CN108015451B - High-toughness gas-shielded welding wire for long-life weather-proof steel structure and preparation method thereof - Google Patents
High-toughness gas-shielded welding wire for long-life weather-proof steel structure and preparation method thereof Download PDFInfo
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- CN108015451B CN108015451B CN201711245982.0A CN201711245982A CN108015451B CN 108015451 B CN108015451 B CN 108015451B CN 201711245982 A CN201711245982 A CN 201711245982A CN 108015451 B CN108015451 B CN 108015451B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3066—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
- B23K35/40—Making wire or rods for soldering or welding
Abstract
A high-toughness gas-shielded welding wire for a long-life weather-resistant steel structure and a preparation method thereof are disclosed, wherein the welding wire comprises the following chemical components in percentage by mass: c: 0.04-0.08 wt.%, Si: 0.40-0.60 wt.%, Mn: 1.10-1.40 wt.%, P ≤ 0.010 wt.%, S ≤ 0.006 wt.%, Cr: 0.25-0.45 wt.%, Mo: 0.10-0.25 wt.%, Cu: 0.25-0.40 wt.%, Ni: 1.00-1.30 wt.%, Ti: 0.01-0.03 wt.%, O: 0.004-0.008 wt.%, the total amount of unavoidable impurity elements is less than or equal to 0.30 wt.%, and the balance is Fe. The welding wire has stable welding performance through the technical scheme of scientifically proportioning chemical components, and the obtained deposited metal not only has good comprehensive mechanical property, but also has very excellent corrosion resistance and low-temperature impact toughness; the preparation method has the advantages of stable production process and high qualification rate.
Description
Technical Field
The invention relates to a high-toughness gas-shielded welding wire for a long-life weather-resistant steel structure and a preparation method thereof, belonging to the field of welding materials.
Background
With the high-speed development of national economy in China, the construction of high-speed trains and bridges is developing towards the directions of long service life, large parameters and high performance, and safety and reliability are the key points of the development. At present, the running speed of a high-speed train is developed to be more than 350 km/h, and the design service life is developed and designed from 30 years to more than 40 years at present; the large span development of bridges reaches the span of over kilometers, and the design service life is developed from the 100-year service life of the construction in recent years to more than 120 years. At present, key parts of high-speed trains such as bogies and long-span weather-resistant steel bridge structures are designed and manufactured by typical high-strength weather-resistant steel materials, welding is used as a key process in manufacturing, installing and maintaining of the high-speed trains, joint quality and performance play an important role in determining safety service of the weather-resistant steel structures, and the welding material is one of key factors influencing the performance of welding joints. Therefore, in order to realize large parameters and long service life of rail transit and bridge construction, higher requirements are put forward on long-term corrosion resistance, dynamic load fatigue performance and the like of a welding joint on a key part of a high-speed train and a long-span steel bridge structure, and meanwhile, in order to adapt to a high and cold environment, the welding joint is required to be ensured to have excellent impact toughness at the temperature of minus 60 ℃.
For the welding wire for welding the weathering steel, some researches are also carried out at home and abroad. Patent CN201010505223.5 (aWeather-resistant gas shielded welding wire for high-speed train bogie) discloses a gas shielded welding wire suitable for high-speed train bogie, which can meet the requirements of the bogie of the existing common high-speed train, but the corrosion resistance and the low-temperature impact toughness can not meet the requirements of long-life and large-parameter high-speed train. The reported weather-resistant gas-shielded welding wires G424M21Z and CHW-55CNH used for welding the bogie of the high-speed train can only ensure the impact toughness at the temperature of-40 ℃ and cannot ensure the impact toughness at the temperature of-60 ℃, and meanwhile, the corrosion rate of deposited metal which is periodically infiltrated for 100 hours is 1.5 multiplied by 10-6-2.0×10-6g/mm2H, lower than that of the parent SMA490BW (100h deposited metal corrosion rate of 1.35X 10)-6g/mm2H); the welding seam is the weakest position of the welding structural part, the corrosion resistance of the welding seam is a certain safety margin compared with the base metal, and the two welding wires can not meet the requirements of a long-service-life and large-parameter high-speed train. In the prior art, researches for improving the low-temperature impact toughness of the welding wire and the corrosion resistance of the welding wire are also carried out, but related welding wire researches which can meet the requirements of long service life and large parameters of key components of high-speed trains and large-span weather-resistant steel bridge structures and have excellent corrosion resistance and low-temperature impact toughness are not available. Therefore, the development of a gas shielded welding wire which can be used for a long-life weather-proof steel structure and has excellent toughness at a low temperature of-60 ℃ is urgently needed to meet the requirements of long service life, large parameters and high performance of key components of a high-speed train, such as a bogie and a large-span weather-proof steel bridge structure.
Disclosure of Invention
The invention aims to provide a high-toughness gas-shielded welding wire for a long-life weather-resistant steel structure and a preparation method thereof. The welding wire has stable welding performance through the technical scheme of scientifically proportioning chemical components, and the obtained deposited metal not only has good comprehensive mechanical property, but also has very excellent corrosion resistance and low-temperature impact toughness; the preparation method has the advantages of stable production process and high qualification rate.
