CN111347190A - Ultralow-hydrogen high-strength steel welding electrode for welding refractory structural steel and preparation method thereof - Google Patents
Ultralow-hydrogen high-strength steel welding electrode for welding refractory structural steel and preparation method thereof Download PDFInfo
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- CN111347190A CN111347190A CN201811561308.8A CN201811561308A CN111347190A CN 111347190 A CN111347190 A CN 111347190A CN 201811561308 A CN201811561308 A CN 201811561308A CN 111347190 A CN111347190 A CN 111347190A
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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
- B23K35/0272—Rods, electrodes, wires with more than one layer of coating or sheathing material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3602—Carbonates, basic oxides or hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/404—Coated rods; Coated electrodes
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- Nonmetallic Welding Materials (AREA)
Abstract
The invention relates to an ultra-low hydrogen high-strength steel welding electrode for welding refractory structural steel and a preparation method thereof, and relates to the technical field of welding materials, wherein the welding electrode comprises a welding core and a coating covering the surface of the welding core, the welding core is an H08E welding electrode, and the coating comprises, by mass, 28% -32% of marble, 4% -8% of barium carbonate, 12% -18% of fluorite, 1% -3% of zircon, 4% -7% of electrolytic manganese, 5% -10% of low-silicon ferrosilicon, 5% -8% of nickel powder, 3% -6% of ferromolybdenum, 0.4% -0.8% of metallic chromium, 0.3% -0.8% of rare earth oxide, 0.4% -0.6% of copper powder and 15% -20% of iron powder.
Description
Technical Field
The invention relates to the technical field of welding materials, in particular to an ultralow-hydrogen high-strength steel welding electrode for welding refractory structural steel and a preparation method thereof.
Background
The steel structure is used as an important structural form of modern buildings, and has the advantages of high strength, large bearing capacity, good reliability, light weight, convenience and quickness in construction, energy conservation, environmental friendliness and the like, so that the steel structure has huge market and wide development prospect. In recent years, with the steady increase of steel yield and the deep research of global application technology, steel structures are more and more widely applied to the construction industry.
Although steel structures have many advantages, they also have a major drawback, namely poor fire protection. Although steel is a non-combustible material, the steel is not fire-resistant, the fire resistance limit is only 15 minutes, and members made of the steel can lose bearing capacity in a fire disaster to cause the collapse of the whole building, thereby bringing about serious casualties and economic losses, so that the development and development of fire-resistant steel are started in various countries.
As the name suggests, the refractory steel is added with partial alloy, so that the refractory steel can still maintain higher strength level at the high temperature of 350-600 ℃ for 1-3 hours, thereby improving the safety of buildings. At present, no better welding material exists for the refractory steel, so that the refractory steel has stronger structural performance.
Disclosure of Invention
The invention aims to provide an ultralow-hydrogen high-strength steel welding electrode for welding refractory structural steel and a preparation method thereof, aiming at the defects and the defects of the prior art, wherein the welding electrode has good mechanical property and crack resistance of weld metal under the condition of × 3 hours at 600 ℃.
In order to achieve the purpose, the invention adopts the following technical scheme: the welding wire comprises a core wire and a coating wrapped on the surface of the core wire, wherein the core wire is an H08E welding rod, and the coating of the welding rod comprises the following components in percentage by mass: 28-32% of marble, 4-8% of barium carbonate, 12-18% of fluorite, 1-3% of zirconite, 4-7% of electrolytic manganese, 5-10% of low-silicon ferrosilicon, 5-8% of nickel powder, 3-6% of ferromolybdenum, 0.4-0.8% of chromium metal, 0.3-0.8% of rare earth oxide, 0.4-0.6% of copper powder and 15-20% of iron powder.
