WO2022138177A1 - Flux de soudage à l'arc submergé - Google Patents

Flux de soudage à l'arc submergé Download PDF

Info

Publication number
WO2022138177A1
WO2022138177A1 PCT/JP2021/045218 JP2021045218W WO2022138177A1 WO 2022138177 A1 WO2022138177 A1 WO 2022138177A1 JP 2021045218 W JP2021045218 W JP 2021045218W WO 2022138177 A1 WO2022138177 A1 WO 2022138177A1
Authority
WO
WIPO (PCT)
Prior art keywords
mass
flux
less
content
welding
Prior art date
Application number
PCT/JP2021/045218
Other languages
English (en)
Japanese (ja)
Inventor
大 猪股
英亮 高内
Original Assignee
株式会社神戸製鋼所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社神戸製鋼所 filed Critical 株式会社神戸製鋼所
Priority to CN202180053677.XA priority Critical patent/CN116249602A/zh
Priority to KR1020237010907A priority patent/KR20230058481A/ko
Publication of WO2022138177A1 publication Critical patent/WO2022138177A1/fr

Links

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
    • B23K35/24—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
    • 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

Definitions

  • the present invention relates to a flux for submerged arc welding.
  • reactors installed in petroleum refineries and operated under high temperature and high pressure
  • a material having high strength and excellent high temperature characteristics such as 25% Cr-1.0% Mo is used.
  • multi-layer welding by submerged arc welding which is a combination of solid wire and bond flux, is generally used.
  • Such a reactor is required to have excellent toughness in a low temperature environment in addition to the above-mentioned high strength and high temperature characteristics in consideration of brittle fracture during operation in cold regions and suspension of operation.
  • Patent Document 1 discloses a welding method in which Al and N are contained in a wire or a flux and welded for the purpose of improving the low temperature toughness and high temperature strength of the weld metal.
  • the present invention has been made in view of the above problems, and is used for submerged arc welding of Cr-Mo-based steel plates, and stabilizes weld metal having excellent welding workability and excellent mechanical performance. It is an object of the present invention to provide a flux for submerged arc welding that can be obtained.
  • the present inventors have improved work efficiency by containing a larger amount of Al than before in the flux for submerged arc welding and controlling the content of other components such as oxides. While trying, it was found that a weld metal having excellent mechanical performance can be stably obtained even when welding is performed with a high current.
  • a flux for submerged arc welding used for submerged arc welding of Cr—Mo steel sheets For the total mass of flux Mn: 0.01% by mass or more and 5.00% by mass or less, Al: 0.50% by mass or more and 3.00% by mass or less, N: More than 0% by mass and 0.50% by mass or less, MgO: 5.0% by mass or more and 40.0% by mass or less, F: 5.0% by mass or more and 12.0% by mass or less, Ca: 9.5% by mass or more and 21.5% by mass or less, Al 2 O 3 : 11.0% by mass or more and 23.0% by mass or less, SiO 2 conversion value of Si and Si compound: 7.0% by mass or more and 20.0% by mass or less, CO 2 : Contains 3.0% by mass or more and 10.0% by mass or less, C: 1.00% by mass or less, Ni: 1.00% by mass or less, Flux for submerged arc welding characterized by being.
  • a preferred embodiment of the present invention relating to the flux for submerged arc welding relates to the following [2] or [3].
  • Fe The flux for submerged arc welding according to [1] or [2], which contains 0.10% by mass or more and 5.00% by mass or less.
  • the flux for submerged arc welding according to the present invention, it is possible to stably obtain a weld metal having excellent welding workability and excellent mechanical performance.
  • the flux for submerged arc welding according to the present embodiment (hereinafter, may be simply referred to as “flux”) is a flux for submerged arc welding used for submerged arc welding of Cr—Mo-based steel sheets, and is Mn or Mn. It contains a compound, Al, N, MgO, F, Ca, Al 2O 3 , Si or Si compound, CO 2 , C and Ni in predetermined amounts, respectively.
  • Mn 0.01% by mass or more and 5.00% by mass or less>
  • Mn is a component contained in order to secure the room temperature strength of the weld metal and particularly to improve the toughness. Mn also has the effect of deoxidizing the weld metal. If the Mn content in the flux is less than 0.01% by mass, the above effect cannot be obtained, the structure of the weld metal becomes coarse, and the toughness decreases. Therefore, the Mn content in the flux is 0.01% by mass or more, preferably 0.5% by mass or more, and more preferably 1.0% by mass or more with respect to the total mass of the flux.
