WO2009145347A1 - 凝固結晶粒を微細にする二相ステンレス鋼溶接用フラックス入りワイヤ - Google Patents
凝固結晶粒を微細にする二相ステンレス鋼溶接用フラックス入りワイヤ Download PDFInfo
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- WO2009145347A1 WO2009145347A1 PCT/JP2009/060100 JP2009060100W WO2009145347A1 WO 2009145347 A1 WO2009145347 A1 WO 2009145347A1 JP 2009060100 W JP2009060100 W JP 2009060100W WO 2009145347 A1 WO2009145347 A1 WO 2009145347A1
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- 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
- B23K35/3601—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 with inorganic compounds as principal constituents
- B23K35/3602—Carbonates, basic oxides or hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
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- 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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
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- 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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
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- 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
- B23K35/3601—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 with inorganic compounds as principal constituents
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
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- 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
- B23K35/3601—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 with inorganic compounds as principal constituents
- B23K35/3607—Silica or silicates
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- 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
- B23K35/3601—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 with inorganic compounds as principal constituents
- B23K35/3608—Titania or titanates
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- 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
- B23K35/3601—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 with inorganic compounds as principal constituents
- B23K35/361—Alumina or aluminates
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- 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
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Definitions
- the present invention relates to a duplex stainless steel welding wire, and more particularly
- the present invention relates to a flux-cored wire for duplex stainless steel welding, which can impart excellent properties of weld metal toughness and ductility by refining the crystal grains when solidified.
- Duplex stainless steel is a stainless steel with toughness and corrosion resistance that has Cr, Ni and Mo as the main elements and is adjusted so that the phase ratio of ferritic iron and austenitic iron is about 50%. is there.
- the weld metal is used as solidified.
- the crystal grain size of the weld metal becomes significantly coarser, and the toughness and ductility deteriorate. Therefore, in the welding of duplex stainless steel, refining the solidified crystal grains of the weld metal can be an effective method for improving the toughness and ductility of the weld metal.
- a method for refining the crystal grains of stainless steel As a method for refining the crystal grains of stainless steel, a method for defining rolling conditions (relationship between rolling ratio and temperature) of the slab in order to suppress the occurrence of roving (surface irregularities) (for example, Patent Document 1) ), And methods for defining hot rolling and cooling conditions after forging (for example, see Patent Document 2), both of which are re-heated and hot-rolled after solidification of molten steel, or annealed It uses the structure control by transformation in one cooling process. It is not a technique to refine crystal grains during the solidification process of weld metal, but it is not an effective method for miniaturization of weld metal in duplex stainless steel that is used in solidification after welding.
- Patent Documents 3 and 4 As a method for refining the crystal grains of a stainless steel weld metal that has been solidified, there has been disclosed a method of solidifying equiaxed crystals using inclusions as inoculation nuclei (see Patent Documents 3 and 4). They are martensitic stainless steel and austenitic stainless steel, and the ratios of Mn content and CrZNi content are different from the duplex stainless steel that is the subject of the present invention.
- duplex stainless steels low-cost duplex stainless steels with reduced amounts of Ni and Mo have been developed due to the recent rise in Ni and Mo (for example, see Patent Document 5).
- the conventional duplex stainless steel welding material in which the solidified crystal grains become coarse, is used.
- Patent Document 1 Japanese Patent Laid-Open No. 0 3-0 7 1 9 0 2
- Patent Document 2 Japanese Patent Application Laid-Open No. 08-8-2 7 7 4 2 3
- Patent Document 3 Japanese Patent Laid-Open No. 2 0 0 2 ⁇ 3 3 1 3 8 7
- Patent Document 4 Japanese Patent Laid-Open No. 2 0 0 3 ⁇ 1 3 6 2 8 0
- Patent Document 5 WO-2 0 0 2 1 0 2 7 0 5 6 Summary of the Invention
- the present invention enables the refinement of the solidified crystal grains of the weld metal and the refinement of the weld metal used when welding the duplex stainless steel material.
- An object of the present invention is to provide a flux cored wire for welding a duplex stainless steel that can obtain a weld having good mechanical properties such as toughness and ductility. Means for solving the problem
- the present invention solves the above-mentioned problems, and the gist thereof is as follows.
- a flux-cored wire for welding duplex stainless steel for refining solidified crystal grains characterized in that the balance consists of iron and inevitable impurities.
