CN112548397A - Heat-resistant steel argon arc welding wire for gasification furnace and preparation method thereof - Google Patents
Heat-resistant steel argon arc welding wire for gasification furnace and preparation method thereof Download PDFInfo
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- CN112548397A CN112548397A CN202011419183.2A CN202011419183A CN112548397A CN 112548397 A CN112548397 A CN 112548397A CN 202011419183 A CN202011419183 A CN 202011419183A CN 112548397 A CN112548397 A CN 112548397A
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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
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
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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
Abstract
The invention belongs to the technical field of welding materials, and provides a heat-resistant steel argon arc welding wire for a gasification furnace, which comprises the following components in percentage by weight: c: 0.07 percent to 0.12 percent; mn: 0.40% -0.70%; si: 0.40% -0.70%; mo: 0.40% -0.65%; cr: 1.20% -1.50%; s is more than 0 and less than or equal to 0.010 percent; p is more than 0 and less than or equal to 0.010 percent; ni is more than 0 and less than or equal to 0.20 percent; cu is more than 0 and less than or equal to 0.20 percent; al is more than 0 and less than or equal to 0.050 percent; v is more than 0 and less than or equal to 0.050 percent; the balance being Fe and other unavoidable impurities. The invention also provides a preparation method of the heat-resistant steel argon arc welding wire for the gasification furnace. The argon arc welding wire prepared by the invention is smooth in drawing, appropriate in welding wire stiffness and excellent in surface quality, is used for welding heat-resistant steel of a gasification furnace, has high heat resistance, and particularly has more excellent mechanical properties at a high temperature state. Can meet the welding requirement of equipment in service under high-temperature and high-pressure conditions such as gasification furnaces in China, and realizes the localization of welding materials in the field.
Description
Technical Field
The invention relates to the technical field of welding wire preparation, in particular to a heat-resistant steel argon arc welding wire for a gasification furnace and a preparation method thereof.
Background
In recent years, with the rapid development of modern scientific technology and the rapid development of nuclear power and thermal power technologies in China, heat-resistant steel with high strength and high toughness is more and more widely applied to the fields of boilers, pressure vessels and the like. In recent years, the demand of large-scale equipment such as gasification furnaces and the like for welding materials in China is greatly increased, such as energy-gathering methanation equipment, gasification furnaces and the like. The equipment needs to be used under the conditions of high temperature and high pressure, so the requirement on welding materials is extremely high, and the higher normal temperature and high temperature performance needs to be achieved under the extremely harsh heat treatment condition.
In order to match with large-scale equipment such as a gasification furnace and the like, the welding material industry is very necessary to develop welding material products with excellent welding process performance and mechanical property.
Disclosure of Invention
The invention aims to provide a heat-resistant steel argon arc welding wire for a gasification furnace and a preparation method thereof, the welding wire can be suitable for welding heat-resistant steel for the gasification furnace, and weld metal obtained by welding has excellent heat-resistant and high-temperature-resistant properties.
In order to achieve the purpose, the invention adopts the technical scheme that:
a heat-resistant steel argon arc welding wire for a gasification furnace comprises the following components in percentage by weight:
c: 0.07 percent to 0.12 percent; mn: 0.40% -0.70%; si: 0.40% -0.70%; mo: 0.40% -0.65%; cr: 1.20% -1.50%; s is more than 0 and less than or equal to 0.010 percent; p is more than 0 and less than or equal to 0.010 percent; ni is more than 0 and less than or equal to 0.20 percent; cu is more than 0 and less than or equal to 0.20 percent; al is more than 0 and less than or equal to 0.050 percent; v is more than 0 and less than or equal to 0.050 percent; the balance being Fe and other unavoidable impurities.
Wherein the preferable formula is as follows:
the components with the following weight percentages: c: 0.09%; mn: 0.70 percent; si: 0.50 percent; mo: 0.60 percent; cr: 1.25 percent; 0.008 percent of S; 0.010 percent of P; 0.15 percent of Ni; 0.15 percent of Cu; 0.040 percent of Al; v, 0.035%; the balance being Fe and other unavoidable impurities.