  • the Mn content in the flux exceeds 5.00% by mass, the creep rupture strength of the weld metal is deteriorated, and the temper embrittlement property is also deteriorated. Therefore, the Mn content in the flux is 5.00% by mass or less with respect to the total mass of the flux, preferably 4.00% by mass or less, and more preferably 3.00% by mass or less. Mn is contained in the flux in the form of Mn simple substance, Mn alloy, Mn compound or the like.
  • Al 0.50% by mass or more and 3.00% by mass or less>
  • Al is a component capable of improving the hardenability of the weld metal and increasing the toughness of the weld metal by miniaturizing the structure. If the Al content in the flux is less than 0.50% by mass, the above effect cannot be obtained. Therefore, the Al content in the flux is 0.50% by mass or more, preferably 0.6% by mass or more, and more preferably 0.8% by mass or more with respect to the total mass of the flux. It is more preferably 0.0% by mass or more, and most preferably 1.2% by mass or more. On the other hand, when the Al content in the flux exceeds 3.00% by mass, the structure becomes coarse and the toughness of the weld metal decreases.
  • the Al content in the flux is 3.00% by mass or less, preferably 2.5% by mass or less, and more preferably 2.0% by mass or less with respect to the total mass of the flux. It is more preferably 8.8% by mass or less, and most preferably 1.6% by mass or less.
  • Al is the total amount of acid-soluble Al contained in the flux in the form of a simple substance of Al or an Al alloy such as Fe—Al. Further, the Al content does not include compounds such as Al 2 O 3 shown below.
  • N is a solid solution strengthening element and is a component capable of increasing the strength of the weld metal.
  • the N content in the flux is preferably more than 0% by mass, preferably 0.05% by mass or more, more preferably 0.10% by mass or more, and 0.12 with respect to the total mass of the flux. It is more preferably 0% by mass or more, and most preferably 0.15% by mass or more.
  • the N content in the flux exceeds 0.50% by mass, the proof stress and tensile strength of the weld metal are remarkably increased by the solid solution strengthening, and as a result, the toughness of the weld metal is lowered. Therefore, the N content in the flux is 0.50% by mass or less, preferably 0.30% by mass or less, more preferably 0.25% by mass or less, and 0. It is more preferably .22% by mass or less, and most preferably 0.20% by mass or less.
  • N is contained in the flux as a nitrogen compound such as MnN, AlN and CrN. In the present embodiment, N is defined as the total amount of these nitrogen compounds converted into N.
  • MgO has a high melting point, promotes solidification of slag, and has the effect of adjusting the bead shape. It also has the role of controlling the amount of oxygen in the weld metal.
  • the MgO content in the flux is less than 5% by mass, the deoxidizing effect during welding is weakened and oxides are increased in the weld metal, so that the toughness is lowered. Therefore, the MgO content in the flux is 5.0% by mass or more, preferably 10.0% by mass or more, and more preferably 20.0% by mass or more, based on the total mass of the flux.
  • the MgO content in the flux exceeds 40.0% by mass, the bead shape deteriorates and the slag peelability deteriorates. Therefore, the MgO content in the flux is 40.0% by mass or less, preferably 38.0% by mass or less, and more preferably 35.0% by mass or less, based on the total mass of the flux.
  • F is contained in the flux in the form of a compound such as a CaF compound, has an effect of increasing the electric conductivity and fluidity of the molten slag, and is one of the components affecting the high temperature viscosity of the molten slag. If the F content in the flux is less than 5.0% by mass, the slag immediately solidifies, hindering the discharge of gas and causing slag seizure. Therefore, the F content in the flux is 5.0% by mass or more, preferably 6.0% by mass or more, and more preferably 7.0% by mass or more with respect to the total mass of the flux.
  • the F content in the flux exceeds 12.0% by mass, the waviness of the bead becomes coarse and the appearance of the bead deteriorates. Therefore, the F content in the flux is 12.0% by mass or less with respect to the total mass of the flux, preferably 11.5% by mass or less, and more preferably 11.0% by mass or less.
  • Ca 9.5% by mass or more and 21.5% by mass or less>
  • Ca is contained as CaO or fluoride, and is a component that enhances the basicity of slag, enhances the cleanliness of the weld metal, and affects the fluidity of molten slag.
