conversion value, and the Al 2 O 3 conversion value are 30 ⁇ (MgO conversion value + 0.67 TiO 2 conversion value + 0.92 CaO conversion value + 0.74 Al 2 O 3 conversion value).
• the relationship of ⁇ 50 may be satisfied.
• the content of the low melting point oxide with respect to the total mass of the flux is such that the SiO 2 equivalent value of Si is 20% by mass or less, the FeO equivalent value of Fe is 5% by mass or less, and B 2 of B. O 3 conversion value is 1 wt% or less, and alkali metal oxides converted value of the alkali metal element may be not more than 5.0 mass%.
• the alkali metal oxide conversion value may be a value converted to at least one oxide selected from the group consisting of Na 2 O, K 2 O and Li 2 O. ..
• the content of the flux with respect to the total mass of the flux may be such that the CaF 2 conversion value is 20% by mass or more and the CO 2 is 6.0% by mass or less.
• the welding method according to one aspect of the present invention is a submerged arc welding method in which arc welding is performed using a flux, and the flux contains a fluoride and an oxide, and the oxide has a melting point of 1800.
• the content of Mn with respect to the total mass of the flux is 2 to 8% by mass
• the MnO conversion value, the CaF 2 conversion value of F, the CaO conversion value of Ca, and CO 2 are 1.6.
• the material to be welded may have a U groove or a V groove processed, and the groove angle may be 10 to 60 °.
• the method for producing a flux is a method for producing a flux used for submerge arc welding, which comprises a step of firing a granulated product derived from a raw material at 400 to 950 ° C., after the step of firing.
• the flux contains a fluoride and an oxide, and the oxide is composed of a high melting point oxide having a melting point of 1800 ° C. or higher and a low melting point oxide having a melting point of less than 1800 ° C. It contains an oxide containing Ca as an oxide and an oxide containing Mn as the low melting point oxide, and the content of Mn with respect to the total mass of the flux is 2 to 8% by mass in terms of MnO and is converted to MnO.
• the value, the CaF 2 conversion value of F, the CaO conversion value of Ca, and CO 2 satisfy the relationship of 1.6 ⁇ ⁇ CaF 2 conversion value / (MnO conversion value + CaO conversion value + CO 2 ) ⁇ , and the total of the oxides.
• the ratio of the total content of the refractory oxides to the content of (total content of refractory oxides / total content of oxides) is 0.56 or more. It is a manufacturing method.
• the present invention it is possible to provide a flux for submerged arc welding having excellent slag peelability while suppressing the generation of iron grains and pock marks.
• a flux for submerged arc welding having excellent slag peelability while suppressing the generation of iron grains and pock marks.
• the flux for submerged arc welding according to the present embodiment (hereinafter, may be simply referred to as “flux”) contains a fluoride and an oxide, and the oxide has a high melting point of 1800 ° C. or higher. It is composed of a melting point oxide and a low melting point oxide having a melting point of less than 1800 ° C., and includes an oxide containing Ca as the high melting point oxide and an oxide containing Mn as the low melting point oxide.
• the MnO conversion value of Mn is 2 to 8% by mass
• the MnO conversion value, the CaF 2 conversion value of F, the CaO conversion value of Ca and CO 2 are 1.6 ⁇ ⁇ CaF 2
• the relationship of conversion value / (MnO conversion value + CaO conversion value + CO 2 ) ⁇ is satisfied.
• the ratio of the total content of the refractory oxide to the total content of the oxide is 0.56 or more.
• the refractory oxide examples include MgO, TiO 2 , CaO, Al 2 O 3 , ZrO 2 , BaO and the like.
• the flux can also contain low melting point oxides having a melting point of less than 1800 ° C., for example, MnO, MnO 2 , Mn 2 O 3 , SiO 2 , B 2 O 3 , FeO, Fe 2 O 3 , Examples include Fe 3 O 4 and alkali metal oxides.
• the content in the present embodiment means mass% with respect to the total mass of the flux unless otherwise specified.