According to the mass percentage, the method comprises the following steps:
H08E core wire: less than or equal to 0.06 percent of C, 0.35 to 0.60 percent of Mn, less than or equal to 0.03 percent of Si, less than or equal to 0.010 percent of S, less than or equal to 0.010 percent of P, and the balance of Fe;
and (3) marble: more than or equal to 98.0 percent of CaCO3, less than or equal to 0.010 percent of S and less than or equal to 0.010 percent of P;
barium carbonate: more than or equal to 98.5 percent of BaCO3, less than or equal to 0.40 percent of SO42-, and less than or equal to 0.30 percent of water;
fluorite: 95.0 percent or more of CaF2, 1.5 percent or less of SiO2, 1.5 percent or less of CaCO3, 0.03 percent or less of S and 0.03 percent or less of P;
zircon: ZrO2 is more than or equal to 60.0 percent, SiO2 is less than or equal to 32.0 percent, Al2O3 is less than or equal to 1.2 percent, S is less than or equal to 0.03 percent, and P is less than or equal to 0.03 percent;
electrolytic manganese: more than or equal to 99.7 percent of Mn, less than or equal to 0.04 percent of C, less than or equal to 0.005 percent of P, less than or equal to 0.02 percent of S, less than or equal to 0.010 percent of Si and less than or equal to 0.03 percent of Fe;
low-silicon ferrosilicon: 42.0 to 47.0 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.02 percent of S and less than or equal to 0.7 percent of Mn;
nickel powder: more than or equal to 98.0 percent of Ni, less than or equal to 0.025 percent of C, less than or equal to 0.01 percent of S and less than or equal to 0.01 percent of P;
ferromolybdenum: mo is more than or equal to 55.0 percent, Si is less than or equal to 1.0 percent, S is less than or equal to 0.05 percent, P is less than or equal to 0.05 percent, C is less than or equal to 0.20 percent, and Cu is less than or equal to 0.5 percent;
metallic chromium: more than or equal to 99.0 percent of Cr, less than or equal to 0.02 percent of C, less than or equal to 0.01 percent of P, less than or equal to 0.02 percent of S, less than or equal to 0.020 percent of Si, and less than or equal to 0.20 percent of Fe.
The mass of the coating of the welding rod accounts for 34-38% of the total mass of the welding rod.
The preparation method of welding electrode for welding ultralow-hydrogen high-strength steel of refractory structural steel is characterized by that before the welding electrode is pressed, the zircon is undergone the process of high-temp. baking treatment at 850-950 deg.C, then the medicinal powder components of coating are uniformly mixed according to a certain proportion, and the potassium-sodium type water glass is used as binding agent, and its added quantity is 18% -26% of total weight of coating, and then the above-mentioned materials are stirred, pressed and finally low-temp., medium-temp. and high-temp. baking treatment is made into the invented welding electrode.
The zircon is baked for 30 minutes at the high temperature of 850-950 ℃ before the welding rod is pressed.
The low temperature is 50-90 ℃, the medium temperature is 90-150 ℃, and the high temperature is 350-400 ℃.
The concentration of the potassium-sodium type water glass is 39-41 DEG Be', the modulus is 2.9-3.3, the specific gravity is 1.8-2.2, and the mass ratio of potassium to sodium is 3: 1.
After the technical scheme is adopted, the invention has the beneficial effects that the content of the diffusible hydrogen of the welding rod is below 4.0ml/100g (mercury method), and under the condition of 600 ℃ of × 3h, the welding seam metal with excellent mechanical property and crack resistance can be obtained, thus being suitable for all-position welding process operation.
Detailed Description
The technical scheme adopted by the specific implementation mode is as follows:
the welding electrode for welding the ultralow-hydrogen high-strength steel of the refractory structural steel comprises a core wire and a coating wrapped on the surface of the core wire, wherein the core wire is an H08E welding electrode, and the coating of the welding electrode comprises the following components in percentage by mass: 28-32% of marble, 4-8% of barium carbonate, 12-18% of fluorite, 1-3% of zirconite, 4-7% of electrolytic manganese, 5-10% of low-silicon ferrosilicon, 5-8% of nickel powder, 3-6% of ferromolybdenum, 0.4-0.8% of chromium metal, 0.3-0.8% of rare earth oxide, 0.4-0.6% of copper powder and 15-20% of iron powder.