The components with the following weight percentages: c: 0.08 percent; mn: 0.50 percent; si: 0.65 percent; mo: 0.45 percent; cr: 1.45 percent; 0.010 percent of S; 0.008 percent of P; 0.15 percent of Ni; 0.05 percent of Cu; 0.040 percent of Al; v, 0.035%; the balance being Fe and other unavoidable impurities.
The components with the following weight percentages: c: 0.10 percent; mn: 0.60 percent; si: 0.59 percent; mo: 0.42 percent; cr: 1.33 percent; s: 0.006%; p: 0.0081%; ni: 0.052 percent; cu: 0.086%; al: 0.006%; v: 0.004%; the balance being Fe and other unavoidable impurities.
And the following components in percentage by weight: c: 0.10 percent; mn: 0.55 percent; si: 0.50 percent; mo: 0.50 percent; cr: 1.22 percent; s: 0.006%; p: 0.010%; ni: 0.10 percent; cu: 0.086%; al: 0.006%; v: 0.02 percent; the balance being Fe and other unavoidable impurities.
The invention designs an argon arc welding wire which takes Cr-Mo as a main alloy system and is matched with multiple elements for strengthening, the argon arc welding wire is mainly used for welding heat-resistant steel of a gasification furnace, and particularly, in the argon arc welding wire of the invention:
chromium is added as a main alloy element and mainly has the following functions: chromium element and carbon form dispersed carbide, and the dispersed carbide can effectively improve the strength of the welding seam; chromium element is also beneficial to improving the content of acicular ferrite, reducing proeutectoid ferrite, refining ferrite grains and improving the toughness of welding seams; chromium also helps to maintain the weld properties at a high level after heat treatment. The inventors of the present invention have found that, when Cr is excessively high, acicular ferrite in the deposited metal is rapidly reduced during welding, resulting in homogenization of the microstructure in the coarse and fine crystal regions of the deposited metal, ferrite/carbide aggregates are formed in the incomplete phase transformation region, and although the weld hardness, yield point, and tensile strength are improved to some extent, toughness of the deposited metal is deteriorated to a great extent, which affects the overall performance of the deposited metal. Therefore, the content of the chromium element in the welding wire is controlled to be 1.20-1.50%, the strength and the toughness of the welding line can be improved, excellent heat treatment performance is ensured, the welding wire has high normal-temperature and high-temperature tensile properties, and the balance of the toughness and the strength of the welding wire is optimal.
Molybdenum is added as another main alloy element, so that crystal grains can be refined, and the metal strength, high-temperature resistance, oxidation resistance and creep resistance of the welding line are effectively improved. Mo is a medium-strong carbide forming element, a proper amount of Mo can reduce a gamma phase region, and the Mo exists in a form of solid solution in a matrix or carbide, so that the Mo strongly inhibits P transformation and also has an inhibiting effect on formation of pro-eutectoid ferrite. With the increase of Mo content in the welding seam, the eutectoid ferrite in the welding seam is gradually reduced, the acicular ferrite is gradually increased and then reduced, common grains in a coarse crystal area and a fine crystal area are refined, ferrite and carbide clusters are formed in an incomplete phase change area, the strength and the like of the welding seam are improved, the content of Mn and Cr elements is matched, and 0.40-0.65% of Mo is most beneficial to the toughness. 1.20 to 1.50 percent of chromium and 0.40 to 0.65 percent of molybdenum are matched to form a Cr-Mo alloy system, and the heat resistance and the ductility and toughness of welding can be effectively ensured under the matching of other elements.
The carbon, manganese and silicon elements are added as other strengthening alloy elements, and have the functions of deoxidizing, strengthening the structure of a weld joint and ensuring the mechanical property of deposited metal in the welding process. Particularly, the tensile strength is increased along with the increase of the contents of carbon and manganese in the welding wire, and the increase of the manganese can effectively improve the air hole sensitivity of the welding line. The gasification furnace has the advantages that the carbon, manganese and silicon content is high, the carbon (0.07-0.12%), the manganese (0.40-0.70%) and the silicon (0.40-0.70%) are matched in a certain proportion, the sufficient strength of the welded material under the service condition of the gasification furnace can be ensured, and the impact toughness of the welded material can be effectively improved.
