WO2018051823A1 - エレクトロスラグ溶接用ワイヤ、エレクトロスラグ溶接用フラックス及び溶接継手 - Google Patents
エレクトロスラグ溶接用ワイヤ、エレクトロスラグ溶接用フラックス及び溶接継手 Download PDFInfo
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- WO2018051823A1 WO2018051823A1 PCT/JP2017/031694 JP2017031694W WO2018051823A1 WO 2018051823 A1 WO2018051823 A1 WO 2018051823A1 JP 2017031694 W JP2017031694 W JP 2017031694W WO 2018051823 A1 WO2018051823 A1 WO 2018051823A1
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Definitions
- the present invention relates to a wire used for electroslag welding of cryogenic steel 5.0 to 10.0% Ni steel applied to a tank for storing liquefied natural gas or the like at a low temperature or a chemical plant to be used, and to be used for the welding.
- the present invention relates to a flux and a welded joint obtained by using these welding materials.
- 9% Ni steel has high strength and excellent cryogenic toughness of about liquid nitrogen temperature (-196 ° C). Therefore, 9% Ni steel is widely used as a base material for manufacturing a storage tank stored at a low temperature such as liquefied natural gas (Liquid Natural Gas, LNG) by welding. These storage tanks are required to have excellent cryogenic toughness in a temperature range of ⁇ 162 ° C. or lower, which is a temperature range of a liquid such as LNG. Therefore, the weld metal (welded joint) of a welded joint formed by welding 9% Ni steel is similarly required to have excellent cryogenic toughness.
- LNG liquefied natural gas
- Patent Documents 1 to 4 propose a welding solid wire for cryogenic steel or a flux-cored wire for gas shielded arc welding.
- both inventions are pure Ar or gas shielded arc welding using 2% or less oxygen, carbon dioxide gas or He gas in Ar, and the heat input is about 1.4 to 2.2 kJ / mm compared to TIG welding.
- the efficiency is improved, a construction method with higher efficiency is desired.
- An object of the present invention is to provide a welded joint having a weld metal having a high efficiency of, for example, a heat input of 10 kJ / mm or more and excellent mechanical properties such as strength and cryogenic properties.
- the inventors of the present invention have also studied a high-efficiency welding method capable of obtaining predetermined mechanical properties with a weld metal joint of about 5.0 to 10.0% Ni from the Ni base in the welding material.
- a high-efficiency welding method capable of obtaining predetermined mechanical properties with a weld metal joint of about 5.0 to 10.0% Ni from the Ni base in the welding material.
- the present inventors have found an electroslag welding wire and flux capable of performing highly efficient welding with a heat input of 10.0 kJ / mm or more and obtaining predetermined mechanical characteristics, and a weld metal chemical component system using them.
- the wire for electroslag welding of the present invention that can solve the above-mentioned problems is in mass% per total mass of the wire, C: more than 0%, 0.07% or less, Si: more than 0%, 0.50% or less, Mn: more than 0%, 1.0% or less, Ni: 6.0 to 15.0%, Fe: 79% or more, And it is the wire for electroslag welding characterized by satisfying following formula (1). 0.150 ⁇ C + Si / 30 + Mn / 20 + Ni / 60 ⁇ 0.300 (1)
- electroslag welding wire of the present invention that can solve the above-mentioned problems is, % By mass C: more than 0%, 0.07% or less, Si: more than 0%, 0.50% or less, Mn: more than 0%, 1.0% or less, Ni: 6.0 to 15.0%, Fe: 79% or more, and Containing at least one element selected from the group consisting of Cu, Cr, Mo, W, Nb, V, and B; And it is the wire for electroslag welding characterized by satisfying following formula (2). 0.150 ⁇ C + Si / 30 + W / 30 + Mn / 20 + Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + Nb / 10 + V / 10 + 5 ⁇ B ⁇ 0.300 (2)
- the electroslag welding wire contains at least one element selected from the group consisting of Ca, Mg, REM, Zr, Al, and Ti, And it is characterized by satisfying the following formula (3). 0.001 ⁇ 1.6 (Ca + Mg) +1.25 (REM + Zr) + Al + 0.8Ti ⁇ 0.70 (3)
- the electroslag welding wire is a solid wire or a flux-cored wire.
- the electroslag welding wire includes more than 0% and not more than 15% of the slag forming agent with respect to the total mass of the wire, and the slag forming agent is SiO 2 , CaO, CaF 2 , BaF. 2 , MgO, Al 2 O 3 , MnO, TiO 2 , ZrO 2 , FeO, Na 2 O, K 2 O, and at least one selected from the group consisting of BaO and satisfying the following formula (4) It is the flux-cored wire characterized by this.
- the electroslag welding wire is subjected to Cu plating.
- the flux of the present invention capable of solving the above problems is a flux used for electroslag welding together with the electroslag welding wire according to any one of the above, and in mass%, SiO 2 : 0 to 35%, CaO: 5 to 60%, CaF 2 : 3 to 50%, BaF 2 : 0 to 20%, MgO: 0 to 20%, Al 2 O 3 : 0 to 65%, MnO: 0 to 20%, TiO 2 : 0 to 10%, ZrO 2 : 0 to 10%, FeO: 0-5%, Na 2 O: 0 to 10%, K 2 O: 0 to 10%, BaO: 0 to 20%, Containing And it is the flux for electroslag welding characterized by satisfying following formula (5).
- the welded joint of the present invention capable of solving the above problems is a welded joint produced by electroslag welding using the electroslag welding wire according to any one of the above and the electroslag welding flux.
- the weld metal in the weld joint is mass%, C: more than 0%, 0.07% or less, Si: more than 0%, 0.50% or less, Mn: more than 0%, 1.0% or less, Ni: 6.0 to 15.0%, And the balance consists of Fe and inevitable impurities, And it is a welded joint characterized by satisfying following formula (6). 0.150 ⁇ C + Si / 30 + Mn / 20 + Ni / 60 ⁇ 0.300 (6)
- the other welded joint of this invention which can solve the said subject is a welded joint produced by electroslag welding using the electroslag welding wire in any one of the above, and the electroslag welding flux.
- the weld metal in the weld joint is mass%, C: more than 0%, 0.07% or less, Si: more than 0%, 0.50% or less, Mn: more than 0%, 1.0% or less, Ni: 6.0 to 15.0%, And containing at least one element selected from the group consisting of Cu, Cr, Mo, W, Nb, V, and B, the balance consisting of Fe and inevitable impurities, And it is a welded joint characterized by satisfy
- the weld joint further includes the weld metal further containing, by mass%, O: 0% or more and 0.025% or less N: 0% or more and 0.010% or less.
- the welded joint uses a steel plate containing 5 to 10% Ni as a base material.
- a welded joint having a weld metal excellent in strength and cryogenic toughness even during high heat input welding with a heat input of, for example, 10 kJ / mm or more.
- FIG. 1 is a diagram illustrating a schematic configuration of groove welding in the embodiment.
