CN113042928A - Preparation method of low-alloy steel pipe - Google Patents
Preparation method of low-alloy steel pipe Download PDFInfo
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- CN113042928A CN113042928A CN202110437062.9A CN202110437062A CN113042928A CN 113042928 A CN113042928 A CN 113042928A CN 202110437062 A CN202110437062 A CN 202110437062A CN 113042928 A CN113042928 A CN 113042928A
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
- B23K31/027—Making tubes with soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3066—Fe as the principal constituent with Ni as next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
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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
- B23K35/406—Filled tubular wire or rods
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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
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
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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
- B23K9/00—Arc welding or cutting
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P10/25—Process efficiency
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Abstract
The invention discloses a preparation method of a low-alloy steel pipe, which adopts a metal flux-cored wire as a raw material, wherein the wire consists of the following components, by mass, 0.72% of ferrosilicon, 1.3% of manganese, 7.2-9% of nickel, 4.2-5.6% of chromium, 1.3% of molybdenum, 0.85% of ferrovanadium, 0.03-0.08% of boron, 3% of ferrotitanium, 0.5% of aluminum, 0.08-0.12% of zirconium, 1% of rare earth and the balance of iron, and the sum of the mass percentages of the components is 100%; the invention uses metal flux-cored wire as raw material to prepare low alloy steel pipe and traditional steel pipe, which has the following advantages: the production efficiency is high, the pipe fitting formability is good, excessive equipment is not needed in the steel pipe preparation process, and the cost is low; meanwhile, the metal flux-cored wire for additive manufacturing can also be used for additive manufacturing of similar structural parts in the fields of national defense, energy, petroleum, chemical engineering, aerospace and bioengineering.
Description
Technical Field
The invention belongs to the technical field of wire-electric arc additive manufacturing, and particularly relates to a preparation method of a low-alloy steel pipe.
Background
The low alloy steel is widely applied to the fields of national defense, energy, petroleum, chemical engineering, space navigation, bioengineering and the like due to the good comprehensive properties of strength, toughness, weldability and the like. Especially, low alloy pipelines have wider application in important departments of national economy such as petroleum, chemical engineering, energy, municipal construction and the like, and play a role in conveying petroleum and natural gas and in important tasks such as inflammable, explosive, toxic and corrosive acid and alkali media and the like. Therefore, ensuring the safe operation and development of the pipeline industry is a big matter which is closely related to the national civilization, and the pipeline industry is very important at present at home and abroad.
Steel pipes are classified into seamless steel pipes and welded pipes according to the processing method. Seamless steel pipes are obtained by a piercing method and a high-speed extrusion method. The perforation method is to perforate by a perforator, roll the milk by a roller at the same time, and finally, size, mangle, smooth and form by a mandrel mill; the high speed extrusion process is direct extrusion in an extruder. The welded pipe is made up by rolling plate into pipe shape, then using resistance welding or automatic submerged arc welding to make forming, and for thick-wall large-caliber pipe it also can be made up by using steel ingot through the processes of forging and rolling. According to the pipeline manufacturing process, the process is complicated, the equipment requirement is high, and the manufacturing cost is high when the pipeline is manufactured.
Wire-arc additive manufacturing (WAAM) uses consumable electrode gas shielded welding, tungsten argon arc welding or plasma welding as a heat source, melts metal wires on a pre-planned path, accumulates layer by layer to form a metal structural member, and then can meet the use requirement through a small amount of machining or without subsequent machining. Therefore, the metal type flux-cored wire for manufacturing the low-alloy steel pipe in an additive mode is developed, and has great significance for preparing pipelines.
Disclosure of Invention
The invention aims to provide a preparation method of a low-alloy steel pipe, and the prepared steel pipe has excellent tensile property.
The technical scheme adopted by the invention is as follows: a preparation method of a low alloy steel pipe comprises the following specific operation steps:
step 1, respectively weighing 0.72 percent of ferrosilicon powder, 1.3 percent of manganese powder, 7.2 to 9 percent of nickel powder, 4.2 to 5.6 percent of chromium powder, 1.3 percent of molybdenum powder, 0.85 percent of ferrovanadium powder, 0.03 to 0.08 percent of boron powder, 3 percent of ferrotitanium powder, 0.5 percent of aluminum powder, 0.08 to 0.12 percent of zirconium powder, 1 percent of rare earth and the balance of iron powder according to the mass percent, wherein the sum of the mass percent of the components is 100 percent;
step 2, heating the alloy powder weighed in the step 1 in an inert gas atmosphere and preserving heat to obtain flux-cored powder;
step 3, filling the flux-cored powder obtained in the step 2 into a U-shaped groove of a low-carbon steel strip, preparing a welding wire with the diameter of 2.50mm after a closed forming roller, and finally preparing a metal flux-cored wire with the diameter of 1.2mm by a step-by-step reducing method;
and 4, loading the prepared metal flux-cored wire into a full-automatic welding robot, planning a welding path, determining the layer height, compiling a program, inputting the program into a welding machine, operating a welding machine command, performing additive manufacturing by adopting MAG welding as a heat source and adopting a mode of forming a pipe fitting by spiral rising to obtain the low-alloy steel pipe.
