CN110293332B - High-strength weather-proof and fire-resistant steel welding alkaline flux-cored wire - Google Patents
High-strength weather-proof and fire-resistant steel welding alkaline flux-cored wire Download PDFInfo
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- CN110293332B CN110293332B CN201910480080.8A CN201910480080A CN110293332B CN 110293332 B CN110293332 B CN 110293332B CN 201910480080 A CN201910480080 A CN 201910480080A CN 110293332 B CN110293332 B CN 110293332B
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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
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
-
- 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
Abstract
The invention discloses an alkaline flux-cored wire for welding high-strength weather-resistant and fire-resistant steel. The flux-cored wire comprises the following components in percentage by weight: magnesia: 18% -35%; fluorite: 5% -20%; barium fluoride: 3% -8%; zircon sand: 6 to 13 percent; manganese ore: 1% -7%; rutile: 5% -12%; and (3) marble: 2% -5%; aluminum magnesium alloy: 1% -3%; 0-2% of sodium fluosilicate; 0-1% of lithium fluoride; 0-1% of lithium carbonate; 2 to 5 percent of high-carbon ferrochrome; 0-12% of micro-carbon ferrochrome; copper powder: 0.3% -4%; 0.2 to 16 percent of nickel powder; silicon iron: 1.5% -4%; 1.8 to 8 percent of manganese powder; 1.6 to 5 percent of molybdenum powder; titanium iron: 1% -3%; b, iron and boron: 0.1% -1%; ferrocolumbium: 0 to 0.5 percent; vanadium iron: 0 to 0.8 percent; tungsten powder: 0 to 2 percent; 0.2 to 3.2 percent of rare earth oxide; graphite: 0 to 1 percent; the balance being iron powder.
Description
Technical Field
The invention relates to an alkaline flux-cored wire for welding high-strength weather-resistant and fire-resistant steel, belonging to the field of welding materials.
Background
With the rapid development of high-rise building industry, the realization of high performance (high strength, high toughness, light weight, corrosion resistance, fire resistance, environmental protection) and application reduction of structural steel based on the requirements of safety, economy, attractive appearance, space utilization and the like are the most effective ways for realizing energy conservation and consumption reduction in metallurgy and building industries. Since the 21 st century, the development of weathering resistant steels with high toughness and high corrosion resistance has been the target of many national steel researchers. At present, the foreign weathering steel develops towards high strength and high weather resistance, but the improvement of the strength of the weathering steel and the fire-resistant steel brings difficulty to welding. Weld cold cracking and weld heat affected zone embrittlement are common problems in the welding of high strength steels. In order to meet the requirements of strength and corrosion resistance, a large amount of alloy elements are added into the high-strength weathering steel, and particularly the carbon equivalent is improved, so that a welding heat affected zone has certain quenching and cold cracking tendency.
The basic welding material has low hydrogen, high toughness, high crack resistance and excellent mechanical property, which cannot be reached by the acid welding material, so the basic welding material is mostly used for welding important structures. The alkalinity is an important metallurgical performance index of the welding wire slag, and has great influence on metallurgical reaction on an interface of the slag and a metal phase. Desulfurization, dephosphorization and prevention of bath metal uptake of gases in the weld pool are all related to their basicity. The slag with high alkalinity has high alloy transition coefficient, is beneficial to the desulfurization and dephosphorization reaction of the weld metal, purifies the deposited weld metal, can reduce the oxygen content in the weld metal and is beneficial to improving the mechanical property of the weld metal. However, the alkaline material has poor technological properties, so that the application of the alkaline material is not promoted, and particularly, alkaline flux-cored wires for heat-resistant steel and weathering steel with tensile strength of 550MPa or above are rarely reported in many documents and markets.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the alkaline flux-cored wire which not only has good technological properties, but also has excellent mechanical properties, and simultaneously meets the welding requirements of weathering resistant steel and heat resistant steel with the tensile strength of more than 550MPa, and particularly has good inhibition effect on welding cold cracks.