- the present inventors have studied by applying electroslag welding, which has not been studied so far, as a high heat input welding method using a welding material of about 6.0 to 15.0% Ni. Was done.
- a welding material whose components are appropriately adjusted is used, a welded joint having a weld metal having excellent strength and cryogenic toughness can be obtained even during high heat input welding where the heat input is, for example, 10 kJ / mm or more.
- the present invention was completed.
- electroslag welding is a method in which a welding wire is placed in a molten slag bath, and the base material and the welding wire are melted mainly using Joule heat of the molten slag as a heat source.
- electroslag welding it is possible to perform upright welding of a structure having a large plate thickness in one pass, such as in shipbuilding and industrial machinery fields. Upright welding of the above structure has been performed by electrogas arc welding so far, but there have been problems in the work environment such as arc radiation heat, fume, and sputtering for the welding operator.
- the shield deteriorates and the mechanical performance of the welded portion deteriorates.
- an electroslag welding wire may be simply referred to as a wire.
- % means “% by mass” unless otherwise specified.
- ⁇ means that the value is not less than the lower limit value and not more than the upper limit value.
- the components of the wire for electroslag welding according to the present invention are as follows.
- a flux-cored wire is preferably used.
- the component of the electroslag welding wire is the total mass of the flux-cored wire by mass% of each component contained in the flux-cored wire. It is specified by the ratio to. Note that the total mass of the flux-cored wire refers to the total mass of the hoop and the flux.
- C more than 0% and 0.07% or less C is an element that contributes to securing strength by forming a solid solution strengthening and a compound.
- the C content is preferably 0.003% or more.
- the amount of C is 0.07% or less. To do.
- the amount of C is preferably 0.05% or less.
- Si more than 0%, 0.50% or less Si is a deoxidizing element and has an effect of improving cryogenic toughness by lowering the oxygen concentration in the weld metal.
- the Si amount is preferably 0.003% or more.
- excessive addition of Si causes an excessive increase in strength and decreases the cryogenic toughness, so the Si content is 0.50% or less.
- the amount of Si is preferably 0.40% or less.
- Mn more than 0% and 1.0% or less Mn is an element that contributes to securing strength by solid solution strengthening.
- the amount of Mn is preferably 0.01% or more.
- the Mn content is 1.0% or less.
- the amount of Mn is preferably 0.9% or less.
- Ni 6.0 to 15.0%
- Ni is an essential element for ensuring low temperature toughness
- the amount of Ni is 6.0% or more.
- the amount of Ni is preferably 7.0% or more.
- excessive addition of Ni causes an increase in strength and decreases the cryogenic toughness, so the Ni content is made 15.0% or less.
- the amount of Ni is preferably 14.0% or less.
- Fe 79% or more Fe is a basic component like the target base material, and is 79% or more in order to secure the component continuity of the joint made of the base material and the weld metal. If it is less than 79%, it is necessary to add other alloy components or slag forming agents more than the specified amount. As a result, the strength of the weld metal becomes excessive and the cryogenic toughness is lowered.
- the amount of Fe is preferably 82% or more.
- the parameter of the formula (1) is preferably 0.160 or more, and more preferably 0.170 or more. On the other hand, if the parameter of the formula (1) exceeds 0.300, the strength of the weld metal becomes excessive, and the cryogenic toughness decreases. 0.290 or less is preferable and the parameter of Formula (1) has more preferable 0.280 or less.
- Cu, Cr, Mo, W, Nb, V, and B are elements that contribute to securing the strength.
- the parameter of the formula (2) is preferably 0.160 or more, and more preferably 0.170 or more.
- the parameter of the formula (2) exceeds 0.300, the strength of the weld metal becomes excessive, and the cryogenic toughness decreases. 0.290 or less is preferable and the parameter of Formula (2) has more preferable 0.280 or less.
- it further contains at least one element selected from the group consisting of Ca, Mg, REM, Zr, Al, and Ti, 0.001 ⁇ 1.6 (Ca + Mg) +1.25 (REM + Zr) + Al + 0.8Ti ⁇ 0.70 (3) Is preferably satisfied.
- the parameter of the formula (3) is preferably 0.001 or more.
- the cooling rate after welding is low, so that coarsening due to oxide aggregation and coalescence is likely to proceed. Therefore, when it adds excessively, a coarse oxide will increase, and the parameter of Formula (3) is 0.70 or less from a viewpoint of ensuring cryogenic toughness.
- the parameter of the formula (3) is more preferably 0.10 or more.
- the more preferable ranges of the contents of Ca, Mg, REM, Zr, Al, and Ti described above are as follows. More preferable range Ca: 0.0005 to 0.20% Mg: 0.0005 to 0.20% REM: 0.001 to 0.20% Zr: 0.001 to 0.15% Al: 0.001 to 0.20% Ti: 0.001 to 0.10%
- the remainder of the electroslag welding wire according to the present invention is, for example, inevitable impurities.
- inevitable impurities include P, S, As, Sb, Sn, Bi, O, and N.
- the above-mentioned elements of inevitable impurities and other elements may be positively added within a range not impairing the effects of the present invention.
- the surface of the electroslag welding wire of the present invention is preferably plated with Cu in order to enhance the electrical conductivity.
- the Cu plating amount is preferably 0.10% or more and 0.30% or less.
- the wire for electroslag welding of the present invention includes both solid wires and flux-cored wires.
- the flux-cored wire is one in which a flux is filled inside the outer skin (hereinafter also referred to as a hoop), is easy to design components, and is excellent in welding speed and welding efficiency.
- composition of the hoop is not particularly limited as long as the composition of the flux-cored wire is in the above range.
- the flux of the flux-cored wire is roughly classified into an oxide / fluoride type and a metal type, and the metal-based flux-cored wire is sometimes called a metal cored wire (MCW).
- MCW metal cored wire
- the flux filling rate of the flux-cored wire is preferably 5 to 25%. Outside these ranges, there are problems such as deterioration in workability.
- the flux filling rate defines the filling rate of the flux filled in the hoop as a ratio with respect to the total mass of the wire.
- the total mass of the wire means the total mass of the hoop and the flux.
- the flux of the flux-cored wire is roughly classified into an oxide / fluoride type and a metal type.
- the metal type satisfies the above-mentioned wire composition range, and the oxide / fluoride (slag forming agent) is the total mass of the wire. to 0 percent, contain more than 15%, and SiO 2, CaO, CaF 2, BaF 2, MgO, Al 2 O 3, MnO, TiO 2, ZrO 2, FeO, Na 2 O, K 2 O, And at least one selected from the group consisting of BaO and satisfying the following formula (4).
- CaO in the formula (4), notation of the components such as CaF 2 are the respective content per total mass of the wire (mass%).
- the slag forming agent melts and slags during electroslag welding, and the slag protects the molten metal and prevents nitrogen and oxygen from being mixed in from the atmosphere. Furthermore, by defining within the range of the composition formula (4) of the slag forming agent, the oxygen content of the weld metal is reduced and the cryogenic toughness is improved. It is preferable that the parameter of Formula (4) is 1.00 or more, and it is more preferable that it is 1.30 or more.