The invention adopts the technical scheme that the invention achieves the aim that: a high-toughness gas-shielded welding wire for a long-life weather-resistant steel structure comprises the following chemical components in percentage by mass: c: 0.04-0.08 wt.%, Si: 0.40-0.60 wt.%, Mn: 1.10-1.40 wt.%, P ≤ 0.010 wt.%, S ≤ 0.006 wt.%, Cr: 0.25-0.45 wt.%, Mo: 0.10-0.25 wt.%, Cu: 0.25-0.40 wt.%, Ni: 1.00-1.30 wt.%, Ti: 0.01-0.03 wt.%, O: 0.0040 to 0.0080 wt.%, the total of unavoidable impurity elements is less than or equal to 0.30 wt.%, and the balance is Fe.
Preferably, the mass percent of Mo in the present invention is 0.15-0.22 wt.%.
Preferably, the mass percent of Ni in the present invention is 1.16-1.26 wt.%.
Preferably, the mass percent of Ti is 0.015-0.025 wt.%.
Preferably, the mass percent of Mn is 1.20-1.35 wt.%, the mass percent of Cr is 0.35-0.40 wt.%, the mass percent of Cu is 0.30-0.40 wt.%, and the mass percent of O is 0.0055-0.0072 wt.%.
The action mechanism and the limiting principle of each component of the welding wire are as follows:
c: carbon is an essential element in alloy steel and also an element that deteriorates weldability, and as the content of carbon increases, the strength and hardness of weld metal increase, and at the same time, the tendency to crystal cracking and cold cracking of the welded joint increases, and therefore the content of carbon in the weld material should be strictly controlled. In the present invention, it is limited to 0.04 to 0.08 wt.%.
Si: the addition of silicon is detrimental from the toughness point of view, since an increase in the silicon content makes the weld metal brittle. Whereas in metallurgy, silicon is a good deoxidizer and prevents the formation of CO pores. This is limited to 0.40-0.60 wt.% in the present invention. Below or above this range adversely affects the ductility and toughness of the weld metal.
Mn: mn is an austenite stabilizing element, shifting the austenite phase transition to lower temperatures. Mn can be used as a deoxidizer on one hand, and has the functions of grain refinement and solid solution strength on the other hand. The increase of the manganese content can increase the content of acicular ferrite in weld metal, reduce the quantity of proeutectoid ferrite, refine pearlite grains in the weld and fibrous tissues consisting of coarse crystal areas and fine crystal areas of the acicular ferrite, and improve the strength and hardenability of the weld; however, excessive Mn tends to cause segregation of compounds of Mn and P, thereby lowering toughness. It is limited in the present invention to 1.10-1.40 wt.%, preferably in the range of 1.20-1.35 wt.%.
Cr: cr is a main enrichment element in the weather-resistant deposited metal rust layer, the enrichment of Cr is favorable for refining grains of the rust layer, improving the corrosion potential of the rust layer, hindering the anodic dissolution reaction of weather-resistant steel, and being favorable for improving the atmospheric corrosion resistance, the addition of Cr is not more than 0.45 wt%, and when the content is more than 0.45 wt%, the weld joint is embrittled; below 0.25 wt.% the effect of corrosion resistance is insignificant. It is limited in the present invention to 0.25-0.45 wt.%, preferably in the range of 0.35-0.40 wt.%.
Mo: the proper amount of molybdenum element is added to effectively reduce the corrosion rate of the welding seam, molybdenum oxide with a corrosion inhibition effect is generated in the corrosion process of molybdenum in the welding seam, meanwhile, the affinity of the welding seam to oxygen is increased by Mo alloying, and competitive adsorption of corrosive chloride ions and the like is inhibited. In addition, molybdenum belongs to a strengthening element, and a proper amount of molybdenum can make up for the loss of low carbon to the weld strength, but molybdenum with too high content is unfavorable to the low-temperature impact toughness of weld metal. It is limited in the present invention to 0.10-0.25 wt.%, preferably in the range of 0.15-0.22 wt.%.
Cu: the addition of copper can significantly improve the weld metal corrosion resistance by slowing the anodic dissolution of Fe or reducing the conductivity of the rust layer, which reduces the rate of electron flow to the cathode region, but compromises weld toughness when the copper content is increased to 0.40 wt.%. It is limited in the present invention to 0.25-0.40 wt.%, with a preferred range of 0.30-0.40 wt.%.
Ni: nickel is an austenite forming element, the content of Ni is increased in a certain range, and the low-temperature impact toughness of the weld metal can be enhanced. Meanwhile, the nickel can form a compact oxide film between the rust layer and the matrix to prevent oxygen and water in the atmosphere from permeating into the metal matrix, so that the atmospheric corrosion resistance of the welding line is improved. It is limited in the present invention to 1.00-1.30 wt.%, preferably in the range of 1.16-1.26 wt.%.
