CN111673313A - Gas shielded welding wire with fire-resistant and weather-resistant characteristics - Google Patents
Gas shielded welding wire with fire-resistant and weather-resistant characteristics Download PDFInfo
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- CN111673313A CN111673313A CN202010498531.3A CN202010498531A CN111673313A CN 111673313 A CN111673313 A CN 111673313A CN 202010498531 A CN202010498531 A CN 202010498531A CN 111673313 A CN111673313 A CN 111673313A
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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
- B23K35/02—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
Abstract
The invention provides a gas shielded welding wire which has the characteristics of fire resistance and weather resistance, low-temperature impact toughness and good welding process performance. The welding wire comprises the following chemical components in percentage by weight: c: 0.04% -0.09%, Si: 0.25-0.50%, Mn: 1.20-1.60%, P is less than or equal to 0.012%, S is less than or equal to 0.005%, Mo: 0.30-0.60%, Cr: 0.10% -0.50%, Ni: 0.60% -1.00%, Cu: 0.10-0.40%, Ti: 0.05-0.15%, Re: 0.015 to 0.05 percent of the total weight of the alloy, and the balance of Fe and inevitable impurities. The normal-temperature tensile strength Rm of the welding wire deposited metal is more than or equal to 570MPa, and the yield strength Rp0.2More than or equal to 460MPa, elongation A more than or equal to 18 percent, and low-temperature impact energy KV at minus 40 DEG C2Not less than 47J; maintaining the yield strength of the welding wire deposited metal at 600 ℃ for 1-3 hours to be not lower than 2/3 of the minimum yield strength specified at normal temperature; the atmospheric corrosion resistance index I calculated according to chemical components is more than or equal to 6.0; the welding wire has reasonable component design and simple and convenient manufacture, and is suitable for gas shielded welding of the shock-resistant, fire-resistant and corrosion-resistant steel plate with the yield strength of 460 MPa.
Description
Technical Field
The invention belongs to the field of welding materials, and particularly relates to a gas-shielded welding wire with fire-resistant and weather-resistant characteristics, which is particularly suitable for gas-shielded welding of shock-resistant, fire-resistant and corrosion-resistant steel plates with yield strength of 460 MPa.
Background
Under the background that modern large buildings are developed towards high-rise, large-span, high-safety, energy-saving and environment-friendly directions, higher requirements are put forward on the performances of toughness, fire resistance, corrosion resistance, earthquake resistance and the like of the steel for building structures. Compared with the traditional building structural steel, the high-performance building structural steel with the fire resistance (the yield strength at the high temperature of 600 ℃ is not lower than 2/3 of the normal-temperature yield strength) and the atmospheric corrosion resistance (the weather resistance index I is not less than 6.0) greatly reduces the use of fire-proof paint and corrosion-resistant coating, not only reduces the construction difficulty, shortens the construction period and reduces the building cost, but also reduces the pollution to the environment, improves the utilization efficiency of resources and energy, and is an important development direction of the high-performance building structural steel. In recent years, steel material manufacturers at home and abroad develop and apply fire-resistant, weather-resistant, earthquake-resistant and other series of steel materials successively. Welding is a manufacturing process technology used on a large scale in construction of a building steel structure, but the problem that the fire resistance and the corrosion resistance of a welding material are not matched with those of a base metal is very prominent when the fire-resistant corrosion-resistant steel is welded, the national standard does not have the relevant standard of the welding material matched with the fire-resistant corrosion-resistant steel, so that the production and the use of the welding material are disordered, the fire resistance and the corrosion resistance of a welding joint cannot meet the requirements of the base metal, if the fire-resistant and corrosion-resistant coating is not sprayed, the actual service life cycle of the steel structure cannot meet the requirements of the building design, and the wide application of the fire-resistant.