In order to achieve the purpose, the invention adopts the following technical scheme:
an alkaline flux-cored wire for welding high-strength weather-resistant and fire-resistant steel comprises the following components in percentage by weight: magnesia: 18% -35%; fluorite: 5% -20%; barium fluoride: 3% -8%; zircon sand: 6 to 13 percent; manganese ore: 1% -7%; rutile: 5% -12%; and (3) marble: 2% -5%; aluminum magnesium alloy: 1% -3%; 0-2% of sodium fluosilicate; 0-1% of lithium fluoride; 0-1% of lithium carbonate; high-carbon ferrochrome: 2% -5%; micro-carbon ferrochrome: 0 to 12 percent; copper powder: 0.3-4%; 0.2 to 16 percent of nickel powder; silicon iron: 1.5% -4%; 1.8 to 8 percent of manganese powder; 1.6 to 5 percent of molybdenum powder; titanium iron: 1% -3.6%; b, iron and boron: 0.1% -1%; ferrocolumbium: 0 to 0.5 percent; vanadium iron: 0 to 0.8 percent; tungsten powder: 0 to 2 percent; 0.2 to 3.2 percent of rare earth oxide; graphite: 0 to 1 percent; the balance being iron powder.
The basic flux-cored wire of the invention has the following main components in action and content control:
1. magnesia: the main component of the magnesia is alkaline oxide MgO, and compared with CaO, the MgO is not easy to absorb moisture, thereby being beneficial to the moisture resistance of the welding wire. The molten MgO is not easy to generate oxidation-reduction reaction with other substances, and is an excellent protective medium. The magnesite mainly has the functions of slagging, adjusting the melting point, viscosity and the like of molten slag, has a remarkable effect on the thickness of a slag shell, and can improve the covering weld forming and the like of the slag shell. When the content of the magnesia is between 18 and 35 percent, the slag removal performance and the formability are good; when the content of the magnesite is more than 40 percent, the slag detachability and the forming are gradually reduced along with the increase of the content of the magnesite, and a slag shell is not easy to separate from a welding line. Therefore, the dosage of the magnesite is controlled to be 18-35 percent in the invention.
2. Fluorite: the main component is CaF2The melting point is about 1300 ℃. CaF2Has stronger dehydrogenation function; at the same time, CaF2Is also an alkaline component and has substantially no oxidation effect on alloying elements in the stainless steel. Melting CaF2The fluidity of the alloy is good, the viscosity is low, the alloy is beneficial to the floating of gas and impurities, the gas generated by the reaction stirs a molten pool, and the dynamic process of welding metallurgy is improved. CaF2When the sulfur-reducing agent is matched with CaO, the metallurgical reaction rate can be improved, and the sulfur content can be reduced. In the range of 5-20%, the increase of fluorite is favorable for improving slag detachability.
3. Barium fluoride: the physical and chemical properties of the slag are mainly improved, the melting point, viscosity and surface tension of the slag are adjusted, the fluidity of the slag is increased, and the good effect on the stability and slag removal performance of the electric arc is achieved; however, the content of barium fluoride is too high, which easily causes the reduction of the uniformity of slag shells, and the price is higher, so the content of barium fluoride is generally controlled between 3 percent and 8 percent.
4. Zircon sand (ZrSiO)4Or ZrO2·SiO2) In-containing ZrO267% of SiO233 percent. The addition of zircon sand mainly influences the slag removal performance of the molten slag and has limited influence on forming; although slag removal is facilitated, when the zircon sand is added in an excessive amount, oxidation of the weld joint is easily caused. Therefore, the content of the added zircon sand is controlled between 6 percent and 13 percent.
5. The main component of manganese ore is manganese oxide, wherein MnO is the highest. MnO is neutral oxide, and the melting point is about 1650 ℃. The addition of manganese ore has little influence on the slag removal performance of the slag, but the addition of manganese ore has great influence on the weld forming performance, and serious indentation and pockmark can occur when the addition amount is large. Therefore, the manganese ore is controlled to be between 1% and 7%.
6. Rutile: the main component being TiO2Having arc stabilization and slag regulationThe function of physicochemical property can adjust the melting point, viscosity and surface tension of the slag, improve the slag removal of the welding seam and the formation of the welding seam, and the addition of a proper amount of rutile in an alkaline slag system is beneficial to the mist transition of metal and reduces splashing. The content is controlled to be between 5 and 12 percent in general.
