WO2023184787A1 - Flux-cored gas shielded welding wire for 9% ni steel used for storage tanks, and preparation method and use method therefor - Google Patents

Flux-cored gas shielded welding wire for 9% ni steel used for storage tanks, and preparation method and use method therefor Download PDF

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WO2023184787A1
WO2023184787A1 PCT/CN2022/105610 CN2022105610W WO2023184787A1 WO 2023184787 A1 WO2023184787 A1 WO 2023184787A1 CN 2022105610 W CN2022105610 W CN 2022105610W WO 2023184787 A1 WO2023184787 A1 WO 2023184787A1
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welding
powder
flux
welding wire
cored
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PCT/CN2022/105610
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French (fr)
Chinese (zh)
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李伟
王晓斌
马行健
范益
闫旭强
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南京钢铁股份有限公司
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Publication of WO2023184787A1 publication Critical patent/WO2023184787A1/en

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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
    • B23K35/3033—Ni as the principal constituent
    • 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
    • B23K35/3066—Fe as the principal constituent with Ni as next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/362—Selection of compositions of fluxes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • 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
    • 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
    • B23K35/40—Making wire or rods for soldering or welding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to the technical field of steel production, and in particular to a flux-cored gas-shielded welding wire for 9% Ni storage tank steel and its preparation and use methods.
  • Natural gas resources are important strategic resources, with huge production, storage and transportation volumes.
  • 9% Ni steel is widely used in the construction of liquefied natural gas storage tanks due to its excellent ultra-low temperature performance.
  • Storage tank steel containing 9% Ni is also called 9Ni steel.
  • the grades are 9Ni590A and 9Ni590B. It is widely used to store and transport liquefied natural gas. Its service environment is -196°C ultra-low temperature.
  • submerged arc welding and electrode welding are mainly used.
  • Submerged arc welding is used for tank bottom welding and side plate horizontal welding, and electrodes are used for vertical welding of side plates and overhead welding of other parts.
  • the welding rod is limited by the length of the welding rod, and the length of each weld is limited. During the welding process, the burning of the welding rod will also be shortened, which will lead to the need for continuous adjustment of the operating techniques. This requires high technical and physical requirements for the welding operator, and the work low efficiency.
  • Flux-cored gas shielded welding wire has the advantages of easy adjustment of composition, low welding operation requirements, and long-distance continuous welding. Compared with welding rods, it has lower operating requirements and higher work efficiency. It can replace welding rods for vertical welding of side plates of 9Ni steel storage tanks and Overhead welding of other parts. At present, Jingqun domestically and Kobelco and Lincoln abroad have conducted research and development of related welding materials, but there is still no mature flux-cored welding wire for 9Ni steel that can be applied on a large scale.
  • the present invention aims at the above technical problems, overcomes the shortcomings of the existing technology, and provides a flux-cored gas-shielded welding wire for 9% Ni storage tank steel, including 62% to 68% steel strip and 32% to 38% powder.
  • the chemical composition of the powder rutile: 18% ⁇ 26%, zircon sand: 3% ⁇ 5%, potassium titanate: 3% ⁇ 5%, electrolytic manganese: 2% ⁇ 4%, nickel powder: 56.08% ⁇ 60.41 %, molybdenum powder: 10.40% ⁇ 12.68%, cobalt powder: 0.01% ⁇ 0.02%, aluminum powder: 0.02% ⁇ 0.04%, high carbon ferrochrome: 22.62% ⁇ 24.64%, the balance is iron powder. .
  • the aforementioned flux cored gas shielded welding wire for 9% Ni storage tank steel The chemical composition of high carbon ferrochromium: Cr: 84% ⁇ 86%, C: 10% ⁇ 12%, the balance is iron and unavoidable Impurities, particle size ⁇ 0.3mm.
  • the second object of the present invention is to provide a method for preparing flux-cored gas shielded welding wire for 9% Ni storage tank steel.
  • the conventional flux-cored welding wire preparation method is used to roll the steel strip into a U-shaped tube, and then add the powder into the U-shaped tube. , then seaming, wire drawing, diameter reduction, wire take-up, surface treatment, and layer winding to prepare flux-cored gas-shielded welding wire for 9% Ni storage tank steel with a diameter of 1.2 mm.
  • the third object of the present invention is to provide a method of using flux-cored gas shielded welding wire for 9% Ni storage tank steel, using a mixed gas of 100% CO 2 or 80% Ar+20% CO 2 for gas protection, and the gas flow rate is 18 ⁇ 20L/min; no preheating is required before welding, and the layer temperature must be between 50 and 80°C during the welding process; during welding, the first layer welding current is 135 ⁇ 145A, the voltage is 20.6 ⁇ 20.8V, and the welding speed is 14 ⁇ 15cm/ min; the second layer welding current is 145 ⁇ 155A, the voltage is 22.8 ⁇ 23.9V, the welding speed is 15 ⁇ 16cm/min; the third layer welding current is 160 ⁇ 170A, the voltage is 23.5 ⁇ 23.8V, the welding speed is 18 ⁇ 20cm/min; subsequent welding parameters are the same as those of the third layer.
  • the rutile content of the traditional Chinese medicine powder of the present invention is 18% to 26%, and the zircon sand content is 3% to 5%, which can adjust the melting point of the slag and the viscosity of the molten pool liquid; a thin layer of protective slag will be formed during the welding process , reduce the pore sensitivity of the weld metal and ensure the quality of weld flaw detection; when the addition amount is lower than the design value, the effect is not obvious; when the addition amount is higher than the upper limit, the formability of the weld metal will be deteriorated;
  • the potassium titanate content of the traditional Chinese medicine powder of the present invention is 3% to 5%, which stabilizes the arc and improves the performance of the welding process;
  • Co in the traditional Chinese medicine powder of the present invention is 0.01% to 0.02%. Co can refine the grains and improve the strength and toughness of the weld metal. However, because Co is expensive, adding a small amount can meet certain needs. Adding too much will significantly increase the cost;
  • Al in the traditional Chinese medicine powder of the present invention is 0.02% to 0.04%.