- Cr equivalent Cr (mass%) + o (mass%) + 1.5 X Si (mass%)
- Ni equivalent Ni (mass%) + 0.5 XM n
- the weld metal structure when welding ordinary duplex stainless steel materials and inexpensive duplex stainless steel materials, the weld metal structure can be refined by defining the components of the welding material to be used. Metal toughness and ductility can be greatly improved.
- the present inventors butt-welded two-phase stainless steel materials by TIG welding using Cr-Ni-stainless steel wires added with various chemical components, and the structure, toughness and ductility of the formed weld metal were determined. We investigated and examined in detail.
- the weld metal of Cr-Ni stainless steel is classified into a component system in which the primary crystal solidification phase is a ferrite phase or an austenite phase depending on the component system, and further, these phases complete solidification independently. It is categorized as one that completes solidification with two phases: one and ferrite phase + austenite phase.
- Ti N has a very good lattice matching with the ferrite phase, so it becomes a solidification nucleus of the ferrite phase, promotes equiaxed crystallization of the ferrite phase, and fines the ferrite grains during solidification. It becomes effective to become. Further, (including M G_ ⁇ _ A l 2 ⁇ 3 spinel phase) M g inclusions becomes a product nucleus of T i N, promotes the production of T i N, as a result, equiaxed ferrite phase Promotes crystallization and refines ferrite crystal grains during solidification.
- T i N has little lattice matching with the austenite phase, so it hardly becomes a solidification nucleus of the austenite phase.
- the interfacial energy between the liquid phase and the austenite phase is larger than the interfacial energy between the liquid phase and the ferrite phase, it is difficult for the austenite phase to form on the ferrite phase. Generate and grow independently regardless of growth. In other words, miniaturization of the austenite phase cannot be expected.
- the weld metal It is necessary to limit this component system to a component system in which the primary crystal solidification phase is a ferrite phase and solidification is completed in a single ferrite phase.
- the austenite phase is independent regardless of the formation and growth of the ferrite phase.
- Aus to grow The tenite phase solidifies into columnar crystals and the austenite phase is not refined.
- the primary crystal solidification phase is 0.7. It has been found that a component system satisfying the relational expression of 3 XC r equivalent—N i equivalent ⁇ 4.0 is sufficient.
- the Cr equivalent and the Ni equivalent are defined by the following (formula 1) and (formula 2), respectively.
- N i equivalent Ni (mass%) + 0.5 X M n (mass%)
- Equation 2 In addition, in order to refine the solidified crystal grains of the weld metal, the above primary crystal solid phase is a ferri-solid phase, and in a component system where solidification is completed in a single phase of ferrite. It is necessary to form TiN before the primary Ferrite ⁇ solidifies.
- the Ti content and the N content are set so that Ti N crystallizes at a temperature higher than the temperature at which the primary ferrite phase solidifies (liquidus temperature).
- T i (mass%) XN (mass%) ⁇ 0.0 0 0 4 T i N is ensured before the primary ferrite solidifies. It was also found that the effect of refining solidified crystal grains can be obtained.
- the primary solidification phase of the weld metal is a ferrite phase and solidification is completed in a single phase, and Ti N is reliably generated before the primary ferrite solidification solidifies.
- Flux used when welding duplex stainless steel to obtain solidification grain refinement effect It is a requirement that the component system of the cored wire satisfies 0.7 3 XC r equivalent—N i equivalent ⁇ 4.0 and T i XN ⁇ 0.0 0 0 4.
- Cr equivalent and Ni equivalent are defined by the above (formula 1) and (formula 2), respectively.
- the content of the following components is the total amount (% by mass) contained in the entire hull and flux with respect to the total mass of the wire.
- Second, in the present invention defines the content of the following Wai catcher components to form T i N and M g based inclusions (including M G_ ⁇ - A l 2 ⁇ 3 spinel phase) in the weld metal .
- a 1 A 1, together with a deoxidizing element, coexists with M g M G_ ⁇ - to form A 1 2 ⁇ 3 spinel phase becomes nuclei for T i N, refining the weld metal structure . This effect is exerted at 0.0 0 2%, which is the lower limit. Also, if added in a large amount, a large amount of A 1 oxide is formed and the mechanical properties deteriorate, so 0.05% was made the upper limit.
- M g forms Mg inclusions and forms Ti N production nuclei, which refines the weld metal structure. This effect is exhibited at 0.0 0 0 5%, which was set as the lower limit. Even if added in a large amount, the effect is saturated and problems such as reduced corrosion resistance, reduced penetration of welds, and slag formation on the weld bead occur, so the upper limit was set to 0.0 1%.
- M g based inclusions, oxide is effective for miniaturization of solidified crystal grains as long as it is a compound containing M g such sulfides, M g 0- A 1 2 0 3 spinel phase also similar effects have.