Ti: titanium is a strong oxidizing element, and added trace Ti and oxygen are combined in the crystal to form titanium oxide which can become a nucleation core of ferrite, promote the generation of acicular ferrite in the crystal, refine crystal grains and effectively improve the low-temperature impact toughness. Ti content below 0.01 wt.% or above 0.03 wt.%, the effect is not significant. In the present invention it is limited to between 0.01 and 0.03 wt.%, preferably in the range of 0.015 to 0.025 wt.%.
P, S: sulfur and phosphorus are detrimental elements because sulfur/phosphide inclusions can both serve as a starting point for hydrogen-induced cracking and are also prone to stress corrosion cracking along the inclusion boundaries. However, due to the limitation of process conditions, P and S cannot be completely avoided, so the invention is based on the pure weld material design idea and is limited as follows: s is less than or equal to 0.006 wt.%, and P is less than or equal to 0.010 wt.%.
O: a proper amount of oxygen in the welding wire can react with Ti in the welding process to generate fine TiO inclusions serving as fine acicular ferrite nucleation cores, and the low-temperature impact toughness of the welding line is effectively improved. However, too low or too high oxygen content can cause the weld impact toughness to be reduced sharply, and the invention is limited to the following: 0.0040-0.0080 wt.%, preferably in the range of 0.0055-0.0072 wt.%.
In a word, the welding wire ensures the strength of a welding seam by adopting the solid solution strengthening and fine grain strengthening effects of C, Mn, Si and Mo, toughens a metal matrix of the welding seam by utilizing the improved ferrite cleavage fracture resistance of Ni, effectively adjusts the gamma → α transition temperature and narrows the transition temperature range by the combined action of Mo and Ti, forms a uniform fine grain ferrite structure, effectively improves the low-temperature impact toughness of the welding seam metal, ensures the atmospheric corrosion resistance of the welding seam through the interaction of Cr-Ni-Cu alloy elements, obviously reduces the welding seam corrosion rate and improves the atmospheric corrosion resistance under the combined action of Mo elements on the basis, keeps the welding seam pure purification through the control of impurity elements such as S, P and effectively improves the comprehensive mechanical property of the welding seam.
Compared with the prior art, the welding wire has the beneficial effects that: the welding wire disclosed by the invention not only has weather resistance, but also has high strength and high toughness, can be used for welding long-life weather-resistant steel structures, has excellent corrosion resistance and low-temperature impact toughness, and can meet the requirements of long service life, large parameters and high performance of weather-resistant steel structures such as key components of high-speed trains, large-span weather-resistant steel bridge structures and the like. Test and determination prove that the welding wire is used for resisting weather at the strength level of 550MPaThe tensile strength of the welded seam reaches more than 550MPa after welding, the impact energy of the welded seam reaches more than 120J at minus 40 ℃, the impact energy of the welded seam reaches more than 70J at minus 60 ℃, and the corrosion rate of deposited metal of the welding wire is less than or equal to 1.2 multiplied by 10 after the welding wire is periodically infiltrated for 100 hours-6g/mm2H, the corrosion rate of the deposited metal of the welding wire of the invention after the periodic infiltration of 1000h is less than or equal to 5.0 multiplied by 10-7g/mm2H, the corrosion resistance and the low-temperature impact toughness are both excellent, and the requirements of long service life, large parameter and high performance, high strength and high toughness are met.
When the welding wire is used, the welding wire comprises 70-90% of Ar and CO in percentage by volume2Welding with 10-30% Ar-rich mixed gas, preferably 80% Ar and CO2Welding by taking 20% of Ar-rich mixed gas as shielding gas, wherein the welding parameters are as follows: welding speed: 4-8 mm/s; gas flow rate: 17-23L/min; current: 240-: about 27-32V, and the channel temperature is 160-. . Tests prove that the electric arc is stable during welding under the condition, the weld joint is excellent in forming, less in welding spatter and better in toughness.
Further, the corrosion resistance of the welding wire deposited metal is as follows: the corrosion rate after the periodic soaking for 100 hours is less than or equal to 1.2 multiplied by 10-6g/mm2H, the corrosion rate after the periodic soaking for 1000h is less than or equal to 5.0 multiplied by 10-7g/mm2H; the low-temperature impact toughness of the welding wire deposited metal is as follows: the impact energy of welding seam at-40 deg.c is up to above 120J, and the impact energy of welding seam at-60 deg.c is up to above 70J.
Further, the mechanical properties of the welding wire deposited metal are as follows: yield strength Rp0.2Not less than 450 MPa; tensile strength RmMore than or equal to 550 MPa; the elongation A after fracture is more than or equal to 24 percent.
Furthermore, the long-life weather-proof steel structure comprises key components of a high-speed train and a weather-proof steel bridge steel structure which are in service for a long time under the wide-area service environment condition, wherein the wide-area service environment comprises a high-cold environment and a marine environment, and the long-term service comprises the design service life of the key components of the high-speed train for more than 40 years and the design service life of the weather-proof steel bridge steel structure for more than 120 years.
