CN107971657B - Gas shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation container and equipment - Google Patents
Gas shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation container and equipment Download PDFInfo
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- CN107971657B CN107971657B CN201711202805.4A CN201711202805A CN107971657B CN 107971657 B CN107971657 B CN 107971657B CN 201711202805 A CN201711202805 A CN 201711202805A CN 107971657 B CN107971657 B CN 107971657B
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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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- 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
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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Abstract
The invention discloses a gas-shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment and a preparation method thereof, wherein the gas-shielded flux-cored wire comprises a steel strip and a flux core wrapped in the steel strip, and the flux core comprises the following components of 4.25-5.85 parts by weight of natural rutile, 0.8-1.9 parts by weight of quartz sand, 0.7-1.8 parts by weight of sodium titanate, 0.25-0.3 part by weight of sodium fluoride, 0.125-0.275 part by weight of calcined α aluminum oxide, 0.025-0.15 part by weight of ferrochrome nitride, 0.085-0.05 part by weight of sprayed silicon iron, 1.05-1.45 parts by weight of electrolytic manganese, 3.6-4.85 parts by weight of metal chromium, 6.42-6.85 parts by weight of atomized iron powder, 1.9-2.5 parts by weight of nickel powder and 1.0-1.35 parts by weight of molybdenum iron.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a gas-shielded flux-cored wire which simultaneously meets the corresponding technical requirements of E316LT1-1 type flux-cored wires in GB/T17853 standard and AWSA5.22 standard, has higher strength and excellent low-temperature plasticity and toughness under the condition of low temperature and low temperature, and is mainly used for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment (LNG storage tanks, LNG transport ships, LNG satellite stations, LNG tank trucks, ultralow-temperature refrigerators, ultralow-temperature refrigeration equipment and the like) and a production process thereof.
Background
SUS316L steel is a commonly used austenitic stainless steel, and is widely used in LNG industry due to its good comprehensive properties, and the cryogenic welding material matched with SUS316L is mainly a manual welding rod and a solid welding wire.
The flux-cored wire has the advantages of high efficiency, semi-automatic and automatic welding technology, high deposition efficiency, low splashing, attractive appearance, wide welding current and voltage adaptability and the like, and has good application prospect in the LNG industry. Therefore, the development of the flux-cored wire suitable for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment has extremely high practical and strategic value as technical stock or production application.
CN106624450A discloses an ultra supercritical heat resistant steel flux-cored wire and a preparation method thereof, wherein the flux-cored wire comprises a sheath and a flux core, the sheath is a low-carbon steel thin strip, and the flux core comprises the following components in percentage by mass: 3-5% of graphite powder, 35-50% of metal chromium, 20-40% of rutile, 3-8% of ferromolybdenum, 3-8% of ferromanganese powder, 1-8% of nickel powder, 2-8% of feldspar, 1-5% of ferrovanadium, 1-5% of ferroniobium, 0.2-2% of fluoride and the balance of iron powder and inevitable impurities; wherein the weight of the flux core accounts for 10-30% of the total weight of the welding wire. CN105269174A also discloses a 460MPa grade flux-cored wire for ocean engineering and an application and a preparation method thereof, wherein the flux-cored wire comprises a carbon steel sheath and a flux core, the carbon steel sheath accounts for 84-87% of the total mass of the flux-cored wire, the flux core accounts for 13-16% of the total mass of the flux-cored wire, and the flux core comprises the following components in percentage by mass: rutile: 30-42%, sodium fluoride: 1-2%, feldspar: 3-6%, ferrotitanium: 3-5%, ferrosilicon: 1-3%, rare earth: 0.5-1%, magnesium powder: 3-5%, electrolytic manganese: 5-10%, aluminum powder: 1-2%, nickel powder: 7-9%, ferroboron: 4-7%, graphite: 0.2-0.5%, silicon manganese alloy: 3-6%, zircon sand: 0.5 to 1%, and the balance of Fe and inevitable impurities. CN105728989A discloses a high-toughness atmospheric corrosion-resistant flux-cored wire and a preparation method thereof, the flux-cored wire is prepared from a carbon steel cold-rolled steel strip and a flux core, and the flux core comprises the following components in percentage by mass: 25-40% of rutile, 3-7% of quartz sand, 1-3% of magnesia, 3-12% of aluminosilicate, 1-4% of sodium fluoride, 1-3% of sodium oxide, 5-15% of low-carbon ferromanganese, 3-7% of ferrosilicon and the like. CN106475706A discloses a coating-free weather-proof flux-cored wire for bridge steel, which consists of a steel sheath and a powder core, wherein the powder core comprises the following components: 2-8 wt% of ferroboron, 0.01-2 wt% of ferromolybdenum, 1-6 wt% of fluoride, 1.5-8 wt% of zircon sand, 2-7 wt% of magnesium powder, 2-5 wt% of quartz sand, 2-8 wt% of ferrosilicon, 5-19 wt% of electrolytic manganese, 1-5 wt% of ferromanganese, 1-6 wt% of nickel powder, 1-8 wt% of metallic chromium, 1-8 wt% of copper powder, 2-9 wt% of ferrotitanium, 0.1-5 wt% of feldspar, 2-8 wt% of sodium titanate and 20-40 wt% of rutile, and the balance being iron powder. However, the welding wires of the four patents are used for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment, and have the following defects:
the flux-cored wire is applicable to heat-resistant steel under high-temperature conditions in CN 106624450A; the sheath steel strip is a low-carbon steel strip; the deposited metal has good heat strength performance, high-temperature corrosion resistance and oxidation resistance, and the specific mechanical properties are as follows: the tensile strength is more than or equal to 620Mpa, the yield strength is more than or equal to 540Mpa, the elongation is more than or equal to 16 percent, and the impact at 20 ℃ reaches 40J. If the patent is used for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment, the defects that the chemical components of weld deposit metal, tensile strength and base metal are not matched, and the elongation, ultralow temperature impact energy and intercrystalline corrosion resistance do not reach the standard exist.