The contents of S and P are strictly controlled to be 0< S < 0.010% and 0< P < 0.010%, if the contents are too high, the impact toughness of deposited metal is influenced, and cracks are easy to generate.
The nickel element is added as a trace element, so that ferrite can be strengthened and pearlite can be refined, the nickel element can improve the strength of the weld metal to a certain extent, and the nickel with the content of more than 0 and less than or equal to 0.20 percent and the chromium with the content of 1.20 to 1.50 percent have synergistic effect to improve the strength of the weld metal. The addition of nickel can also improve the fatigue resistance of the welding line, reduce the sensitivity to gaps, reduce the low-temperature brittle transition temperature of the welding line and improve the corrosion resistance of the welding line metal to acid, alkali, atmosphere and salt.
Vanadium is added as a trace element, has the functions of deoxidation and denitrification in the welding process, can effectively improve the high-temperature strength of a welding line, limits the growth of crystal grains during heating, can also effectively improve the density of the welding line, promotes the refinement of the crystal grains, improves the mechanical strength, the ultimate yield point and the impact toughness, but does not reduce the ductility of the welding line, can reduce the aging sensitivity of the welding line after the vanadium is combined with oxygen, and improves the hardness, the wear resistance, the tempering strength and the thermal stability. But also can improve the red hardness of the welding seam and ensure that the carbide is uniformly distributed in the welding seam.
The trace aluminum in the welding wire has the functions of solidifying the structure, stabilizing the electric arc, deoxidizing and fixing nitrogen.
The copper has the prominent effect of improving the atmospheric corrosion resistance of common low-alloy steel, particularly the copper is matched with phosphorus for use, and the strength and yield ratio of the steel can be improved by adding the copper.
Although Cr-Mo is used as a main alloy system and is matched with a multi-element reinforced argon arc welding wire, in the welding wire design process, the low contents of chromium and molybdenum elements are designed, the content of reinforced metal carbon, silicon and manganese is increased in a proper amount, and meanwhile, elements such as nickel, vanadium, copper and the like are matched in a proper proportion. The elements are matched with each other, so that the welding wire has enough strength (the tensile strength is more than or equal to 550MPa, and the yield strength is more than or equal to 470MPa) under the heat treatment conditions of 690 ℃ multiplied by 18h, 680 ℃ multiplied by 3h and the like on the premise of ensuring that the welding wire achieves the required high plasticity and toughness performance. Thereby meeting the requirement that the weld joint yield strength in energy-gathering methane equipment and gasification furnace equipment (380 ℃, 450 ℃ and 510 ℃ high-temperature service environment) reaches 328 or above and far exceeds the domestic relevant high-temperature tensile yield strength.
The application also provides a preparation method of the heat-resistant steel argon arc welding wire for the gasification furnace, which comprises the following steps: (a) preparing a wire rod, and roughly drawing the wire rod; (b) annealing the wire rod treated in the step (a) to remove an oxide layer on the surface of the wire rod; (c) finely drawing the wire rod processed in the step (b); (d) and (c) carrying out surface copper plating, shredding and coding on the wire rod subjected to fine drawing in the step (c) to obtain a final product.
Further, in the step (a), the diameter of the wire rod after rough drawing is 4.1 mm;
further, the annealing treatment process in the step (b) comprises: a temperature rising stage: heating to 620 +/-15 ℃ at the heating rate of 100-150 ℃/h, and preserving heat for 5-8 h; a first cooling stage: cooling to below 500 ℃ along with the furnace, preferably to 480 ℃, wherein the cooling speed is 25-30 ℃/h; and a second cooling stage: opening a furnace cover, and quickly cooling to below 150 ℃, preferably 120 ℃; and (4) discharging. In the temperature raising stage and the first cooling stage, at a temperature of 3.2-6m3Nitrogen with a purity of 99.99% was introduced at a rate of/h. Nitrogen is inert gas, and can be used for heatingThe wire rod is isolated from air to protect the wire rod from oxidation. And (4) annealing treatment is carried out by adopting a well type annealing furnace with rated power not less than 105 KW.