- T i forms T i N and becomes a solidified nucleus in the ferrite phase. Refine the weld metal structure. The effect is further improved by adding it in combination with Mg. Since this effect is exerted at 0.0 0 1% or more, this is set as the lower limit. However, if added over 0.5%, the ductility and toughness deteriorate, so this was made the upper limit.
- N forms Ti N and becomes a solidification nucleus, which refines the weld metal structure.
- N is a strong austenite-generating element.
- the Ni content of the austenite-generating element is set to 1.0 to 10.0%, the phase balance between the ferrite phase and the austenite phase is reduced. Necessary from the viewpoint and improve pitting corrosion resistance in chloride environment. These effects are exhibited at 0.10% or more, and this is set as the lower limit. Also, if added in a large amount, it hardens and the toughness decreases, so 0.30% was made the upper limit.
- the upper limit is preferably set to 0.22%.
- C is harmful to corrosion resistance, but it needs to be contained in a certain amount from the viewpoint of strength, so 0.001% or more is added. In addition, if the content exceeds 0.1%, the toughness and ductility of the weld metal are significantly reduced, and in the as-welded state and reheated, it combines with Cr and the corrosion resistance of these regions. In order to significantly deteriorate the content, the content was limited to 0.001 to 0.1%.
- S i is added as a deoxidizing element, but if it is less than 0.01%, its effect is not sufficient, while if its content exceeds 1.0%, the ductility of the ferrite phase is reduced. As a result, the toughness is greatly reduced and the melt penetration during welding is reduced, which becomes a problem in practical welding. Therefore, The content was limited to 0.001 to 1.0%.
- M n is an austenite-generating element, and the phase balance between the ferrite phase and the austenite phase when the Ni content of the austenite-generating element is set to 1.0 to 10.0%. From the viewpoint, 2.0% or more is necessary. On the other hand, if added over 6.0%, a large amount of moisture is generated during welding and the ductility is lowered, so the content was limited to 2.0 to 6.0%.
- C r is a ferritic element and contributes to the improvement of corrosion resistance as a main element of duplex stainless steel. However, if its content is less than 17.0%, sufficient corrosion resistance cannot be obtained. On the other hand, if the content exceeds 27.0%, the toughness deteriorates, so the content was limited to 17.0-27.0%.
- Ni is an austenite forming element and a main element of duplex stainless steel, but in the present invention, it is necessary to complete solidification in a single ferritic phase. From the viewpoint of solidification form and phase balance when r is added from 17.0 to 27.0%, and from the viewpoint of increasing the raw material cost, the upper limit was made 10.0%. On the other hand, the lower limit is selected in consideration of the application to low-cost duplex stainless steel, but if its content is less than 1.0%, the toughness is significantly reduced. Limited to 0%.
- Mo is an element that improves the corrosion resistance especially in the chloride environment. 0.1% can be added to improve the corrosion resistance, but if the content exceeds 3.0%, the sigma phase is brittle. Since the intermetallic compound is formed and the toughness of the weld metal decreases, its content is limited to 0.1 to 3.0%.
- P and S are inevitable components in weld metal and are limited to some extent for the following reasons.
- Cu has a significant effect on enhancing strength and corrosion resistance, and can be added in an amount of 0.1% or more as an austenite-generating element to ensure toughness, but it exceeds 2.0%. Even if added, the effect is saturated, so when added, the content should be 0.1-2.0%.
- the flux filled in the outer shell does not need to be specified except for the alloy added in the above content range in order to control the component composition in the weld metal.
- flux-cored wire it is usually contained as a flux filling the inside of the outer skin, for example, to improve slag encapsulation and arc stability.
- T i ⁇ 2 1 to 2%
- S i ⁇ 2 2 to 3%
- Z r 0 2 l to 2%
- a 1 2 O 3 0.3 to 0.8%
- FeO 0 2 to 0.6%
- N a 2 ⁇ 0.0 5 to 0.2%
- a 1 F Metal oxide or metal fluoride such as 0.0 1 to 0.1% may be added.
- the metal component contained as a metal oxide or metal fluoride added for improving the slag encapsulation and arc stability is the content of the metal component as the above-mentioned alloy defined in the present invention. Excluded from the scope of
- the flux-cored welding wire of the present invention includes TIG welding and MIG welding.
- Ferritic stainless steel or plain steel was used as the outer sheath, the inner part was filled with flux, and a wire with a diameter of 1.2 ⁇ was prepared with the components shown in Table 1 as mass% of the total mass of the wire.