The present invention is also characterized in that,
in step 2, the inert atmosphere is argon.
In the step 2, the heating temperature is 200-300 ℃, and the heat preservation time is 2-3 h.
The technological parameters of MAG welding in the step 4 are as follows: the welding speed is 0.21m/min to 0.25 m/min; each layer of welding gun is lifted by 4-6 mm, and the protective gas is 90% Ar + 10% CO2。
The metal type welding wire of the invention has the following chemical component design basis:
the welding wire has the component design idea that a Cr-Ni-Mo alloy system is adopted, the content of C element in the welding wire is reduced, and alloy elements such as Cr, Ni, Mo, Mn, Ti, Nb, B and the like are added on the basis of low carbon to reduce crack sensitivity index, ensure strength and improve low-temperature toughness. The addition of Cr, Mo and Mn elements can improve the strength of weld metal through solid solution strengthening, delay the transformation temperature of -body structure, promote the formation of needle-shaped body, refine weld metal structure and improve the low-temperature impact toughness of weld metal. Wherein Mn is , the austenite transformation region is moved to a lower temperature, so that the eutectoid reaction is carried out at a lower carbon concentration and temperature, and the transformation of the eutectoid reaction to polygonal ferrite is inhibited at a higher temperature. Meanwhile, Cr has a certain effect on improving the strength, so that the steel can generate a passivation film of ferrochromium oxide firmly combined with a matrix tissue in an oxidizing medium, and a proper amount of chromium element can improve the toughness of weld metal; mo can improve the strength and hardness of steel, refine crystal grains, prevent tempering brittleness and overheating tendency, improve high-temperature strength, creep strength and endurance strength, delay transformation of pro-eutectoid ferrite to be beneficial to forming a bainite structure, and greatly improve the strength of deposited metal by adding a small amount of Mo. The addition of Ni can improve the impact toughness, especially the low-temperature impact toughness, of the weld metal. Nickel is an element with an infinitely enlarged austenite region, and can greatly reduce the transformation temperature of 's in the welding cooling process, thereby inhibiting the formation of massive pro-eutectoid ferrite, facilitating the formation of acicular ferrite and having a lower phaseThe transformation temperature also ensures uniform and fine precipitation of acicular ferrite, so nickel is an element that promotes the austenite content and improves the toughness of a formed article. The addition of Ti element can further refine the weld structure, and TiO and TiN formed by Ti and O, N are used as needle body nucleation particles to promote the formation of needle body in body structure crystal grains. Si in the welding wire is used as a main deoxidizing element, and the welding process performance can be improved by controlling the contents of Mn and Si. Al can form Al in the welding process2O3Needle-like body made of Al2O3The inclusions are taken as a core for multidimensional nucleation and radial growth, and the acicular ferrite is increased and then reduced along with the increase of the Al content, so that the impact toughness of the welding line is ensured. An appropriate amount of Zr will combine with oxygen to form ZrO of high density and fine distribution2The method can provide a large number of nucleation points for the acicular ferrite, form inclusion distribution beneficial to the transformation of the acicular ferrite in a small atmosphere, improve the impact toughness, and simultaneously inhibit the growth of austenite grains through the pinning effect of the fine zirconium-containing oxides and nitrides in the thermal cycle process to improve the impact toughness. The rare earth elements are added to play roles of modification and purification.
The invention has the beneficial effects that:
1. the metal flux-cored wire is used as a raw material for preparing the steel pipe, has short preparation period and high production efficiency, can realize continuous production, and can be used for additive manufacturing of low-alloy steel pipes.