7. And (3) marble: the main component is CaCO3And is an important component of gas generation. Under the action of high temperature and electric arc, CaCO3Decomposing to CaO and gaseous CO2. Gaseous CO2Forming bubbles which escape from the bath. The escape of bubbles can promote the stirring effect of liquid in a molten pool, improve the mass transfer coefficient of dissolved gas, facilitate the reduction of the dissolved amount of hydrogen in metal in the molten pool, and effectively increase the area of a desulfurization reaction interface. However, when the marble is added too much, various welding defects are easily caused. The content of the marble is generally controlled to be 2-5%.
8. Aluminum magnesium alloy: the main effect is deoxidation, the oxide of magnesium and aluminum generated after deoxidation has a slagging effect, and magnesium can form magnesium steam at a lower temperature, so that protection in a molten drop stage and a molten drop-to-molten pool transition process is facilitated. When aluminum magnesium is used as a deoxidizer, hydrogen pores are easily caused by excessive addition, and are generally controlled to be 1-3%.
In the present invention, the rare earth oxide is at least one of cerium oxide and yttrium oxide.
In the invention, deposited metal of the flux-cored wire comprises the following components in percentage by weight: c: 0.06% -0.15%; cu: 0.1% -0.5%; cr: 0.2% -2.5%; cu: 0.1% -0.5%; ni: 0.1% -3%; si: 0.2% -0.6%; mn: 0.5% -2%; mo: 0.3% -1%; ti: 0.05% -0.12%; b: 0.005% -0.02%; w: 0 to 0.5 percent; nb: 0 to 0.05 percent; v: 0 to 0.1 percent; RE: 0.01 to 0.1 percent of the total weight of the alloy, and the balance of Fe and inevitable impurities.
The basic flux-cored wire deposited metal comprises the following main alloy components (in percentage by weight) and functions:
c: the weather resistance of the weathering steel is not good, and C has influence on welding performance, cold brittleness performance, processing performance and the like. Therefore, the C content is controlled to be between 0.06% and 0.15%. The deposited metal C mainly comes from high-carbon ferrochrome and graphite in the flux-cored wire.
Cu: has positive effect on the weather resistance of steel. The Cu content has obvious influence on the strength of the weathering steel, the yield strength of the weathering steel is gradually increased along with the increase of the Cu content, the weather resistance is increased, but the influence on the toughness is larger. When the Cu content in the steel is 0.1-05%, the corrosion resistance of the steel is superior to that of common carbon steel in rural atmosphere, industrial atmosphere or marine atmosphere. The Cu in the deposited metal is mainly derived from the Cu powder in the flux-cored wire.
Cr: can form compact oxide film on the surface of steel, improve the passivation capability of steel and obviously improve the corrosion resistance of steel. The heat resistance strength of the alloy can be improved along with the increase of the Cr content, but the low-temperature impact toughness is correspondingly reduced. The content of Cr in the welding material is 0.2-2.5%. When Cr and Cu are added simultaneously, the effect is particularly remarkable. The Cr in the deposited metal mainly comes from high-carbon ferrochrome and micro-carbon ferrochrome in the flux-cored wire.
Ni: the Ni is a relatively stable element, and the self-corrosion potential of the steel can be changed to the positive direction by adding the Ni, so that the stability of the steel is improved. Ni has little influence on the room temperature mechanical property of the steel and has favorable influence on high-temperature thermoplasticity and low-temperature impact property. The content of Ni is controlled as follows: 0.1% -3%; the Ni in the deposited metal is mainly derived from the nickel powder in the flux-cored wire.
Si: as ferrite forming elements, the silicon-rich aluminum alloy has the effect of solid solution strengthening, and can form a Si-rich protective film on the surface of steel, thereby improving the corrosion resistance of the steel; meanwhile, a proper amount of silicon can play a role in deoxidation in the flux-cored wire, and in addition, the low-content design is beneficial to improving the weldability, cold formability and fatigue toughness of the steel. Therefore, for weathering steel requiring high strength, the content of Si is controlled to 0.2% to 0.6%. The Si in the deposited metal is mainly from the ferrosilicon in the flux-cored wire.