Further, the 550 MPa-grade weathering steel comprises weathering steel with the grades of S355J2W, SMA490BW and Q420 qNH.
The gas shielded welding wire material can be prepared by adopting the conventional preparation method in the prior art, and the technical effect can be realized as long as the final chemical components of the welding wire can meet the requirements of the invention. Meanwhile, the invention also discloses an optimal preparation method of the welding wire, and when the welding wire is prepared by the preparation method, the production process is stable, the control is easy, and the product qualification rate is high.
The invention discloses a preparation method of a high-toughness gas-shielded welding wire for a long-life weather-resistant steel structure, which comprises the following steps: the molten steel is smelted in a mode of desulfurization treatment, external refining or electroslag remelting, the molten steel is continuously cast into a square billet (the superheat degree and the casting speed are matched in the continuous casting process so as to improve the isometric crystal proportion of a casting blank), the square billet is rolled into a wire rod, the wire rod with the diameter of 5.5mm can be rolled into the wire rod, and then the wire rod is peeled, pickled to remove surface oxide skin, boronized, dried, drawn into wires, plated with copper and sized, and the method has the technical characteristics that:
the chemical components of the pickling solution for removing the surface oxide skin by pickling are as follows: the sulfuric acid content is 300 Ag/L, the ferrous sulfate content is less than or equal to 100 Ag/L;
the borax content in the boron liquid used in the boronizing process is 350 Ag 550 Ag/L, and the temperature in the boronizing process is controlled between 85 ℃ and 100 ℃;
the drawing and filamentation operation is as follows: firstly, roughly drawing the wire rod to phi 2.2-2.45mm, and then finely drawing the wire rod to phi 1.07-1.67 mm; after drawing into filaments, acid washing and alkali washing are carried out in sequence; the chemical components of the pickling solution are as follows: the sulfuric acid content of 220 Ag/L, the ferric sulfate content of less than or equal to 130 Ag/L; the alkaline washing solution comprises the following chemical components: the content of sodium hydroxide is 130-170 g/L;
the copper plating adopts a chemical copper plating method, and the chemical components of a copper plating solution used for the chemical copper plating are as follows: 35-55g/L of copper sulfate, 55-95g/L of sulfuric acid, 20-60g/L of ferrous sulfate and 0.12-0.16 mu m of thickness of a copper plating layer, wherein the content range of the chemical components Cu of the welding wire comprises the amount of Cu added in the copper plating process, and the welding wire is sized into the welding wire with the diameter of 1.0-1.6mm after chemical copper plating.
Compared with the prior art, the gas-shielded welding wire prepared by the preparation method has stable production process and easy control compared with other preparation methods, can be prepared into the welding wire with the diameter of 1-1.6mm, and has high product qualification rate.
Detailed Description
Example one
A high-toughness gas-shielded welding wire for a long-life weather-resistant steel structure comprises the following chemical components in percentage by mass: c: 0.046 wt.%, Si: 0.47 wt.%, Mn: 1.20 wt.%, P: 0.008 wt.%, S: 0.005 wt.%, Cr: 0.40 wt.%, Mo: 0.18 wt.%, Cu: 0.36 wt.%, Ni: 1.16 wt.%, Ti: 0.025 wt.%, O: 0.0072 wt.%, the total content of unavoidable impurity elements is less than or equal to 0.30 wt.%, and the balance is Fe.
The preparation method of the welding wire in the embodiment comprises the following steps: the method comprises the steps of carrying out desulphurization treatment on molten steel, smelting in an external refining or electroslag remelting mode, continuously casting the molten steel into a square billet, matching superheat degree and casting speed in the continuous casting process to improve the isometric crystal proportion of a casting blank, rolling the square billet into a wire rod with the diameter of 5.5mm, removing surface oxide skin through shelling and acid washing, carrying out boronization treatment, drying, drawing into wires, plating copper and sizing; the chemical components of the pickling solution for removing the surface oxide skin by pickling are 400 Ag/L sulfate content and 50 Ag/L ferrous sulfate content; the borax content in the boron liquid used in the boronizing process is 450 Ag/L, and the temperature in the boronizing process is controlled to be 95 ℃; the drawing and filamentation operation is as follows: firstly, the wire rod is roughly drawn to
Then finely drawing to phi 1.27 mm; after wire drawing, acid washing, alkali washing and chemical copper plating are carried out in sequence; the chemical components of the pickling solution are as follows: Ag/L, 100 Ag/L; the alkaline washing solution comprises the following chemical components: the content of sodium hydroxide is 150 g/L; the copper plating adopts a chemical copper plating method, and the chemical components of a copper plating solution of the chemical copper plating are as follows: 45g/L of copper sulfate, 75g/L of sulfuric acid and 40g/L of ferrous sulfate; finally, the welding wire with the diameter of 1.2mm is formed by chemical copper plating.