  • Al can combine with Ni, Mo, and Fe to form Ni 3 Al, Mo 3 Al, and Fe 3 Al to strengthen the weld and ensure yield and tensile strength.
  • the added amount Too much will lead to increased brittleness;
  • the steel strip and the powder are used to transfer alloy elements together.
  • the Ni content in the formed weld metal is 66% to 68%.
  • the Ni element has excellent low-temperature impact toughness. Too high content will cause costs. If the content is too low, it will affect the low-temperature impact performance of the weld.
  • the Ni content in the steel strip of the present invention is 10.15% ⁇ 12.03%, and the Ni content in the powder is 56.08% ⁇ 60.41%. After welding and burning, a certain amount of Ni can still be retained.
  • Ni element ensures the full austenitic structure of the weld and obtains good ultra-low temperature toughness; when forming the weld joint, it avoids the dilution and diffusion of the base metal to the weld, and the decrease in low-temperature toughness caused by changes in the structure and properties near the fusion line, ensuring the welding After the seam metal is diluted by the base material, the composition can still meet the low-temperature impact toughness requirements of -196°C;
  • Ni content of the steel strip in the present invention is 10.15% to 12.03%. Since the flux-cored welding wire has moisture absorption, adding a certain amount of Ni to the steel strip can effectively prevent the welding wire from rusting and extend the storage time;
  • the welding method in the present invention is crucial to the use of welding materials.
  • the use of 100% CO 2 gas can be used normally, and the use of a mixed gas of 80% Ar+20% CO 2 can reduce spatter during welding and improve impact toughness;
  • During the welding process ensure that the layer temperature is between 50 and 80°C to prevent excessive floating of Al elements in the molten pool caused by over-burning of the metal elements and slow cooling rate;
  • the welding parameter setting in the present invention effectively controls the fusion ratio with the base metal, reduces the width of the heat-affected zone of the base metal, and ensures joint performance.
  • This embodiment provides a flux-cored gas shielded welding wire for 9% Ni storage tank steel, which is composed of 62% steel strip and 38% powder.
  • the chemical composition of the steel strip is: C is 0.016%, Si is 0.51%, Mn is 0.57%, Cr is 3.15%, Ni is 10.15%, P ⁇ 0.002%, S ⁇ 0.001%, the balance is Fe and unavoidable of impurities.
  • the chemical composition of the powder is: 18% rutile, 5% zircon sand, 3% potassium titanate, 4% electrolytic manganese, 60.41% nickel powder, 10.40% molybdenum powder, and 0.01% cobalt powder. 0.02%, aluminum powder is 0.02% to 0.04%, high carbon ferrochrome is 24.64%, and the balance is iron powder.
  • the purity of rutile, zircon sand, potassium titanate, electrolytic manganese, nickel powder, molybdenum powder, cobalt powder, and aluminum powder is ⁇ 99%, and the particle size is ⁇ 0.3mm.
  • Preparation method Use conventional flux-cored wire preparation methods to roll the steel strip into a U-shaped tube, then add the powder into the U-shaped tube, then seam, wire drawing, diameter reduction, wire take-up, surface treatment, and layer winding. , to prepare flux cored gas shielded welding wire for 9% Ni storage tank steel with a diameter of 1.2mm.
  • the layer temperature must be between 50 and 80°C during the welding process.
  • the first layer welding current is 135 ⁇ 145A, the voltage is 20.6 ⁇ 20.8V, and the welding speed is 14 ⁇ 15cm/min;
  • the second layer welding current is 145 ⁇ 155A, the voltage is 22.8 ⁇ 23.9V, and the welding speed is 15 ⁇ 16cm/min;
  • the third layer welding current is 160 ⁇ 170A, the voltage is 23.5 ⁇ 23.8V, the welding speed is 18 ⁇ 20cm/min; subsequent welding parameters are the same as the third layer welding parameters.
  • the joint requirements are Rm ⁇ 690MPa, bending crack rate ⁇ 20%, and AKv ⁇ 47J at -196°C.
  • the mechanical properties of the joint were tested.
  • the tensile strength was 721MPa and 726MPa.
  • the AKv at each position at -196°C is as shown in Table 1.
  • This flux cored gas shielded welding wire meets the usage requirements.
  • This embodiment provides a flux-cored gas-shielded welding wire for 9% Ni storage tank steel.
  • the difference from Embodiment 1 is that it is composed of 65% steel strip and 35% powder.
  • the chemical composition of the steel strip is: C is 0.025%, Si is 0.63%, Mn is 0.43%, Cr is 4.67%, Ni is 11.08%, P ⁇ 0.002%, S ⁇ 0.001%, the balance is Fe and unavoidable of impurities.
  • the chemical composition of the powder is: 22% rutile, 4% zircon sand, 4% potassium titanate, 3% electrolytic manganese, 58.22% nickel powder, 11.34% molybdenum powder, and 0.01% cobalt powder.
  • the layer temperature must be between 50 and 80°C during the welding process.
  • the first layer welding current is 135 ⁇ 145A, the voltage is 20.6 ⁇ 20.8V, and the welding speed is 14 ⁇ 15cm/min;
  • the second layer welding current is 145 ⁇ 155A, the voltage is 22.8 ⁇ 23.9V, and the welding speed is 15 ⁇ 16cm/min;
  • the third layer welding current is 160 ⁇ 170A, the voltage is 23.5 ⁇ 23.8V, the welding speed is 18 ⁇ 20cm/min; subsequent welding parameters are the same as the third layer welding parameters.
  • the joint requirements are Rm ⁇ 690MPa, bending crack rate ⁇ 20%, and AKv ⁇ 47J at -196°C.