Further, in the step (c), the fine drawing process comprises coating boron on the surface of the wire rod by adopting boron liquid, drying at the temperature of 100 ℃ and 120 ℃, matching with drawing powder, and drawing for 3-8 times; the content of borax in the boron liquid is 350-550g/L, and the temperature of the boron liquid is 60-80 ℃.
Further, in the step (d), the copper plating solution used in the copper plating process is 30-45g/L copper sulfate solution, and the copper plating speed is 2.0-5.0 m/s.
Further, in step (d), the final product specifications include 0.8mm, 1.0mm, 1.2mm, 1.6mm, 2.0mm, 2.4mm, and 2.5 mm. The specifications of the final product are phi 0.8mm, phi 1.0mm, phi 1.2mm and phi 1.6mm, and the final product is packaged in a plastic disc packaging mode, and phi 2.0mm, phi 2.4mm and phi 2.5mm are all packaged in a plastic box mode, wherein the lengths of the end parts of the final product are 1.0m, and steel-character nails are used for printing product models.
The wire rod prepared by the welding wire component provided by the invention has high tensile strength and poor plasticity, and in the cold drawing process of the wire rod, the die consumption is high, the wire is easy to break, the production efficiency is low, and the drawing process is not smooth. Therefore, in order to ensure smooth production of the welding wire and quality of the finished welding wire, the wire rod is subjected to primary annealing treatment after the original wire rod is drawn to phi 4.1 mm.
The annealing process adopted by the invention is a recrystallization annealing process, because the Cr-Mo alloy has solid phase change (recrystallization) during balanced heating and cooling, the alloy undergoes phase change recrystallization once during heating and cooling respectively during the process of slowly heating, preserving heat and cooling the wire rod in the annealing furnace, thereby completing the whole recrystallization annealing process; the annealing process enhances the plasticity of the wire rod, reduces the hardness, improves the drawing performance and provides good conditions for the subsequent fine drawing.
The wire rod can be softened by high-temperature annealing for a long time, and the wire rod is softened in a controllable range by designing and optimizing annealing process parameters, so that the hardness is reduced, and good drawing plasticity is obtained. When the annealing temperature is too low, the wire rod is not completely austenitized, the annealing is not sufficient, the internal stress is not completely eliminated, the phase change recrystallization is not complete, the tensile strength and hardness of the annealed wire rod are still high, the plasticity is low, and the wire rod is not beneficial to drawing. When the annealing temperature is too high, the internal structure of the wire rod is fully austenitized, so that internal stress is eliminated, but the excessive temperature causes primary carbide to grow, large-size carbide particles form internal defects, so that the drawing plasticity of the wire rod is damaged, and micro-cracks are generated in the drawing process to cause drawing brittle failure. The annealing heating temperature of the invention is designed to be 620 +/-15 ℃, and the drawing plasticity of the wire rod can be effectively ensured.
In addition to the change of the annealing heating temperature to the plasticity of the wire rod, the annealing heat preservation time is another important factor for ensuring the plasticity of the annealed wire rod, the heat preservation time is too short, so that the annealing is incomplete, and the heat preservation time is too long, so that carbide particles are coarsened in sequence, and the plasticity of the wire rod is reduced. The heat preservation time is set to be 5-8h, the wire rod matrix is fully austenitized in the time range, the stress is eliminated, and the wire rod is completely annealed, so that the hardness and the tensile strength of the wire rod are not greatly changed, primary carbide particles cannot be coarsened, and the plasticity of the wire rod is ensured.
In conclusion, the preparation method of the invention well matches the components of the welding wire of the invention, and designs the annealing method matched with the components of the welding wire of the invention in an emphatic way, so as to ensure that the welding wire of the invention with excellent performance can be prepared smoothly.