- carbonates such as CaCO 3 , BaCO 3 , MgCO 3 may be used as a slag forming agent as a flux filler filled in the hoop, but the carbonate decomposes by heat during welding, and CO 2 gas is Occurs and the amount of oxygen in the weld metal increases, affecting the cryogenic toughness. Therefore, preferably carbonate is not used in the flux filler.
- the calculation of the parameter of the above formula (4) takes into account that the carbonate is decomposed by heat, excluding the CO 2 component from the actual carbonate weight, and CaCO 3 to CaO amount respectively. BaCO 3 is converted into BaO amount and MgCO 3 is converted into MgO amount.
- the manufacturing method of the flux-cored welding wire is not particularly limited, and may be manufactured by a general process. For example, a mild steel hoop is molded into a U-shape, and the U-shaped molding hoop is filled with a flux, then molded into a cylindrical mold filled with the flux, and drawn to a desired diameter.
- flux In electroslag welding, additional flux is added to compensate for molten slag that decreases as welding progresses. This flux is simply referred to as flux in this specification.
- the molten metal In electroslag welding, as the welding progresses, the molten metal is cooled to become the weld metal, and a part of the molten slag bath becomes the molten slag layer, but as the welding progresses, the molten slag layer is cooled to become solidified slag and melts. Slag is consumed. Flux is used to compensate for this decrease in molten slag bath.
- the flux is roughly classified into a melt type flux and a bond type (fired type) flux.
- the melt-type flux is produced by melting and pulverizing various raw materials in an electric furnace or the like.
- the calcining flux is produced by combining various raw materials with a binder such as alkali silicate, granulating, and calcining.
- the firing flux may use the above-mentioned carbonate as a raw material, but the carbonate is decomposed by heat during welding, generates CO 2 gas, increases the amount of oxygen in the weld metal, and affects the cryogenic toughness. Effect. Accordingly, a melt type flux is preferably used.
- composition of the flux used in the present invention is as follows.
- SiO 2 0 to 35%
- SiO 2 is an acidic component, and is a component that adjusts the viscosity and melting point of the molten slag.
- the viscosity and melting point can be adjusted with other components, and SiO 2 may not be contained.
- the amount of SiO 2 exceeds 35%, the viscosity of the molten slag increases and poor penetration occurs, so the amount of SiO 2 is preferably 35% or less, more preferably 30% or less.
- CaO 5-60% CaO is a basic component, is an effective component for adjusting the viscosity and melting point of molten slag, and has a high effect of reducing the oxygen content of the weld metal.
- the amount of CaO is less than 5%, the amount of oxygen in the weld metal increases, so the amount of CaO is preferably 5% or more, and more preferably 10% or more.
- the amount of CaO exceeds 60%, undercutting and slag entrainment occur, so the amount of CaO is preferably 60% or less, and more preferably 55% or less.
- CaF 2 3 to 50% CaF 2 is also a basic component, and is an effective component for adjusting the viscosity and melting point of the molten slag, and has a high effect of reducing the oxygen content of the weld metal.
- the amount of CaF 2 is less than 3%, the amount of oxygen in the weld metal increases, so the amount of CaF 2 is preferably 3% or more, and more preferably 5% or more.
- the amount of CaF 2 is preferably 50% or less. % Or less is more preferable.
- BaF 2 0 to 20%
- BaF 2 is also a basic component, and is an effective component for adjusting the viscosity and melting point of the molten slag and has a high effect of reducing the oxygen content of the weld metal.
- the amount of BaF 2 is preferably 20% or less, and more preferably 15% or less.
- MgO 0-20% MgO is also a basic component and is an effective component for adjusting the viscosity and melting point of molten slag.
- the viscosity and melting point can be adjusted with other components, and MgO may not be contained.
- the MgO amount is preferably 20% or less, 15% The following is more preferable.
- Al 2 O 3 0 to 65%
- Al 2 O 3 is an effective component for adjusting the viscosity and melting point of the molten slag.
- the viscosity and melting point can be adjusted with other components, and Al 2 O 3 may not be contained.
- the amount of Al 2 O 3 exceeds 65%, the viscosity of the molten slag increases and poor penetration occurs. Therefore, it is preferably 65% or less, more preferably 60% or less.
- the amount of Al 2 O 3 is preferably 3% or more.
- MnO 0-20% MnO is an effective component for adjusting the viscosity and melting point of molten slag.
- the viscosity and melting point can be adjusted with other components, and MnO may not be contained.
- the amount of MnO exceeds 20%, the melting point of the molten slag becomes too low and the viscosity becomes insufficient, and the molten slag is easily discharged from between the sliding copper plating and the weld metal. After that, the molten metal with molten slag becomes ineffective and the metal melts down.
- the amount of MnO is preferably 20% or less, and more preferably 15% or less.
- TiO 2 : 0 to 10% and ZrO 2 : 0 to 10% TiO 2 and ZrO 2 are effective components for adjusting the melting point of the molten slag.
- the melting point can be adjusted with other components, and TiO 2 and ZrO 2 do not have to be included.
- TiO 2 and ZrO 2 exceed 10%, the viscosity increases rapidly in the vicinity of the melting point, so that slag entrainment tends to occur. Therefore, the amount of TiO 2 and ZrO 2 is preferably 10% or less, and more preferably 5% or less.
- FeO 0-5% FeO is an effective component for adjusting the viscosity and melting point of molten slag and has a high effect of reducing the oxygen content of the weld metal.
- the viscosity and melting point can be adjusted with other components, and FeO may not be contained.
- the amount of FeO exceeds 5%, slag is generated on the bead surface and seizure tends to occur, so that it is preferably 5% or less, more preferably 3% or less.
- Na 2 O 0 to 10% Na 2 O is a very effective component for adjusting the viscosity of the molten slag.
- the viscosity and melting point can be adjusted with other components, and Na 2 O may not be contained.
- the amount of Na 2 O exceeds 10%, the melting point of the molten slag becomes too low and the viscosity becomes insufficient, and the molten slag is discharged from between the sliding copper plating and the weld metal. Since it becomes too easy and the suppression of the molten metal by the molten slag becomes ineffective, it falls off and is preferably 10% or less, more preferably 7% or less.
- K 2 O 0 to 10%
- K 2 O is a very effective component for adjusting the viscosity of the molten slag.
- the viscosity and melting point can be adjusted with other components, and K 2 O may not be contained.
- the K 2 O amount exceeds 10%, the melting point of the molten slag becomes too low and the viscosity becomes insufficient, and the molten slag is discharged from between the sliding copper plating and the weld metal. It becomes too easy and the molten metal by molten slag can no longer be controlled and melts down.
- the amount of K 2 O is preferably 10% or less, and more preferably 7% or less.
