Production method of ER2209 austenite ferrite duplex stainless steel welding wire

Abstract

The invention relates to the technical field of metal processing, and discloses a production method of an ER2209 austenite ferrite duplex stainless steel welding wire, the ER2209 austenite ferrite duplex stainless steel welding wire comprises an adopted vacuum induction melting furnace and a liquid storage tank, the outer side of the vacuum induction melting furnace is provided with a protective shell, one side of the liquid storage tank is fixedly connected with a conveying pump, and the other side of the liquid storage tank is fixedly connected with a vacuum pump. A cooling assembly is arranged in the protective shell. The preparation method comprises the following steps that S1, raw materials are prepared and smelted; s2, cooling the vacuum induction melting furnace; s3, forging is conducted; s4, hot rolling and solution treatment; s5, acid pickling and surface treatment; s6, cold drawing and intermediate annealing; s7, surface copper plating and finish drawing; and S8, winding and packaging. In the acid pickling process of the wire rod, the oxidation degree of the wire rod is detected, meanwhile, the concentration of the acid pickling solution is adjusted according to the actual situation, and the situation that the surface of the wire rod is excessively corroded or is not thoroughly cleaned due to the fact that the concentration of the acid pickling solution is improper is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of metal processing, in particular to a production method of ER2209 austenitic-ferritic duplex stainless steel welding wire. Background Art

[0002] Metalworking, abbreviated as metalworking, refers to the production activities of humans processing materials with metallic properties composed of metal elements or mainly composed of metal elements. It is a process technology for processing metal materials into objects, parts, and components. The welding wire is used as filler metal or as a conductive metal wire welding material. In gas welding and tungsten inert gas arc welding, the welding wire is used as filler metal. In submerged arc welding, electroslag welding and other metal metal arc welding, the welding wire is both filler metal and conductive electrode. The surface of the welding wire is not coated with anti-oxidation flux. The ER2209 austenitic ferritic duplex stainless steel welding wire is a filler material specially designed for welding duplex stainless steel. Its chemical composition matches that of the base material. The deposited metal is composed of austenite and ferrite, and has high strength, good toughness and excellent corrosion resistance.

[0003] At present, in the production process of ER2209 austenitic-ferritic duplex stainless steel welding wire, the concentration ratio of the pickling solution used in some traditional methods may not be accurately adjusted according to the specific material and surface oxidation degree of the welding wire. If the concentration of acid in the pickling solution is too low, it will not be able to fully react chemically with the hot-rolled oxide scale, and it will be difficult to completely remove the oxide scale, so that some oxide scale will still remain on the surface of the welding wire. These residual oxide scales will not only affect the appearance of the welding wire, but will also reduce the quality of the weld in the subsequent welding process. At the same time, if the concentration of the pickling solution is too high, it may cause excessive corrosion to the welding wire matrix and destroy the microstructure of the welding wire surface, thereby affecting the mechanical properties and corrosion resistance of the welding wire. Summary of the Invention

[0004] The purpose of the present invention is to provide a production method for ER2209 austenitic-ferritic duplex stainless steel welding wire to solve the problem that during the production process of the welding wire, the concentration of the pickling solution cannot match the degree of oxidation on the surface of the welding wire, resulting in reduced welding wire production quality.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for producing ER2209 austenitic-ferritic duplex stainless steel welding wire, comprising a vacuum induction melting furnace and a liquid storage tank, wherein a protective shell is provided on the outside of the vacuum induction melting furnace, a delivery pump is fixedly connected to one side of the liquid storage tank, and a cooling assembly is provided inside the protective shell, comprising the following steps:

[0006] S1. Raw material preparation and smelting: Accurately weigh the raw materials according to the composition requirements and melt them in a vacuum induction melting furnace;

[0007] S2. Cooling down the vacuum induction melting furnace: After the vacuum induction melting furnace completes the melting operation, the cooling component is used to continuously flow the coolant inside the liquid storage tank to absorb and dissipate the heat stored in the vacuum induction melting furnace;