• a part of each component constituting the flux has a converted value obtained by converting the amount of each element obtained in the analysis into an oxide or a fluoride based on JIS Z3352: 2017 or the like. Therefore, the total content of each component with respect to the total mass of the flux may exceed 100% by mass.
• the MnO conversion value is a value obtained by converting the total amount of Mn of the flux into MnO.
• the total amount of Mn to be measured may include components other than MnO such as MnO 2 and Mn 2 O 3 , but since these components have almost the same effect, the MnO conversion value of all Mn is described above. It suffices if it is within the specified range.
• MnO is an essential component that affects the viscosity and solidification temperature of slag and is effective in improving the slag exfoliation property.
• the mechanism of iron grain generation is considered as follows. First, the iron powder in the flux aggregates in the molten slag to form large metal particles and settle. At that time, if the bead surface is in a molten state, the metal particles become weld metal as they are, but if the bead surface is in a solidified state, the metal particles adhere to the bead surface and become iron particles. That is, when the metal particles settle in the molten slag, the generation of iron particles can be suppressed if the bead surface is in the molten state. In order to bring the bead surface into a molten state, a method of raising the solidification temperature of the slag can be mentioned. On the other hand, the melting point of MnO is about 1785 ° C., which is not a high melting point oxide. Therefore, it is considered that if the MnO content is too high, iron particles are likely to be generated.
• the content of Mn in the MnO conversion value in the present embodiment is 2% by mass or more, preferably 2.5% by mass or more, and more preferably 3% by mass or more.
• the MnO conversion value is 8% by mass or less, preferably 7.5% by mass or less, and more preferably 7% by mass or less.
• the CaF 2 conversion value is a value obtained by converting the total amount of F of the flux into CaF 2 .
• the total amount of F to be measured may contain fluoride other than CaF 2 , such as AlF 3 and MgF 2, but regardless of the form, it has almost the same effect as CaF 2 as a fluoride.
• the CaF 2 conversion value of the total amount of F may be within the above-mentioned range.
• Fluoride is a component that suppresses the generation of pock marks and enhances the electrical conductivity and fluidity of slag.
• the action related to fluidity is proportional to the abundance of CaO, which will be described later, and is one of the components that affect the high-temperature viscosity of slag.
• the content of F in the CaF 2 conversion value in the present embodiment is preferably 20% by mass or more, more preferably 25% by mass or more, from the viewpoint of suppressing the generation of pock marks by promoting the discharge of gas from the molten slag. , 27% by mass or more is more preferable.
• the CaF 2 conversion value is preferably 35% by mass or less, and more preferably 33% by mass or less.
• the MgO conversion value is a value obtained by converting the total amount of Mg in the flux into MgO.
• MgO is a high melting point oxide having a melting point of 2800 ° C. and greatly contributes to the improvement of slag exfoliation property.
• the content of Mg in terms of MgO is preferably 15% by mass or more, more preferably 16% by mass or more, and further preferably 17% by mass or more.
• the MgO conversion value is preferably 25% by mass or less, more preferably 24% by mass or less, and further preferably 23% by mass or less.
• TiO 2 conversion value of Ti is a value obtained by converting the total amount of Ti of the flux into TiO 2 .
• TiO 2 is a high melting point oxide having a melting point of 1870 ° C., and is an effective component for improving slag exfoliation property, and at the same time, has an effect of improving the bead appearance by adding an appropriate amount.
• a part of TiO 2 becomes Ti by the reduction reaction at the time of welding and is added to the weld metal, which also contributes to the improvement of toughness.
• the content of Ti in terms of TiO 2 is preferably more than 0% by mass, more preferably 0.1% by mass or more, still more preferably 0.2% by mass or more.
• the TiO 2 conversion value is preferably 9% by mass or less, more preferably 4% by mass or less, and further preferably 3.5% by mass or less.