- BaO is a basic component, is an effective component for adjusting the viscosity and melting point of molten slag, and has a high effect of reducing the oxygen content of the weld metal.
- the viscosity and melting point can be adjusted with other components, and BaO may not be contained.
- the BaO content exceeds 20%, the melting point of the molten slag becomes too low and the viscosity becomes insufficient, and the molten slag is easily discharged from between the sliding copper plating and the weld metal. After that, the molten metal with molten slag becomes ineffective and the metal melts down.
- the BaO amount is preferably 20% or less, and more preferably 15% or less.
- composition of the flux is effective in reducing the oxygen content of the weld metal and leads to an improvement in the toughness of the weld metal part. Therefore, it is preferable to satisfy the expression (5) within the limited range of each component amount.
- CaO in formula (5) representation of the components such as CaF 2 are the respective content per flux total mass (mass%).
- composition of the flux according to the present invention is as described above, and the balance is inevitable impurities such as P, S, As, Sb, Sn, and Bi.
- the welded joint of the present invention is produced by electroslag welding using the above electroslag welding wire and flux.
- the composition (the amount of each component) of the weld metal in the welded joint is the same as the composition of the wire for electroslag welding except that the balance is Fe and inevitable impurities, and the effect of each component is also the same. . Therefore, in the following description, the effect of the component which overlaps with the electrogas welding wire mentioned above is abbreviate
- Si more than 0%, 0.50% or less Preferred upper limit: 0.40%, more preferably 0.30%
- Mn more than 0%, 1.0% or less Preferred upper limit: 0.8%
- Ni 6.0 to 15.0%, Preferred lower limit: 7.0%, Preferred upper limit: 14.0%, more preferably 12.0%
- the weld metal in the said weld joint satisfies following formula (6).
- C, Si, etc. in Formula (6) are each content (mass%) per weld metal total mass, the unit is abbreviate
- the inventors found the technical significance of satisfying the formula (6) in the weld metal from the same viewpoint as the formula (1) in the wire.
- the parameter of Expression (6) is preferably 0.160 or more, and more preferably 0.170 or more.
- the parameter of the formula (6) exceeds 0.300, the strength of the weld metal becomes excessive, and the cryogenic toughness decreases. 0.290 or less is preferable and the parameter of Formula (6) has more preferable 0.280 or less.
- the weld metal in the weld joint further contains at least one element selected from the group consisting of Cu, Cr, Mo, W, Nb, V, and B
- the following formula (7) is satisfied.
- C, Si, etc. in Formula (7) are each content (mass%) per weld metal total mass, the unit is abbreviate
- Cu, Cr, Mo, W, Nb, V, and B are elements that contribute to securing the strength.
- the parameter of the formula (7) is preferably 0.160 or more, and more preferably 0.170 or more.
- the parameter of the formula (7) exceeds 0.300, the strength of the weld metal becomes excessive, and the cryogenic toughness decreases. 0.290 or less is preferable and the parameter of Formula (7) has more preferable 0.280 or less.
- each preferable content of Cu, Cr, Mo, W, Nb, V, and B in a weld metal is the same as the preferable content in the said wire.
- O 0% or more and 0.025% or less O forms an oxide, and the oxide acts as a starting point of void formation during the Charpy test, so that the cryogenic toughness is lowered. Therefore, the amount of O is preferably 0.025% or less, and is not desirably contained.
- N 0% or more, 0.010% or less N strengthens the matrix of the weld metal part as a solid solution element, but also an element that induces brittle fracture, and the cryogenic toughness decreases. Therefore, the N content is preferably 0.010% or less, and is not desirably contained.
- the basic composition of the weld metal according to the present invention is as described above, and the balance is added from iron and wire, Cu, Cr, Mo, W, Nb, V, B, and Ca, Mg added as a deoxidizer.
- REM, Al, Zr, and Ti are not discharged as slag but remain in the weld metal, and are inevitable impurities. Examples of unavoidable impurities include P, S, As, Sb, Sn, Bi, and the like.
- Ni is preferably 5.2% or more, and still more preferably 6.5% or more. However, if the Ni content exceeds 10%, the steel material cost increases, so the Ni content is preferably 10% or less. The amount of Ni is more preferably 9.5% or less.
- a steel plate having the composition shown in Table 1 as the base material (the balance being inevitable impurities), an electroslag welding wire having the composition shown in Tables 2 to 5, and a flux having the composition shown in Table 6 A weld metal was produced under the following welding conditions.
- Tables 1 to 6 and Tables 7 to 10 shown below the amount of each component is expressed in mass%, and the notation “0” in each component composition means that it is less than the detection limit value in the composition analysis. .
- the slag amounts shown in Tables 2 to 5 are amounts of slag forming agents contained in the wire, and the values calculated from the composition by the formula (4) are described.
- the tested wires include flux-cored wires, MCW, and solid wires.
- the MCW and solid wires are shown in the remarks column, and the flux-cored wires are blank.
- the presence or absence of Cu plating is shown in the remarks column.
- the Cu plating amount is in the range of 0.10 to 0.30%
- the wire Cu amounts in Tables 2 to 5 indicate the sum of the Cu plating amount and the amount contained in the wire as an alloy in addition to the plating.
- Equation (1) the parameter value of Equation (1)
- Equation (2 ) Parameter value is blank.
- the wire containing at least one element selected from the group consisting of Cu, Cr, Mo, W, Nb, V, and B only the parameter value of the formula (2) is described, and the formula (1) The parameter value is blank.
- the width of the groove surrounded by the copper plating 1 (the back side of the groove) and the sliding copper plating 2 (the front side of the groove) is 10 mm, and the opening is 20 ° V. Pre-welding was performed.
- the copper plating 1 and the sliding copper plating 2 both used what was water-cooled.
- Tables 7 to 10 show the compositions of the weld metal thus obtained (the balance is inevitable impurities).
- the weld metals shown in Tables 7 to 10 for the weld metal not containing any of Cu, Cr, Mo, W, Nb, V, and B, only the parameter value of the formula (6) is described.
- the parameter value in equation (7) is blank.
- the weld metal containing at least one element selected from the group consisting of Cu, Cr, Mo, W, Nb, V, and B only the parameter value of formula (7) is described, and formula (6)
- the parameter value is left blank.
- the following characteristics were evaluated about the said weld metal.
- Nos. 1 to 90 are Nos. In Tables 2 to 5 that satisfy the requirements of the present invention. This is an example using 1 to 90 wires, and is excellent in both cryogenic toughness IV (absorbed energy) and strength TS (tensile strength) despite being subjected to high heat input welding of 10.0 kJ / mm or more. A weld metal was obtained.
- No. No. 91 had a large amount of C in the wire and weld metal, and toughness deteriorated.
- No. No. 92 had a large amount of Si in the wire and weld metal, and toughness deteriorated.
- No. No. 93 had a large amount of Mn in the wire and weld metal, and toughness deteriorated.
- No. 94 the amount of Ni in the wire and weld metal was small, the strength decreased, and the toughness deteriorated.