2. The invention provides a method for preparing a low-alloy steel pipe based on an additive manufacturing technology by taking MAG welding as a heat source and a metal flux-cored wire as a raw material; the low alloy steel pipe is manufactured by additive manufacturing, so that the efficiency is high, the required equipment is less, and the production cost is low; the additive manufacturing process has the advantages of less splashing, stable electric arc, attractive weld forming and basically no collapse phenomenon; the low-alloy steel pipe manufactured by using the metal flux-cored wire in an additive mode based on MAG welding has excellent mechanical properties (tensile strength is 576 MPa).
Detailed Description
The present invention will be described in detail with reference to specific examples.
A metal flux-cored wire comprises the following components in percentage by mass: 0.72 percent of ferrosilicon, 1.3 percent of manganese, 7.2 to 9 percent of nickel, 4.2 to 5.6 percent of chromium, 1.3 percent of molybdenum, 0.85 percent of ferrovanadium, 0.03 to 0.08 percent of boron, 3 percent of ferrotitanium, 0.5 percent of aluminum, 0.08 to 0.12 percent of zirconium, 1 percent of rare earth and the balance of iron, wherein the sum of the mass percentages of the components is 100 percent.
The invention relates to a method for preparing a low-alloy steel pipe by taking a metal flux-cored wire as a raw material, which comprises the following steps:
step 1, respectively weighing 0.72% of ferrosilicon powder, 1.3% of manganese powder, 7.2-9% of nickel powder, 4.2-5.6% of chromium powder, 1.3% of molybdenum powder, 0.85% of ferrovanadium powder, 0.03-0.08% of boron powder, 3% of ferrotitanium powder, 0.5% of aluminum powder, 0.08-0.12% of zirconium powder, 1% of rare earth and the balance of iron powder according to the mass percentage, wherein the sum of the mass percentages of the components is 100%.
And 2, uniformly mixing the components obtained in the step 1, placing the mixture in a tubular furnace, continuously introducing argon, and keeping the temperature for 2-3 hours at 200-300 ℃.
And 3, placing a low-carbon steel strip (with the components shown in table 1) with the width of 7mm and the thickness of 0.3mm on a strip placing machine of a welding wire forming machine, rolling the low-carbon steel strip into a U-shaped groove through a pressing groove of the forming machine, placing the flux-cored powder obtained in the step 2 into the U-shaped groove, controlling the filling rate of the flux-cored powder to be 20-25 wt%, rolling and closing the U-shaped groove by using the forming machine, wiping the U-shaped groove with acetone or absolute ethyl alcohol, drawing the groove till the diameter is 1.2mm, wiping oil stains on the welding wire with cotton cloth dipped with acetone or absolute ethyl alcohol, straightening the welding wire by using a wire drawing machine, coiling the welding wire into a disc, and sealing and packaging the disc to finish the preparation of the metal flux.
And 4, loading the prepared metal flux-cored wire into a full-automatic welding robot, planning a welding path, determining the layer height, compiling a program, inputting the program into a welding machine, operating a welding machine command, and performing additive manufacturing by adopting MAG welding as a heat source to obtain the low-alloy steel pipe, wherein the specific parameters of the welding process are as follows: the welding speed is 0.21-0.25 m/min; lifting each layer of welding gun by 4-6 mm; the protective gas is 90% Ar + 10% CO2。
Example 1
Step 1: 0.72 percent of ferrosilicon powder, 1.3 percent of manganese powder, 7.2 percent of nickel powder, 4.2 percent of chromium powder, 1.3 percent of molybdenum powder, 0.85 percent of ferrovanadium powder, 0.03 percent of boron powder, 3 percent of ferrotitanium powder, 0.5 percent of aluminum powder, 0.08 percent of zirconium powder, 1 percent of rare earth and the balance of iron powder are weighed according to the mass percentage, and the sum of the mass percentages of the components is 100 percent.
Step 2: and (3) uniformly mixing all the raw materials weighed in the step (1), placing the mixture in a tube furnace, and keeping the temperature for 2 hours at 200 ℃ under the condition of continuously introducing argon.
And 3, placing a low-carbon steel strip (with the components shown in table 1) with the width of 7mm and the thickness of 0.3mm on a strip placing machine of a welding wire forming machine, rolling the low-carbon steel strip into a U-shaped groove through a pressing groove of the forming machine, placing the flux-cored powder obtained in the step 2 into the U-shaped groove, controlling the filling rate of the flux-cored powder to be 20-25 wt%, rolling and closing the U-shaped groove by using the forming machine, wiping the U-shaped groove with acetone or absolute ethyl alcohol, drawing the groove till the diameter is 1.2mm, wiping oil stains on the welding wire with cotton cloth dipped with acetone or absolute ethyl alcohol, straightening the welding wire by using a wire drawing machine, coiling the welding wire into a disc, and sealing and packaging the disc to finish the preparation of the metal flux.