[0008] S3, forging: the molten steel is passed through a forging machine to forge the ingot into a billet;

[0009] S4, hot rolling and solution treatment: the billet is heated, and then hot rolled into wire rods in multiple passes through a high-speed wire mill, and then solution treated, and rapidly cooled after holding by water quenching;

[0010] S5. Pickling and surface treatment: Use mixed acid pickling to remove hot-rolled oxide scale, and improve surface finish through electrolytic polishing;

[0011] S6, cold drawing and intermediate annealing: the wire rod is drawn to the target diameter through multiple passes, and bright annealing treatment is inserted in the drawing process;

[0012] S7, surface copper plating and fine drawing: copper layer is electroplated on the surface of welding wire, and the copper-plated welding wire is finely drawn by precision wire drawing machine;

[0013] S8. Winding and packaging: Wind the welding wire layer onto the wire reel using an automatic winding machine for constant tension control to prevent deformation.

[0014] Preferably, in said S1, the raw materials need to be cut and crushed, and at the same time, they need to be pre-treated by cleaning, rust removal and degreasing, and the raw materials need to be accurately weighed according to the component requirements.

[0015] Preferably, in said S1, it is necessary to analyze the composition of the raw materials and the composition during the smelting process by a composition analyzer, and in said S3, it is necessary to control the forging temperature and deformation during forging.

[0016] Preferably, in S4, the blank needs to be heated to 1250-1300° C., and during the solution treatment, the temperature is monitored and recorded by a temperature detector.

[0017] Preferably, in S5, HNO3 and HF pickling are used to remove the hot-rolled oxide scale. Before the pickling operation, the wire rod needs to be tested for oxidation degree, and then the concentration and ratio of the pickling solution are adjusted. After the pickling is completed, it needs to be cleaned and dried. After the surface treatment is completed, the surface finish needs to be tested by a surface finish tester.

[0018] Preferably, in said S6, when performing the annealing treatment, the annealing temperature is controlled at 950-1050°C, and in said S7, when the copper layer is electroplated on the surface of the welding wire, the thickness thereof is 1-3 μm.

[0019] Preferably, the welding wire reel that has been wound in S8 needs to be vacuum-sealed and moisture-proofed, and constant tension control needs to be maintained during the winding process.

[0020] Preferably, the cooling assembly includes a first cooling pipe connected to the liquid outlet of the delivery pump, a second cooling pipe is arranged inside the protective shell, the bottom of the second cooling pipe is connected to a connecting pipe, the bottom of the connecting pipe is connected to a third cooling pipe, and the bottom of the third cooling pipe is connected to a fourth cooling pipe.

[0021] Preferably, one end of the first cooling pipe is connected to a hose, both ends of the hose are provided with a first connector, one end of the fourth cooling pipe is connected to a second connector, the end of the second connector away from the fourth cooling pipe is connected to a circulation pipe, and the end of the circulation pipe away from the fourth cooling pipe is connected to the liquid storage tank.