- No. No. 95 had a large amount of Ni in the wire and weld metal, and toughness deteriorated.
Abstract
Description
C :0%超、0.07%以下、
Si:0%超、0.50%以下、
Mn:0%超、1.0%以下、
Ni:6.0~15.0%、
Fe:79%以上
を含有し、
かつ、下記式(1)を満足することを特徴とする、エレクトロスラグ溶接用ワイヤである。
0.150≦C+Si/30+Mn/20+Ni/60≦0.300 (1)
質量%で、
C :0%超、0.07%以下、
Si:0%超、0.50%以下、
Mn:0%超、1.0%以下、
Ni:6.0~15.0%、
Fe:79%以上
を含有し、かつ、
Cu、Cr、Mo、W、Nb、V、およびBからなる群より選ばれる少なくとも一種の元素を含有し、
かつ、下記式(2)を満足することを特徴とする、エレクトロスラグ溶接用ワイヤである。
0.150≦C+Si/30+W/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+Nb/10+V/10+5×B≦0.300 (2)
かつ、下記式(3)を満足することを特徴とする。
0.001≦1.6(Ca+Mg)+1.25(REM+Zr)+Al+0.8Ti≦0.70 (3)
(CaO+CaF2+BaF2+MgO+BaO+Na2O+K2O)/(SiO2+0.5(Al2O3+TiO2+ZrO2+MnO+FeO))≧1.00 (4)
(但し、SiO2、Al2O3、TiO2、ZrO2、MnO、およびFeOのいずれも含まない場合は>100とする。)
SiO2:0~35%、
CaO:5~60%、
CaF2:3~50%、
BaF2:0~20%、
MgO:0~20%、
Al2O3:0~65%、
MnO:0~20%、
TiO2:0~10%、
ZrO2:0~10%、
FeO:0~5%、
Na2O:0~10%、
K2O:0~10%、
BaO:0~20%、
を含有し、
かつ、下記式(5)を満足することを特徴とする、エレクトロスラグ溶接用フラックスである。
(CaO+CaF2+BaF2+MgO+BaO+Na2O+K2O)/(SiO2+0.5(Al2O3+TiO2+ZrO2+MnO+FeO))≧1.00 (5)
(但し、SiO2、Al2O3、TiO2、ZrO2、MnO、およびFeOのいずれも含まない場合は>100とする。)
前記溶接継手における溶接金属が、質量%で、
C :0%超、0.07%以下、
Si:0%超、0.50%以下、
Mn:0%超、1.0%以下、
Ni:6.0~15.0%、
を含有し、残部がFeおよび不可避的不純物からなり、
かつ、下記式(6)を満足することを特徴とする、溶接継手である。
0.150≦C+Si/30+Mn/20+Ni/60≦0.300 (6)
前記溶接継手における溶接金属が、質量%で、
C :0%超、0.07%以下、
Si:0%超、0.50%以下、
Mn:0%超、1.0%以下、
Ni:6.0~15.0%、
を含有し、かつ
Cu、Cr、Mo、W、Nb、V、およびBからなる群より選ばれる少なくとも一種の元素を含有し、残部がFeおよび不可避的不純物からなり、
かつ、下記式(7)の範囲を満足することを特徴とする、溶接継手である。
0.150≦C+Si/30+W/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+Nb/10+V/10+5×B≦0.300 (7)
O:0%以上、0.025%以下
N:0%以上、0.010%以下
をさらに含有することを特徴とする。
本発明に係るエレクトロスラグ溶接用ワイヤの成分は以下のとおりである。なお、本発明では、後述するようにフラックス入りワイヤが好ましく用いられるが、その場合におけるエレクトロスラグ溶接用ワイヤの成分は、フラックス入りワイヤに含まれる各成分の質量%を当該フラックス入りワイヤの全質量に対する割合で規定したものである。なお、フラックス入りワイヤの全質量とはフープとフラックスとの全質量を合わせたものをいう。
Cは、固溶強化および化合物を形成して強度確保に寄与する元素である。上記作用を有効に発揮させるため、C量は0.003%以上であることが好ましい。但し、C量を過剰に添加すると化合物粒子数の増加を招き、当該化合物粒子がシャルピー試験時のボイド形成の起点として作用して極低温靭性が低下するため、C量を0.07%以下とする。C量は、0.05%以下であることが好ましい。
Siは脱酸元素であり、溶接金属中の酸素濃度を低下させることで極低温靭性の向上作用を有する。上記作用を有効に発揮させるため、Si量は0.003%以上であることが好ましい。但し、Siの過剰添加は強度の過大な上昇を招き、極低温靭性が低下するため、Si量を0.50%以下とする。Si量は、0.40%以下であることが好ましい。
Mnは、固溶強化により強度確保に寄与する元素である。Mn量が不足すると、所定の強度が得られないため、Mn量は0.01%以上であることが好ましい。但し、Mnの過剰添加は強度の過大な上昇を招き、極低温靭性が低下するため、Mn量を1.0%以下とする。Mn量は、0.9%以下であることが好ましい。
Niは、低温靭性の確保に必須の元素であり、Ni量を6.0%以上とする。Ni量は7.0%以上であることが好ましい。但し、Niの過剰添加は強度の上昇を招き、極低温靭性が低下するため、Ni量を15.0%以下とする。Ni量は、14.0%以下であることが好ましい。
Feは対象母材と同様、基本成分であり、母材と溶接金属とからなる継手の成分的連続性を確保するため、79%以上とする。79%未満の場合、他の合金成分あるいはスラグ形成剤を規定以上添加する必要が生じ、結果として溶接金属の強度が過大となり、極低温靭性が低下する。Fe量は、82%以上であることが好ましい。
0.150≦C+Si/30+Mn/20+Ni/60≦0.300 (1)
式(1)のパラメータが0.150未満の場合、所定の強度が得られない。式(1)のパラメータは、0.160以上が好ましく、0.170以上がより好ましい。一方、式(1)のパラメータが0.300を超えると溶接金属の強度が過大となり、極低温靭性が低下する。式(1)のパラメータは、0.290以下が好ましく、0.280以下がより好ましい。
0.150≦C+Si/30+W/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+Nb/10+V/10+5×B≦0.300 (2)
Cu、Cr、Mo、W、Nb、V、およびBは強度確保に寄与する元素である。式(2)のパラメータが0.150未満の場合、所定の強度が得られない。式(2)のパラメータは、0.160以上が好ましく、0.170以上がより好ましい。一方、式(2)のパラメータが0.300を超えると溶接金属の強度が過大となり、極低温靭性が低下する。式(2)のパラメータは、0.290以下が好ましく、0.280以下がより好ましい。
より好ましい範囲
Cu:0.45%以下
Cr:0.50%以下
Mo:0.55%以下
W :0.50%以下
Nb:0.20%以下
V :0.20%以下
B :0.01%以下