Mn: the corrosion resistance of the steel in the ocean atmosphere can be improved, the alloy strength is improved, and the deoxidation effect is realized in the flux-cored wire. The Mn content of the invention is 0.5-2%. Mn in deposited metal mainly comes from manganese powder in the flux-cored wire.
Mo: when 0.4% -0.5% of Mo is contained in the steel, the corrosion rate of the steel in an atmospheric corrosion environment (especially in industrial atmosphere) is remarkably reduced, and the corrosion resistance of the steel is considered to be higher than that of chromium. The content of Mo in the invention is 0.3-1%. Mo in deposited metal mainly comes from molybdenum powder in the flux-cored wire.
Ti: the yield strength is obviously improved by adding Ti into the steel: when the Ti content is 0.05-0.08%, the grain size of the high-strength weathering steel is basically unchanged along with the increase of the Ti content. In order to improve the metal strength of the welding seam and refine crystal grains, the Ti content of the invention is 0.05-0.12%. Ti in the deposited metal mainly comes from ferrotitanium in the flux-cored wire.
The ferroboron with a certain content can obviously improve the hardness and the wear resistance of the welding line, and rapidly nucleates and refines crystal grains in the solidification process; however, when the B content exceeds a certain level, the toughness and plasticity thereof are remarkably decreased, and therefore, the B content is generally controlled to be between 0.005% and 0.02%. The B in the deposited metal is mainly from ferroboron in the flux-cored wire.
The W, Nb, V and ReO can be added independently or jointly to improve the high-temperature strength and the fire resistance of the welding seam, so that the tensile strength of the welding seam metal is insensitive to the change of welding heat input. And through a large number of experimental analyses, the compound rare earth of cerium and yttrium is found to greatly improve the high-temperature strength, the corrosion resistance and the plasticity of the deposited metal. In the present invention, the rare earth element is preferably at least one of cerium and yttrium. Considering the influence on toughness and the factors of cost performance, the alloy composition is controlled to be W: 0 to 0.5 percent; nb: 0 to 0.05 percent; v: 0 to 0.1 percent; RE: 0.01 to 0.1 percent. The W, Nb, V and RE in the deposited metal mainly come from tungsten powder, ferroniobium, ferrovanadium, cerium oxide and yttrium oxide in the flux-cored wire.
Fe can improve the flux-cored melting condition, is beneficial to improving the technological property of the welding wire and improving the cladding speed and the productivity of the welding wire.
The invention has the advantages that:
1. the main slag system adopted by the alkaline flux-cored wire is MgO-CaF2-BaF2The alkalinity coefficient B is more than or equal to 2.5; high cladding efficiency, good crack resistance and stable electric arc during weldingSmall splashing, good slag fluidity, beautiful forming and other process performances.
2. The comprehensive properties of the alkaline flux-cored wire deposited metal of the invention are as follows: the yield strength is more than or equal to 500 MPa; tensile strength is more than or equal to 600MPa, A is at-40 DEG CKVThe yield strength at the high temperature of 600 ℃ is greater than 2/3 of the yield strength at the room temperature, and the fire-resistant requirement of the high-strength building steel can be met; meanwhile, the alloy is equivalent to the atmospheric corrosion resistance rate and Q500NQR1, and can meet the atmospheric corrosion resistance capability. Therefore, the welding method can meet the welding requirement of important steel structures with tensile strength of 550Mpa grade for fire-resistant and weather-resistant steel.
Detailed Description
The present invention will be described in further detail with reference to examples, but the examples are not intended to limit the present invention.
The widely applied alkalinity calculation formula is the formula (1) recommended by the international society for welding, and the alkalinity coefficient B is calculated according to the formula, and the alkalinity coefficient B in the welding wire slag is not less than 2.5 through calculation, and belongs to an alkaline slag system.
The preparation method of the alkaline flux-cored wire comprises the following steps:
steel strip: the thickness (mm) x width (mm) of the steel strip is: 0.6-0.9 × 10 and related bands, the weight ratio is between 15-30%; diameter of welding wire: phi 1.2 mm-phi 1.6 mm.