Patent CN108788518A discloses a 690MPa gas shield welding wire for earthquake-resistant, corrosion-resistant and fire-resistant building structural steel, the welding wire comprises the following chemical elements by mass percent: c: 0.02% -0.14%, Si: 0.41-1.00%, Cr: 0-0.70%, Ni: 1.00% -3.50%, Cu: 0.20% -0.90%, Mn: 1.20% -2.20%, Mo: 0.60% -1.00%, Ti: 0-0.12%, V: 0-0.12%, Mg: 0 to 0.10 percent of Fe and inevitable impurities as the rest; the yield strength of the formed weld metal is 469-592MPa, the tensile strength is 538-661MPa, the elongation is 18-22%, and the high-temperature yield strength of the weld metal is 463-535 MPa; and has high low-temperature impact toughness. However, the welding wire contains more noble metals of Ni and Mo, and the manufacturing cost of the welding wire is higher; in addition, the high Si content in the welding wire can inhibit cementite from being separated out and decomposed from austenite, promote the formation of coarse M-A components and damage the impact toughness of weld metal.
The patent CN108941972A discloses a 460 MPa-level gas shielded welding wire for anti-seismic, corrosion-resistant and fire-resistant structural steel, the welding wire comprises the following chemical elements by mass percent: c: 0.02% -0.14%, Si: 0.41-1.00%, Cr: 0.10% -0.90%, Ni: 0.1% -3.0%, Cu: 0-0.70%, Mn: 0.50% -1.80%, Mo: 0.20% -0.59%, Ti: 0-0.12%, V: 0-0.08%, Mg: 0 to 0.08 percent, and the balance of Fe and inevitable impurities; the yield strength of the formed welding metal is 410-590MPa, the tensile strength is 450-620MPa, the elongation A is 21-26%, the reduction of area is 60-71%, and the high-temperature yield strength of the welding metal is 320-438 MPa; and has high low-temperature impact toughness. The defects that the normal-temperature tensile strength of the welding wire can not stably reach more than 570MPa, the normal-temperature yield strength can not stably reach more than 460MPa, and the technical requirements of the construction of the shock-resistant, fire-resistant and corrosion-resistant steel with the yield strength of 460MPa can not be met.
In the technical solutions disclosed in patent CN 101362262B, patent CN 103056548B and patent CN 105880871 a, the gas-shielded welding wire has good high-temperature performance, but is mainly used for welding of chromium-molybdenum refractory steel, and has no weather resistance. In addition, the gas-shielded welding wires disclosed in patent CN 1301825C, patent CN 1290661C, patent CN 101357425B, patent CN 102441745B, patent CN 103111772A, patent CN 103600178A, patent CN 106216877B and patent CN109175786A all have good weather resistance, but do not have fire resistance.
Patent CN 105798481B discloses a coating-free weather-resistant gas welding wire for a weather-resistant bridge, the welding wire comprises the following chemical components in percentage by mass: c: 0.03% -0.10%, Si: 0.30% -0.50%, Mn: 1.20-1.60%, P is less than or equal to 0.012%, S is less than or equal to 0.005%, Cr: 0.30% -0.60%, Ni: 0.20% -0.50%, Cu: 0.20% -0.50%, Ca: 0.005% -0.025%, Re: 0.005-0.05%, the welding wire is used for welding weather-resistant bridge steel, the tensile strength of deposited metal is high, the yield strength is good, the elongation is more than or equal to 24%, and the low-temperature impact toughness and atmospheric corrosion resistance are excellent. The welding wire is mainly used for the welding of weather-resistant bridge steel in a matching way and has no fire resistance.
Disclosure of Invention
The invention aims to solve the problems and the defects, and provides a high-strength and high-toughness gas-shielded welding wire with fire-resistant and weather-resistant properties, which is particularly suitable for gas-shielded welding of shock-resistant, fire-resistant and corrosion-resistant steel with the yield strength of 460 MPa. The deposited metal welded by the welding wire has higher room temperature strength, high temperature strength and good low temperature toughness, and the atmospheric corrosion resistance index I calculated according to chemical components is more than or equal to 6.0.