  • the Ca content in the flux is 9.5% by mass or more with respect to the total mass of the flux, preferably 11.0% by mass or more, and more preferably 15.0% by mass or more.
  • the CaO content in the flux is 21.5% by mass or less, preferably 21.0% by mass or less, and more preferably 20.0% by mass or less, based on the total mass of the flux.
  • Al 2 O 3 is a component having an effect of improving the fluidity of slag and having a role of controlling the amount of oxygen in the weld metal. If the Al 2 O 3 content in the flux is less than 11.0% by mass, the weld bead and the base metal become less compatible and slag entrainment is likely to occur. Therefore, the Al 2 O 3 content in the flux is 11.0% by mass or more, preferably 13.0% by mass or more, and more preferably 15.0% by mass or more, based on the total mass of the flux. preferable.
  • the Al 2 O 3 content in the flux exceeds 23.0% by mass, the waviness of the bead becomes coarse and the appearance of the bead deteriorates. Therefore, the Al 2 O 3 content in the flux is 23.0% by mass or less, preferably 22.0% by mass or less, and more preferably 20.0% by mass or less, based on the total mass of the flux. preferable.
  • the Al 2 O 3 content is an Al 2 O 3 conversion value of Al contained in the Al compound excluding the Al alloy.
  • Si and Si compound are components having an effect of improving the fluidity of the molten slag. If the SiO 2 conversion value of Si and the Si compound in the flux is less than 7.0% by mass, the weld bead and the base metal become less familiar with each other, and slag entrainment is likely to occur. Therefore, the SiO 2 conversion value in the flux is 7.0% by mass or more, preferably 8.0% by mass or more, and more preferably 9.0% by mass or more with respect to the total mass of the flux.
  • the SiO 2 conversion value in the flux exceeds 20.0% by mass, the amount of oxygen in the weld metal increases and the oxide increases in the weld metal, so that the toughness decreases. Therefore, the SiO 2 conversion value in the flux is 20.0% by mass or less with respect to the total mass of the flux, preferably 18.0% by mass or less, and more preferably 15.0% by mass or less.
  • Si is contained in the flux in the form of a simple substance of Si, a Si alloy, a Si compound, or the like.
  • the SiO 2 conversion value is defined as a value obtained by converting the total of Si contained in all Si and Si compounds into SiO 2 .
  • CO 2 is a component having an effect of controlling the amount of diffusible hydrogen in the weld metal.
  • the CO 2 content in the flux is 3.0% by mass or more, preferably 4.0% by mass or more, and more preferably 5.0% by mass or more, based on the total mass of the flux.
  • the CO 2 content in the flux exceeds 10.0% by mass, the amount of oxygen in the weld metal increases and the toughness decreases.
  • the CO 2 content in the flux is 10.0% by mass or less, preferably 9.0% by mass or less, and more preferably 8.0% by mass or less with respect to the total mass of the flux.
  • CO 2 is contained in the flux in the form of a metal carbonate such as CaCO 3 .
  • CO 2 is defined as a value obtained by converting all metal carbonates into CO 2 .
  • C 1.00% by mass or less (including 0% by mass)>
  • C is a component contained in the flux in order to secure the room temperature strength, creep rupture strength and toughness of the weld metal.
  • C does not necessarily have to be contained in the flux, and other components can improve the room temperature strength, creep breaking strength and toughness of the weld metal, but the C content in the flux is relative to the total mass of the flux. It is preferably 0.05% by mass or more, and more preferably 0.10% by mass or more.
  • the toughness of the weld metal decreases.
  • the C content in the flux is 1.00% by mass or less, preferably 0.80% by mass or less, and more preferably 0.50% by mass or less with respect to the total mass of the flux.
  • C can be contained in the flux in the form of C alone, an alloy, a C compound, or the like.
  • Ni is an element effective for improving the toughness of the weld metal, but is also a component that significantly reduces the creep rupture strength. Ni does not necessarily have to be contained in the flux, and the toughness can be improved by other components, but the Ni content in the flux is 0.01% by mass or more with respect to the total mass of the flux. It is more preferably 0.02% by mass or more, and even more preferably 0.05% by mass or more. On the other hand, when the Ni content in the flux exceeds 1.00% by mass with respect to the total mass of the flux, the creep rupture strength of the weld metal decreases.