The welding wire of this example was subjected to a deposited metal performance test: yield strength Rp0.2Is 522 MPa;tensile strength RmIs 613 MPa; elongation after break is 28%; impact energy KV at-40 deg.C2Is 145J; impact energy KV at-60 deg.C2Is 95J; the corrosion rate of the deposited metal which is periodically soaked for 100h is 8.79 multiplied by 10-7g/mm2H; the corrosion rate of the deposited metal is 4.32 multiplied by 10 after the deposited metal is periodically soaked for 1000 hours-7g/mm2.h。
Example two
A high-toughness gas-shielded welding wire for a long-life weather-resistant steel structure comprises the following chemical components in percentage by mass: c: 0.053 wt.%, Si: 0.51 wt.%, Mn: 1.24 wt.%, P: 0.007 wt.%, S: 0.005 wt.%, Cr: 0.38 wt.%, Mo: 0.15 wt.%, Cu: 0.30 wt.%, Ni: 1.17 wt.%, Ti: 0.015 wt.%, O: 0.0069 wt.%, the total of unavoidable impurity elements is less than or equal to 0.30 wt.%, and the balance is Fe.
The method for preparing the welding wire in the embodiment is the same as that of the embodiment I.
The welding wire of this example was subjected to a deposited metal performance test: yield strength Rp0.2Is 506 MPa; tensile strength Rm592 MPa; elongation after break is 26%; impact energy KV at-40 deg.C2Is 140J; impact energy KV at-60 deg.C2Is 102J; the corrosion rate of the deposited metal is 9.22 multiplied by 10 after the deposited metal is periodically soaked for 100h-7g/mm2H; the corrosion rate of the deposited metal is 4.50 multiplied by 10 after the deposited metal is periodically soaked for 1000 hours-7g/mm2.h。
EXAMPLE III
A high-toughness gas-shielded welding wire for a long-life weather-resistant steel structure comprises the following chemical components in percentage by mass: c: 0.06 wt.%, Si: 0.55 wt.%, Mn: 1.35 wt.%, P: 0.009 wt.%, S: 0.004 wt.%, Cr: 0.35 wt.%, Mo: 0.22 wt.%, Cu: 0.38 wt.%, Ni: 1.26 wt.%, Ti: 0.018 wt.%, O: 0.0055 wt.%, the total of unavoidable impurity elements is less than or equal to 0.30 wt.%, and the balance is Fe.
The method for preparing the welding wire in the embodiment is the same as that of the embodiment I.
The welding wire of this example was subjected to a deposited metal performance test: yield strength Rp0.2Is 534 MPa; tensile strength Rm621 MPa; break-offThe post elongation is 25%; impact energy KV at-40 deg.C2Is 124J; impact energy KV at-60 deg.C2Is 88J; the corrosion rate of the deposited metal which is periodically soaked for 100 hours is 8.18 multiplied by 10-7g/mm2H; the corrosion rate of the deposited metal is 4.01 multiplied by 10 after the deposited metal is periodically soaked for 1000 hours-7g/mm2.h。
Example four
A high-toughness gas-shielded welding wire for a long-life weather-resistant steel structure comprises the following chemical components in percentage by mass: c: 0.04 wt.%, Si: 0.40 wt.%, Mn: 1.10 wt.%, P: 0.008 wt.%, S: 0.003 wt.%, Cr: 0.25 wt.%, Mo: 0.10 wt.%, Cu: 0.25 wt.%, Ni: 1.00 wt.%, Ti: 0.01 wt.%, O: 0.0040 wt.%, the total of unavoidable impurity elements is less than or equal to 0.30 wt.%, and the balance is Fe.
The preparation method of the welding wire in the embodiment comprises the following steps: the method comprises the steps of carrying out desulfurization treatment on molten steel, smelting in an external refining or electroslag remelting mode, continuously casting the molten steel into a square billet, rolling the square billet into a wire rod with the diameter of 5.5mm, removing surface oxide skin through shelling and acid washing, carrying out boronization treatment, drying, drawing into wires, plating copper and sizing; the chemical components of the pickling solution for removing the surface oxide skin by pickling are as follows: Ag/L sulfate content 300 Ag/L; the borax content in the boron liquid used in the boronizing process is 350 Ag/L, and the temperature in the boronizing process is controlled to be 85 ℃; the drawing and filamentation operation is as follows: firstly, roughly drawing the wire rod to phi 2.2-2.45mm, and then finely drawing the wire rod to phi 1.27 mm; after wire drawing, acid washing, alkali washing and chemical copper plating are carried out in sequence; the chemical components of the pickling solution are as follows: Ag/L sulfate content 220 Ag/L; the alkaline washing solution comprises the following chemical components: the content of sodium hydroxide is 130 g/L; the chemical components of the copper plating solution for electroless copper plating are as follows: 35g/L of copper sulfate, 55g/L of sulfuric acid and 20g/L of ferrous sulfate; finally, the welding wire with the diameter of 1.2mm is formed by chemical copper plating.