0.001≦1.6(Ca+Mg)+1.25(REM+Zr)+Al+0.8Ti≦0.70 (3)
を満足することが好ましい。
より好ましい範囲
Ca:0.0005~0.20%
Mg:0.0005~0.20%
REM:0.001~0.20%
Zr:0.001~0.15%
Al:0.001~0.20%
Ti:0.001~0.10%
(CaO+CaF2+BaF2+MgO+BaO+Na2O+K2O)/(SiO2+0.5(Al2O3+TiO2+ZrO2+MnO+FeO))≧1.00 (4)
(但し、SiO2、Al2O3、TiO2、ZrO2、MnO、およびFeOのいずれも含まない場合は>100とする。)
エレクトロスラグ溶接では、溶接が進むにつれて減少する溶融スラグを補うためにフラックスが追加投入されるが、このフラックスを本明細書では単にフラックスという。エレクトロスラグ溶接では、溶接が進行するにつれて溶融金属は冷却されて溶接金属となり、溶融スラグ浴の一部は溶融スラグ層となるが、溶接の進行につれて溶融スラグ層が冷却されて固化スラグとなり、溶融スラグが消費される。この溶融スラグ浴の減少を補うため、フラックスが用いられる。フラックスは、溶融型フラックスとボンド型(焼成型)フラックスとに大別される。溶融型フラックスは、種々の原料を電気炉などで溶解し、粉砕することにより製造される。一方、焼成型フラックスは、種々の原料をケイ酸アルカリなどのバインダーにより結合し、造粒した後、焼成することにより製造される。焼成型フラックスは前述の炭酸塩を原料として用いる場合があるが、溶接時に炭酸塩が熱により分解し、CO2ガスを発生し、溶接金属中の酸素量が増加し、極低温靭性に影響を及ぼす。従って、好ましくは溶融型フラックスを用いる。
SiO2は酸性成分であり、溶融スラグの粘性および融点を調整する成分である。本発明では、他成分で粘性および融点の調整が可能であり、SiO2を含まなくてもよい。一方、含有する場合は、SiO2量が35%を超えると、溶融スラグの粘性が高くなり、溶込み不良が生じるため、SiO2量は35%以下が好ましく、30%以下がより好ましい。
CaOは塩基性成分であり、溶融スラグの粘性および融点を調節するために有効な成分であると共に、溶接金属の酸素量を低減させる効果が高い。CaO量が5%未満の場合、溶接金属の酸素量が増加するため、CaO量は5%以上であることが好ましく、10%以上がより好ましい。但し、CaO量が60%を超えると、アンダーカットおよびスラグ巻き込みが発生するため、CaO量は60%以下が好ましく、55%以下がより好ましい。
CaF2も塩基性成分であり、溶融スラグの粘性および融点を調節するために有効な成分であると共に、溶接金属の酸素量を低減させる効果が高い。CaF2量が3%未満の場合、溶接金属の酸素量が増加するため、CaF2量は3%以上が好ましく、5%以上がより好ましい。但し、CaF2量が50%を超えると、アンダーカットおよびスラグ巻き込みが発生し易くなると共に、溶接時にフッ化ガスが発生して溶接が安定しないため、CaF2量は50%以下が好ましく、45%以下がより好ましい。
BaF2も塩基性成分であり、溶融スラグの粘性および融点を調節するために有効な成分であると共に、溶接金属の酸素量を低減させる効果が高い。本発明では、他成分で粘性および融点、さらには溶接金属酸素量の調整が可能であり、BaF2を含まなくてもよい。一方、含有する場合は、BaF2量が20%を超えると溶融スラグの融点が低くなり過ぎて粘性が不足し、摺動式銅当て金と溶接金属との間から溶融スラグが排出しやすくなり過ぎ、溶融スラグによる溶融金属の抑えが効かなくなり溶落する。このため、BaF2量は20%以下が好ましく、15%以下がより好ましい。
MgOも塩基性成分であり、溶融スラグの粘性および融点を調整するために有効な成分である。本発明では、他成分で粘性および融点の調整が可能であり、MgOを含まなくてもよい。一方、含有する場合は、MgO量が20%を超えると溶融スラグの融点が高くなり過ぎ粘性も高くなる結果、溶込み不良が生じるため、MgO量は20%以下であることが好ましく、15%以下がより好ましい。
Al2O3は溶融スラグの粘性および融点を調整するために有効な成分である。本発明では、他成分で粘性および融点の調整が可能であり、Al2O3を含まなくてもよい。一方、含有する場合は、Al2O3量が65%を超えると溶融スラグの粘性が高くなり、溶込み不良が生じるため、65%以下であることが好ましく、60%以下がより好ましい。
また、Al2O3量は、3%以上が好ましい。
MnOは、溶融スラグの粘性および融点を調整するために有効な成分である。本発明では、他成分で粘性および融点の調整が可能であり、MnOを含まなくてもよい。一方、含有する場合は、MnO量が20%を超えると、溶融スラグの融点が低くなり過ぎて粘性が不足し、摺動式銅当て金と溶接金属との間から溶融スラグが排出しやすくなり過ぎ、溶融スラグによる溶融金属の抑えが効かなくなり溶落する。このため、MnO量は20%以下が好ましく、15%以下がより好ましい。
TiO2およびZrO2は、溶融スラグの融点を調整するために有効な成分である。本発明では、他成分で融点の調整が可能であり、TiO2およびZrO2を含まなくてもよい。一方、含有する場合、TiO2およびZrO2がそれぞれ10%を超えると、融点付近で粘度が急激に高くなるため、スラグ巻込みが発生しやすくなる。そのため、TiO2およびZrO2量はそれぞれ10%以下が好ましく、5%以下がより好ましい。
FeOは、溶融スラグの粘性および融点を調整するために有効な成分であると共に、溶接金属の酸素量を低減させる効果が高い。本発明では、他成分で粘性および融点の調整が可能であり、FeOを含まなくてもよい。一方、含有する場合は、FeO量が5%を超えると、ビード表面にスラグが生成して焼付きやすくなるため、5%以下が好ましく、3%以下がより好ましい。
Na2Oは、溶融スラグの粘性を調整するために非常に有効な成分である。ただし、本発明では、他成分で粘性および融点の調整が可能であり、Na2Oを含まなくてもよい。一方、含有する場合は、Na2O量が10%を超えると、溶融スラグの融点が低くなり過ぎて粘性が不足し、摺動式銅当て金と溶接金属との間から溶融スラグが排出しやすくなり過ぎ、溶融スラグによる溶融金属の抑えが効かなくなり溶落するため、10%以下が好ましく、より好ましくは7%以下である。
K2Oは、溶融スラグの粘性を調整するために非常に有効な成分である。ただし、本発明では、他成分で粘性および融点の調整が可能であり、K2Oを含まなくてもよい。一方、含有する場合は、K2O量が10%を超えると、溶融スラグの融点が低くなり過ぎて粘性が不足し、摺動式銅当て金と溶接金属との間から溶融スラグが排出しやすくなり過ぎ、溶融スラグによる溶融金属の抑えが効かなくなり溶落する。このため、K2O量は、10%以下が好ましく、7%以下がより好ましい。
BaOは、塩基性成分であり、溶融スラグの粘性および融点を調節するために有効な成分であると共に、溶接金属の酸素量を低減させる効果が高い。ただし、本発明では、他成分で粘性および融点の調整が可能であり、BaOを含まなくてもよい。一方、含有する場合は、BaO量が20%を超えると、溶融スラグの融点が低くなり過ぎて粘性が不足し、摺動式銅当て金と溶接金属との間から溶融スラグが排出しやすくなり過ぎ、溶融スラグによる溶融金属の抑えが効かなくなり溶落する。このため、BaO量は、20%以下が好ましく、15%以下がより好ましい。