  • the Ni content in the flux is 1.00% by mass or less, preferably 0.80% by mass or less, and more preferably 0.50% by mass or less with respect to the total mass of the flux.
  • Ni can be contained in the flux in the form of a simple substance of Ni or a Ni alloy such as Fe—Ni.
  • Total content of Na, K and Li 0.01% by mass or more and 1.00% by mass or less> Since alkali metals such as Na, K and Li are components having an effect of improving arc stability, these alkali metals do not necessarily have to be added to the flux, but in the present embodiment, they are contained in the flux. Preferably contains at least one selected from Na, K and Li. When the total content of Na, K and Li in the flux is 0.01% by mass or more, the above effect can be obtained. Therefore, when the flux contains at least one selected from Na, K and Li, the total content of Na, K and Li in the flux is 0. It is preferably 01% by mass or more, and more preferably 0.05% by mass or more.
  • the total content of Na, K and Li in the flux is 1.00% by mass or less, it is possible to prevent a decrease in the melting point of the slag and obtain an excellent bead shape. Therefore, when the flux contains at least one selected from Na, K and Li, the total content of Na, K and Li in the flux is 1. It is preferably 00% by mass or less, and more preferably 0.5% by mass or less.
  • Na, K and Li can be added to the flux as a fluoride or a composite oxide, and in this embodiment, the compounds containing Na, K and Li are converted into Na, K and Li, respectively. It is specified by the specified value.
  • Fe is a component having an effect of preventing seizure of slag. Fe does not necessarily have to be contained in the flux, but when it is contained, the above effect can be obtained when the Fe content in the flux is 0.10% by mass or more. Therefore, the Fe content in the flux is preferably 0.10% by mass or more, more preferably 0.30% by mass or more, based on the total mass of the flux. On the other hand, when the Fe content in the flux is 5.00% by mass or less, the solidification temperature of the slag can be adjusted, and deterioration of the bead appearance, bead shape and slag peeling can be prevented. Therefore, the Fe content in the flux is preferably 5.00% by mass or less, and more preferably 3.00% by mass or less. Fe is defined by the total amount of all Fe contained in Fe simple substance, Fe alloy, Fe oxide and the like.
  • the flux according to the present embodiment preferably contains 85% by mass or more of the SiO 2 conversion values of Mn, Al, N, MgO, F, Ca, Si and Si compounds, CO 2 , C and Ni in total, 90. It is more preferably contained in an amount of 93% by mass or more, further preferably contained in an amount of 93% by mass or more, and particularly preferably contained in an amount of 95% by mass or more. Inevitable impurities are included in addition to the above components. Further, various components of, for example, an Sr compound and a Ba compound can be contained depending on the required characteristics of the weld metal.
  • the raw material powder is blended so as to have the above-mentioned composition, kneaded with the binder, granulated, and fired. At that time, for example, sodium silicate or the like can be used as the binder.
  • the granulation method is not particularly limited, but a method using a rolling granulation machine, an extrusion type granulation machine, or the like is preferable.
  • Baking after granulation can be performed in a rotary kiln, a stationary batch furnace, a belt-type firing furnace, or the like.
  • the firing temperature at that time is preferably 350 ° C. or higher, more preferably 450 ° C. or higher, from the viewpoint of changing the binder to be water-insoluble as described above.
  • the upper limit is not particularly limited, but is usually 1200 ° C. or lower.
  • PWHT Post Weld Heat Treatment
  • PWHT condition A 1 hour at 690 ° C.
  • PWHT condition B 8 hours at 685 ° C.
  • PWHT condition C 6 hours at 670 ° C.
  • low temperature toughness was evaluated by performing a Charpy impact test of a metallic material in accordance with JIS Z2242: 2018.
  • the Charpy impact test at -30 ° C was carried out twice, the average value of the two Charpy impact values obtained was 80 J / cm 2 or more, and the minimum value of each measurement was 60 J / cm 2 .
  • ⁇ excellent
  • those with an average value of 54 J / cm 2 or more and a minimum value of 47 J / cm 2 or more and less than 60 J / cm 2 for each measurement were ⁇ (good).
  • Table 3 below shows the welding wire, flux, welding conditions, post-welding heat treatment conditions, and evaluation results of each test used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