• the CaO conversion value is a value obtained by converting the Ca amount obtained by subtracting the Ca amount contained in the CaF 2 conversion value converted from the total Ca amount of the flux from the total Ca amount of the flux into CaO.
• CaO is a high melting point oxide having a melting point of 257 ° C., and is a component that increases the basicity of slag, enhances the cleanliness of the weld metal, and affects the fluidity of slag. This action is proportional to the abundance thereof, and the lower limit of the content of Ca in terms of CaO is not particularly limited, but is preferably 0.5% by mass or more, for example.
• the CaO conversion value is preferably 10% by mass or less, more preferably 9.5% by mass or less, and further preferably 9% by mass or less.
• Al 2 O 3 conversion value of Al is a value obtained by converting the total amount of Al of the flux into Al 2 O 3 .
• Al 2 O 3 is a high melting point oxide having a melting point of 2072 ° C., which is a component that adjusts the viscosity and melting point of slag, and has the effect of raising the solidification temperature of slag and improving the bead shape during welding. ..
• the content of Al in terms of Al 2 O 3 is preferably 10% by mass or more, more preferably 12% by mass or more, and further preferably 15% by mass or more.
• the Al 2 O 3 conversion value is preferably 25% by mass or less, more preferably 20% by mass or less.
• the ZrO 2 conversion value is a value obtained by converting the total amount of Zr of the flux into ZrO 2 .
• ZrO 2 is a high melting point oxide having a melting point of 2715 ° C., which is a component for adjusting the viscosity and melting point of slag, and has an effect of raising the solidification temperature of slag and improving the bead shape at the time of welding. This action is proportional to the abundance thereof and is an arbitrary component.
• the lower limit of the content of Zr in terms of ZrO 2 is not particularly limited, but if a useful action is desired to be imparted, for example, 0 It is preferably 5.5% by mass or more.
• the ZrO 2 conversion value is preferably 5% by mass or less, and more preferably 3% by mass or less.
• the BaO conversion value is a value obtained by converting the total amount of Ba of the flux into BaO.
• BaO is a high melting point oxide having a melting point of 1923 ° C., and is a component that increases the basicity of slag, enhances the cleanliness of the weld metal, and affects the fluidity of slag. This action is proportional to the abundance and is an arbitrary component, and the lower limit of the content of Ba in the BaO conversion value is not particularly limited. However, if a useful action is desired to be imparted, for example, 0. 5% by mass or more is preferable.
• the BaO conversion value is preferably 5% by mass or less, and more preferably 3% by mass or less.
• the flux according to this embodiment contains a high melting point oxide having a melting point of 1800 ° C. or higher.
• the larger the ratio of MgO and TiO 2 the better the slag peeling property. Therefore, the sum of the MgO conversion value and the TiO 2 conversion value with respect to the total content of the high melting point oxide represented by ⁇ (MgO conversion value + TiO 2 conversion value) / total content of the high melting point oxide ⁇ .
• the content ratio is preferably 0.430 or more, more preferably 0.450 or more.
• the ratio is preferably 0.600 or less, more preferably 0.545 or less.
• the total content of the MgO conversion value, the TiO 2 conversion value, the CaO conversion value and the Al 2 O 3 conversion value which means the total content of the refractory oxide
• the flux contains ZrO 2 or BaO
• the contents of Zr in terms of ZrO 2 and Ba in terms of BaO are also included in the total content of the refractory oxide.
• the total content is too high, the solidification temperature of the slag becomes too high and pock marks are likely to occur.
• the content of these is preferably 30 or more, more preferably 32 or more, which is represented by the formula (MgO conversion value + 0.67 TiO 2 conversion value + 0.92 CaO conversion value + 0.74 Al 2 O 3 conversion value). .. Further, such a value is preferably 50 or less, more preferably 45 or less.
• Each coefficient multiplied by the content of each refractory oxide in the above formula is a coefficient weighted using the ratio of the melting points of MgO based on the melting point of 2800 ° C.