According to the mass percentage, the method comprises the following steps:
H08E core wire: less than or equal to 0.06 percent of C, 0.35 to 0.60 percent of Mn, less than or equal to 0.03 percent of Si, less than or equal to 0.010 percent of S, less than or equal to 0.010 percent of P, and the balance of Fe;
and (3) marble: more than or equal to 98.0 percent of CaCO3, less than or equal to 0.010 percent of S and less than or equal to 0.010 percent of P;
barium carbonate: more than or equal to 98.5 percent of BaCO3, less than or equal to 0.40 percent of SO42-, and less than or equal to 0.30 percent of water;
fluorite: 95.0 percent or more of CaF2, 1.5 percent or less of SiO2, 1.5 percent or less of CaCO3, 0.03 percent or less of S and 0.03 percent or less of P;
zircon: ZrO2 is more than or equal to 60.0 percent, SiO2 is less than or equal to 32.0 percent, Al2O3 is less than or equal to 1.2 percent, S is less than or equal to 0.03 percent, and P is less than or equal to 0.03 percent;
electrolytic manganese: more than or equal to 99.7 percent of Mn, less than or equal to 0.04 percent of C, less than or equal to 0.005 percent of P, less than or equal to 0.02 percent of S, less than or equal to 0.010 percent of Si and less than or equal to 0.03 percent of Fe;
low-silicon ferrosilicon: 42.0 to 47.0 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.02 percent of S and less than or equal to 0.7 percent of Mn;
nickel powder: more than or equal to 98.0 percent of Ni, less than or equal to 0.025 percent of C, less than or equal to 0.01 percent of S and less than or equal to 0.01 percent of P;
ferromolybdenum: mo is more than or equal to 55.0 percent, Si is less than or equal to 1.0 percent, S is less than or equal to 0.05 percent, P is less than or equal to 0.05 percent, C is less than or equal to 0.20 percent, and Cu is less than or equal to 0.5 percent;
metallic chromium: more than or equal to 99.0 percent of Cr, less than or equal to 0.02 percent of C, less than or equal to 0.01 percent of P, less than or equal to 0.02 percent of S, less than or equal to 0.020 percent of Si, and less than or equal to 0.20 percent of Fe.
The mass of the coating of the welding rod accounts for 34-38% of the total mass of the welding rod.
The preparation method of welding electrode for welding ultralow-hydrogen high-strength steel of refractory structural steel is characterized by that before the welding electrode is pressed, the zircon is undergone the process of high-temp. baking treatment at 850-950 deg.C, then the medicinal powder components of coating are uniformly mixed according to a certain proportion, and the potassium-sodium type water glass is used as binding agent, and its added quantity is 18% -26% of total weight of coating, and then the above-mentioned materials are stirred, pressed and finally low-temp., medium-temp. and high-temp. baking treatment is made into the invented welding electrode.
The zircon is baked for 30 minutes at the high temperature of 850-950 ℃ before the welding rod is pressed.
The low temperature is 50-90 ℃, the medium temperature is 90-150 ℃, and the high temperature is 350-400 ℃.
The concentration of the potassium-sodium type water glass is 39-41 DEG Be', the modulus is 2.9-3.3, the specific gravity is 1.8-2.2, and the mass ratio of potassium to sodium is 3: 1.
The steel core is a welding core for an H08E welding rod, wherein C is less than or equal to 0.06%.
The low-hydrogen type welding rod coating accounts for 34-38% of the total mass of the welding rod. The coating comprises CaO-CaF2-SiO2 slag system and adopts Mn-Si-Ni-Cr-Mo-Cu alloy system.
The invention aims to ensure that the content of diffusible hydrogen in weld metal is less than or equal to 4.0ml/100g (mercury method), and the mass fraction of carbonate in the coating component is improved. The carbonate decomposes in the arc atmosphere to generate CO2 to isolate the molten pool from the air, thus preventing harmful gases such as H2, O2, N and the like in the air from corroding the weld metal and reducing the gas partial pressure of each harmful gas component in the arc atmosphere. In addition, part of the additives are subjected to high-temperature pretreatment before the welding rod is pressed, the total amount of carbonate is limited to 32-40%, and the content of diffused hydrogen of the weld metal is guaranteed to be below 4.0ml/100g (mercury method).
By adopting a Mn-Si-Ni-Cr-Mo-Cu alloy system, the mass percent of Ni and Mo in weld metal is improved, proper Cr and Cu and 0.3-0.8% of rare earth oxide are added into a coating, the content of C in a welding core is controlled, the weld metal is promoted to form fine lower bainite and low-C martensite, the form of inclusions in the weld metal is reduced, the inclusions are in fine spherical and dispersed distribution, and the weld metal is purified.