  • the mechanical properties of the joint were tested.
  • the tensile strength was 701MPa and 712MPa, and there were no cracks in bending.
  • the AKv of each position at -196°C is as shown in Table 2.
  • This flux cored gas shielded welding wire meets the usage requirements.
  • This embodiment provides a flux-cored gas-shielded welding wire for 9% Ni storage tank steel.
  • the difference from Embodiment 1 is that it is composed of 68% steel strip and 32% powder.
  • the chemical composition of the steel strip is: C is 0.031%, Si is 0.70%, Mn is 0.29%, Cr is 5.03%, Ni is 12.03%, P ⁇ 0.002%, S ⁇ 0.001%, the balance is Fe and unavoidable of impurities.
  • the chemical composition of the powder is: 26% rutile, 3% zircon sand, 5% potassium titanate, 2% electrolytic manganese, 56.08% nickel powder, 10.40% molybdenum powder, and 0.01% cobalt powder. 0.02%, aluminum powder is 0.02% to 0.04%, high carbon ferrochrome is 22.62%, and the balance is iron powder.
  • the first layer welding current is 135 ⁇ 145A, the voltage is 20.6 ⁇ 20.8V, and the welding speed is 14 ⁇ 15cm/min;
  • the second layer welding current is 145 ⁇ 155A, the voltage is 22.8 ⁇ 23.9V, and the welding speed is 15 ⁇ 16cm/min;
  • the third layer welding current is 160 ⁇ 170A, the voltage is 23.5 ⁇ 23.8V, the welding speed is 18 ⁇ 20cm/min; subsequent welding parameters are the same as the third layer welding parameters.
  • the joint requirements are Rm ⁇ 690MPa, bending crack rate ⁇ 20%, and AKv ⁇ 47J at -196°C.
  • the mechanical properties of the joint were tested.
  • the tensile strength was 707MPa and 695MPa, and there were no cracks in bending.
  • the AKv at each position at -196°C is as shown in Table 3.
  • This flux cored gas shielded welding wire meets the usage requirements.

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  • Mechanical Engineering (AREA)
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Abstract

A flux-cored gas shielded welding wire for 9% Ni steel used for storage tanks, which wire comprises 62-68% of a steel strip, and 32-38% of a flux powder, wherein the steel strip comprises the following chemical components: 0.016-0.031% of C, 0.51-0.70% of Si, 0.29-0.57% of Mn, 3.15-5.03% of Cr, 10.15-12.03% of Ni, ≤0.002% of P, and ≤0.001% of S, with the balance being Fe and inevitable impurities; and the flux powder comprises the following chemical components: 18-26% of rutile, 3-5% of zircon sand, 3-5% of potassium titanate, 2-4% of electrolytic manganese, 56.08-60.41% of a nickel powder, 10.40-12.68% of a molybdenum powder, 0.01-0.02% of a cobalt powder, 0.02-0.04% of an aluminum powder, and 22.62-24.64% of high-carbon ferrochrome, with the balance being an iron powder. The welding wire has a higher deposition rate and higher welding efficiency. The present invention further relates to a preparation method for a flux-cored gas shielded welding wire for 9% Ni steel used for storage tanks, and a use method for same.

Description

一种9％Ni储罐钢用药芯气保焊丝及其制备、使用方法A flux-cored gas-shielded welding wire for 9% Ni storage tank steel and its preparation and use methods 技术领域Technical field
本发明涉及钢铁生产技术领域，特别是涉及一种9％Ni储罐钢用药芯气保焊丝及其制备、使用方法。The invention relates to the technical field of steel production, and in particular to a flux-cored gas-shielded welding wire for 9% Ni storage tank steel and its preparation and use methods.
背景技术Background technique
天然气资源是重要战略资源，开采储运量极大。9％Ni钢因其优异的超低温性能，大规模应用在液化天然气储罐的建造。含Ni量9％的储罐用钢，又称为9Ni钢，按照GB 24510牌号为9Ni590A和9Ni590B，广泛用于储存和运输液化天然气，其服役环境为-196℃超低温。Natural gas resources are important strategic resources, with huge production, storage and transportation volumes. 9% Ni steel is widely used in the construction of liquefied natural gas storage tanks due to its excellent ultra-low temperature performance. Storage tank steel containing 9% Ni is also called 9Ni steel. According to GB 24510, the grades are 9Ni590A and 9Ni590B. It is widely used to store and transport liquefied natural gas. Its service environment is -196°C ultra-low temperature.
在9Ni钢储罐制造时，主要是采用埋弧焊和焊条焊的方式，埋弧焊用于罐底焊接和侧板横焊，焊条用于侧板立焊和其他部位的仰焊。焊条因受焊条长度的限制，每次焊接的焊缝长度有限，在施焊过程中也会因为焊条的燃烧缩短而导致操作手法需要不断调整，对焊接操作人员的技术、体力要求较高，工作效率低下。When manufacturing 9Ni steel storage tanks, submerged arc welding and electrode welding are mainly used. Submerged arc welding is used for tank bottom welding and side plate horizontal welding, and electrodes are used for vertical welding of side plates and overhead welding of other parts. The welding rod is limited by the length of the welding rod, and the length of each weld is limited. During the welding process, the burning of the welding rod will also be shortened, which will lead to the need for continuous adjustment of the operating techniques. This requires high technical and physical requirements for the welding operator, and the work low efficiency.
药芯气保焊丝具有成分易调整、焊接操作要求低、可长距离连续施焊的优点，相对于焊条操作要求低、工作效率更高，能替代焊条进行9Ni钢储罐的侧板立焊和其他部位的仰焊。目前，国内有京群，国外有神钢、林肯进行了相关焊材的研发，但仍无成熟的、可大规模应用的9Ni钢用药芯焊丝。Flux-cored gas shielded welding wire has the advantages of easy adjustment of composition, low welding operation requirements, and long-distance continuous welding. Compared with welding rods, it has lower operating requirements and higher work efficiency. It can replace welding rods for vertical welding of side plates of 9Ni steel storage tanks and Overhead welding of other parts. At present, Jingqun domestically and Kobelco and Lincoln abroad have conducted research and development of related welding materials, but there is still no mature flux-cored welding wire for 9Ni steel that can be applied on a large scale.