The flux-cored wire is suitable for 460MPa grade ocean engineering steel in CN 105269174A; the outer-skin steel strip is a carbon steel strip; the metallurgical structure of the deposited metal is ferrite and a small amount of pearlite. If the method is used for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment, the defects that the chemical components and tensile strength of weld deposit metal are not matched with those of parent metal, and the ultralow-temperature impact energy and intercrystalline corrosion resistance do not reach the standard exist.
The flux-cored wire is suitable for low-temperature atmospheric corrosion resistant steel; the outer-skin steel strip is a carbon steel strip; the deposited metal is mainly characterized by low-temperature toughness at minus 40 ℃ and excellent atmospheric corrosion resistance. If the method is used for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment, the defects that the chemical components and tensile strength of weld deposit metal are not matched with those of parent metal, and the ultralow-temperature impact energy and intercrystalline corrosion resistance do not reach the standard exist.
The flux-cored wire is suitable for bridge steel in CN 106475706A; the outer skin is a carbon steel strip; the molten metal is characterized by coating-free and atmospheric corrosion resistance, and has the specific chemical properties of tensile strength of more than or equal to 400Mpa, yield strength of more than or equal to 510Mpa, elongation of more than or equal to 22 percent, impact at 40 ℃ of more than or equal to 80J and atmospheric corrosion resistance index I of more than or equal to 6.5. If the method is used for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment, the defects that the chemical components and tensile strength of weld deposit metal are not matched with those of parent metal, and the ultralow-temperature impact energy and intercrystalline corrosion resistance do not reach the standard exist.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment and a production process thereof.
The invention discloses a gas shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment.
The technical scheme is as follows: a gas shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment comprises a steel strip and a flux core wrapped in the steel strip, wherein the flux core comprises the following components:
4.25-5.85 parts of natural rutile, 0.8-1.9 parts of quartz sand, 0.7-1.8 parts of sodium titanate, 0.25-0.3 part of sodium fluoride, 0.125-0.275 part of calcined α aluminum oxide, 0.025-0.15 part of ferrochromium nitride, 0.085-0.05 part of spray ferrosilicon, 1.05-1.45 parts of electrolytic manganese, 3.6-4.85 parts of metallic chromium, 6.42-6.85 parts of atomized iron powder, 1.9-2.5 parts of nickel powder and 1.0-1.35 parts of ferromolybdenum.
Preferably, the steel strip is an ultra-low carbon stainless steel strip, and comprises the following components: less than or equal to 0.015 wt% of C, less than or equal to 2.0 wt% of Mn, less than or equal to 0.75 wt% of Si, 16.0-20.0 wt% of Cr and 10.0-14.0 wt% of Ni; less than or equal to 0.10 wt% of Cu, less than or equal to 0.005 wt% of S, less than or equal to 0.016 wt% of P, less than or equal to 0.10 wt% of N, 2.0-3.0 wt% of Mo, and the balance of Fe and inevitable impurities.
Preferably, the alloy comprises 0.0093 wt% of C, 1.16 wt% of Mn, 0.32 wt% of Si, 18.65 wt% of Cr, 10.84wt% of Ni, 0.006 wt% of Cu, 0.003 wt% of S, 0.011 wt% of P, 0.021 wt% of N, 2.55 wt% of Mo, and the balance of Fe and inevitable impurities.