The welding wire of this example was subjected to a deposited metal performance test: yield strength Rp02 is 493 MPa; tensile strength RmIs 578 MPa; elongation after break is 27%; impact energy KV at-40 deg.C2Is 125J; impact energy KV at-60 deg.C2Is 72J; the corrosion rate of the deposited metal is 1.11 multiplied by 10 after the deposited metal is periodically soaked for 100 hours-6g/mm2H; period of timeThe corrosion rate of the deposited metal after being soaked for 1000 hours is 4.60 multiplied by 10-7g/mm2.h。
EXAMPLE five
A high-toughness gas-shielded welding wire for a long-life weather-resistant steel structure comprises the following chemical components in percentage by mass: c: 0.08 wt.%, Si: 0.60 wt.%, Mn: 1.40 wt.%, P: 0.010 wt.%, S: 0.006 wt.%, Cr: 0.45 wt.%, Mo: 0.25 wt.%, Cu: 0.40 wt.%, Ni: 1.30 wt.%, Ti: 0.03 wt.%, O: 0.0080 wt.%, the total content of unavoidable impurity elements is less than or equal to 0.30 wt.%, and the rest is Fe.
The preparation method of the welding wire in the embodiment comprises the following steps: the method comprises the steps of carrying out desulfurization treatment on molten steel, smelting in an external refining or electroslag remelting mode, continuously casting the molten steel into a square billet, rolling the square billet into a wire rod, carrying out shelling and acid cleaning to remove surface oxide skin, carrying out boronization treatment, drying and drawing to form wires; the chemical components of the pickling solution for removing the surface oxide skin by pickling are as follows: Ag/L sulfate content 450 Ag/L, Fe sulfate content 100 Ag/L; the borax content in the boron liquid used in the boronizing process is 550 Ag/L, and the temperature in the boronizing process is controlled to be 100 ℃; the drawing and filamentation operation is as follows: firstly, roughly drawing the wire rod to phi 2.2-2.45mm, and then finely drawing the wire rod to phi 1.27 mm; after wire drawing, acid washing, alkali washing and chemical copper plating are carried out in sequence; the chemical components of the pickling solution are as follows: Ag/L, 130 Ag/L; the alkaline washing solution comprises the following chemical components: the content of sodium hydroxide is 170 g/L; the chemical components of the copper plating solution for electroless copper plating are as follows: 55g/L of copper sulfate, 95g/L of sulfuric acid and 60g/L of ferrous sulfate; finally, the welding wire with the diameter of 1.2mm is formed by chemical copper plating.
The welding wire of this example was subjected to a deposited metal performance test: yield strength Rp0.2Is 568 MPa; tensile strength RmIs 654 MPa; elongation after break is 24%; impact energy KV at-40 deg.C2Is 160J; impact energy KV at-60 deg.C2Is 100J; the corrosion rate of the deposited metal which is periodically soaked for 100 hours is 1.18 multiplied by 10-6g/mm2H; the corrosion rate of the deposited metal is 4.95 multiplied by 10 after the deposited metal is periodically soaked for 1000 hours-7g/mm2.h。
Comparative example 1
The gas shielded welding wire comprises the following chemical components in percentage by mass: c: 0.052 wt.%, Si: 0.41 wt.%, Mn: 1.27 wt.%, P: 0.008 wt.%, S: 0.006 wt.%, Cr: 0.33 wt.%, Mo: 0.18, Cu: 0.32 wt.%, Ni: 1.12 wt.%, O: 0.0092 wt.%, the balance being Fe and unavoidable impurities.
The method for preparing the welding wire in the embodiment is the same as that of the embodiment I.
The welding wire of this example was subjected to a deposited metal performance test: yield strength Rp0.2Is 526 MPa; tensile strength Rm588 MPa; elongation after break 23%; impact energy KV at-40 deg.C2Is 78J; impact energy KV at-60 deg.C2Is 35J; the corrosion rate of the deposited metal is 1.15 multiplied by 10 when the deposited metal is periodically soaked for 100h-6g/mm2H; the corrosion rate of the deposited metal which is periodically soaked for 1000h is 4.92 multiplied by 10-7g/mm2.h。
Comparative example No. two
The gas shielded welding wire comprises the following chemical components in percentage by mass: c: 0.055 wt.%, Si: 0.53 wt.%, Mn: 1.22 wt.%, P: 0.008 wt.%, S: 0.006 wt.%, Cr: 0.42 wt.%, Mo: 0.12 wt.%, Cu: 0.26 wt.%, Ni: 0.62 wt.%, Ti: 0.021 wt.%, O: 0.0055 wt.%, the balance Fe and unavoidable impurities.
The method for preparing the welding wire in the embodiment is the same as that of the embodiment I.