发明内容Contents of the invention
本发明针对上述技术问题，克服现有技术的缺点，提供一种9％Ni储罐钢用药芯气保焊丝，包括62％～68％的钢带与32％～38％的药粉，The present invention aims at the above technical problems, overcomes the shortcomings of the existing technology, and provides a flux-cored gas-shielded welding wire for 9% Ni storage tank steel, including 62% to 68% steel strip and 32% to 38% powder.
钢带的化学组分：C：0.016％～0.031％，Si：0.51％～0.70％，Mn：0.29％～0.57％，Cr：3.15％～5.03％，Ni：10.15％～12.03％，P≤0.002％，S≤0.001％，余量为Fe和不可避免的杂质；Chemical composition of steel strip: C: 0.016% ~ 0.031%, Si: 0.51% ~ 0.70%, Mn: 0.29% ~ 0.57%, Cr: 3.15% ~ 5.03%, Ni: 10.15% ~ 12.03%, P ≤ 0.002 %, S≤0.001%, the balance is Fe and inevitable impurities;
药粉的化学组分：金红石：18％～26％，锆英砂：3％～5％，钛酸钾：3％～5％， 电解锰：2％～4％，镍粉：56.08％～60.41％，钼粉：10.40％～12.68％，钴粉：0.01％～0.02％，铝粉：0.02％～0.04％，高碳铬铁：22.62％～24.64％，余量为铁粉。。The chemical composition of the powder: rutile: 18% ~ 26%, zircon sand: 3% ~ 5%, potassium titanate: 3% ~ 5%, electrolytic manganese: 2% ~ 4%, nickel powder: 56.08% ~ 60.41 %, molybdenum powder: 10.40% ~ 12.68%, cobalt powder: 0.01% ~ 0.02%, aluminum powder: 0.02% ~ 0.04%, high carbon ferrochrome: 22.62% ~ 24.64%, the balance is iron powder. .
本发明进一步限定的技术方案是：The technical solution further limited by the present invention is:
前所述的一种9％Ni储罐钢用药芯气保焊丝，金红石、锆英砂、钛酸钾、电解锰、镍粉、钼粉、钴粉、铝粉的纯度≥99％，粒度≤0.3mm。The aforementioned flux cored gas shielded welding wire for 9% Ni storage tank steel, the purity of rutile, zircon sand, potassium titanate, electrolytic manganese, nickel powder, molybdenum powder, cobalt powder, and aluminum powder is ≥99%, and the particle size is ≤ 0.3mm.
前所述的一种9％Ni储罐钢用药芯气保焊丝，高碳铬铁的化学成分：Cr：84％～86％，C：10％～12％，余量为铁和不可避免的杂质，粒度≤0.3mm。The aforementioned flux cored gas shielded welding wire for 9% Ni storage tank steel. The chemical composition of high carbon ferrochromium: Cr: 84% ~ 86%, C: 10% ~ 12%, the balance is iron and unavoidable Impurities, particle size ≤0.3mm.
本发明的第二目的在于提供一种9％Ni储罐钢用药芯气保焊丝制备方法，采用常规药芯焊丝制备方法，将钢带轧制成U形管，再将药粉加入U形管中，然后合缝、拉丝减径、收线、表面处理、层绕，制得直径为1.2mm的9％Ni储罐钢用药芯气保焊丝。The second object of the present invention is to provide a method for preparing flux-cored gas shielded welding wire for 9% Ni storage tank steel. The conventional flux-cored welding wire preparation method is used to roll the steel strip into a U-shaped tube, and then add the powder into the U-shaped tube. , then seaming, wire drawing, diameter reduction, wire take-up, surface treatment, and layer winding to prepare flux-cored gas-shielded welding wire for 9% Ni storage tank steel with a diameter of 1.2 mm.
本发明的第三目的在于提供一种9％Ni储罐钢用药芯气保焊丝使用方法，采用100％CO 2或80％Ar+20％CO 2的混合气进行气体保护，气体流量为18～20L/min；焊接前不需要预热，焊接过程中保证层温处于50～80℃；焊接时，第1层焊接电流为135～145A，电压为20.6～20.8V，焊速为14～15cm/min；第2层焊接电流为145～155A，电压为22.8～23.9V，焊速为15～16cm/min；第3层焊接电流为160～170A，电压为23.5～23.8V，焊速为18～20cm/min；后续焊接与第3层焊接参数相同。 The third object of the present invention is to provide a method of using flux-cored gas shielded welding wire for 9% Ni storage tank steel, using a mixed gas of 100% CO 2 or 80% Ar+20% CO 2 for gas protection, and the gas flow rate is 18~ 20L/min; no preheating is required before welding, and the layer temperature must be between 50 and 80°C during the welding process; during welding, the first layer welding current is 135~145A, the voltage is 20.6~20.8V, and the welding speed is 14~15cm/ min; the second layer welding current is 145~155A, the voltage is 22.8~23.9V, the welding speed is 15~16cm/min; the third layer welding current is 160~170A, the voltage is 23.5~23.8V, the welding speed is 18~ 20cm/min; subsequent welding parameters are the same as those of the third layer.
前所述的一种9％Ni储罐钢用药芯气保焊丝使用方法，应用于罐体侧板立焊位置和其他位置的仰焊。The aforementioned method of using flux-cored gas shielded welding wire for 9% Ni storage tank steel is applied to the vertical welding position of the tank side plate and the overhead welding in other positions.