The function of the Chinese medicine skin component of the invention is explained in detail as follows:
(1) the coating of the welding rod adopts CaO-CaF2-SiO2 slag system, and the coating contains a large amount of carbonates with different decomposition temperatures. Including marble, barium carbonate, and the like. The carbonate is decomposed under the high-temperature condition of the electric arc to generate CO2, so that the corrosion of harmful gases such as H2, O2 and N in the air to weld metal is prevented, and the gas partial pressure of harmful gas components such as H2, O2 and N in the electric arc atmosphere is reduced. Meanwhile, due to the existence of CO2, the arc stiffness of the welding rod in the vertical welding operation process is improved, and the operation performance of all-position welding is improved. Basic oxides such as CaO, BaO and the like generated in the high-temperature reaction process play a positive role in the desulfurization of weld metal.
(2) The fluorite in the coating component reduces the melting point of the slag and improves the fluidity of the slag. F-is decomposed from fluorite under the high-temperature environment of the electric arc, so that the hydrogen content of the weld metal is effectively reduced, and the low hydrogenation of the weld metal is realized. The fluorite content is too high to be beneficial to the operability of the vertical welding position and reduce the stability of the electric arc.
(3) C is an important element for improving the strength of the weld metal, and the invention finds that the content of C in the weld metal is strictly controlled in the high-strength steel welding process, the C in the weld metal exceeds 0.08, the strength of the weld metal is improved under the test condition of × 3h at 600 ℃, the low-temperature impact toughness is reduced, and the low-temperature crack sensitivity is obviously improved.
(4) The Mn and Si contents improve the strength and the deoxidizing property of the weld metal, and simultaneously can effectively improve the low-temperature toughness of the weld metal, when the Si content in the coating component is too low, the weld metal is not deoxidized enough, so that the number of non-metallic inclusions in the weld metal is increased, the improvement of the low-temperature toughness is not facilitated, and pores are easily generated; in addition, when the Mn content in the coating component is too high, the metal strength of the welding seam is excessive, and the low-temperature toughness is reduced.
(5) The Ni and the Mo are added for improving the low-temperature toughness of the weld metal and ensuring the yield strength of the weld metal, when the contents of the Ni and the Mo are too low, the low-temperature toughness of the weld metal cannot be fully improved, the yield strength is lower than the standard requirement, when the contents of the Ni and the Mo exceed the upper limit, the strength of the weld metal is increased, the low-temperature toughness is deteriorated, and the risk of hot cracking is increased due to the too high content of the Ni in the weld metal.
(6) Cr is added together with Ni to improve hardenability, and Cr improves weld heat resistance. The Cr element can improve the content of acicular ferrite in a weld joint, reduce the content of proeutectoid ferrite and refine ferrite grains, thereby improving the strength and the toughness. Although Cr has a strong solid solution strengthening effect, it increases the brittle transition temperature of steel and decreases weldability. Therefore, the Cr content is controlled to O.4-0.8% in the invention.
(7) Cu is a precipitation strengthening element and can improve the yield strength of the weld metal, the weld metal is toughened when the Cu content in the weld metal reaches 0.4-0.6%, and the impact toughness of the weld metal is greatly reduced when the Cu content reaches 1.2%. Therefore, the Cu content is controlled to O.4-0.6% in the invention.
Preferably, the medicinal skin comprises the following components in parts by weight:
the welding rod coating comprises, by mass, 28-32% of marble, 4-8% of barium carbonate, 12-18% of fluorite, 1-3% of zircon, 4-7% of electrolytic manganese, 5-10% of low-silicon ferrosilicon, 5-8% of nickel powder, 3-6% of ferromolybdenum, 0.4-O.8% of chromium metal, 0.3-0.8% of rare earth oxide, 0.4-0.6% of copper powder and 15-20% of iron powder.