The technical scheme adopted by the invention is as follows: a gas shielded welding wire with fire-resistant and weather-resistant characteristics comprises the following chemical components in percentage by weight: c: 0.04% -0.09%, Si: 0.35-0.50%, Mn: 1.20-1.60%, P is less than or equal to 0.012%, S is less than or equal to 0.005%, Mo: 0.30-0.60%, Cr: 0.10% -0.50%, Ni: 0.60% -1.00%, Cu: 0.10-0.40%, Ti: 0.05-0.15%, Re: 0.015 to 0.05 percent of the total weight of the alloy, and the balance of Fe and inevitable impurities.
The Re is Ce or La.
The atmospheric corrosion resistance index I of the welding wire calculated according to chemical components is more than or equal to 6.0, wherein:
I＝26.01(％Cu)+3.88(％Ni)+1.20(％Cr)+1.49(％Si)+17.28(％P)-7.29(％Cu)(％Ni)-9.10(％Ni)(％P)-33.39(％Cu)2。
the welding wire adopts 80% Ar + 20% CO2The deposited metal obtained by argon-rich mixed gas shielded welding mainly comprises acicular ferrite and a small amount of bainite, the normal-temperature tensile strength Rm of the deposited metal is more than or equal to 570MPa, and the yield strength Rp0.2 is more than or equal to 460 MPa; the low-temperature impact energy KV2 at minus 40 ℃ is more than or equal to 47J at minus 40 ℃, and the elongation A is more than or equal to 18 percentAnd maintaining the yield strength of the deposited metal at 600 ℃ for 1-3 hours to be not lower than 2/3 of the minimum yield strength specified at normal temperature.
In the technical scheme, the design basis of each component of the welding wire is as follows:
c: the high-strength steel is a main strengthening element of a welding seam, the yield strength and the tensile strength of welding seam metal are improved along with the increase of the content of C, but the low-temperature impact toughness and the atmospheric corrosion resistance of the welding seam metal are not facilitated if the content of C is increased too much, and in order to ensure that the welding seam has better strength-toughness matching and corrosion resistance, the content of C is controlled to be 0.04-0.09%.
Mn: the strength and the toughness of weld metal can be improved, the alloy is also a main deoxidizing element, and oxygen-sulfur compound inclusions generated by deoxidizing reaction can be used as nucleation particles of acicular ferrite. When the content of Mn in a welding seam is low during gas shielded welding, the content of oxygen in welding seam metal is high, and when the content of Mn is too high, segregation is easy to generate, so that the impact toughness of the welding seam metal is reduced. In consideration of the transition coefficient of Mn element in the argon-rich mixed gas shielded welding, the invention controls the content of Mn to be between 1.20 and 1.60 percent.
Si: the alloy and Mn play a combined deoxidation role and also have an effect of strengthening the weld joint, but when the Si content in the weld joint is too high, the weld joint metal can be promoted to form a coarse M-A component, and the impact toughness of the weld joint metal is damaged. The preferable range of Si in the welding wire is 0.25-0.50%.
Mo: the normal temperature and high temperature strength and thermal stability of the weld metal can be obviously improved, and the overheating tendency of the weld metal is reduced; the addition of a certain amount of Mo can effectively reduce the phase transition temperature of the weld metal in the postweld cooling process, refine the weld metal structure and enlarge the forming temperature range of the needle-shaped ferrite. In addition, Mo and Cu are added in a compounding way, so that a compact oxide film can be formed on the surface of the welding seam, and the atmospheric corrosion resistance of the welding seam metal is improved. Preferably, the Mo content in the welding wire is 0.35-0.60% by weight.
Cr: the high-temperature oxidation resistance and creep resistance of the steel can be effectively improved, and the high-temperature strength of weld metal is improved; cr is also a main element for improving the corrosion resistance of the welding wire, and can improve the compactness of a rust layer and the atmospheric corrosion resistance. However, if the Cr content exceeds 0.50%, the side bar ferrite is easily generated, and the weld toughness is deteriorated. Preferably, the content of Cr in the welding wire is controlled to be 0.10-0.50%.