Preferably, the natural rutile is TiO-containing296.52 wt%, S0.022 wt%, P0.027 wt% natural rutile, and quartz sand containing SiO299.4wt％、Al2O30.33 wt%, S0.019 wt% and P0.023 wt% of quartz sand, and sodium titanate is TiO-containing272.7wt％、NaO216.8 wt%, S0.025 wt%, P0.034 wt%, and NaF99.6 wt% in sodium fluorideCalcining α the alumina to Al-containing2O398.2 wt%, S is less than or equal to 0.017 wt%, P is less than or equal to 0.24 wt% of calcined α aluminum oxide, the chromium iron nitride is the chromium iron nitride containing 62.4 wt%, N7.4 wt%, C0.044 wt%, S0.023 wt% and P0.027 wt%, the spray ferrosilicon is the spray ferrosilicon containing 45.0 wt%, C0.087 wt%, S0.011 wt% and P0.031 wt%, the electrolytic manganese is the electrolytic manganese containing Mn 99.7 wt%, C0.035 wt%, S0.017 wt% and P0.017wt%, the metallic chromium is the atomized iron powder containing Cr 98.9 wt%, C0.012 wt%, S0.016 wt% and P0.008 wt%, the atomized iron powder is the atomized iron powder containing Fe 98.9 wt%, C0.026 wt%, S0.008 wt% and P0.011 wt% and P0.61 wt%, the nickel powder containing Ni99.7 wt%, C0.008 wt%, S0.007 wt%, S0.011 wt% and P0.040.61 wt%.
Preferably, the raw materials comprise 5.85 parts by weight of natural rutile, 0.8 part by weight of quartz sand, 1.3 parts by weight of sodium titanate, 0.25 part by weight of sodium fluoride, 0.125 part by weight of calcined α alumina, 0.025 part by weight of ferrochrome, 0.05 part by weight of sprayed ferrosilicon, 1.05 parts by weight of electrolytic manganese, 4.25 parts by weight of metallic chromium, 6.65 parts by weight of atomized iron powder, 1.9 parts by weight of nickel powder and 1.15 parts by weight of ferromolybdenum.
Preferably, the alloy comprises, by weight, 4.9 parts of natural rutile, 1.2 parts of quartz sand, 0.7 part of sodium titanate, 0.25 part of sodium fluoride, 0.21 part of calcined α aluminum oxide, 0.15 part of ferrochrome nitride, 0.04 part of sprayed ferrosilicon, 1.45 parts of electrolytic manganese, 4.85 parts of metallic chromium, 6.85 parts of atomized iron powder, 1.9 parts of nickel powder, 1.0 part of ferromolybdenum, or 4.25 parts of natural rutile, 1.9 parts of quartz sand, 1.8 parts of sodium titanate, 0.3 part of sodium fluoride, 0.275 parts of calcined α aluminum oxide, 0.12 part of ferrochrome nitride, 0.085 part of sprayed ferrosilicon, 1.4 parts of electrolytic manganese, 3.6 parts of metallic chromium, 6.42 parts of atomized iron powder, 2.5 parts of nickel powder and 1.35 parts of ferromolybdenum.
The invention discloses a preparation method of a gas shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment.
The technical scheme is as follows: the preparation method of the gas shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment adopts precise forming, precise drawing and reducing, surface treatment and close-packed layer winding.
Preferably, the method specifically comprises the steps of uniformly mixing the components of the flux core, keeping the temperature for 2-4 hours at 200-250 ℃, uniformly stirring, wrapping the flux core in an ultra-low carbon stainless steel band by adopting a precision forming process, accurately drawing and reducing the diameter to a specified diameter of the welding wire through pure CRD, carrying out online annealing to eliminate work hardening, carbonizing oil stains on the surface of the welding wire, cleaning, uniformly coating a layer of lubricant on the surface of the welding wire to ensure the wire feeding performance of the welding wire, and finally winding the welding wire into the flux-cored welding wire through a dense layer.
The invention discloses a welding method.
The technical scheme is as follows: the welding method adopts the gas shielded flux-cored wire for welding the SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation container and equipment, and the welding wire is matched with the SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation container and equipment for use.