And 4, loading the prepared metal flux-cored wire into a full-automatic welding robot, planning a welding path, determining the layer height, compiling a program, inputting the program into a welding machine, operating a welding machine command, and performing additive manufacturing by adopting MAG welding as a heat source to obtain the low-alloy steel pipe, wherein the specific parameters of the welding process are as follows: the welding speed is 0.25 m/min; lifting each layer of welding guns by 4 mm; the protective gas is 90% Ar + 10% CO2。
The tensile strength of the low alloy steel pipe prepared by the method is 516.4 Mpa.
Example 2
Step 1: 0.72 percent of ferrosilicon powder, 1.3 percent of manganese powder, 8 percent of nickel powder, 5 percent of chromium powder, 1.3 percent of molybdenum powder, 0.85 percent of ferrovanadium powder, 0.05 percent of boron powder, 3 percent of ferrotitanium powder, 0.5 percent of aluminum powder, 0.1 percent of zirconium powder, 1 percent of rare earth and the balance of iron powder are weighed according to the mass percent, and the sum of the mass percent of the components is 100 percent.
Step 2: and (3) uniformly mixing all the raw materials weighed in the step (1), placing the mixture in a tube furnace, and keeping the temperature for 3 hours at 230 ℃ under the condition of continuously introducing argon.
And 3, placing a low-carbon steel strip (with the components shown in table 1) with the width of 7mm and the thickness of 0.3mm on a strip placing machine of a welding wire forming machine, rolling the low-carbon steel strip into a U-shaped groove through a pressing groove of the forming machine, placing the flux-cored powder obtained in the step 2 into the U-shaped groove, controlling the filling rate of the flux-cored powder to be 20-25 wt%, rolling and closing the U-shaped groove by using the forming machine, wiping the U-shaped groove with acetone or absolute ethyl alcohol, drawing the groove till the diameter is 1.2mm, wiping oil stains on the welding wire with cotton cloth dipped with acetone or absolute ethyl alcohol, straightening the welding wire by using a wire drawing machine, coiling the welding wire into a disc, and sealing and packaging the disc to finish the preparation of the metal flux.
And 4, loading the prepared metal flux-cored wire into a full-automatic welding robot, planning a welding path, determining the layer height, compiling a program, inputting the program into a welding machine, operating a welding machine command, and performing additive manufacturing by adopting MAG welding as a heat source to obtain the low-alloy steel pipe, wherein the specific parameters of the welding process are as follows: the welding speed is 0.23 m/min; lifting each layer of welding gun by 5 mm; the shielding gas was 90% Ar + 10% CO 2.
The tensile strength of the low alloy steel pipe prepared by the method is 576 Mpa.
Example 3
Step 1: 0.72 percent of ferrosilicon powder, 1.3 percent of manganese powder, 9 percent of nickel powder, 5.6 percent of chromium powder, 1.3 percent of molybdenum powder, 0.85 percent of ferrovanadium powder, 0.08 percent of boron powder, 3 percent of ferrotitanium powder, 0.5 percent of aluminum powder, 0.12 percent of zirconium powder, 1 percent of rare earth and the balance of iron powder are weighed according to the mass percentage, and the sum of the mass percentages of the components is 100 percent.
Step 2: and (3) uniformly mixing all the raw materials weighed in the step (1), placing the mixture in a tubular furnace, and keeping the temperature for 2.5 hours at 250 ℃ under the condition of continuously introducing argon.
And 3, placing a low-carbon steel strip (with the components shown in table 1) with the width of 7mm and the thickness of 0.3mm on a strip placing machine of a welding wire forming machine, rolling the low-carbon steel strip into a U-shaped groove through a pressing groove of the forming machine, placing the flux-cored powder obtained in the step 2 into the U-shaped groove, controlling the filling rate of the flux-cored powder to be 20-25 wt%, rolling and closing the U-shaped groove by using the forming machine, wiping the U-shaped groove with acetone or absolute ethyl alcohol, drawing the groove till the diameter is 1.2mm, wiping oil stains on the welding wire with cotton cloth dipped with acetone or absolute ethyl alcohol, straightening the welding wire by using a wire drawing machine, coiling the welding wire into a disc, and sealing and packaging the disc to finish the preparation of the metal flux.