L'invention concerne un flux de soudage à l'arc submergé permettant d'obtenir de manière stable un métal de soudure présentant une excellente aptitude au soudage et d'excellentes performances mécaniques. Le présent flux de soudage à l'arc submergé, qui est utilisé pour effectuer un soudage à l'arc submergé sur une tôle d'acier à base de Cr-Mo, contient, par rapport à la masse totale du flux, 0,01 à 5,00 % en masse de Mn, 0,50 à 3,00 % en masse d'Al, plus de 0 % en masse mais pas plus de 0,50 % en masse de N, 5,0 à 40,0 % en masse de MgO, 5,0 à 12,0 % en masse de F, 9,5 à 21,5 % en masse de Ca, 11,0 à 23,0 % en masse d'Al2O3, 7,0 à 20,0 % en masse de Si et d'un composé de Si en termes de SiO2, et 3,0 à 10,0 % en masse de CO2, et ne contient pas plus de 1,00 % en masse de C et pas plus de 1,00 % en masse de Ni.
PCT/JP2021/045218 2020-12-23 2021-12-08 Flux de soudage à l'arc submergé WO2022138177A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202180053677.XA CN116249602A (zh) 2020-12-23 2021-12-08 埋弧焊用焊剂
KR1020237010907A KR20230058481A (ko) 2020-12-23 2021-12-08 서브머지드 아크 용접용 플럭스