The invention principle and the beneficial effects are as follows:
in the invention, the components have the following functions:
the rutile powder mainly has the effects of stabilizing electric arcs and slagging, and can adjust the melting point, viscosity, surface tension and fluidity of molten slag, improve weld joint forming and reduce splashing. The rutile powder added in the invention plays a key role in weld forming and electric arc stability. The quartz sand mainly has the functions of slagging and adjusting the pH value, viscosity, surface tension and fluidity of the slag. The sodium titanate mainly has the function of providing sodium oxide for slagging, and the sodium oxide has a lower melting point and can balance the solidification temperature and the surface tension of the molten slag. The main function of sodium fluoride is to remove hydrogen and improve the processing properties of the wire. The ferrochromium nitride is mainly used for transferring nitrogen elements into the welding seam to improve the tensile strength of the welding seam. The sprayed ferrosilicon is used for transferring silicon elements into the welding seam, so that the effects of reduction and deoxidation are achieved, and the elastic limit, yield point and tensile strength of the welding seam can be improved. The electrolytic manganese is a main deoxidizer and desulfurizer in the flux core, and can improve the quenching property of the welding line and the hot working property. The main function of the metal chromium is to transition chromium element into the welding seam to improve the oxidation resistance and corrosion resistance of the welding seam. The nickel powder has the main functions of transferring nickel elements into the welding line, improving the plasticity and toughness of the welding line and keeping the antirust and heat-resistant performances at high temperature.
In order to ensure that the welding performance of the flux-cored wire meets the requirements and is more excellent, the flux-cored wire needs to meet the following requirements for each component: natural rutile is TiO-containing296.52 wt%, S0.022 wt%, P0.027 wt% natural rutile, and quartz sand containing SiO299.4wt％、Al2O30.33 wt%, S0.019 wt% and P0.023 wt% of quartz sand, and sodium titanate containing TiO272.7wt% and NaO216.8 wt%, S0.025 wt%, P0.034 wt%, sodium titanate, sodium fluoride being NaF99.6 wt%, calcined α alumina being calcined α alumina containing Al2O398.2wt%, S0.017 wt%, P0.24 wt%, chromium iron nitride being sprayed with sprayed iron-silicon containing Cr62.4 wt%, N7.4wt%, C0.044wt%, S0.023 wt%, P0.027 wt%, chromium iron nitride containing Si 45.0 wt%, C0.087 wt%, S0.011 wt%, P0.031 wt%, electrolytic manganese being Mn 99.7 wt%, C0.035 wt%, S0.017 wt%, P0.017 wt%, metallic chromium being atomized iron powder containing Mo 98.9 wt%, C0.0.9 wt%, S0.7 wt%, P0.016 wt%, P0.008 wt%, P0.017 wt%, S0.007 wt%, P0.015 wt%, S0.9 wt%, S0.015 wt%, S0.7 wt%, S0.9 wt%, P0.9 wt%, S0.015 wt%, S0.7 wt%, S0.9 wt%, P0.9 wt%, S3.9 wt%, S0.9 wt%, S3.9 wt.
According to the embodiment of the invention, the flux core is wrapped in an ultra-low carbon stainless steel band by adopting a precision forming process, and then the flux core welding wire is wound by fine drawing, diameter reduction, surface treatment and close-packed layer. Before the operations, the components of the flux core are uniformly mixed together according to the proportion to form the flux core, and an ultra-low carbon stainless steel strip meeting the component requirements is prepared in advance.
The welding deposited metal comprises the following components: 0.010-0.018 wt% of C, 0.50-2.50 wt% of Mn, 0.05-0.01 wt% of Si, less than or equal to 0.017 wt% of S, less than or equal to 0.025 wt% of P, 17.20-18.50 wt% of Cr, 12.60-13.80 wt% of Ni, 2.0-3.0 wt% of Mo, 0.013-0.034 wt% of N, less than or equal to 0.08 wt% of V, less than or equal to 0.05% of Cu, less than or equal to 0.05% of Al and the balance of Fe and inevitable impurities. And the weld metal of the flux-cored wire has the following physical and chemical properties: (1) the X-ray flaw detection grade at normal temperature is I grade, the tensile strength Rm is more than or equal to 520Mpa, the yield strength Rp0.2 is more than or equal to 400, and the elongation A is more than or equal to 35 percent; (2) according to the GB/T4334-2008E method and a stainless steel sulfuric acid-copper sulfate corrosion test method, determining that the weld metal of the flux-cored wire has no intergranular corrosion tendency; (3) impact energy KV2 at 196 ℃ below zero is more than or equal to 42J, and lateral expansion LE at 196 ℃ is more than or equal to 0.5 mm; has good ductility and better low-temperature impact toughness at low temperature.
Interpretation of terms
In the invention, the SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation container and equipment refer to an LNG storage tank, an LNG transport ship, an LNG satellite station, an LNG tank truck, an ultralow-temperature refrigerator, ultralow-temperature refrigeration equipment and the like.
Detailed Description
In the invention, the weight of the flux core accounts for 22-28 wt% of the total weight of the flux-cored wire.
Specifically, the ultra-low carbon stainless steel strip comprises the following components: less than or equal to 0.015 wt% of C, less than or equal to 2.0 wt% of Mn, less than or equal to 0.75 wt% of Si, 16.0-20.0 wt% of Cr and 10.0-14.0 wt% of Ni; less than or equal to 0.10 wt% of Cu, less than or equal to 0.005 wt% of S, less than or equal to 0.016 wt% of P, less than or equal to 0.10 wt% of N, 2.0-3.0 wt% of Mo, and the balance of Fe and inevitable impurities.