Ni: ni can reduce the content of proeutectoid ferrite, promote the formation of acicular ferrite, and is beneficial to improving the toughness of weld metal, particularly low-temperature impact toughness and reducing the brittle transition temperature; on the other hand, Ni element can effectively enhance the corrosion resistance of the weld metal. The high Ni content can cause large difference between the components of the welding line and the base metal, and the potential difference is generated between the welding line and the base metal, so the corrosion resistance of the welding joint is reduced, therefore, the Ni content is controlled to be 0.60-1.00 percent.
Cu: the Cu element with a proper amount of transition into the weld metal can obviously improve the atmospheric corrosion resistance of the weld metal, and the excessive addition can increase the hot brittleness of the weld metal, so the content of the Cu element is preferably 0.10-0.40%.
Ti: the bonding force with O, N element is strong, and TiO, TiO2 and TiN are easy to form as nucleation particles of acicular ferrite, and the formation of the acicular ferrite in austenite crystal is promoted, so that the weld structure is refined, and the toughness is improved. Meanwhile, the addition of Ti can change the surface activity of molten drop metal, promote the transition of molten drop, reduce splashing and improve the welding manufacturability of the welding wire.
Re: the rare earth elements in the welding line are greatly enriched on silicate inclusions, so that the spheroidization and refinement effects are realized on the inclusions in the welding line, and the inclusions suitable for inducing acicular ferrite are increased, so that the nucleation of the acicular ferrite is facilitated, the formation of the pro-eutectoid ferrite is inhibited, the welding line structure is refined, and the toughness of welding line metal is improved; if the addition amount is too large, the weld seam grain boundary can be polluted, the effect of inhibiting the grain boundary proeutectoid ferrite is lost, and the low-temperature toughness of the weld seam metal is reduced. Therefore, the Re content in the welding wire is controlled to be 0.015-0.05%.
S, P: harmful elements can obviously reduce the low-temperature toughness and the welding performance of weld metal, and the content of the harmful elements is controlled to be less than or equal to 0.012 percent of P and less than or equal to 0.005 percent of S.
The invention has the beneficial effects that:
(1) the gas-shielded welding wire adopts deposited metal formed by argon-rich mixed gas shielded welding, the normal-temperature tensile strength Rm is more than or equal to 570MPa, and the yield strength Rp0.2Not less than 460 MPa; low-temperature impact energy KV at minus 40 DEG C247J or more, the elongation A is 18% or more, and the yield strength of the deposited metal is maintained to be not lower than 2/3 of the minimum yield strength specified at normal temperature within 1-3 hours at 600 ℃.
(2) The welding wire alloy system is reasonably regulated and controlled, and proper Mo and Cr are added to strengthen a ferrite matrix through solid solution strengthening and precipitation strengthening, so that the strength of a weld metal grain boundary area is improved, and the weld metal is ensured to have excellent high-temperature performance at the high temperature of 600 ℃; due to the addition of proper alloy elements such as Cu, Cr, Ni and Mo, the compactness and stability of the weld metal rust layer can be improved, and the weather resistance of the weld metal can be ensured; the addition of proper Mn, Ni and Mo not only plays a good role in improving the low-temperature impact toughness, but also ensures the strength of the weld metal; the addition of trace elements Ti and Re promotes the generation of a large amount of fine acicular ferrite in weld metal, the grains of the ferrite in columnar crystal are refined, the toughness of the weld metal is further improved by the cooperation of the fine acicular ferrite with Mn, Ni and Mo, and meanwhile, the rare earth elements can also reduce inclusions, have a purifying effect on deposited metal, and improve the metallurgical quality and the low-temperature impact toughness.