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-213838 2020-12-23
JP2020213838A JP2022099821A (ja) 2020-12-23 2020-12-23 サブマージアーク溶接用フラックス

Publications (1)

Publication Number Publication Date
WO2022138177A1 true WO2022138177A1 (fr) 2022-06-30

Family

ID=82157771

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/045218 WO2022138177A1 (fr) 2020-12-23 2021-12-08 Flux de soudage à l'arc submergé

Country Status (4)

Country Link
JP (1) JP2022099821A (fr)
KR (1) KR20230058481A (fr)
CN (1) CN116249602A (fr)
WO (1) WO2022138177A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000239816A (ja) * 1999-02-15 2000-09-05 Nippon Steel Corp メッキ槽
JP2013039604A (ja) * 2011-08-17 2013-02-28 Kobe Steel Ltd サブマージアーク溶接用ボンドフラックス及びワイヤ
JP2013154363A (ja) * 2012-01-27 2013-08-15 Kobe Steel Ltd 片面サブマージアーク溶接用フラックス
JP2020131221A (ja) * 2019-02-15 2020-08-31 日鉄溶接工業株式会社 高張力鋼用のサブマージアーク溶接用焼成型フラックス

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5858982A (ja) 1981-09-10 1983-04-07 Kobe Steel Ltd Ｃｒ−Ｍｏ系低合金鋼の潜弧溶接方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000239816A (ja) * 1999-02-15 2000-09-05 Nippon Steel Corp メッキ槽
JP2013039604A (ja) * 2011-08-17 2013-02-28 Kobe Steel Ltd サブマージアーク溶接用ボンドフラックス及びワイヤ
JP2013154363A (ja) * 2012-01-27 2013-08-15 Kobe Steel Ltd 片面サブマージアーク溶接用フラックス
JP2020131221A (ja) * 2019-02-15 2020-08-31 日鉄溶接工業株式会社 高張力鋼用のサブマージアーク溶接用焼成型フラックス

Also Published As

Publication number Publication date
JP2022099821A (ja) 2022-07-05
KR20230058481A (ko) 2023-05-03
CN116249602A (zh) 2023-06-09

Similar Documents

Publication Publication Date Title
JP6290024B2 (ja) 高Ｃｒ系ＣＳＥＦ鋼のタンデムサブマージアーク溶接方法
CN107617809B (zh) 埋弧焊方法
WO2018051823A1 (fr) Fil pour soudage électrique sous laitier, flux pour soudage électrique sous laitier et joint soudé
KR102088179B1 (ko) 서브머지드 아크 용접용 와이어
JP6209135B2 (ja) 狭開先タンデムサブマージアーク溶接方法
CN116568841A (zh) 埋弧焊用焊丝和使用了该埋弧焊用焊丝的焊接接头部的制造方法
WO2022138177A1 (fr) Flux de soudage à l'arc submergé
WO2021177106A1 (fr) Flux pour un soudage sous laitier et procédé de soudage sous laitier
JP3945396B2 (ja) 炭酸ガスシールドアーク溶接用鋼ワイヤおよびそれを用いた溶接方法
JP2593614B2 (ja) 高Ｃｒフェライト系耐熱鋼用潜弧溶接方法
KR20020008681A (ko) 탄산가스 아크 용접용 티타니아계 플럭스 충전와이어
JP4581842B2 (ja) サブマージアーク溶接用溶融型フラックス
JP6071797B2 (ja) 片面サブマージアーク溶接用フラックス
JP2022157587A (ja) フラックス入りワイヤ及び溶接継手の製造方法
JP2004337871A (ja) 低合金耐熱鋼用低水素系被覆アーク溶接棒
CN112154042A (zh) 电渣焊用实芯焊丝及焊接接头
JP3617369B2 (ja) 極低炭素鋼板のサブマージアーク溶接方法
JPH0122078B2 (fr)
JP3718464B2 (ja) ガスシールドアーク溶接用フラックス入りワイヤ
CN117916055A (zh) 埋弧焊用粘结焊剂和焊接金属
JP2013126680A (ja) サブマージアーク溶接用溶融型フラックス
WO2023037920A1 (fr) Flux de liaison pour soudage à l'arc submergé, et métal soudé
WO2021172079A1 (fr) Fil fourré en alliage à base de ni
JP5051966B2 (ja) 横向き炭酸ガスシールドアーク溶接方法
JPH06277879A (ja) 高Ｃｒフェライト系耐熱鋼の潜弧溶接方法

Legal Events

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

Ref document number: 21910326

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20237010907

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21910326

Country of ref document: EP

Kind code of ref document: A1