The flux-cored wire is manufactured by the following mature technology: the method comprises the steps of purchasing a special low-carbon steel strip for the flux-cored wire, rolling the thin steel strip into a semicircular shape such as a U shape by using special equipment, adding alloy powder to form a core wire, rolling and sealing to form a long and thin metal tube coated with the core wire, and then rolling or cold drawing to form a finished flux-cored wire product with the diameter of phi 1.2 mm-phi 1.6 mm.
Example 1
The flux-cored wire of the embodiment comprises the following components: magnesia: 18g of a mixture; fluorite: 19g of a mixture; barium fluoride: 4g of the total weight of the mixture; zircon sand: 12g of a mixture; manganese ore: 2g of the total weight of the mixture; rutile: 10g of a mixture; and (3) marble: 3.5 g; aluminum magnesium alloy: 2.5 g; 1g of lithium fluoride; 4g of high-carbon ferrochrome; 10.5g of micro-carbon ferrochrome; 0.4g of nickel powder; silicon iron: 2.2 g; 4.2g of manganese powder; copper powder: 1.6 g; 1.8g of molybdenum powder; titanium iron: 1.6 g; b, iron and boron: 0.1 g; ferrocolumbium: 0.4 g; vanadium iron: 0.8 g; cerium oxide: 0.1g and yttrium oxide 0.3 g.
A common carbon steel strip H08A with a thickness of 0.8mm and a width of 10mm is used. The steel strip is rolled into a U shape, the powder in the above examples is added into the steel strip to form the core wires respectively, and the filling rate is 25 percent. And (4) rolling and sealing to form a long and thin metal tube coated with a welding core, and then rolling or cold drawing to form a finished product of the flux-cored wire with the diameter of phi 1.6 mm.
Example 2
The flux-cored wire of the embodiment comprises the following components: magnesia: 33.4 g; fluorite: 5g of the total weight of the mixture; barium fluoride: 8g of the total weight of the mixture; zircon sand: 6.7 g; manganese ore: 6g of a mixture; rutile: 8.5 g; and (3) marble: 2g of the total weight of the mixture; aluminum magnesium alloy: 1g of a compound; 1g of lithium carbonate; 2g of high-carbon ferrochrome; 4.5g of micro-carbon ferrochrome; 1g of graphite; 3.2g of nickel powder; silicon iron: 3.6 g; 7.2g of manganese powder; copper powder: 0.8 g; 2.2g of molybdenum powder; titanium iron: 1.2 g; b, iron and boron: 0.3 g; tungsten powder: 0.8 g; vanadium iron: 0.4 g; 1g of cerium oxide and 0.2g of yttrium oxide.
A common carbon steel strip H08A with a thickness of 0.8mm and a width of 10mm is used. The steel strip is rolled into a U shape, the powder in the above embodiments is added into the steel strip to form the core wires respectively, and the filling rate is 20%. And (4) rolling and sealing to form a long and thin metal tube coated with a welding core, and then rolling or cold drawing to form a finished product of the flux-cored wire with the diameter of phi 1.6 mm.
Example 3
The flux-cored wire of the embodiment comprises the following components: magnesia: 24g of a mixture; fluorite: 8g of the total weight of the mixture; barium fluoride: 3g of the total weight of the mixture; zircon sand: 6g of a mixture; manganese ore: 2.2 g; rutile: 6.4 g; and (3) marble: 5g of the total weight of the mixture; aluminum magnesium alloy: 2g of the total weight of the mixture; 2g of sodium fluosilicate; 0.1g of lithium fluoride; 0.5g of lithium carbonate; 3g of high-carbon ferrochrome; 15.8g of nickel powder; silicon iron: 1.8 g; 3.2g of manganese powder; copper powder: 2g of the total weight of the mixture; 4.8g of molybdenum powder; titanium iron: 3.0 g; b, iron and boron: 0.8 g; ferrocolumbium: 0.2 g; tungsten powder: 2g of the total weight of the mixture; 1.6g of cerium oxide and 1.6g of yttrium oxide; iron powder: 0.2 g.