The invention has the beneficial effects that:
the heat-resistant steel argon arc welding wire for the gasification furnace is used for welding SA _387GR11CL2 and other materials, can enable the components of weld metal to reach the optimal state through a reasonable welding process, and has the advantages of excellent welding process performance, attractive and fine forming, smooth transition of the weld edge and good metal luster; the chemical composition and the structure of the weld metal are optimal, and the content of deposited metal S, P is low; the mechanical properties such as the normal-temperature and high-temperature tensile strength, the impact value, the bending property, the crack resistance and the like in a heat treatment state are excellent, and particularly the mechanical properties are more excellent in a high-temperature state; in addition, the argon arc welding wire prepared by the preparation method disclosed by the invention is smooth in drawing, appropriate in stiffness and excellent in surface quality.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention is further described with reference to specific embodiments below.
The components of the argon arc welding wire for heat-resistant steel are smelted and rolled in a steel plant. The wire rod belongs to a low-alloy high-strength steel wire rod, has the characteristics of high technical content, good economic benefit and the like, and meanwhile, the wire rod needs to be further drawn to be reproduced into the welding wire, so that the requirements on the smelting process used by a steel mill, the quality of steel billets, inclusions, sulfides and the like in steel are very strict.
Example 1
Preparing an original wire rod:
according to the components of the original wire rod, the original wire rod of the welding wire is obtained by related process methods (the prior art) such as a blast furnace → molten iron pre-desulfurization → electric furnace refining → continuous casting → rolling.
The original wire rod comprises the following components in percentage by weight:
c: 0.098%; mn: 0.61%; si: 0.58 percent; ni: 0.05 percent; mo: 0.41 percent; s:0.008 percent; p:0.008 percent; cr: 1.34 percent; cu: 0.078%; the balance being Fe and other unavoidable impurities.
The welding wire is prepared by the following method:
(a) preparing a wire rod, and roughly drawing the wire rod; the diameter of the wire rod after rough drawing is 4.1 mm;
(b) annealing the wire rod treated in the step (a) to remove an oxide layer on the surface of the wire rod; the annealing treatment process comprises the following steps: a temperature rising stage: heating to 620 +/-15 ℃ at the heating rate of 100-150 ℃/h, and preserving heat for 5-8 h; a first cooling stage: cooling to 480 ℃ along with the furnace, wherein the cooling speed is 25-30 ℃/h; and a second cooling stage: opening the furnace cover and quickly cooling to 120 ℃; and (4) discharging. In the temperature rise stage and the first cooling stage, at 4.5m3Nitrogen with a purity of 99.99% was introduced at a rate of/h. Annealing place by adopting well type annealing furnace with rated power not less than 105KWAnd (6) processing.
(c) Finely drawing the wire rod processed in the step (b); the fine drawing process comprises the steps of coating boron on the surface of the wire rod by adopting boron liquid, drying at the temperature of 100 ℃ and 120 ℃, matching with drawing powder, and drawing for 3-8 times; the content of borax in the boron liquid is 450g/L, and the temperature of the boron liquid is 60-80 ℃.
(d) And (c) carrying out surface copper plating, shredding and coding on the wire rod subjected to fine drawing in the step (c) to obtain a final product. The copper plating solution used in the copper plating process is 40g/L copper sulfate solution, and the copper plating speed is 3.5 m/s.
The prepared welding wire comprises the following components: c: 0.10 percent; mn: 0.60 percent; si: 0.59 percent; ni: 0.052 percent; mo: 0.42 percent; s: 0.006%; p: 0.0081%; cr: 1.33 percent; cu: 0.086%; as: 0.0042%; 0.0009 percent of Sb; sn: 0.004%; al: 0.006%; v: 0.004%; the balance being Fe and other unavoidable impurities. The specification of the welding wire is phi 2.4 mm.
Example 2
The original wire rod comprises the following components in percentage by weight:
c: 0.083%; mn: 0.48 percent; si: 0.62 percent; ni: 0.022%; mo: 0.43 percent; s:0.008 percent; p: 0.010%; cr: 1.34 percent; cu: 0.062%; the balance being Fe and other unavoidable impurities.