本发明的有益效果是：The beneficial effects of the present invention are:
(1)本发明中药粉的金红石含量为18％～26％，锆英砂含量为3％～5％，能调节熔渣熔点和熔池液体黏度；焊接过程会形成一层较薄的保护渣，减少焊缝金属的气孔敏感性，保证了焊缝探伤质量；添加量低于设计值时，作用不明显， 添加量高于上限时，会恶化焊缝金属成型性；(1) The rutile content of the traditional Chinese medicine powder of the present invention is 18% to 26%, and the zircon sand content is 3% to 5%, which can adjust the melting point of the slag and the viscosity of the molten pool liquid; a thin layer of protective slag will be formed during the welding process , reduce the pore sensitivity of the weld metal and ensure the quality of weld flaw detection; when the addition amount is lower than the design value, the effect is not obvious; when the addition amount is higher than the upper limit, the formability of the weld metal will be deteriorated;
(2)本发明中药粉的钛酸钾含量为3％～5％，起到稳定电弧的作用，提高了焊接工艺性能；(2) The potassium titanate content of the traditional Chinese medicine powder of the present invention is 3% to 5%, which stabilizes the arc and improves the performance of the welding process;
(3)本发明中药粉的Co为0.01％～0.02％，Co能够起到细化晶粒的作用，提高焊缝金属的强度和韧性，但由于Co价格昂贵，少量添加能满足一定的需求，添加量过多会使成本大幅增加；(3) Co in the traditional Chinese medicine powder of the present invention is 0.01% to 0.02%. Co can refine the grains and improve the strength and toughness of the weld metal. However, because Co is expensive, adding a small amount can meet certain needs. Adding too much will significantly increase the cost;
(4)本发明中药粉中的Al为0.02％～0.04％，Al能够与Ni、Mo、Fe结合生成Ni 3Al、Mo 3Al、Fe 3Al强化焊缝保证屈服与抗拉强度，添加量过多时会导致脆性加大； (4) Al in the traditional Chinese medicine powder of the present invention is 0.02% to 0.04%. Al can combine with Ni, Mo, and Fe to form Ni 3 Al, Mo 3 Al, and Fe 3 Al to strengthen the weld and ensure yield and tensile strength. The added amount Too much will lead to increased brittleness;
(5)本发明中采用钢带与药粉共同过渡合金元素的方式，形成的焊缝金属中，其Ni含量为66％～68％，Ni元素具有优异的低温冲击韧性，含量过高会造成成本增加，含量过低会影响焊缝的低温冲击性能，本发明钢带中Ni为10.15％～12.03％，药粉中Ni含量为56.08％～60.41％，经焊接烧损后，仍能保有一定量的Ni元素，保证了焊缝全奥氏体组织，获得良好的超低温韧性；在形成焊接接头时，避免了母材对焊缝稀释扩散，熔合线附近组织与性能变化造成低温韧性下降，保证了焊缝金属被母材稀释后成分仍能满足-196℃的低温冲击韧性需求；(5) In the present invention, the steel strip and the powder are used to transfer alloy elements together. The Ni content in the formed weld metal is 66% to 68%. The Ni element has excellent low-temperature impact toughness. Too high content will cause costs. If the content is too low, it will affect the low-temperature impact performance of the weld. The Ni content in the steel strip of the present invention is 10.15% ~ 12.03%, and the Ni content in the powder is 56.08% ~ 60.41%. After welding and burning, a certain amount of Ni can still be retained. Ni element ensures the full austenitic structure of the weld and obtains good ultra-low temperature toughness; when forming the weld joint, it avoids the dilution and diffusion of the base metal to the weld, and the decrease in low-temperature toughness caused by changes in the structure and properties near the fusion line, ensuring the welding After the seam metal is diluted by the base material, the composition can still meet the low-temperature impact toughness requirements of -196°C;
(6)本发明中钢带的Ni为10.15％～12.03％，因药芯焊丝具有吸潮性，在钢带中添加一定量的Ni能够有效防止焊丝生锈，延长保存时间；(6) The Ni content of the steel strip in the present invention is 10.15% to 12.03%. Since the flux-cored welding wire has moisture absorption, adding a certain amount of Ni to the steel strip can effectively prevent the welding wire from rusting and extend the storage time;
(7)本发明中钢带P≤0.002％和S≤0.001％，杂质元素P与S易使焊缝金属产生液化裂纹与再热裂纹，因此需通过净化钢水，将钢带的P和S含量降到最低，避免因P、S偏聚而产生热裂纹倾向，保证了良好的焊缝金属质量；(7) In the steel strip of the present invention, P ≤ 0.002% and S ≤ 0.001%. The impurity elements P and S can easily cause liquefaction cracks and reheat cracks in the weld metal. Therefore, it is necessary to purify the molten steel to reduce the P and S content of the steel strip. Minimize it to avoid hot cracking tendency due to P and S segregation, ensuring good weld metal quality;
(8)本发明中焊接方法对于焊材的使用至关重要，采用100％CO 2气体可以正常使用，采用80％Ar+20％CO 2的混合气能够减少焊接时的飞溅，提高冲击韧性；焊接过程中保证层温处于50～80℃，防止金属元素过烧和冷却速度过慢导致的 Al元素在熔池中过度上浮； (8) The welding method in the present invention is crucial to the use of welding materials. The use of 100% CO 2 gas can be used normally, and the use of a mixed gas of 80% Ar+20% CO 2 can reduce spatter during welding and improve impact toughness; During the welding process, ensure that the layer temperature is between 50 and 80°C to prevent excessive floating of Al elements in the molten pool caused by over-burning of the metal elements and slow cooling rate;
(9)本发明中焊接参数设置有效控制了与母材的熔合比，减少母材的热影响区宽度，确保接头性能。(9) The welding parameter setting in the present invention effectively controls the fusion ratio with the base metal, reduces the width of the heat-affected zone of the base metal, and ensures joint performance.