The welding wire of this example was subjected to a deposited metal performance test: yield strength R of deposited metalp0.2Is 512 MPa; tensile strength RmIs 600 MPa; elongation after break is 24%; impact energy KV at-40 deg.C2Is 88J; impact energy KV at-60 deg.C2Is 38J; the corrosion rate of the deposited metal which is periodically soaked for 100h is 1.58 multiplied by 10-6g/mm2H; the corrosion rate of the deposited metal is 6.5 multiplied by 10 after the deposited metal is periodically soaked for 1000 hours-7g/mm2.h。
Comparative example No. three
The gas shielded welding wire comprises the following chemical components in percentage by mass: c: 0.062 wt.%, Si: 0.60 wt.%, Mn: 1.17 wt.%, P: 0.008 wt.%, S: 0.006 wt.%, Cr: 0.37 wt.%, Cu: 0.33 wt.%, Ni: 1.20 wt.%, Ti: 0.015 wt.%, O: 0.0063 wt.%, balance Fe and unavoidable impurities.
The method for preparing the welding wire in the embodiment is the same as that of the embodiment I.
The welding wire of this example was subjected to a deposited metal performance test: yield strength Rp0.2Is 464 MPa; tensile strength RmIs 551 MPa; elongation after break is 24%; impact energy KV at-40 deg.C2Is 116J; impact energy KV at-60 deg.C2Is 62J; the corrosion rate of the deposited metal which is periodically soaked for 100h is 1.77 multiplied by 10-6g/mm2H; the corrosion rate of the deposited metal is 7.2 multiplied by 10 after the deposited metal is periodically soaked for 1000 hours-7g/mm2.h。
In the above examples and comparative examples, the volume percentage composition of the welding wire is 80% Ar and 80% CO2Welding the 20% Ar-rich mixed gas to obtain deposited metal, wherein the welding parameters are as follows: welding speed: 6 mm/s; gas flow rate: 20L/min; current: 265A, voltage: about 27.5V, and the temperature of the road is 170 ℃.
The following table is a summary of the chemical composition of the welding wire of each example of the invention and comparative example:
the following table is a summary of the properties of the wire deposited metals of the examples of the invention and comparative examples:
with the above examples, comparative examples and summarized tables it can be seen that: in comparative example one: because Ti is not added in the welding wire and O is more than or equal to 0.0080 wt.%, the impact toughness is deteriorated, and excellent low-temperature impact toughness cannot be obtained; in comparative example two: the Ni content in the welding wire is less than or equal to 1.0 wt.%, so that the impact toughness and the weather resistance are obviously reduced, and the weather resistance and the low-temperature toughness in a long-term service environment cannot be ensured; in comparative example three: because Mo is not added in the welding wire, the weather resistance is poor, the tensile strength is also reduced, and the allowance is insufficient.
Claims (10)
1. The utility model provides a high tenacity gas shield welding wire for long-life resistant steel structure which characterized in that: the welding wire comprises the following chemical components in percentage by mass: c: 0.04-0.08 wt.%, Si: 0.40-0.60 wt.%, Mn: 1.10-1.40 wt.%, P ≤ 0.010 wt.%, S ≤ 0.006 wt.%, Cr: 0.25-0.45 wt.%, Mo: 0.10-0.25 wt.%, Cu: 0.25-0.40 wt.%, Ni: 1.00-1.30 wt.%, Ti: 0.01-0.03 wt.%, O: 0.0040 to 0.0080 wt.%, the total of unavoidable impurity elements is less than or equal to 0.30 wt.%, and the balance is Fe.
2. The high toughness gas shielded welding wire for long life weather resistant steel structure as claimed in claim 1, wherein: the mass percent of Mo is 0.15-0.22 wt.%.
3. The high toughness gas shielded welding wire for long life weather resistant steel structure as claimed in claim 1, wherein: the mass percent of the Ni is 1.16-1.26 wt.%.
4. The high toughness gas shielded welding wire for long life weather resistant steel structure as claimed in claim 1, wherein: the mass percent of Ti is 0.015-0.025 wt.%.
5. The high toughness gas shielded welding wire for long life weather resistant steel structure as claimed in claim 1, wherein: the mass percent of Mn is 1.20-1.35 wt.%, the mass percent of Cr is 0.35-0.40 wt.%, the mass percent of Cu is 0.30-0.40 wt.%, and the mass percent of O is 0.0055-0.0072 wt.%.
6. The high toughness gas shielded welding wire for long life weather resistant steel structure as claimed in claim 1, wherein: corrosion resistance of welding wire deposited metalThe etching performance is as follows: the corrosion rate after the periodic soaking for 100 hours is less than or equal to 1.2 multiplied by 10-6g/mm2H, the corrosion rate after the periodic soaking for 1000h is less than or equal to 5.0 multiplied by 10-7g/mm2H; the low-temperature impact toughness property of the welding wire deposited metal is as follows: the impact energy of the welding seam at minus 40 ℃ is more than 120J, and the impact energy of the welding seam at minus 60 ℃ is more than 70J.