The prepared welding wire comprises the following components:
c: 0.080%; mn: 0.50 percent; si: 0.65 percent; mo: 0.45 percent; cr: 1.45 percent; 0.006 percent of S; 0.009% of P; 0.025 percent of Ni; 0.05 percent of Cu; al: 0.0056; v: 0.0037%; as: 0.0035%; 0.0008 percent of Sb; sn: 0.0042%; the balance being Fe and other unavoidable impurities.
The method of preparing the raw wire rod and the method of preparing the welding wire are the same as those of example 1.
Examples of the experiments
The following experiments were performed on the wires of example 1 and example 2, respectively:
experimental group a: carrying out manual argon tungsten-arc welding on a test plate (low-alloy high-strength steel) with the thickness of 16mm, and carrying out normal-temperature mechanical property test on welded deposited metal;
experimental group B: carrying out manual argon tungsten-arc welding on a test plate (low-alloy high-strength steel) with the thickness of 20mm, and carrying out heat treatment on the test plate at the temperature of 620 +/-15 ℃ for 1 h;
experimental group C: carrying out manual argon tungsten-arc welding on a test plate (low-alloy high-strength steel) with the thickness of 20mm, and carrying out heat treatment on the test plate at 680 +/-15 ℃ for 3 h;
experimental group D: carrying out manual argon tungsten-arc welding on a test plate (low-alloy high-strength steel) with the thickness of 20mm, and carrying out thermal treatment on the test plate at 690 +/-15 ℃ for 18 h;
in the above experimental groups a-D, the welding process is a welding process well known to the person skilled in the art in the prior art.
The deposited metal in the experimental groups A-D under the conditions of welding state and heat treatment state is subjected to a normal temperature tensile test, a high temperature tensile test, an impact test and a bending test to obtain the mechanical property indexes of the deposited metal in each experimental example, and in the experimental groups A-D, the bending angle of the bending test is 180 degrees, and the bending diameter is 4 times of the plate thickness. The test results are shown in table 1 below:
TABLE 1 mechanical Properties of deposited metals in the respective experimental examples
The mechanical indexes of deposited metal of the welding seams of the experimental groups A-D can be obtained, the mechanical properties such as normal-temperature and high-temperature tensile strength, impact value, bending property and the like of the welding seams in a welding state and a heat treatment state are excellent, particularly, the tensile properties at three high temperatures (380 ℃, 450 ℃ and 510 ℃) are excellent under two heat treatment states of 680 +/-15 ℃ x 3h and 690 +/-15 ℃ x 18h, the yield strength in a high-temperature tensile test reaches 328 or above, the relevant requirements that the high-temperature tensile yield strengths at 380 ℃, 450 ℃ and 510 ℃ are respectively more than or equal to 234MPa, 219MPa and 206MPa are far beyond the domestic requirements, and the lasting and reliable performance guarantee in various high-temperature service environments can be realized.
In conclusion, the argon arc welding wire prepared by the invention has the advantages of smooth drawing, proper stiffness of the welding wire, excellent surface quality, high heat resistance when being used for welding heat-resistant steel of a gasification furnace, and more excellent mechanical property particularly in a high-temperature state. Can meet the welding requirement of equipment in service under high-temperature and high-pressure conditions such as gasification furnaces in China, and realizes the localization of welding materials in the field.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A heat-resistant steel argon arc welding wire for a gasification furnace is characterized by comprising the following components in percentage by weight: c: 0.07 percent to 0.12 percent; mn: 0.40% -0.70%; si: 0.40% -0.70%; mo: 0.40% -0.65%; cr: 1.20% -1.50%; s is more than 0 and less than or equal to 0.010 percent; p is more than 0 and less than or equal to 0.010 percent; ni is more than 0 and less than or equal to 0.20 percent; cu is more than 0 and less than or equal to 0.20 percent; al is more than 0 and less than or equal to 0.050 percent; v is more than 0 and less than or equal to 0.050 percent; the balance being Fe and other unavoidable impurities.