(CaO+CaF2+BaF2+MgO+BaO+Na2O+K2O)/(SiO2+0.5(Al2O3+TiO2+ZrO2+MnO+FeO))≧1.00 (5)
(但し、SiO2、Al2O3、TiO2、ZrO2、MnO、およびFeOのいずれも含まない場合は>100とする。)
本発明の溶接継手は、上記エレクトロスラグ溶接用ワイヤおよびフラックスを用い、エレクトロスラグ溶接により作製される。上記溶接継手における溶接金属の組成(各成分量)は、残部がFeおよび不可避的不純物である点を除き、エレクトロスラグ溶接用ワイヤの組成と同じであって、各成分の作用効果も同一である。したがって、以下の記載において、前述したエレクトロガス溶接用ワイヤと重複する成分の作用効果は、説明の重複を避けるため省略して、好ましい範囲のみ記載する。
好ましい上限:0.06%
好ましい上限:0.40%、より好ましくは0.30%
好ましい上限:0.8%
好ましい下限:7.0%、
好ましい上限:14.0%、より好ましくは12.0%
0.150≦C+Si/30+Mn/20+Ni/60≦0.300 (6)
発明者らは、上記ワイヤにおける式(1)と同様の観点から、溶接金属において式(6)を満たすことの技術的意義を見出した。式(6)のパラメータが0.150未満の場合、所定の強度が得られない。式(6)のパラメータは、0.160以上が好ましく、0.170以上がより好ましい。一方、式(6)のパラメータが0.300を超えると溶接金属の強度が過大となり、極低温靭性が低下する。式(6)のパラメータは、0.290以下が好ましく、0.280以下がより好ましい。
0.150≦C+Si/30+W/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+Nb/10+V/10+5×B≦0.300 (7)
Cu、Cr、Mo、W、Nb、V、およびBは強度確保に寄与する元素である。発明者らは、上記ワイヤにおける式(2)と同様の観点から、溶接金属において式(7)を満たすことの技術的意義を見出した。式(7)のパラメータが0.150未満の場合、所定の強度が得られない。式(7)のパラメータは、0.160以上が好ましく、0.170以上がより好ましい。一方、式(7)のパラメータが0.300を超えると溶接金属の強度が過大となり、極低温靭性が低下する。式(7)のパラメータは、0.290以下が好ましく、0.280以下がより好ましい。
なお、溶接金属中におけるCu、Cr、Mo、W、Nb、V、およびBのそれぞれの好ましい含有量は、上記ワイヤにおける好ましい含有量と同じである。
Oは酸化物を形成し、当該酸化物がシャルピー試験時のボイド形成の起点として作用するため、極低温靭性が低下する。したがって、O量は、0.025%以下とすることが好ましく、望ましくは含有しない。
Nは固溶元素として溶接金属部のマトリックスを強化する一方、脆性破壊を誘発する元素でもあり、極低温靭性が低下する。したがって、N量は、0.010%以下とすることが好ましく、望ましくは含有しない。
また、表2~5に示す各ワイヤにおいて、Cu、Cr、Mo、W、Nb、V、およびBのいずれも含有しないワイヤについては、式(1)のパラメータ値のみを記載し、式(2)のパラメータ値は空欄としている。一方、Cu、Cr、Mo、W、Nb、V、およびBからなる群より選ばれる少なくとも一種の元素を含有するワイヤについては、式(2)のパラメータ値のみを記載し、式(1)のパラメータ値は空欄としている。
溶接条件:
母材の板厚:30mm
開先形状:図1を参照
スラグ浴深さ25mmで溶接を開始
ワイヤ:表2~5を参照
ワイヤ径=1.6mm
入熱条件:約12~19kJ/mm(溶接電流340~380A-溶接電圧40~44V)
溶接姿勢:立向き1パス
溶接金属の中央部より、溶接線方向に平行にJIS Z2202記載の方法で引張試験片を採取して、JIS Z2241に記載の方法で引張り試験を行った。本実施例では、引張強度TS>690MPaの溶接金属を合格とした。
得られた溶接金属の板厚中央部より、溶接線方向に垂直にシャルピー衝撃試験片(JIS Z3111 4号Vノッチ試験片)を採取し、JIS Z 2242に記載の方法で-196℃でのシャルピー衝撃試験を実施した。同様の試験を3回行い、その平均値を算出したとき、吸収エネルギーIVが40J以上の溶接金属を極低温靭性に優れると評価した。
ビード外観は目視にて行い、下記基準で評価した。
合格:ビードの際が揃って直線性に優れているもの
不合格:ビードが大きく蛇行しているもの、またはアンダーカットが発生したもの
No.92は、ワイヤおよび溶接金属中のSi量が多く、靭性が劣化した。
No.93は、ワイヤおよび溶接金属中のMn量が多く、靭性が劣化した。
No.94は、ワイヤおよび溶接金属中のNi量が少なく、強度が低下したうえ、靭性が劣化した。
No.95は、ワイヤおよび溶接金属中のNi量が多く、靭性が劣化した。
No.96は、ワイヤのFe量が少なくなった結果、合金成分が過大となり、溶接金属の式(6)のパラメータが大きく、靭性が劣化した。
No.97は、ワイヤの式(1)のパラメータが小さく、強度が低下した上、靭性が劣化した。
No.98は、ワイヤの式(1)のパラメータおよび溶接金属の式(6)のパラメータが大きく、靭性が劣化した。
No.99は、ワイヤの式(2)のパラメータが小さく、強度が低下した上、靭性が劣化した。
No.100は、ワイヤの式(2)のパラメータおよび溶接金属の式(7)のパラメータが大きく、靭性が劣化した。
なお、本出願は、2016年9月13日付けで出願された日本特許出願(特願2016-178802)及び2017年2月21日付けで出願された日本特許出願(特願2017-030282)に基づいており、その全体が引用により援用される。
Claims (13)
- ワイヤ全質量あたり、
質量%で、
C :0%超、0.07%以下、
Si:0%超、0.50%以下、
Mn:0%超、1.0%以下、
Ni:6.0~15.0%、
Fe:79%以上
を含有し、
かつ、下記式(1)を満足することを特徴とする、エレクトロスラグ溶接用ワイヤ。
0.150≦C+Si/30+Mn/20+Ni/60≦0.300 (1) - ワイヤ全質量あたり、
質量%で、
C :0%超、0.07%以下、
Si:0%超、0.50%以下、
Mn:0%超、1.0%以下、
Ni:6.0~15.0%、
Fe:79%以上
を含有し、かつ、
Cu、Cr、Mo、W、Nb、V、およびBからなる群より選ばれる少なくとも一種の元素を含有し、
かつ、下記式(2)を満足することを特徴とする、エレクトロスラグ溶接用ワイヤ。
0.150≦C+Si/30+W/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+Nb/10+V/10+5×B≦0.300 (2) - Ca、Mg、REM、Zr、Al、およびTiからなる群より選ばれる少なくとも一種の元素をさらに含有し、
かつ、下記式(3)を満足することを特徴とする、請求項1または2に記載のエレクトロスラグ溶接用ワイヤ。