A common carbon steel strip H08A with a thickness of 0.6mm and a width of 10mm is used. The steel strip is rolled into a U shape, the powder in the above examples is added into the steel strip to form the core wires respectively, and the filling rate is 17%. And (4) rolling and sealing to form a long and thin metal tube coated with a welding core, and then rolling or cold drawing to form a finished product of the flux-cored wire with the diameter phi of 1.2 mm.
1. Oblique Y groove weld crack test
Q460FR test boards and Q500NQR1 test boards are respectively selected, the thickness is 60mm, the welding temperature is 20 ℃, and the environmental humidity is 60%. Respectively welding three test plates under the conditions of normal temperature and preheating at 100 ℃, wherein the welding process comprises the following steps:
welding gas: carbon dioxide gas protection or argon-rich atmosphere protection;
welding current: 240A;
arc voltage: 29V;
welding speed: 250 mm/min;
gas flow rate: 18L/min;
layer temperature: below 200 ℃.
And after welding, firstly carrying out surface crack inspection on each test plate, and then taking 5 cross sections along the length of the test weld joint according to the standard to carry out section crack inspection.
The results show that: no matter preheating is carried out, no crack in any form exists on the joint section of the inclined Y-shaped groove, and the basic flux-cored wire has good weldability.
2. Deposited metal composition
Welding layer upon layer on the test panel of Q500NQR1, preparing the deposited metal, the test panel does not preheat before welding, and the technology is:
welding gas: carbon dioxide gas protection or argon-rich atmosphere protection;
welding current: 260A;
arc voltage: 29V;
welding speed: 250 mm/min;
gas flow rate: 18L/min;
layer temperature: below 200 ℃.
Welding length × width × height: 400mm X100 mm X30 mm, on the surface of which the composition analysis was carried out, as shown in Table 1:
TABLE 1 mass percent (wt%) of each component in deposited metal
3. Mechanical properties of deposited metal
Table 2 shows the normal temperature and high temperature mechanical properties of deposited metals using the basic flux-cored wire prepared in examples 1 to 3, wherein 1 normal temperature tensile bar, 1 high temperature tensile bar, and 5 impact specimens were taken for each deposited metal.
TABLE 2 mechanical Properties of deposited metals of examples 1 to 3
The data of the above examples show that the overall properties of the alkaline flux-cored wire deposited metal of the present invention are: the yield strength is more than or equal to 500 MPa; tensile strength is more than or equal to 600MPa, A is at-40 DEG CKVNot less than 60J, yield strength at 600 ℃ higher than 2/3 of room temperature yield strength, good low temperature impact toughness AKVNot less than 34J, and can meet the fire-resistant requirement of high-strength building steel.
5. Relative corrosion resistance
Samples of the base material Q500NQR1 and the weld deposit metal welded in examples 1 to 3, each having a thickness of 40 mm. times.20 mm. times.4 mm, were taken and subjected to a corrosion resistance test. And (5) polishing the sample to 1500# step by step, and cleaning the sample with alcohol after the surface of the sample is smooth and mirror-finished, and drying for later use. The periodic immersion accelerated corrosion test is carried out according to the specification of TB/T2375-93, 72H is immersed under the room temperature condition, and the experimental result is shown in Table 3.
TABLE 3 relative Corrosion resistance
| Examples | Weight loss by corrosion g/m2 | Relative corrosion resistance |
| 1 | 66.2 | 3.7％ |
| 2 | 70.2 | 2％ |
| 3 | 66.2 | 3.8％ |
| Q500NQR1 | 68.8 |
It can be seen that the relative corrosion resistance is less than 10%, which indicates that the atmospheric corrosion resistance of the welding wire in each embodiment is equivalent to that of Q500NQR1, and the atmospheric corrosion resistance can be satisfied.