具体实施方式Detailed ways
实施例1Example 1
本实施例提供的一种9％Ni储罐钢用药芯气保焊丝，由62％的钢带与38％的药粉组成。This embodiment provides a flux-cored gas shielded welding wire for 9% Ni storage tank steel, which is composed of 62% steel strip and 38% powder.
钢带的化学组分是：C为0.016％，Si为0.51％，Mn为0.57％，Cr为3.15％，Ni为10.15％，P≤0.002％，S≤0.001％，余量为Fe和不可避免的杂质。The chemical composition of the steel strip is: C is 0.016%, Si is 0.51%, Mn is 0.57%, Cr is 3.15%, Ni is 10.15%, P≤0.002%, S≤0.001%, the balance is Fe and unavoidable of impurities.
药粉的化学组分是：金红石为18％，锆英砂为5％，钛酸钾为3％，电解锰为4％，镍粉为60.41％，钼粉为10.40％，钴粉为0.01％～0.02％，铝粉为0.02％～0.04％，高碳铬铁为24.64％，余量为铁粉。The chemical composition of the powder is: 18% rutile, 5% zircon sand, 3% potassium titanate, 4% electrolytic manganese, 60.41% nickel powder, 10.40% molybdenum powder, and 0.01% cobalt powder. 0.02%, aluminum powder is 0.02% to 0.04%, high carbon ferrochrome is 24.64%, and the balance is iron powder.
金红石、锆英砂、钛酸钾、电解锰、镍粉、钼粉、钴粉、铝粉的纯度≥99％，粒度≤0.3mm。高碳铬铁的化学成分：Cr：84％～86％，C：10％～12％，余量为铁和不可避免的杂质，粒度≤0.3mm。The purity of rutile, zircon sand, potassium titanate, electrolytic manganese, nickel powder, molybdenum powder, cobalt powder, and aluminum powder is ≥99%, and the particle size is ≤0.3mm. The chemical composition of high carbon ferrochrome: Cr: 84% ~ 86%, C: 10% ~ 12%, the balance is iron and inevitable impurities, the particle size is ≤0.3mm.
制备方法：采用常规药芯焊丝制备方法，将所述钢带轧制成U形管，再将所述药粉加入U形管中，然后合缝，拉丝减径，收线，表面处理，层绕，制得直径为1.2mm的9％Ni储罐钢用药芯气保焊丝。Preparation method: Use conventional flux-cored wire preparation methods to roll the steel strip into a U-shaped tube, then add the powder into the U-shaped tube, then seam, wire drawing, diameter reduction, wire take-up, surface treatment, and layer winding. , to prepare flux cored gas shielded welding wire for 9% Ni storage tank steel with a diameter of 1.2mm.
用于20mm厚罐体侧板立焊，采用100％CO 2的混合气进行气体保护，气体流量为18～20L/min。焊接前不需要预热，焊接过程中保证层温处于50～80℃。焊接时，第1层焊接电流为135～145A，电压为20.6～20.8V，焊速为14～15cm/min；第2层焊接电流为145～155A，电压为22.8～23.9V，焊速为15～16cm/min；第3层焊接电流为160～170A，电压为23.5～23.8V，焊速为18～20cm/min；后续焊接与第3层焊接参数相同。 Used for vertical welding of 20mm thick tank side plates, using 100% CO 2 mixed gas for gas protection, with a gas flow rate of 18-20L/min. There is no need to preheat before welding, and the layer temperature must be between 50 and 80°C during the welding process. When welding, the first layer welding current is 135~145A, the voltage is 20.6~20.8V, and the welding speed is 14~15cm/min; the second layer welding current is 145~155A, the voltage is 22.8~23.9V, and the welding speed is 15 ~16cm/min; the third layer welding current is 160~170A, the voltage is 23.5~23.8V, the welding speed is 18~20cm/min; subsequent welding parameters are the same as the third layer welding parameters.
接头要求Rm≥690MPa，弯曲裂纹率≤20％，-196℃下AKv≥47J。对接头进行力学性能检测，抗拉强度为721MPa、726MPa，弯曲存在0.5mm裂纹，-196℃下各位置AKv为表1所示，The joint requirements are Rm≥690MPa, bending crack rate ≤20%, and AKv≥47J at -196℃. The mechanical properties of the joint were tested. The tensile strength was 721MPa and 726MPa. There was a 0.5mm crack in bending. The AKv at each position at -196°C is as shown in Table 1.
表1实施例1接头冲击试验结果Table 1 Example 1 joint impact test results
Figure PCTCN2022105610-appb-000001
Figure PCTCN2022105610-appb-000001
该药芯气保焊丝满足使用要求。This flux cored gas shielded welding wire meets the usage requirements.
实施例2Example 2
本实施例提供的一种9％Ni储罐钢用药芯气保焊丝，与实施例1的区别在于，由65％的钢带与35％的药粉组成。This embodiment provides a flux-cored gas-shielded welding wire for 9% Ni storage tank steel. The difference from Embodiment 1 is that it is composed of 65% steel strip and 35% powder.
钢带的化学组分是：C为0.025％，Si为0.63％，Mn为0.43％，Cr为4.67％，Ni为11.08％，P≤0.002％，S≤0.001％，余量为Fe和不可避免的杂质。The chemical composition of the steel strip is: C is 0.025%, Si is 0.63%, Mn is 0.43%, Cr is 4.67%, Ni is 11.08%, P≤0.002%, S≤0.001%, the balance is Fe and unavoidable of impurities.