(3) The welding wire is prepared by a plurality of alloying and microalloying technologies, and the deposited metal obtained by argon-rich mixed gas shielded welding is mainly composed of acicular ferrite and a small amount of bainite, so that the welding wire ensures that the weld metal has good toughness and good fire resistance and corrosion resistance. In addition, the welding wire has stable electric arc, less welding smoke, high deposition efficiency and good welding manufacturability in the welding process.
Drawings
FIG. 1 is a schematic diagram of the dimensions, assembly and welding of a welding wire deposited metal test plate according to an embodiment of the invention;
FIG. 2 is a typical structure of deposited metal formed by the welding wire of the embodiment of the invention;
FIG. 3 is a typical structure and appearance of deposited metal formed by the welding wire of comparative example 1;
FIG. 4 shows a typical structure of deposited metal formed by the welding wire of comparative example 2 according to the present invention.
Wherein 1-deposited metal, 2-barrier layer
Detailed Description
The present invention will be further specifically described with reference to the following examples. The explanation and the description do not unduly limit the technical solution of the present invention. All modifications directly derivable or suggested from the present disclosure are within the scope of the invention.
The welding wire is prepared by the following steps: smelting, refining, die casting into ingots, heating to perform controlled rolling of wires, and performing hot continuous rolling to form 5.5mm welding wire coils. After the components and the surface are inspected to be qualified, the wire rod is subjected to annealing heat treatment after being peeled, pickled and roughly drawn to 2.2-3.5mm, and then is subjected to drawing, surface degreasing, copper plating and close-packed layer winding, so that the 1.2mm welding wire is finally produced and packaged into a disc. The chemical composition distribution ratio (mass percent) and the weather resistance index I of the specific embodiment of the welding wire are shown in Table 1.
Table 1 example and comparative example wire chemistry composition ratio (Wt.%) of
In Table 1 above, examples 1 to 6 are chemical composition distribution examples of the welding wire of the present invention, comparative example 1 is a welding wire TH550-NQ- П for weathering steel, comparative example 2 is a wire for gas protection for fire-resistant steel, and the weather resistance index I in the above table is calculated according to the formula I of 26.01 (% Cu) +3.88 (% Ni) +1.20 (% Cr) +1.49 (% Si) +17.28 (% P) -7.29 (% Cu) (% Ni) -9.10 (% Ni) (% P) -33.39 (% Cu)2As can be seen, the weather resistance index I of the welding wire is within the range of 6.33-6.87, the weather resistance indexes are all larger than 6.0, and are equivalent to the weather resistance index TH550-NQ- П of the gas shielded welding wire for weathering steel in the comparative example 1, and the comparative example isThe weather resistance index of the 2 common gas shielded welding wire for the refractory steel is 2.67, and the requirement that the atmospheric corrosion resistance index I is more than or equal to 6.0 cannot be met.
The welding wire is used for a deposited metal test, a Q345 steel plate with the thickness of 20mm is adopted as a test plate, the thickness of a base plate is 12mm, the form of a groove is V-shaped, the angle of the groove is 45 degrees, the gap of the groove is 12mm, referring to the attached drawing 1, the isolating layer of the groove surface and the base plate surface is formed by welding the same welding wire as the welding wire in the example of the table 1, and the thickness of the isolating layer 2 is not less than 3 mm. The mixed gas of 80% Ar + 20% CO2 is used as protective gas, gas shielded welding is adopted to carry out deposited metal test, preheating is not carried out before welding, the welding current is 260A-290A, the arc voltage is 27V-32V, the welding speed is 5.5 +/-1.0 mm/s, and the interlayer temperature is controlled at 150 +/-15 ℃. After flaw detection is qualified, each deposited metal is sampled, and a normal-temperature tensile property test, a high-temperature tensile property test at 600 ℃ for 1 hour and a high-temperature tensile property test at-40 ℃ for 3 hours are carried out. The normal temperature tensile properties, high temperature tensile properties and low temperature impact energy of the obtained deposited metal 1 are shown in table 2.