[0022] Preferably, a positioning plate is provided on the top of the protective shell, a positioning bolt is provided inside the positioning plate, the outer side of the positioning bolt is connected to the inner thread of the protective shell, a placement groove is provided inside the protective shell, a semiconductor refrigeration plate is provided on one side of the liquid storage tank, a heat conduction plate is provided on one side of the semiconductor refrigeration plate, and a heat sink is fixedly connected to the side of the heat conduction plate away from the semiconductor refrigeration plate.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] In S1 of the present invention, the raw materials are accurately weighed according to the component requirements to ensure the accuracy and consistency of the welding wire composition, thereby ensuring the stable performance of the welding wire. At the same time, the welding is carried out through a vacuum induction melting furnace to effectively isolate the air, reduce the mixing of impurities, and improve the purity and quality of the welding wire. By setting a cooling component, the cooling component can be used to continuously flow the coolant in the liquid storage tank, quickly absorb and dissipate the heat stored in the vacuum induction melting furnace, shorten the cooling time, and improve production efficiency. At the same time, timely and effective cooling can reduce the thermal stress of the equipment caused by high temperature and extend the service life of the equipment. By setting S3, the ingot is forged into a square billet, which can refine the grain structure and improve the strength and toughness of the welding wire. At the same time, the forging process helps to improve the internal organization of the welding wire, eliminate casting defects, and improve the overall performance of the welding wire. By setting S4, multiple hot rolling is performed through a high-speed wire rolling mill, which can accurately control the size and shape of the welding wire and improve the welding The processing accuracy of the wire is improved, and the water quenching method is used for rapid cooling after holding for solution treatment, which can optimize the phase composition of the welding wire, improve the corrosion resistance and mechanical properties of the welding wire, and the wire rod is drawn to the target diameter through multiple passes, so the size of the welding wire can be accurately controlled to meet different usage requirements. By drawing and inserting bright annealing treatment during the drawing process, the toughness of the welding wire can be restored and the influence of cold work hardening on the performance of the welding wire can be reduced. In addition, the copper layer is electroplated on the surface of the welding wire, which can significantly improve the conductivity of the welding wire and is suitable for welding occasions requiring good conductivity. The copper-plated welding wire is fine-drawn by a precision wire drawing machine to ensure the dimensional tolerance of the welding wire and improve the accuracy and stability of welding. The automatic winding machine is used for constant tension control to prevent the welding wire from deforming during the winding process and ensure the straightness and roundness of the welding wire. The welding wire layer is wound onto the wire reel for packaging, which is convenient for storage and transportation of the welding wire and improves production efficiency and logistics efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A flow chart of a preferred embodiment of the method for producing ER2209 austenitic-ferritic duplex stainless steel welding wire provided by the present invention;

[0026] Figure 2 A schematic structural diagram of a preferred embodiment of the method for producing ER2209 austenitic-ferritic duplex stainless steel welding wire provided by the present invention;

[0027] Figure 3 A schematic diagram of the cooling assembly structure provided by the present invention;

[0028] Figure 4 A schematic diagram of the connection between the second cooling pipe and the protective shell structure provided by the present invention;

[0029] Figure 5 This is a schematic diagram of the connection between the liquid storage tank and the heat sink structure provided by the present invention.

[0030] In the figure: 1. Vacuum induction melting furnace; 2. Liquid storage tank; 3. Protective shell; 4. Delivery pump; 5. Cooling assembly; 51. First cooling pipe; 52. Second cooling pipe; 53. Connecting pipe; 54. Third cooling pipe; 55. Fourth cooling pipe; 6. Hose; 7. First connector; 8. Second connector; 9. Circulation pipe; 10. Positioning plate; 11. Positioning bolt; 12. Placement slot; 13. Semiconductor refrigeration plate; 14. Heat conduction plate; 15. Heat sink. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-5 As shown, the production method of ER2209 austenitic-ferritic duplex stainless steel welding wire includes a vacuum induction melting furnace 1 and a liquid storage tank 2. A protective shell 3 is provided on the outside of the vacuum induction melting furnace 1. A delivery pump 4 is fixedly connected to one side of the liquid storage tank 2. A cooling assembly 5 is provided inside the protective shell 3. The method includes the following steps:

[0033] S1. Raw material preparation and smelting: Raw materials are accurately weighed according to the composition requirements and smelted in a vacuum induction melting furnace. Accurately weighing raw materials according to the composition requirements can ensure that the chemical composition of the welding wire meets the design standards, laying the foundation for the welding wire to ultimately have excellent performance. Accurate weighing can avoid unstable performance caused by composition deviation.

[0034] S2. Cooling the vacuum induction melting furnace: After the vacuum induction melting furnace 1 completes the melting operation, the cooling component 5 causes the two coolants in the liquid storage tank to continuously flow, thereby absorbing and dissipating the heat stored in the vacuum induction melting furnace 1. The cooling component 5 causes the coolant in the liquid storage tank to continuously flow, which can effectively absorb and dissipate the heat stored in the vacuum induction melting furnace 1, thereby extending its service life.