The technical scheme is as follows: the components of the powder are uniformly mixed, potassium-sodium mixed water glass is used as a binder, the addition amount is 18-26% of the total weight of the coating, after uniform stirring, special equipment for welding rod industry production is adopted, the powder is uniformly coated on a welding core according to the specified outer diameter of a welding rod, after a clamping end and an arc striking end are ground, a welding rod drying furnace is used for drying at three stages of low temperature of 50-90 ℃, medium temperature of 90-150 ℃ and high temperature of 350-400 ℃, and the high-strength steel welding rod for the low-temperature steel is obtained.
Example 1
Stirring and mixing the medicinal powder uniformly, adding 3: 1 potassium-sodium water glass with the modulus of 3.O at 39-41 ℃ Be' into the mixture, stirring the mixture, placing the mixture into a press coating machine to coat the mixture on a welding core after uniform mixing, and drying the mixture by using a welding rod drying furnace at three stages of low temperature of 50-90 ℃, medium temperature of 90-150 ℃ and high temperature of 350-400 ℃. The obtained welding rod has smooth surface, stable eccentricity and good coating strength, and the obtained welding rod is welded, so that the welding rod is attractive in appearance, small in splashing and stable in electric arc.
The mechanical properties of the welding rod deposited metal of example 1 under the condition of 600 ℃ for × 3h are that Rm is 832, Rel is 730, A is 18.0, impact energy KV2 is 86J, 88J and 86J respectively, and the radiographic inspection is qualified.
Example 2
Stirring and mixing the medicinal powder uniformly, adding 3: 1 potassium-sodium water glass with the modulus of 3.O at 39-41 ℃ Be' into the mixture, stirring the mixture, placing the mixture into a press coating machine to coat the mixture on a welding core after uniform mixing, and drying the mixture by using a welding rod drying furnace at three stages of low temperature of 50-90 ℃, medium temperature of 90-150 ℃ and high temperature of 350-400 ℃. The obtained welding rod has smooth surface, stable eccentricity and good coating strength, and the obtained welding rod is welded, so that the welding rod is attractive in appearance, small in splashing and stable in electric arc.
The mechanical properties of the welding rod deposited metal of the embodiment 2 under the condition of 600 ℃ of × 3h are that Rm is 826, Rel is 722, A is 17.5, impact energy KV2 is 72J, 76J and 72J respectively, and the welding rod deposited metal is qualified by radiographic inspection.
Example 3
Stirring and mixing the medicinal powder uniformly, adding 3: 1 potassium-sodium water glass with the modulus of 3.0 at 39-41 ℃ Be', stirring, uniformly mixing, putting the mixture into a press coating machine to coat the mixture on a welding core, and drying the mixture by using a welding rod drying furnace at three stages of low temperature of 50-90 ℃, medium temperature of 90-150 ℃ and high temperature of 350-400 ℃. The obtained welding rod has smooth surface, stable eccentricity and good coating strength, and the obtained welding rod is welded, so that the welding rod is attractive in appearance, small in splashing and stable in electric arc.
The mechanical properties of the welding rod deposited metal of example 3 under the condition of 600 ℃ for × 3h are that Rm is 840, Rel is 736, A is 18.5, impact energy KV2 is respectively 90J, 92J and 92J, and the radiographic inspection is qualified.
Example 4
Stirring and mixing the medicinal powder uniformly, adding 3: 1 potassium-sodium water glass with the modulus of 3.0 at 39-41 ℃ Be', stirring, uniformly mixing, putting the mixture into a press coating machine to coat the mixture on a welding core, and drying the mixture by using a welding rod drying furnace at three stages of low temperature of 50-90 ℃, medium temperature of 90-150 ℃ and high temperature of 350-400 ℃. The obtained welding rod has smooth surface, stable eccentricity and good coating strength, and the obtained welding rod is welded, so that the welding rod is attractive in appearance, small in splashing and stable in electric arc.
The mechanical properties of the welding rod deposited metal of example 4 under the condition of 600 ℃ for × 3h are that Rm is 818, Rel is 712, A is 18.5, impact energy KV2 is 70J, 70J and 72J respectively, and the radiographic inspection is qualified.