TABLE 2 mechanical property measurement results of welding wire deposited metal of examples and comparative examples
As can be seen from the table 2, the deposited metal 1 of the welding wire has the normal temperature yield strength of 521-583 MPa, the normal temperature tensile strength of 606-687 MPa, the elongation of 18.8-24.8%, the impact energy of-40 ℃ of 56-121J, the high temperature yield strength of 346-425 MPa after heat preservation for 1 hour at 600 ℃ and the high temperature yield strength of 329-413 MPa after heat preservation for 3 hours at 600 ℃, has excellent comprehensive mechanical properties, is well matched with the strength and the high temperature performance of a 460 MPa-level anti-seismic, fire-resistant and corrosion-resistant steel plate Q460FS, meets the related technical requirements and has larger margin; the normal-temperature yield strength of the welding wire of the comparative example 1 is 507MPa, the normal-temperature tensile strength is 597MPa, the elongation is 20.5%, the high-temperature yield strength after the welding wire is kept at 600 ℃ for 1 hour is 282MPa, the high-temperature yield strength after the welding wire is kept at 600 ℃ for 1 hour is 254MPa, the impact work at minus 40 ℃ is in the range of 49-81J, the normal-temperature tensile property of the welding wire deposited metal of the comparative example 1 can meet the standard requirement of a base material Q460FS, but the high-temperature tensile property of the welding wire deposited metal of the comparative example 1 can not meet the requirement of the anti-seismic fire-resistant corrosion steel on the high-temperature property (not lower than 2/3 of the normal; the normal-temperature yield strength of the welding wire in the comparative example 2 is 510MPa, the normal-temperature tensile strength is 601MPa, the elongation is 26.0%, the high-temperature yield strength after the welding wire is kept at 600 ℃ for 1 hour is 334MPa, the high-temperature yield strength after the welding wire is kept at 600 ℃ for 1 hour is 311MPa, the impact energy at minus 40 ℃ is within the range of 17-35J, the normal-temperature and high-temperature tensile properties of the welding wire deposited metal in the comparative example 2 can meet the standard requirement of a base material Q460FS, but the impact energy at minus 40 ℃ is lower than 47J, and the requirement of the anti-seismic, fire-resistant and corrosion-resistant. Therefore, compared with the common weather-resistant steel welding wire and the common fire-resistant steel welding wire, the welding wire has obvious advantages in comprehensive mechanical property.
The typical structure morphology of the deposited metal formed by the welding wire of the embodiment 2 of the invention is shown in figure 2, the typical structure morphology of the deposited metal formed by the welding wires of the comparative example 1 and the comparative example 2 is respectively shown in figures 3 and 4, and the welding wire deposited metal structure type of the invention is mainly a fine acicular ferrite structure and a small amount of granular bainite structure, the deposited metal of the welding wire of the invention has good low-temperature toughness, while the welding wire deposited metal structure type of the comparative example 1 is acicular ferrite + side plate bar ferrite, and the welding wire deposited metal structure type of the comparative example 2 is composed of side plate bar ferrite and coarse columnar crystal, and the low-temperature impact toughness of the deposited metal is lower.
Furthermore, the deposited metal is sampled, and a periodic immersion/drying cycle accelerated corrosion test is carried out by using 0.01mol/LNaHSO4 solution according to TB/T2375-2008 'periodic immersion corrosion test method for weathering steel for railway', wherein the test period is 720h (30 days), and the corrosion form under the industrial atmospheric environment is simulated. After the test is finished, 1000ml of 36% HCl +20g of antimony trioxide +50g of argon tin oxide is adopted to remove corrosion products on the surface of the sample, and the corrosion rate of deposited metal of each welding wire is calculated according to the mass weightlessness of the sample before and after the test, and the result is shown in table 4. Therefore, under the condition of simulating an industrial atmospheric environment, the relative corrosion rate of the welding wire is within the range of 2-5%, and the requirement that the TB/T2375-2008 standard relative corrosion rate is not more than 10% is met.