The flux core comprises the following components of 4.25-5.85 parts by weight of natural rutile, 0.8-1.9 parts by weight of quartz sand, 0.7-1.8 parts by weight of sodium titanate, 0.25-0.3 part by weight of sodium fluoride, 0.125-0.275 part by weight of calcined α aluminum oxide, 0.025-0.15 part by weight of ferrochrome nitride, 0.085-0.05 part by weight of spray ferrosilicon, 1.05-1.45 parts by weight of electrolytic manganese, 3.6-4.85 parts by weight of metallic chromium, 6.42-6.85 parts by weight of atomized iron powder, 1.9-2.5 parts by weight of nickel powder and 1.0-1.35 parts by weight of ferromolybdenum.
The present invention will be further described with reference to the following specific examples.
Example 1:
selecting 76kg of an ultra-low carbon stainless steel strip, wherein the ultra-low carbon stainless steel strip comprises the following components in percentage by mass: 0.0093 of C, 1.16 of Mn, 0.32 of Si, 18.65 of Cr, 10.84 of Ni, 0.006 of Cu, 0.003 of S, 0.011 of P, 0.021 of N and 2.55 of Mo, and the balance of Fe and inevitable impurities.
The weight of each component in the medicine core is as follows: TiO2296.52 wt%, S0.022 wt%, P0.027 wt% natural rutile 5.85 kg; containing SiO299.4wt％、Al2O30.8kg of quartz sand, wherein the quartz sand comprises 0.33 wt%, 0.019 wt% and 0.023 wt% of P; containing TiO272.7wt％、NaO216.8 wt%, S0.025 wt%, P0.034% of sodium titanate 1.3 kg; 0.25kg of sodium fluoride containing NaF99.6wt%; containing Al2O398.2 wt%, S not more than 0.017 wt%, P not more than 0.24 wt% of calcined α aluminum oxide 0.125kg, Cr62.4 wt%, N7.4 wt%, C0.044 wt%, S0.023 wt%, P0.027 wt% of chromium iron nitride 0.025kg, Si 45.0 wt%, C0.087 wt%, S0.011 wt%, P0.031 wt% of spray ferrosilicon 0.05kg, electrolytic manganese 1.05kg containing Mn 99.7 wt%, C0.035 wt%, S0.017 wt%, P0.017 wt%, iron powder 6.65kg containing Cr 98.9 wt%, C0.012 wt%, S0.016 wt%, P0.008 wt% of metallic chromium 4.25kg, Fe 98.9 wt%, C0.026 wt%, S0.014 wt%, P0.014 wt%, Ni 99.008 wt%, S0.007 wt%, P0.0070.1.61 wt%, P1.05 wt% of atomized iron powder 6.65kg, P0.65 wt%, S99.007 wt%, S0.007 wt%, S0.1.1.1.1.0070.61 wt%.
The flux core is prepared by uniformly mixing the components of the flux core according to the proportion, the flux core is subjected to heat preservation for 2-4 hours at the temperature of 200-250 ℃, is uniformly stirred, is wrapped in an ultra-low carbon stainless steel band by adopting a precision forming process, is accurately drawn and reduced to the specified diameter of the welding wire through pure CRD, is subjected to online annealing to eliminate work hardening and is subjected to cleaning treatment after oil stain on the surface of the welding wire is carbonized, then, a layer of lubricant is uniformly coated on the surface of the welding wire to ensure the wire feeding performance of the welding wire, and finally, the welding wire is wound into the flux core welding wire No. 1 through a dense layer.
The No. 1 flux-cored wire is subjected to welding process evaluation and deposited metal welding test according to GB/T17853-1999 and AWS A5.22. The welding main base material was a cryogenic low-temperature storage tank or vessel of SUS 316L.
The welding process evaluation results are as follows: the welding arc of the No. 1 flux-cored wire is stable, the welding seam is regularly formed and attractive in appearance, splashing is less, slag is removed well, and the deposition efficiency is 89.72%.
The deposited metal comprises the following components: 0.016 wt% of C, 0.98 wt% of Mn, 0.35 wt% of Si, 0.0037 wt% of S, 0.013wt% of P0.013wt% of Cr, 17.36 wt% of Ni, 12.75 wt% of Mo2.68wt% of N, 0.10 wt% of Cu, and the balance of Fe and inevitable impurities.