• the coefficient 0.67 applied to the TiO 2 conversion value is a value calculated by dividing the melting point of TiO 2 at 1870 ° C. by the melting point of MgO at 2800 ° C.
• the ratio of is 0.56 or more. By setting such a ratio to 0.56 or more, the slag solidification temperature can be raised and the generation of iron particles can be suppressed. Further, the upper limit is not particularly limited, but by setting the ratio to 0.80 or less, it is possible to prevent the slag solidification temperature from becoming higher than necessary and to preferably suppress the occurrence of pock marks.
• the value represented by (total content of refractory oxides / total content of oxides) is preferably 0.57 or more. Further, such a value is preferably 0.75 or less.
• the total content of oxides is an oxide equivalent value of an element forming a high melting point oxide having a melting point of 1800 ° C. or higher and an oxide of an element forming a low melting point oxide having a melting point of less than 1800 ° C. It means the sum with the converted value.
• Examples of low melting point oxides having a melting point of less than 1800 ° C. include MnO, MnO 2 , Mn 2 O 3 , SiO 2 , FeO, Fe 2 O 3, Fe 3 O 4, B 2 O 3 , and alkali metal oxides. Be done.
• Si SiO 2 conversion value is a value obtained by converting the total amount of Si of the flux into SiO 2 .
• SiO 2 is a component that satisfactorily adjusts the appearance and shape of the bead by imparting an appropriate viscosity to the molten slag.
• the content of Si in terms of SiO 2 is preferably 8% by mass or more, more preferably 11% by mass or more.
• the amount is too large, the viscosity of the slag becomes excessive, which may lead to deterioration of the slag peelability and severe slag seizure.
• the SiO 2 conversion value is preferably 20% by mass or less, more preferably 19% by mass or less, and even more preferably 17% by mass or less.
• SiO 2 and SiO 2 derived from the alloy although there is a SiO 2 from mineral and water glass, SiO 2 conversion value converted from from alloys such as Fe-Si in terms of good mechanical properties ensuring It is preferably 4% by mass or less, and the total SiO 2 conversion value of mineral-derived water glass is preferably 16% by mass or less from the viewpoint of slag peelability.
• the FeO conversion value is a value obtained by converting the total amount of Fe in the flux into FeO.
• the total Fe amount to be measured may include components other than Fe added as metal powder, such as FeO, Fe 2 O 3 and Fe 3 O 4 , but the FeO conversion value of the total Fe amount is described above. It suffices if it is within the specified range.
• Fe—Si is mentioned as an example of Fe added as a metal powder, and has an effect of mainly promoting the deoxidation phenomenon of the weld metal.
• FeO has the effect of increasing the pock mark resistance. This action is proportional to the abundance thereof, and the FeO conversion value of Fe is not particularly limited at the lower limit, but is preferably 0.5% by mass or more, for example.
• the FeO conversion value is preferably 5% by mass or less, and more preferably 4% by mass or less.
• the B 2 O 3 conversion value is a value obtained by converting the total amount of B of the flux into B 2 O 3 conversion.
• B 2 O 3 has the effect of improving the toughness of the weld metal.
• the content of B in terms of B 2 O 3 is preferably 0.1% by mass or more.
• B 2 O 3 in terms of value is preferably at most 1 mass%, more preferably 0.5 mass% or less.
• the alkali metal element is a component that mainly affects the arc stability at the time of welding and the moisture absorption property of the flux, and this action is proportional to the abundance thereof.
• the lower limit of the total amount of alkali metal oxide equivalent values of any element and alkali metal elements is not particularly limited, but 1% by mass or more is preferable when a useful action is to be imparted.
• the total amount of alkali metal oxide conversion values is preferably 5.0% by mass or less, more preferably 4.5% by mass or less.
• the alkali metal element preferably contains at least one element selected from the group consisting of Na, K and Li, and when it contains Na, it has a Na 2 O conversion value, and when it contains K, it has a K 2 O conversion value. If Li is contained, the content is defined by the Li 2 O conversion value. That is, it is preferable that the alkali metal oxide conversion value is a value converted to at least one oxide selected from the group consisting of Na 2 O, K 2 O and Li 2 O.