The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. The utility model provides an ultralow hydrogen high strength steel welding electrode for welding fire resistant structural steel, contains the core wire and wraps up and cover the coating composition on the core wire surface, its characterized in that: the welding core is an H08E welding rod, and the welding rod coating comprises the following components in percentage by mass: 28-32% of marble, 4-8% of barium carbonate, 12-18% of fluorite, 1-3% of zirconite, 4-7% of electrolytic manganese, 5-10% of low-silicon ferrosilicon, 5-8% of nickel powder, 3-6% of ferromolybdenum, 0.4-0.8% of chromium metal, 0.3-0.8% of rare earth oxide, 0.4-0.6% of copper powder and 15-20% of iron powder.
2. The electrode for welding ultra-low hydrogen high strength steel for fire resistant structural steel as claimed in claim 1, wherein: according to the mass percentage, the method comprises the following steps:
H08E core wire: less than or equal to 0.06 percent of C, 0.35 to 0.60 percent of Mn, less than or equal to 0.03 percent of Si, less than or equal to 0.010 percent of S, less than or equal to 0.010 percent of P, and the balance of Fe;
and (3) marble: more than or equal to 98.0 percent of CaCO3, less than or equal to 0.010 percent of S and less than or equal to 0.010 percent of P;
barium carbonate: more than or equal to 98.5 percent of BaCO3, less than or equal to 0.40 percent of SO42-, and less than or equal to 0.30 percent of water;
fluorite: 95.0 percent or more of CaF2, 1.5 percent or less of SiO2, 1.5 percent or less of CaCO3, 0.03 percent or less of S and 0.03 percent or less of P;
zircon: ZrO2 is more than or equal to 60.0 percent, SiO2 is less than or equal to 32.0 percent, Al2O3 is less than or equal to 1.2 percent, S is less than or equal to 0.03 percent, and P is less than or equal to 0.03 percent;
electrolytic manganese: more than or equal to 99.7 percent of Mn, less than or equal to 0.04 percent of C, less than or equal to 0.005 percent of P, less than or equal to 0.02 percent of S, less than or equal to 0.010 percent of Si and less than or equal to 0.03 percent of Fe;
low-silicon ferrosilicon: 42.0 to 47.0 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.02 percent of S and less than or equal to 0.7 percent of Mn;
nickel powder: more than or equal to 98.0 percent of Ni, less than or equal to 0.025 percent of C, less than or equal to 0.01 percent of S and less than or equal to 0.01 percent of P;
ferromolybdenum: mo is more than or equal to 55.0 percent, Si is less than or equal to 1.0 percent, S is less than or equal to 0.05 percent, P is less than or equal to 0.05 percent, C is less than or equal to 0.20 percent, and Cu is less than or equal to 0.5 percent;
metallic chromium: more than or equal to 99.0 percent of Cr, less than or equal to 0.02 percent of C, less than or equal to 0.01 percent of P, less than or equal to 0.02 percent of S, less than or equal to 0.020 percent of Si, and less than or equal to 0.20 percent of Fe.
3. The electrode for welding ultra-low hydrogen high strength steel for fire resistant structural steel as claimed in claim 1, wherein: the mass of the coating of the welding rod accounts for 34-38% of the total mass of the welding rod.
4. A preparation method of an ultralow-hydrogen high-strength steel welding electrode for welding refractory structural steel is characterized by comprising the following steps of: the zirconite is baked at 850-950 deg.c before pressing welding rod, and the coating is prepared through mixing the components in certain proportion, mixing with potassium-sodium water glass as adhesive in the amount of 18-26 wt% of the coating, stirring, pressing welding rod, and low temperature, medium temperature and high temperature baking.
5. The method for manufacturing an electrode for ultra-low hydrogen high-strength steel for welding fire-resistant structural steel as claimed in claim 4, wherein: the zircon is baked for 30 minutes at the high temperature of 850-950 ℃ before the welding rod is pressed.
6. The method for manufacturing an electrode for ultra-low hydrogen high-strength steel for welding fire-resistant structural steel as claimed in claim 4, wherein: the low temperature is 50-90 ℃, the medium temperature is 90-150 ℃, and the high temperature is 350-400 ℃.
7. The method for manufacturing an ultra-low hydrogen high-strength steel welding electrode for welding fire-resistant structural steel as claimed in claim 4, wherein the concentration of the potassium-sodium type water glass is 39-41 ° Be', the modulus is 2.9-3.3, the specific gravity is 1.8-2.2, and the mass ratio of potassium to sodium is 3: 1.
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