0.001≦1.6(Ca+Mg)+1.25(REM+Zr)+Al+0.8Ti≦0.70 (3) - 前記ワイヤは、ソリッドワイヤまたはフラックス入りワイヤであることを特徴とする、請求項1または2に記載のエレクトロスラグ溶接用ワイヤ。
- 前記ワイヤは、ワイヤ全質量に対し、スラグ形成剤を0%超、15%以下含み、かつ前記スラグ形成剤は、SiO2、CaO、CaF2、BaF2、MgO、Al2O3、MnO、TiO2、ZrO2、FeO、Na2O、K2O、およびBaOからなる群より選ばれる少なくとも一種の元素を含有し、
かつ、下記式(4)を満足することを特徴とするフラックス入りワイヤである、請求項1または2に記載のエレクトロスラグ溶接用ワイヤ。
(CaO+CaF2+BaF2+MgO+BaO+Na2O+K2O)/(SiO2+0.5(Al2O3+TiO2+ZrO2+MnO+FeO))≧1.00 (4)
(但し、SiO2、Al2O3、TiO2、ZrO2、MnO、およびFeOのいずれも含まない場合は>100とする。) - 前記ワイヤにCuめっきが施されたことを特徴とする、請求項1または2に記載のエレクトロスラグ溶接用ワイヤ。
- 請求項1または2に記載のエレクトロスラグ溶接用ワイヤと共にエレクトロスラグ溶接に用いられるフラックスであって、
前記フラックスは、質量%で、
SiO2:0~35%、
CaO:5~60%、
CaF2:3~50%、
BaF2:0~20%、
MgO:0~20%、
Al2O3:0~65%、
MnO:0~20%、
TiO2:0~10%、
ZrO2:0~10%、
FeO:0~5%、
Na2O:0~10%、
K2O:0~10%、
BaO:0~20%、
を含有し、
かつ、下記式(5)を満足することを特徴とする、エレクトロスラグ溶接用フラックス。
(CaO+CaF2+BaF2+MgO+BaO+Na2O+K2O)/(SiO2+0.5(Al2O3+TiO2+ZrO2+MnO+FeO))≧1.00 (5)
(但し、SiO2、Al2O3、TiO2、ZrO2、MnO、およびFeOのいずれも含まない場合は>100とする。) - 請求項1または2に記載のエレクトロスラグ溶接用ワイヤ、および請求項7に記載のエレクトロスラグ溶接用フラックスを用い、エレクトロスラグ溶接により作製される溶接継手であって、
前記溶接継手における溶接金属が、質量%で、
C :0%超、0.07%以下、
Si:0%超、0.50%以下、
Mn:0%超、1.0%以下、
Ni:6.0~15.0%、
を含有し、残部がFeおよび不可避的不純物からなり、
かつ、下記式(6)を満足することを特徴とする、溶接継手。
0.150≦C+Si/30+Mn/20+Ni/60≦0.300 (6) - 請求項1または2に記載のエレクトロスラグ溶接用ワイヤ、および請求項7に記載のエレクトロスラグ溶接用フラックスを用い、エレクトロスラグ溶接により作製される溶接継手であって、
前記溶接継手における溶接金属が、質量%で、
C :0%超、0.07%以下、
Si:0%超、0.50%以下、
Mn:0%超、1.0%以下、
Ni:6.0~15.0%、
を含有し、かつ
Cu、Cr、Mo、W、Nb、V、およびBからなる群より選ばれる少なくとも一種の元素を含有し、残部がFeおよび不可避的不純物からなり、
かつ、下記式(7)の範囲を満足することを特徴とする、溶接継手。
0.150≦C+Si/30+W/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+Nb/10+V/10+5×B≦0.300 (7) - 前記溶接金属は、質量%で
O:0%以上、0.025%以下
N:0%以上、0.010%以下
をさらに含有することを特徴とする、請求項8に記載の溶接継手。 - 前記溶接金属は、質量%で
O:0%以上、0.025%以下
N:0%以上、0.010%以下
をさらに含有することを特徴とする、請求項9に記載の溶接継手。 - 母材として5~10%のNiを含有する鋼板を用いることを特徴とする、請求項8に記載の溶接継手。
- 母材として5~10%のNiを含有する鋼板を用いることを特徴とする、請求項9に記載の溶接継手。
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CA3035652A CA3035652C (en) | 2016-09-13 | 2017-09-04 | Wire for electroslag welding, flux for electroslag welding and welded joint |
ES17850726T ES2904627T3 (es) | 2016-09-13 | 2017-09-04 | Alambre para soldadura por electroescoria, fundente para soldadura por electroescoria y junta soldada |
KR1020197007096A KR102208029B1 (ko) | 2016-09-13 | 2017-09-04 | 일렉트로슬래그 용접용 와이어, 일렉트로슬래그 용접용 플럭스 및 용접 이음 |
US16/332,308 US11577346B2 (en) | 2016-09-13 | 2017-09-04 | Wire for electroslag welding, flux for electroslag welding and welded joint |
EP17850726.5A EP3513901B1 (en) | 2016-09-13 | 2017-09-04 | Wire for electroslag welding, flux for electroslag welding and welded joint |
CN201780055668.8A CN109789519B (zh) | 2016-09-13 | 2017-09-04 | 电渣焊用焊丝、电渣焊用焊剂和焊接接头 |
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JP2022121316A (ja) * | 2021-02-08 | 2022-08-19 | 株式会社神戸製鋼所 | ガスシールドアーク溶接用フラックス入りワイヤ |
CN115026388B (zh) * | 2022-06-27 | 2023-12-26 | 张家港荣盛特钢有限公司 | 高过渡系数的超大线能量双丝气电立焊方法 |
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EP3513901B1 (en) | 2022-01-12 |
ES2904627T3 (es) | 2022-04-05 |
EP3513901A1 (en) | 2019-07-24 |
EP3513901A4 (en) | 2020-04-22 |
CN109789519A (zh) | 2019-05-21 |
CN109789519B (zh) | 2022-06-07 |
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