• the Na 2 O conversion value, the K 2 O conversion value, and the Li 2 O conversion value are all the total amounts of Na, K, or Li including those derived from the flux binder (binder) obtained in accordance with JIS M 8852: 1998.
• the total amount of Na, K or Li to be measured may include NaAlSi 3 O 8 , KAlSi 3 O 8 or LiAlSi 3 O 8, etc., but since they have the same effect, the Na 2 O conversion value, K The total amount of the 2 O conversion value and the Li 2 O conversion value may be within the above-mentioned range.
• the total amount of the Na 2 O conversion value and the K 2 O conversion value is preferably 1% by mass or more, preferably 5.0% by mass or less, and more preferably 4.5% by mass or less.
• CO 2 is a component mainly derived from carbonates such as CaCO 3 and BaCO 3 , and indicates CO 2 gas generated by decomposition of carbonates during welding.
• CO 2 gas shields the welded part from the outside air and reduces the partial pressure of impurity gases such as H 2 gas and N 2 gas, so it is an effective component for preventing intrusion into the weld metal. It is proportional to its abundance. It is an arbitrary component, and the lower limit of the CO 2 content is not particularly limited, but 0.5% by mass or more is preferable when it is desired to impart a useful action. On the other hand, if it is too large, it may cause the occurrence of pock marks and deteriorate the pock mark resistance. Therefore, the CO 2 content is preferably 6.0% by mass or less, more preferably 5.0% by mass or less, and even more preferably 4.5% by mass or less.
• the components other than the above in the flux according to the present embodiment are unavoidable impurities such as P and S, which affect the welding quality. Therefore, it is preferable to regulate P and S to 0.05% by mass or less, respectively.
• other elements may be contained as long as the effects of the present invention are not impaired. Examples of other elements include Ni, Cr, Mo, Nb, V and C.
• the total amount of these other elements is preferably 5.0% by mass or less. That is, the total of the above components excluding unavoidable impurities and other elements is usually 90% by mass or more, preferably 95% by mass or more.
• Mn represented by the MnO conversion value is a component that improves the slag exfoliation property, while its hygroscopicity induces the generation of pock marks.
• CaO and CO 2 are also components that tend to induce the development of pock marks.
• the fluoride defined by the CaF 2 conversion value is a component that suppresses the generation of pock marks.
• the ratio of the content represented by ⁇ CaF 2 conversion value / (MnO conversion value + CaO conversion value + CO 2 ) ⁇ is preferably 1.8 or more.
• the value is preferably 9.0 or less, more preferably 7.0 or less.
• the flux according to the present embodiment is preferably a high-temperature firing type flux in which a granulated product derived from a raw material is fired at 400 to 950 ° C.
• ⁇ Flux manufacturing method> When producing the flux according to the present embodiment, for example, a step of blending the raw material powder so as to have the composition described in the above ⁇ flux> and kneading with the binder, then a step of granulating, and a step of obtaining the obtained raw material. The step of firing the granulated product of No. 1 is included in this order.
• the binder in the kneading step for example, polyvinyl alcohol or water glass can be used.
• the granulation method in the granulation step is not particularly limited, but a method using a rolling granulator, an extrusion granulator, or the like is preferable.
• the granulated flux is preferably subjected to a sizing treatment such as dust removal and crushing of coarse particles to have a particle diameter of 2.5 mm or less. Firing after granulation can be performed in a rotary kiln, a stationary batch furnace, a belt firing furnace, or the like.
• the firing temperature at that time is preferably 400 to 950 ° C., more preferably 450 ° C. or higher, from the viewpoint of the hygroscopic characteristics of the flux.
• the flux according to the present embodiment obtained above has the content of each component within a specific range, it is excellent in slag peeling property while suppressing the generation of iron grains and pock marks.
• component composition of the flux of the present embodiment is suitable as a high-temperature firing type flux, it does not exclude the application as a molten type flux.