And 4, loading the prepared metal flux-cored wire into a full-automatic welding robot, planning a welding path, determining the layer height, compiling a program, inputting the program into a welding machine, operating a welding machine command, and performing additive manufacturing by adopting MAG welding as a heat source to obtain the low-alloy steel pipe, wherein the specific parameters of the welding process are as follows: the welding speed is 0.21 m/min; lifting each layer of welding guns by 6 mm; the protective gas is 90% Ar + 10% CO2。
The tensile strength of the low alloy steel pipe prepared by the method is 562.4 MPa.
TABLE 1 chemical composition (% by mass) of low carbon steel strip used in examples 1 to 3
| C | Mn | S | P | Fe |
| 0.021 | 0.15 | 0.008 | 0.009 | Balance of |
Compared with a solid welding wire, the flux-cored welding wire has the advantages that alloy elements of the flux-cored welding wire are transferred into a welding seam in the welding process through a flux core in a steel sheet, so that the content of alloy components is convenient to adjust, and the solid welding wire needs to be smelted again when the alloy components are adjusted once; in addition, in the drawing process of the solid welding wire, the drawability of some steel ingots is poor, and the solid welding wire is not easy to be drawn into the required welding wire.
The invention adopts MAG welding as the heat source for preparing the low alloy steel pipe and CO2Compared with gas shielded welding, MAG welding has stable electric arc, stable molten drop transition, less welding spatter and good welding seam formability; compared with TIG welding, MAG welding adopts the welding wire as the electrode, the welding wire and current density are large, the welding wire melting efficiency is high, the welding deformation is small, the productivity is high, and the welding wire is suitable for automatic production.
Based on MAG welding, the invention uses metal flux-cored wire as raw material to prepare low alloy steel pipe, and has the following advantages: the production efficiency is high, the pipe fitting formability is good, excessive equipment is not needed in the steel pipe preparation process, and the cost is low; the splashing is small in the welding process, and the molten drop transition is stable. The low alloy steel pipe prepared by the patent example of the invention has the tensile strength of 516.4-576 Mpa.
Claims (4)
1. The preparation method of the low alloy steel pipe is characterized by comprising the following specific operation steps:
step 1, respectively weighing 0.72 percent of ferrosilicon powder, 1.3 percent of manganese powder, 7.2 to 9 percent of nickel powder, 4.2 to 5.6 percent of chromium powder, 1.3 percent of molybdenum powder, 0.85 percent of ferrovanadium powder, 0.03 to 0.08 percent of boron powder, 3 percent of ferrotitanium powder, 0.5 percent of aluminum powder, 0.08 to 0.12 percent of zirconium powder, 1 percent of rare earth and the balance of iron powder according to the mass percent, wherein the sum of the mass percent of the components is 100 percent;
step 2, heating the alloy powder weighed in the step 1 in an inert gas atmosphere and preserving heat to obtain flux-cored powder;
step 3, filling the flux-cored powder obtained in the step 2 into a U-shaped groove of a low-carbon steel strip, preparing a welding wire with the diameter of 2.50mm after a closed forming roller, and finally preparing a metal flux-cored wire with the diameter of 1.2mm by a step-by-step reducing method;
and 4, loading the prepared metal flux-cored wire into a full-automatic welding robot, planning a welding path, determining the layer height, compiling a program, inputting the program into a welding machine, operating a welding machine command, performing additive manufacturing by adopting MAG welding as a heat source and adopting a mode of forming a pipe fitting by spiral rising to obtain the low-alloy steel pipe.
2. The method of claim 1, wherein the inert gas atmosphere in step 2 is argon.
3. The method for preparing the low alloy steel pipe according to claim 1, wherein the heating temperature in the step 2 is 200-300 ℃, and the holding time is 2-3 h.
4. The method for preparing a low alloy steel pipe according to claim 1, wherein the MAG welding in step 4 has the following process parameters: the welding speed is 0.21m/min to 0.25 m/min; each layer of welding gun is lifted by 4-6 mm, and the protective gas is 90% Ar + 10% CO2。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110437062.9A CN113042928B (en) | 2021-04-22 | 2021-04-22 | Preparation method of low-alloy steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110437062.9A CN113042928B (en) | 2021-04-22 | 2021-04-22 | Preparation method of low-alloy steel pipe |
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| CN113042928A true CN113042928A (en) | 2021-06-29 |
| CN113042928B CN113042928B (en) | 2023-01-10 |
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| CN116690128A (en) * | 2023-08-09 | 2023-09-05 | 成都先进金属材料产业技术研究院股份有限公司 | Low-alloy high-strength steel-high-temperature alloy bimetal composite pipe and preparation method thereof |
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