7. The high toughness gas shielded welding wire for long life weather resistant steel structure as claimed in claim 1, wherein: the mechanical properties of the welding wire deposited metal are as follows: yield strength Rp0.2Not less than 450 MPa; tensile strength RmMore than or equal to 550 MPa; the elongation A after fracture is more than or equal to 24 percent.
8. The high toughness gas shielded welding wire for long life weather resistant steel structure as claimed in claim 1, wherein: the long-life weather-resistant steel structure comprises key components of a high-speed train which is in service for a long time under the wide area service environment condition and a weather-resistant steel bridge steel structure, the wide area service environment comprises a high-cold environment and a marine environment, and the long-life service comprises the design life of the key components of the high-speed train for more than 40 years and the design life of the weather-resistant steel bridge steel structure for more than 120 years.
9. The high toughness gas shielded welding wire for long life weather resistant steel structure as claimed in claim 1, wherein: the weathering steel includes weathering steel of grade S355J2W, SMA490BW and Q420 qNH.
10. The method for producing a high toughness gas shielded welding wire for long life weather resistant steel structure as claimed in any one of claims 1 to 9, said producing step comprising: the molten steel is processed by desulfurization, smelting in an external refining or electroslag remelting mode, continuously cast into a square billet, the square billet is rolled into a wire rod, the surface oxide skin is removed by shelling and acid washing, the surface oxide skin is boronized, dried, drawn into wire, plated with copper and sized, and the method is characterized in that:
the chemical components of the pickling solution for removing the surface oxide skin by pickling are as follows: the sulfuric acid content is 300 Ag/L, the ferrous sulfate content is less than or equal to 100 Ag/L;
the borax content in the boron liquid used in the boronizing process is 350 Ag 550 Ag/L, and the temperature in the boronizing process is controlled between 85 ℃ and 100 ℃;
the drawing and filamentation operation is as follows: firstly, roughly drawing the wire rod to phi 2.2-2.45mm, and then finely drawing the wire rod to phi 1.07-1.67 mm; after drawing into filaments, acid washing and alkali washing are carried out in sequence; the chemical components of the pickling solution are as follows: the sulfuric acid content of 220 Ag/L, the ferric sulfate content of less than or equal to 130 Ag/L; the alkaline washing solution comprises the following chemical components: the content of sodium hydroxide is 130-170 g/L;
the copper plating adopts a chemical copper plating method, and the chemical components of a copper plating solution used for the chemical copper plating are as follows: 35-55g/L of copper sulfate, 55-95g/L of sulfuric acid and 20-60g/L of ferrous sulfate, and sizing the copper sulfate into a welding wire with the diameter of 1.0-1.6mm after chemical copper plating.
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| CN110549033A (en) * | 2019-09-12 | 2019-12-10 | 四川西冶新材料股份有限公司 | weather-resistant bridge steel Q690qE matched gas shielded welding wire and preparation method thereof |
| CN111299899A (en) * | 2019-12-11 | 2020-06-19 | 天津市永昌焊丝有限公司 | Marine atmosphere corrosion resistant steel matched gas shielded welding wire rod, welding wire and application |
| CN111299900A (en) * | 2019-12-11 | 2020-06-19 | 天津市永昌焊丝有限公司 | Marine atmosphere corrosion resistant steel matched gas shielded welding wire rod, welding wire and application |
| CN111975246B (en) * | 2020-09-02 | 2021-07-30 | 燕山大学 | Coating-free weather-resistant argon-rich gas shielded welding wire with 650 MPa-level tensile strength for steel bridge and wire rod |
| CN112692464B (en) * | 2020-12-16 | 2023-04-07 | 哈焊所华通（常州）焊业股份有限公司 | Corrosion-resistant high-strength welding material for E690 steel for ocean engineering |
| CN114227061A (en) * | 2021-12-02 | 2022-03-25 | 中车长江运输设备集团有限公司 | High-toughness gas-shielded solid welding wire suitable for large-specification welding and application thereof |
| CN115302127A (en) * | 2022-10-12 | 2022-11-08 | 中国科学院金属研究所 | Consumable electrode active gas shielded welding wire for 500 MPa-grade extremely cold ocean engineering and application thereof |
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| CN1131893C (en) * | 1999-09-26 | 2003-12-24 | 何明威 | Copperplating additive, its preparation method and application in coppered welding wire |
| CN100469513C (en) * | 2007-09-12 | 2009-03-18 | 钢铁研究总院 | High-strength gas-defended welding wire material |
| CN101704170B (en) * | 2009-11-03 | 2012-01-18 | 武汉钢铁(集团)公司 | High-toughness gas shielded welding wire and preparation method and use method thereof |
| CN102922171B (en) * | 2012-11-30 | 2015-01-07 | 江苏天业合金材料有限公司 | Production technology of Non-preheating and non-copper-plating automatic low-alloy-steel welding wire for ships |
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| CN106312372B (en) * | 2016-11-23 | 2019-10-18 | 四川西冶新材料股份有限公司 | A kind of welding of 1000MPa high-strength steel gas shielded solid welding wire and its preparation and welding method |
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