• the welding method according to the present embodiment is a submerged arc welding method in which arc welding is performed using a flux that satisfies the composition range described in ⁇ Flux>.
• Such a welding method is very useful for groove welding, which is one of the difficult welding methods, especially narrow groove welding. That is, the shape of the groove of the material to be welded, which is called the base material or the work, is not particularly limited, but it is more preferable that the U groove or the V groove is processed.
• the groove angle is preferably 10 ° or more, more preferably 15 ° or more.
• the groove angle is preferably 90 ° or less, more preferably 60 ° or less, and even more preferably 20 ° or less.
• the groove depth is preferably 20 mm or less, more preferably 15 mm or less, from the viewpoint of preventing the material to be welded from melting down.
• the root radius of the U groove is preferably R2 or more, more preferably R5 or more, from the viewpoint of preventing welding defects. Further, the root radius is preferably R10 or less, more preferably R8 or less, from the viewpoint of welding efficiency.
• the root radius is a welding term defined in JIS Z 3001-1: 2018.
• the numerical value of each component means the content and is expressed in mass% with respect to the total mass of the flux.
• R means an alkali metal element, but an alkali metal element other than Li, Na, and K is not included in any of the test examples.
• the "RO conversion value” means the total content of the alkali metal oxide conversion values of the alkali metal elements, but since alkali metal elements other than Li, Na, and K are not included in any of the test examples, It means the sum of the values converted into at least one oxide selected from the group consisting of Na 2 O, K 2 O and Li 2 O.
• the "high melting point oxide” means the total content of the elements forming the high melting point oxide having a melting point of 1800 ° C.
• the "low melting point oxide” means the total content of the elements forming the oxide having a melting point of less than 1800 ° C. in terms of oxide value. However, even when Fe 2 O 3 or Fe 3 O 4 is contained, the total Fe amount is converted into FeO, and even when MnO 2 or Mn 2 O 3 is contained, the total Mn amount is converted into MnO. To do.
• the “low melting point oxide” means the total amount of the MnO conversion value, the SiO 2 conversion value, the FeO conversion value, the B 2 O 3 conversion value, and the alkali metal oxide conversion value.
• the total of “oxides” means the total of the high melting point oxides and the low melting point oxides, and the total content is described in the high melting point oxides and the low melting point oxides as in Test Example 11, for example. The deviation from the sum of is due to significant figures.
• Test Example 1 for example, the fact that the total of "Si SiO 2 conversion values” deviates from the sum of the contents described for alloy-derived and mineral-derived is due to significant figures.
• the total content of all components may exceed 100% by mass, because the total amount of each element obtained by analysis is converted into oxide or fluoride. is there.
• submerged arc welding was performed using a steel plate as the material to be welded.
• the material to be welded, the wire used for welding, and the welding conditions are as shown below.
• the slag peelability and the occurrence rate of iron grains and pock marks were evaluated.
• Each evaluation method and evaluation standard are as follows. As a comprehensive evaluation, if any one of the evaluation results of slag peelability, iron grain and pock mark fails, it is judged that the flux is out of the applicable range and fails.
• ⁇ Slag peelability> The slag peelability is evaluated as follows for the ease of removing slag, but A and B pass and C fails. The results are shown in "Slag peeling" in Table 2.
• ⁇ Incidence rate of pock marks> The occurrence of pock marks on the bead surface was visually confirmed. The incidence is evaluated as follows, but A to C pass and D fails. The results are shown in "Pockmarks" in Table 2.
• D The number of pock marks generated per weld length of 750 mm on the bead surface is 6 or more.
• Test Examples 1 to 19 of Examples were excellent in slag peeling property and had a low occurrence rate of iron particles and pock marks.
• Test Examples 1 to 6, 10 to 12, and 14 to 16 two or more of the evaluations of slag peelability, iron grains, and pock marks were evaluated as A, which is very much as a flux used for submerged arc welding. It was good.

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