2. The argon arc welding wire for heat-resistant steel of a gasification furnace as claimed in claim 1, which is characterized by comprising the following components in percentage by weight: c: 0.09%; mn: 0.70 percent; si: 0.50 percent; mo: 0.60 percent; cr: 1.25 percent; 0.008 percent of S; 0.010 percent of P; 0.15 percent of Ni; 0.15 percent of Cu; 0.040 percent of Al; v, 0.035%; the balance being Fe and other unavoidable impurities.
3. The argon arc welding wire for heat-resistant steel of a gasification furnace as claimed in claim 1, which is characterized by comprising the following components in percentage by weight: c: 0.08 percent; mn: 0.50 percent; si: 0.65 percent; mo: 0.45 percent; cr: 1.45 percent; 0.006 percent of S; 0.009% of P; 0.025 percent of Ni; 0.05 percent of Cu; 0.0056% of Al; v, 0.0037 percent; the balance being Fe and other unavoidable impurities.
4. The argon arc welding wire for heat-resistant steel of a gasification furnace as claimed in claim 1, which is characterized by comprising the following components in percentage by weight: c: 0.10 percent; mn: 0.60 percent; si: 0.59 percent; mo: 0.42 percent; cr: 1.33 percent; s: 0.006%; p: 0.0081%; ni: 0.052 percent; cu: 0.086%; al: 0.006%; v: 0.004%; the balance being Fe and other unavoidable impurities.
5. The argon arc welding wire for heat-resistant steel of a gasification furnace as claimed in claim 1, which is characterized by comprising the following components in percentage by weight: c: 0.10 percent; mn: 0.55 percent; si: 0.50 percent; mo: 0.50 percent; cr: 1.22 percent; s: 0.006%; p: 0.010%; ni: 0.10 percent; cu: 0.086%; al: 0.006%; v: 0.02 percent; the balance being Fe and other unavoidable impurities.
6. The method for preparing the heat-resistant steel argon arc welding wire for the gasification furnace as claimed in any one of claims 1 to 5, which is characterized by comprising the following steps:
(a) preparing a wire rod, and roughly drawing the wire rod;
(b) annealing the wire rod treated in the step (a) to remove an oxide layer on the surface of the wire rod;
(c) finely drawing the wire rod processed in the step (b);
(d) and (c) carrying out surface copper plating, shredding and coding on the wire rod subjected to the fine drawing in the step (c) to obtain the argon arc welding wire.
7. The method for preparing the heat-resistant steel argon arc welding wire for the gasification furnace as claimed in claim 6, wherein the annealing treatment process in the step (b) comprises the following steps:
a temperature rising stage: heating to 620 +/-15 ℃ at the heating rate of 100-150 ℃/h, and preserving heat for 5-8 h;
a first cooling stage: cooling to below 500 ℃ along with the furnace at a cooling speed of 25-30 ℃/h;
and a second cooling stage: opening a furnace cover and quickly cooling to below 150 ℃; and (4) discharging.
8. The method for preparing the heat-resistant steel argon arc welding wire according to claim 7, characterized in thatIn the following steps: in the temperature raising stage and the first cooling stage, at a temperature of 3.2-6m3Nitrogen with a purity of 99.99% was introduced at a rate of/h.
9. The method for preparing the argon arc welding wire of the heat-resistant steel of the gasification furnace as claimed in claim 6, wherein the fine drawing process in the step (c) comprises the steps of coating boron on the surface of the wire rod by adopting boron liquid, drying at 100 ℃ and 120 ℃, matching with drawing powder, and drawing for 3-8 times; the content of borax in the boron liquid is 350-550g/L, and the temperature of the boron liquid is 60-80 ℃.
10. The method for preparing the argon arc welding wire for heat-resistant steel of the gasification furnace as claimed in claim 6, wherein the copper plating solution used in the copper plating process of the step (d) is 30-45g/L copper sulfate solution, and the copper plating speed is 2.0-5.0 m/s.
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| CN202011419183.2A CN112548397B (en) | 2020-12-07 | 2020-12-07 | Heat-resistant steel argon arc welding wire for gasification furnace and preparation method thereof |
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