Mechanical properties of deposited metal: (1) the X-ray flaw detection grade at normal temperature is I grade, the tensile strength Rm563Mpa and the elongation rate A37 percent; (2) according to the GB/T4334-2008E method and a stainless steel sulfuric acid-copper sulfate corrosion test method, determining that the weld metal of the flux-cored wire has no intergranular corrosion tendency; (3) impact work KV 245J at minus 196 ℃ and lateral expansion LE0.53mm at minus 196 ℃; has good ductility and better low-temperature impact toughness at low temperature.
Example 2:
in this example, except for the weight of each component in the flux core, the other conditions and the manufacturing process are the same as those of example 1, and a # 2 flux-cored wire is obtained.
In the embodiment, 76kg of an ultra-low carbon stainless steel strip is selected, and a flux core is taken, wherein the flux core comprises the following components in parts by weight: containing TiO296.52 wt%, S0.022 wt%, P0.027 wt% natural rutile 4.9 kg; containing SiO299.4wt％、Al2O30.33 wt%, S0.019 wt% and P0.023 wt% of quartz sand 1.2 kg; containing TiO272.7wt％、NaO216.8 wt%, S0.025 wt%, P0.034% of sodium titanate 0.7 kg; 0.25kg of sodium fluoride containing 99.6 wt% of NaF; containing Al2O30.21kg of calcined α alumina with the weight percentage of 98.2 percent, the weight percentage of S less than or equal to 0.017 percent and the weight percentage of P less than or equal to 0.24 percent, 0.15kg of chromium nitride containing Cr62.4wt percent, N7.4wt percent, C0.044wt percent, S0.023wt percent and P0.027wt percent, 0.04kg of spray ferrosilicon containing Si 45.0wt percent, C0.087wt percent, S0.011 wt percent and P0.031 wt percent, 1.45kg of electrolytic manganese containing Mn 99.7wt percent, C0.035wt percent, S0.017wt percent and P0.017wt percent, 98.9wt percent of Cr, C0.012 wt percent, S0.016wt percent, P0.008wt percent and P0.027 percent4.85kg of metal chromium; 6.85kg of atomized iron powder containing 98.9 wt% of Fe, 0.026 wt% of C, 0.015 wt% of S and 0.014 wt% of P; 1.9kg of nickel powder containing 99.7 wt% of Ni, 0.008 wt% of C, 0.007 wt% of S and 0.007 wt% of P; 1.0kg of ferromolybdenum containing 61.3 wt% of Mo, 0.011 wt% of C, 0.007 wt% of S and 0.046 wt% of P.
And (3) carrying out welding process evaluation and deposited metal welding test on the No. 2 flux-cored wire according to GB/T17853-1999 and AWS A.22.
The welding process evaluation results are as follows: the welding arc of the No. 2 flux-cored wire is stable, the welding seam is regularly formed and attractive in appearance, splashing is less, slag is removed well, and the deposition efficiency is 90.87%. The deposited metal comprises the following components: 0.018 wt% of C, 1.23 wt% of Mn, 0.31wt% of Si, 0.0037 wt% of S, 0.013 wt% of P, 17.84 wt% of Cr, 13.11 wt% of Ni, 2.45wt% of Mo2, 111wt% of N, 0.012 wt% of Cu, and the balance of Fe and inevitable impurities. Mechanical properties of deposited metal: (1) the X-ray flaw detection grade at normal temperature is I grade, the tensile strength Rm 572Mpa and the elongation percentage A36 percent; (2) according to the GB/T4334-2008E method and a stainless steel sulfuric acid-copper sulfate corrosion test method, determining that the weld metal of the flux-cored wire has no intergranular corrosion tendency; (3) impact work KV 246J at minus 196 ℃ and lateral expansion LE 0.52mm at minus 196 ℃; has good ductility and better low-temperature impact toughness at low temperature.
Example 3:
in this example, except for the weight of each component in the flux core, the other conditions and the manufacturing process are the same as those of example 1, and a # 3 flux-cored wire is obtained.
In this example, 76kg of an ultra-low carbon stainless steel strip was selected, and a core was formed by spraying, by weight, 1.9kg of quartz sand containing TiO296.52wt%, S0.022 wt%, P0.027 wt%, 1.8kg of sodium titanate containing SiO299.4 wt%, Al2O30.33wt%, S0.019 wt%, P0.023 wt%, 0.3kg of sodium fluoride containing NaF99.6 wt%, 0.8kg of calcined ferrochrome containing TiO398.7 wt%, NaO216.8wt%, S0.025 wt%, P0.034 wt%, 0.275kg of aluminum oxide containing NaF99.6 wt%, 0.4 wt%, N7.4wt%, C0.044 wt%, S0.023 wt%, P0.027 wt%, P0.24 wt%, 0.03125 wt%, 0.017 wt%, 0.011 kg of Cr62.4 wt%, N7.4wt%, C0.044 wt%, S0.023 wt%, 0.8 wt% of iron powder containing Mo, 0.008 wt%, 0.017 wt%, 0.8kg of Si, 0.7 wt%, 0.8 wt%, 0.7 wt%, 0.8kg of atomized iron powder containing Si, 0.7 wt%, 0.8 wt%, 0.7 wt%, 0.8 wt%, 0.