药粉的化学组分是：金红石为22％，锆英砂为4％，钛酸钾为4％，电解锰为3％，镍粉为58.22％，钼粉为11.34％，钴粉为0.01％～0.02％，铝粉为0.02％～0.04％，高碳铬铁为23.72％，余量为铁粉。The chemical composition of the powder is: 22% rutile, 4% zircon sand, 4% potassium titanate, 3% electrolytic manganese, 58.22% nickel powder, 11.34% molybdenum powder, and 0.01% cobalt powder. 0.02%, aluminum powder is 0.02% to 0.04%, high carbon ferrochrome is 23.72%, and the balance is iron powder.
用于18mm厚罐体侧板立焊，采用80％Ar+20％CO 2的混合气进行气体保护，气体流量为18～20L/min。焊接前不需要预热，焊接过程中保证层温处于50～80℃。焊接时，第1层焊接电流为135～145A，电压为20.6～20.8V，焊速为14～15cm/min；第2层焊接电流为145～155A，电压为22.8～23.9V，焊速为15～16cm/min；第3层焊接电流为160～170A，电压为23.5～23.8V，焊速为18～20cm/min；后续焊接与第3层焊接参数相同。 Used for vertical welding of 18mm thick tank side plates, using a mixed gas of 80% Ar+20% CO 2 for gas protection, with a gas flow rate of 18-20L/min. There is no need to preheat before welding, and the layer temperature must be between 50 and 80°C during the welding process. When welding, the first layer welding current is 135~145A, the voltage is 20.6~20.8V, and the welding speed is 14~15cm/min; the second layer welding current is 145~155A, the voltage is 22.8~23.9V, and the welding speed is 15 ~16cm/min; the third layer welding current is 160~170A, the voltage is 23.5~23.8V, the welding speed is 18~20cm/min; subsequent welding parameters are the same as the third layer welding parameters.
接头要求Rm≥690MPa，弯曲裂纹率≤20％，-196℃下AKv≥47J。对接头进行力学性能检测，抗拉强度为701MPa、712MPa，弯曲无裂纹，-196℃下各位置 AKv为表2所示，The joint requirements are Rm≥690MPa, bending crack rate ≤20%, and AKv≥47J at -196℃. The mechanical properties of the joint were tested. The tensile strength was 701MPa and 712MPa, and there were no cracks in bending. The AKv of each position at -196°C is as shown in Table 2.
表2实施例二接头冲击试验结果Table 2 Example 2 joint impact test results
Figure PCTCN2022105610-appb-000002
Figure PCTCN2022105610-appb-000002
该药芯气保焊丝满足使用要求。This flux cored gas shielded welding wire meets the usage requirements.
实施例2Example 2
本实施例提供的一种9％Ni储罐钢用药芯气保焊丝，与实施例1的区别在于，由68％的钢带与32％的药粉组成。This embodiment provides a flux-cored gas-shielded welding wire for 9% Ni storage tank steel. The difference from Embodiment 1 is that it is composed of 68% steel strip and 32% powder.
钢带的化学组分是：C为0.031％，Si为0.70％，Mn为0.29％，Cr为5.03％，Ni为12.03％，P≤0.002％，S≤0.001％，余量为Fe和不可避免的杂质。The chemical composition of the steel strip is: C is 0.031%, Si is 0.70%, Mn is 0.29%, Cr is 5.03%, Ni is 12.03%, P≤0.002%, S≤0.001%, the balance is Fe and unavoidable of impurities.
药粉的化学组分是：金红石为26％，锆英砂为3％，钛酸钾为5％，电解锰为2％，镍粉为56.08％，钼粉为10.40％，钴粉为0.01％～0.02％，铝粉为0.02％～0.04％，高碳铬铁为22.62％，余量为铁粉。The chemical composition of the powder is: 26% rutile, 3% zircon sand, 5% potassium titanate, 2% electrolytic manganese, 56.08% nickel powder, 10.40% molybdenum powder, and 0.01% cobalt powder. 0.02%, aluminum powder is 0.02% to 0.04%, high carbon ferrochrome is 22.62%, and the balance is iron powder.
用于27.5mm厚罐体侧板立焊，采用80％Ar+20％CO 2的混合气进行气体保护，气体流量为18～20L/min。焊接前不需要预热，焊接过程中保证层温处于50～80℃。焊接时，第1层焊接电流为135～145A，电压为20.6～20.8V，焊速为14～15cm/min；第2层焊接电流为145～155A，电压为22.8～23.9V，焊速为15～16cm/min；第3层焊接电流为160～170A，电压为23.5～23.8V，焊速为18～20cm/min；后续焊接与第3层焊接参数相同。 Used for vertical welding of 27.5mm thick tank side plates, using a mixed gas of 80% Ar+20% CO 2 for gas protection, with a gas flow rate of 18-20L/min. There is no need to preheat before welding, and the layer temperature must be between 50 and 80°C during the welding process. When welding, the first layer welding current is 135~145A, the voltage is 20.6~20.8V, and the welding speed is 14~15cm/min; the second layer welding current is 145~155A, the voltage is 22.8~23.9V, and the welding speed is 15 ~16cm/min; the third layer welding current is 160~170A, the voltage is 23.5~23.8V, the welding speed is 18~20cm/min; subsequent welding parameters are the same as the third layer welding parameters.
接头要求Rm≥690MPa，弯曲裂纹率≤20％，-196℃下AKv≥47J。对接头进行力学性能检测，抗拉强度为707MPa、695MPa，弯曲无裂纹，-196℃下各位置AKv为表3所示，The joint requirements are Rm≥690MPa, bending crack rate ≤20%, and AKv≥47J at -196℃. The mechanical properties of the joint were tested. The tensile strength was 707MPa and 695MPa, and there were no cracks in bending. The AKv at each position at -196°C is as shown in Table 3.
表3实施例三接头冲击试验结果Table 3 Example three joint impact test results
Figure PCTCN2022105610-appb-000003
Figure PCTCN2022105610-appb-000003
该药芯气保焊丝满足使用要求。This flux cored gas shielded welding wire meets the usage requirements.