- the flux includes metal oxides and metal fluorides usually used to improve slag encapsulation and arc stability, as well as metals such as Ni, Cr, Mo, Ti, and Mg. Filled with flour.
- the flux-cored wire is Using butt welding by MIG welding, a welded joint was produced. Incidentally, the welding conditions at this time, the welding current: 2 5 0 A, arc voltage: 2 8 V, welding speed: the 2 5 cm / min, shield gas was A r + 2% O 2.
- the solidification modes in Table 1 are indicated by F when solidification is completed in a single ferrite phase, and by F A when solidification is completed in two phases of primary ferrite + austenite.
- Table 3 shows the results of each evaluation.
- the evaluation results of the crystal grain size in Table 3 are ⁇ (good) when the crystal grain sizes of ferrite and austenite are both 50 / _im or less and the equiaxed crystal ratio is 90% or more.
- Organizations other than X were set as X (bad).
- Table 3 shows the results of the evaluation of the bending ductility of welded joints.
- the comparative example of No. 8 shows that (0.73 3 XC r equivalent-1 Ni equivalent) is lower than the range of the present invention, so that the weld metal becomes two-phase solidification of ferrite + austenite. The solidified crystal grains became coarse, and the toughness and bending ductility of the weld metal both decreased.
- the weld metal is solidified in two phases. As a result, the solidified crystal grains became coarse, and the toughness and bending ductility of the weld metal decreased.
- the value of (T i XN) is lower than the range of the present invention, and in the comparative example of No. 11, the A 1 content and the Mg content are within the present invention range. Because the weld metal was ferritic single-phase solidification due to the lower, the ferrite could not be equiaxed and refined, the solidified crystal grains became coarse, and the toughness and bending ductility of the weld metal were both Declined. Furthermore, the comparative example of No. 1 2 to No. 14 is ferrite single-phase solidification,
- the component content is within the scope of the present invention, so that the crystal grains of the weld metal are made finer than in the comparative example, thereby significantly increasing the toughness and ductility. Are better.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/736,844 US8878099B2 (en) | 2008-05-27 | 2009-05-27 | Flux cored wire for welding duplex stainless steel which refines solidified crystal grains |
JP2009543303A JP4531118B2 (ja) | 2008-05-27 | 2009-05-27 | 凝固結晶粒を微細にする二相ステンレス鋼溶接用フラックス入りワイヤ |
EP09754855A EP2295197B1 (en) | 2008-05-27 | 2009-05-27 | Flux-cored wire for welding of duplex stainless steel which enables the miniaturization of solidified crystal particles |
CN200980119436.XA CN102046325B (zh) | 2008-05-27 | 2009-05-27 | 使凝固晶粒微细化的双相不锈钢焊接用药芯焊丝 |
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JP2010188387A (ja) * | 2009-02-19 | 2010-09-02 | Nippon Steel & Sumikin Welding Co Ltd | 二相ステンレス鋼溶接用フラックス入りワイヤ |
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JP2012223816A (ja) * | 2011-04-07 | 2012-11-15 | Nippon Steel & Sumikin Welding Co Ltd | 二相ステンレス鋼用被覆アーク溶接棒 |
JP2015139807A (ja) * | 2014-01-29 | 2015-08-03 | 日鐵住金溶接工業株式会社 | ステンレス鋼溶接用フラックス入りワイヤ |
JP2017131912A (ja) * | 2016-01-26 | 2017-08-03 | 日鐵住金溶接工業株式会社 | 二相ステンレス鋼溶接用フラックス入りワイヤ |
JP2018130762A (ja) * | 2017-02-14 | 2018-08-23 | 日鐵住金溶接工業株式会社 | 二相ステンレス鋼溶接用フラックス入りワイヤ |
US20220281038A1 (en) * | 2019-11-26 | 2022-09-08 | Esab Seah Corp. | Stainless steel welding wire for use in lng tank manufacturing |
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JP4531118B2 (ja) | 2010-08-25 |
KR101065996B1 (ko) | 2011-09-19 |
US20110062133A1 (en) | 2011-03-17 |
JPWO2009145347A1 (ja) | 2011-10-20 |
US8878099B2 (en) | 2014-11-04 |
CN102046325A (zh) | 2011-05-04 |
EP2295197A1 (en) | 2011-03-16 |
EP2295197A4 (en) | 2011-05-18 |
EP2295197B1 (en) | 2012-12-19 |
KR20110004452A (ko) | 2011-01-13 |
CN102046325B (zh) | 2014-04-23 |
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