And (3) carrying out welding process evaluation and deposited metal welding test on the # 3 flux-cored wire according to GB/T17853-1999 and AWS A5.22.
The welding process evaluation results are as follows: the 3# flux-cored wire has stable welding arc, regular and attractive welding seam size, less splashing, good slag removal and 91.51% of deposition efficiency. The deposited metal comprises the following components: 0.019 wt% of C, 1.33wt% of Mn1, 0.35wt% of Si0, 0.0027 wt% of S, 0.013 wt% of P, 17.96 wt% of Cr, 13.63 wt% of Ni, 2.42 wt% of Mo, 0.08wt% of N, 0.015 wt% of Cu, and the balance of Fe and inevitable impurities.
Mechanical properties of deposited metal: (1) the X-ray flaw detection grade at normal temperature is I grade, the tensile strength Rm577Mpa and the elongation percentage A38%; (2) according to the GB/T4334-2008E method and a stainless steel sulfuric acid-copper sulfate corrosion test method, determining that the weld metal of the flux-cored wire has no intergranular corrosion tendency; (3) impact work KV 248J at-196 ℃ and lateral expansion LE0.72mm at-196 ℃; has good ductility and better low-temperature impact toughness at low temperature.
In conclusion, the flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment disclosed by the invention simultaneously meets the corresponding technical requirements of the E316LT1-1 type flux-cored wire in GB/T17853 standard and AWS A5.22 standard, has higher strength and excellent low-temperature plasticity and toughness under the cryogenic low-temperature condition, and can be used for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment (LNG storage tanks, LNG transport ships, LNG satellite stations, LNG tank trucks, ultralow-temperature refrigerators, ultralow-temperature refrigeration equipment and the like).
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (8)
1. A gas-shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment comprises a steel strip and a flux core wrapped in the steel strip, wherein the flux core comprises the following components of 4.25-5.85 parts by weight of natural rutile, 0.8-1.9 parts by weight of quartz sand, 0.7-1.8 parts by weight of sodium titanate, 0.25-0.3 part by weight of sodium fluoride, 0.125-0.275 part by weight of calcined α aluminum oxide, 0.025-0.15 part by weight of ferrochrome nitride, 0.085-0.05 part by weight of sprayed ferrosilicon, 1.05-1.45 parts by weight of electrolytic manganese, 3.6-4.85 parts by weight of metallic chromium, 6.42-6.85 parts by weight of atomized iron powder, 1.9-2.5 parts by weight of nickel powder, 1.0-1.35 parts by weight of ferromolybdenum, 1.015-2.016 parts by weight of ultralow-0% by weight of Mn, 10% by weight of Si, 10% by weight of Ni, 10.015% by weight of Cu, 10% by weight of unavoidable impurities, 10% by weight of Ni, 10% by weight of unavoidable impurities and the balance of Cu.
2. The gas-shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers, equipment as claimed in claim 1, wherein: 0.0093 wt% of C, 1.16 wt% of Mn, 0.32 wt% of Si, 18.65wt% of Cr18, 10.84 wt% of Ni, 0.006 wt% of Cu, 0.003 wt% of S, 0.011 wt% of P, 0.021 wt% of N, 2.55wt% of Mo2, and the balance of Fe and inevitable impurities.
3. The gas-shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment according to any one of claims 1 and 2, wherein: the natural rutile is TiO-containing296.52 wt%, S0.022 wt%, P0.027wt% natural rutile, and quartz sand containing SiO299.4wt％、Al2O30.33 wt%, S0.019 wt% and P0.023 wt% of quartz sand, and sodium titanate is TiO-containing272.7wt％、NaO216.8wt％、S 0.025wt％、P0.034% sodium titanate, sodium fluoride containing NaF99.6 wt% sodium fluoride, calcined α aluminum oxide containing Al2O398.2 wt%, S is less than or equal to 0.017 wt%, P is less than or equal to 0.24 wt% of calcined α aluminum oxide, the chromium iron nitride is the chromium iron nitride containing 62.4 wt%, N7.4 wt%, C0.044 wt%, S0.023 wt% and P0.027 wt%, the sprayed ferrosilicon is the sprayed ferrosilicon containing 45.0 wt%, C0.087wt%, S0.011 wt% and P0.031 wt%, the electrolytic manganese is the sprayed ferrosilicon containing Mn 99.7 wt%, C0.035wt%, S0.017 wt% and P0.017 wt% of electrolytic manganese, the metallic chromium is the metallic chromium containing Cr 98.9 wt%, C0.012 wt%, S0.6wt% and P0.008 wt%, the atomized iron powder is the atomized iron powder containing Fe 98.9 wt%, C0.026 wt%, S0.015wt% and P0.0070.61 wt%, the nickel powder contains Ni 99.007 wt%, C99.008 wt%, Mo 0.007 wt%, S0.0070.61 wt% and P0.0070.61 wt% of molybdenum iron.