除上述实施例外，本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案，均落在本发明要求的保护范围。In addition to the above embodiments, the present invention may also have other embodiments. Any technical solution formed by equivalent substitution or equivalent transformation falls within the protection scope of the present invention.

Claims (6)

  1. 一种9％Ni储罐钢用药芯气保焊丝，其特征在于：包括62％～68％的钢带与32％～38％的药粉，A flux cored gas shielded welding wire for 9% Ni storage tank steel, which is characterized by: including 62% to 68% steel strip and 32% to 38% powder.
    钢带的化学组分：C：0.016％～0.031％，Si：0.51％～0.70％，Mn：0.29％～0.57％，Cr：3.15％～5.03％，Ni：10.15％～12.03％，P≤0.002％，S≤0.001％，余量为Fe和不可避免的杂质；Chemical composition of steel strip: C: 0.016% ~ 0.031%, Si: 0.51% ~ 0.70%, Mn: 0.29% ~ 0.57%, Cr: 3.15% ~ 5.03%, Ni: 10.15% ~ 12.03%, P ≤ 0.002 %, S≤0.001%, the balance is Fe and inevitable impurities;
    药粉的化学组分：金红石：18％～26％，锆英砂：3％～5％，钛酸钾：3％～5％，电解锰：2％～4％，镍粉：56.08％～60.41％，钼粉：10.40％～12.68％，钴粉：0.01％～0.02％，铝粉：0.02％～0.04％，高碳铬铁：22.62％～24.64％，余量为铁粉。The chemical composition of the powder: rutile: 18% ~ 26%, zircon sand: 3% ~ 5%, potassium titanate: 3% ~ 5%, electrolytic manganese: 2% ~ 4%, nickel powder: 56.08% ~ 60.41 %, molybdenum powder: 10.40% ~ 12.68%, cobalt powder: 0.01% ~ 0.02%, aluminum powder: 0.02% ~ 0.04%, high carbon ferrochrome: 22.62% ~ 24.64%, the balance is iron powder.
  2. 根据权利要求1所述的一种9％Ni储罐钢用药芯气保焊丝，其特征在于：所述金红石、锆英砂、钛酸钾、电解锰、镍粉、钼粉、钴粉、铝粉的纯度≥99％，粒度≤0.3mm。A flux cored gas shielded welding wire for 9% Ni storage tank steel according to claim 1, characterized in that: the rutile, zircon sand, potassium titanate, electrolytic manganese, nickel powder, molybdenum powder, cobalt powder, aluminum The purity of the powder is ≥99% and the particle size is ≤0.3mm.
  3. 根据权利要求1所述的一种9％Ni储罐钢用药芯气保焊丝，其特征在于：所述高碳铬铁的化学成分：Cr：84％～86％，C：10％～12％，余量为铁和不可避免的杂质，粒度≤0.3mm。A flux cored gas shielded welding wire for 9% Ni storage tank steel according to claim 1, characterized in that: the chemical composition of the high carbon ferrochromium: Cr: 84% to 86%, C: 10% to 12% , the balance is iron and inevitable impurities, the particle size is ≤0.3mm.
  4. 一种9％Ni储罐钢用药芯气保焊丝制备方法，其特征在于：应用于权利要求1-3任意一项，采用常规药芯焊丝制备方法，将钢带轧制成U形管，再将药粉加入U形管中，然后合缝、拉丝减径、收线、表面处理、层绕，制得直径为1.2mm的9％Ni储罐钢用药芯气保焊丝。A method for preparing flux-cored gas shielded welding wire for 9% Ni storage tank steel, which is characterized in that: applied to any one of claims 1-3, using a conventional flux-cored welding wire preparation method, rolling the steel strip into a U-shaped tube, and then Add the powder into the U-shaped tube, then seam, draw and reduce the diameter, take up the wire, surface treatment, and layer winding to prepare a flux-cored gas-shielded welding wire with a diameter of 1.2 mm for 9% Ni storage tank steel.
  5. 一种9％Ni储罐钢用药芯气保焊丝使用方法，其特征在于：应用于权利要求1-4任意一项，采用100％CO 2或80％Ar+20％CO 2的混合气进行气体保护，气体流量为18～20L/min；焊接前不需要预热，焊接过程中保证层温处于50～80℃；焊接时，第1层焊接电流为135～145A，电压为20.6～20.8V，焊速为14～15cm/min；第2层焊接电流为145～155A，电压为22.8～23.9V，焊速为15～16cm/min；第3层焊接电流为160～170A，电压为23.5～23.8V，焊速为18～20cm/min；后续焊接与第3层焊接参数相同。 A method of using flux-cored gas shielded welding wire for 9% Ni storage tank steel, which is characterized in that: applied to any one of claims 1-4, using a mixed gas of 100% CO 2 or 80% Ar+20% CO 2 for gas Protection, the gas flow is 18~20L/min; no preheating is required before welding, and the layer temperature is guaranteed to be 50~80℃ during the welding process; during welding, the first layer welding current is 135~145A, and the voltage is 20.6~20.8V. The welding speed is 14~15cm/min; the second layer welding current is 145~155A, the voltage is 22.8~23.9V, the welding speed is 15~16cm/min; the third layer welding current is 160~170A, the voltage is 23.5~23.8 V, the welding speed is 18~20cm/min; subsequent welding parameters are the same as those of the third layer.
  6. 根据权利要求5所述的一种9％Ni储罐钢用药芯气保焊丝使用方法，其特征在于：应用于罐体侧板立焊位置和其他位置的仰焊。A method of using flux-cored gas shielded welding wire for 9% Ni storage tank steel according to claim 5, characterized in that it is applied to the vertical welding position of the tank side plate and the overhead welding at other positions.
PCT/CN2022/105610 2022-04-01 2022-07-14 Flux-cored gas shielded welding wire for 9% ni steel used for storage tanks, and preparation method and use method therefor WO2023184787A1 (en)

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