Claims (4)
1. The high-strength weather-resistant and fire-resistant steel welding alkaline flux-cored wire is characterized in that the flux-cored wire comprises the following components in percentage by weight: magnesia: 18% -35%; fluorite: 5% -20%; barium fluoride: 3% -8%; zircon sand: 6 to 13 percent; manganese ore: 1% -7%; rutile: 5% -12%; and (3) marble: 2% -5%; aluminum magnesium alloy: 1% -3%; 0-2% of sodium fluosilicate; 0-1% of lithium fluoride; 0-1% of lithium carbonate; 2 to 5 percent of high-carbon ferrochrome; 0-12% of micro-carbon ferrochrome; copper powder: 0.3-4%; 0.2 to 16 percent of nickel powder; silicon iron: 1.5% -4%; 1.8 to 8 percent of manganese powder; 1.6 to 5 percent of molybdenum powder; titanium iron: 1% -3.6%; b, iron and boron: 0.1% -1%; ferrocolumbium: 0 to 0.5 percent; vanadium iron: 0 to 0.8 percent; tungsten powder: 0 to 2 percent; 0.2 to 3.2 percent of rare earth oxide; graphite: 0 to 1 percent; the balance being iron powder.
2. The basic flux-cored wire of claim 1, wherein the rare earth oxide is at least one of cerium oxide and yttrium oxide.
3. The alkaline flux-cored wire of claim 1, wherein the micro-carbon ferrochrome has a Cr content of 63% or more and a C content of 0.035% or less; the Si content in the ferrosilicon is more than 74 percent; the Ti content in the ferrotitanium is more than 20 percent; the Al content in the aluminum-magnesium alloy is more than 48%, and the total content of active metals is more than 97%; the content of Cr in the high-carbon ferrochrome is more than 63 percent, and the content of C in the high-carbon ferrochrome is more than 8 percent; the content of V in the ferrovanadium is 50 to 70 percent; the Nb content in the ferrocolumbium is 60-70 percent; the boron content in ferroboron is 16-20%; the purity of the copper powder, the tungsten powder, the molybdenum powder and the manganese powder reaches more than 99 percent.
4. The basic flux-cored welding wire of claim 1, wherein deposited metals of the flux-cored welding wire comprise the following components in percentage by weight: c: 0.06% -0.15%; cu: 0.1% -0.5%; cr: 0.2% -2.5%; ni: 0.1% -3%; si: 0.2% -0.6%; mn: 0.5% -2%; mo: 0.3% -1%; ti: 0.05% -0.12%; b: 0.005% -0.02%; w: 0 to 0.5 percent; nb: 0 to 0.05 percent; v: 0 to 0.1 percent; RE: 0.01 to 0.1 percent of the total weight of the alloy, and the balance of Fe and inevitable impurities.
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| CN111673313A (en) * | 2020-06-04 | 2020-09-18 | 江苏省沙钢钢铁研究院有限公司 | Gas shielded welding wire with fire-resistant and weather-resistant characteristics |
| CN112941403A (en) * | 2021-01-14 | 2021-06-11 | 上海欣冈贸易有限公司 | Sulfur-free low-carbon steel metal alloy for welding and composition thereof |
| CN112935613B (en) * | 2021-01-27 | 2022-04-29 | 郑州大学 | Matched flux-cored wire for welding iron-nickel alloy plates for ships |
| CN112935626B (en) * | 2021-02-07 | 2022-12-02 | 天津市金桥焊材集团股份有限公司 | Metal powder cored flux-cored wire for welding fire-resistant and weather-resistant steel |
| CN113441871B (en) * | 2021-06-01 | 2022-12-20 | 天津三英焊业股份有限公司 | Flux-cored wire suitable for laser-electric arc hybrid welding |
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| JP2565998B2 (en) * | 1989-01-06 | 1996-12-18 | 新日本製鐵株式会社 | Low-hydrogen coated arc welding rod for all positions with excellent fire resistance |
| CN1814396A (en) * | 2005-02-06 | 2006-08-09 | 中国船舶重工集团公司第七二五研究所 | High-toughness verylow hydrogen basic Co2 Cored welding wire |
| CN104889608B (en) * | 2015-06-26 | 2016-09-14 | 郑州华威焊业有限公司 | A kind of structural steel welding alkaline flux-cored wire |
| CN106141485A (en) * | 2016-07-29 | 2016-11-23 | 安徽飞狐焊业股份有限公司 | A kind of high-performance flux-cored wire |
| CN107470796B (en) * | 2017-09-29 | 2019-10-11 | 四川西冶新材料股份有限公司 | The bridge mating welding rod of 800MPa grades of weathering steels and its production method |
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