4. The gas-shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment according to claim 1 or 2, wherein the natural rutile is 5.85 parts by weight, the quartz sand is 0.8 parts by weight, the sodium titanate is 1.3 parts by weight, the sodium fluoride is 0.25 parts by weight, the calcined α aluminum oxide is 0.125 parts by weight, the chromium nitride is 0.025 parts by weight, the sprayed silicon iron is 0.05 parts by weight, the electrolytic manganese is 1.05 parts by weight, the metallic chromium is 4.25 parts by weight, the atomized iron powder is 6.65 parts by weight, the nickel powder is 1.9 parts by weight, and the ferromolybdenum is 1.15 parts by weight.
5. The gas-shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment according to any one of claims 1 and 2, characterized in that the flux-cored wire comprises 4.9 parts by weight of natural rutile, 1.2 parts by weight of quartz sand, 0.7 part by weight of sodium titanate, 0.25 part by weight of sodium fluoride, 0.21 part by weight of calcined α aluminum oxide, 0.15 part by weight of ferrochromium nitride, 0.04 part by weight of sprayed ferrosilicon, 1.45 parts by weight of electrolytic manganese, 4.85 parts by weight of metallic chromium, 6.85 parts by weight of atomized iron powder, 1.9 parts by weight of nickel powder, 1.0 part by weight of ferromolybdenum, or 4.25 parts by weight of natural rutile, 1.9 parts by weight of quartz sand, 1.8 parts by weight of sodium titanate, 0.3 parts by weight of sodium fluoride, 0.275 parts by weight of calcined α aluminum oxide, 0.12 parts by weight of ferrochromium nitride, 0.085 parts by weight of sprayed ferrosilicon, 1.4 parts by weight of electrolytic manganese, 3.6 parts by weight of metallic chromium powder, 3.42 parts by weight of atomized iron powder, 35 parts by weight of atomized.
6. A method for preparing the gas shielded flux cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment according to any of claims 1-5, wherein the method adopts precision forming, fine drawing and reducing, surface treatment and close-packed layer winding.
7. The method for preparing the gas-shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment according to claim 6, wherein the method is characterized in that the components of the flux core according to any one of claims 1 to 5 are uniformly mixed, the temperature is kept for 2 to 4 hours at 200 to 250 ℃, the flux core is wrapped in an ultra-low carbon stainless steel strip by a precision forming process after being uniformly stirred, the diameter is reduced to a specified diameter of the wire by pure CRD precision drawing, the wire is annealed on line to eliminate work hardening and is cleaned after oil stain on the surface of the wire is carbonized, then a layer of lubricant is uniformly coated on the surface of the wire to ensure the wire feeding performance of the wire, and finally the wire is wound into the flux-cored wire through a dense layer.
8. A welding method using the gas shielded flux-cored wire for welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment according to any one of claims 1 to 5, which is used in combination with welding SUS316L austenitic stainless steel cryogenic low-temperature storage and transportation containers and equipment.
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| CN108994425B (en) * | 2018-07-16 | 2020-12-15 | 中冶建筑研究总院有限公司 | Self-protection flux-cored wire for composite (re) manufacturing continuous casting roller and process |
| CN108971798B (en) * | 2018-09-29 | 2021-01-19 | 四川大西洋焊接材料股份有限公司 | Special welding wire for mixed gas shielded austenitic stainless steel and preparation method thereof |
| JP2023504413A (en) * | 2019-11-26 | 2023-02-03 | エサブ セア コーポレーション | Stainless steel welding wire used in LNG tank manufacturing |
| CN111266761B (en) * | 2020-02-18 | 2020-12-11 | 哈尔滨焊接研究院有限公司 | Low-nickel nitrogen-containing austenitic stainless steel flux-cored wire and preparation method thereof |
| CN111571063B (en) * | 2020-06-24 | 2022-04-15 | 北京金威焊材有限公司 | Flux-cored wire for ultralow-temperature stainless steel welding |
| CN115194361B (en) * | 2021-04-12 | 2024-01-26 | 天津市金桥焊材集团股份有限公司 | Low smoke and dust 50 kg-level weather-resistant flux-cored wire |
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| JP5410039B2 (en) * | 2008-06-03 | 2014-02-05 | 株式会社神戸製鋼所 | Stainless steel flux cored wire for electrogas arc welding |
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