TABLE 4 Corrosion test results of various welding wires to deposit metals under simulated industrial atmospheric environment
The welding wire is suitable for argon-rich gas shielded welding, has good technological properties, the obtained deposited metal has high normal-temperature and high-temperature tensile strength, and simultaneously has high low-temperature impact toughness, the atmospheric corrosion resistance index I is not less than 6.0, the comprehensive properties are excellent, the welding wire can be used for welding shock-resistant, fire-resistant and corrosion-resistant steel plates with the yield strength of 460MPa, and can be popularized to the fields of bridges, railway vehicles and the like.
Claims (4)
1. A gas shielded welding wire with fire-resistant and weather-resistant characteristics is characterized in that: the welding wire comprises the following chemical components in percentage by weight: c: 0.04% -0.09%, Si: 0.25-0.50%, Mn: 1.20-1.60%, P is less than or equal to 0.012%, S is less than or equal to 0.005%, Mo: 0.30-0.60%, Cr: 0.10% -0.50%, Ni: 0.60% -1.00%, Cu: 0.10-0.40%, Ti: 0.05-0.15%, Re: 0.015 to 0.05 percent of the total weight of the alloy, and the balance of Fe and inevitable impurities; the deposited metal obtained by welding with the welding wire has a structure comprising acicular ferrite and bainite.
2. The gas-shielded welding wire with fire-resistant and weather-resistant characteristics according to claim 1, wherein: the Re is Ce or La.
3. The gas-shielded welding wire with fire-resistant and weather-resistant characteristics according to claim 1, wherein the atmospheric corrosion resistance index I of the welding wire calculated according to chemical compositions is not less than 6.0, wherein:
I＝26.01(％Cu)+3.88(％Ni)+1.20(％Cr)+1.49(％Si)+17.28(％P)-7.29(％Cu)(％Ni)-9.10(％Ni)(％P)-33.39(％Cu)2。
4. the gas-shielded welding wire with fire-resistant and weather-resistant characteristics according to claim 1, wherein: the normal temperature tensile strength Rm of the deposited metal obtained by welding with the welding wire is more than or equal to 570MPa, and the yield strength Rp0.2More than or equal to 460MPa, elongation A more than or equal to 18 percent, and low-temperature impact energy KV at minus 40 DEG C2Not less than 47J; the yield strength of the welding wire deposited metal is not lower than 2/3 of the minimum yield strength specified at normal temperature after being kept for 1-3 hours at 600 ℃.
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| CN112935627A (en) * | 2021-02-07 | 2021-06-11 | 天津市金桥焊材集团股份有限公司 | Consumable electrode gas shielded solid welding wire for welding refractory weathering steel |
| CN113478120A (en) * | 2021-06-23 | 2021-10-08 | 南京钢铁股份有限公司 | 460 MPa-level all-position gas-shielded welding wire for secondary fire resistant building and manufacturing method thereof |
| CN113478119A (en) * | 2021-06-23 | 2021-10-08 | 南京钢铁股份有限公司 | 390 MPa-level all-position gas-shielded welding wire for secondary fire resistant building and manufacturing method thereof |
| 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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| CN112935627A (en) * | 2021-02-07 | 2021-06-11 | 天津市金桥焊材集团股份有限公司 | Consumable electrode gas shielded solid welding wire for welding refractory weathering steel |
| CN113478120A (en) * | 2021-06-23 | 2021-10-08 | 南京钢铁股份有限公司 | 460 MPa-level all-position gas-shielded welding wire for secondary fire resistant building and manufacturing method thereof |
| CN113478119A (en) * | 2021-06-23 | 2021-10-08 | 南京钢铁股份有限公司 | 390 MPa-level all-position gas-shielded welding wire for secondary fire resistant building and manufacturing method thereof |
| 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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Application publication date: 20200918 |