[0035] S3. Forging: The molten steel is forged into billets through a forging machine. By forging the molten steel into billets, the internal structure of the ingot can be improved and the pores and looseness in the ingot can be eliminated by controlling the forging temperature and deformation.

[0036] S4, hot rolling and solution treatment: the billet is heated, and then hot rolled into wire rods in multiple passes through a high-speed wire mill, and then solution treated, and rapidly cooled after holding by water quenching;

[0037] S5. Pickling and surface treatment: Use mixed acid pickling to remove hot-rolled oxide scale, and improve surface finish through electrolytic polishing; before pickling, test the degree of oxidation of the wire rod, and then adjust the concentration and ratio of the pickling solution to make the pickling solution more effective in removing hot-rolled oxide scale, while avoiding excessive corrosion or incomplete cleaning of the wire rod surface due to improper pickling solution concentration.

[0038] S6, cold drawing and intermediate annealing: the wire rod is drawn to the target diameter through multiple passes, and bright annealing treatment is inserted in the drawing process;

[0039] S7, surface copper plating and fine drawing: copper layer is electroplated on the surface of welding wire, and the copper-plated welding wire is finely drawn by precision wire drawing machine;

[0040] S8. Winding and packaging: Wind the welding wire layer onto the wire reel using an automatic winding machine for constant tension control to prevent deformation.

[0041] refer to Figure 2 and Figure 3As shown, in S1, the raw materials need to be cut and crushed, and at the same time, they need to be cleaned, derusted and degreased. The raw materials need to be accurately weighed according to the component requirements. Cutting and crushing the raw materials is conducive to more complete melting of the raw materials in the vacuum induction melting furnace and improving the melting efficiency. Cleaning, derusting and degreasing pretreatment can remove impurities on the surface of the raw materials and prevent these impurities from entering the welding wire during the melting process and affecting the quality and performance of the welding wire. In S1, the composition of the raw materials and the melting process needs to be analyzed by a component analyzer. The analyzer analyzes the composition of raw materials and the smelting process, and can grasp the composition changes in real time to further improve the quality of the welding wire. In S3, during forging, it is necessary to control the forging temperature and deformation. In S4, the billet needs to be heated to 1250-1300℃. Heating the billet to 1250-1300℃ can make the billet have good plasticity, which is convenient for multiple hot rolling into wire rods through high-speed wire rolling mills. At the same time, the hot rolling process can further refine the grains and improve the structure and performance of the wire rods. At the same time, during the solution treatment, the hot rolling process can further refine the grains and improve the structure and performance of the wire rods. The temperature is monitored and recorded by the degree detector. In S5, HNO3 and HF pickling are used to remove the hot-rolled oxide scale. At the same time, before the pickling operation, the wire rod needs to be tested for oxidation degree, and then the concentration and ratio of the pickling solution are adjusted. After the pickling is completed, it needs to be cleaned and dried. At the same time, after the surface treatment is completed, the surface finish needs to be tested by the surface finish detector. In S6, during the annealing treatment, the annealing temperature is controlled at 950-1050℃, and bright annealing treatment is inserted in the drawing process. The ignition temperature is controlled at 950-1050℃, which can eliminate the work hardening caused by the drawing process, restore the plasticity of the welding wire, facilitate subsequent drawing, and improve the structure and performance of the welding wire. In S7, when the copper layer is electroplated on the surface of the welding wire, its thickness is 1-3μm. The copper layer is electroplated on the surface of the welding wire with a thickness of 1-3μm. The copper layer can play a role in rust prevention and conductivity, thereby improving the storage stability and welding performance of the welding wire. The wire reel that has been wound in S8 needs to be vacuum sealed and moisture-proofed, and constant tension control needs to be maintained during the winding process.

[0042] refer to Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, the cooling assembly 5 includes a first cooling pipe 51 connected to the liquid outlet of the delivery pump 4, a second cooling pipe 52 is provided inside the protective shell 3, the bottom of the second cooling pipe 52 is connected to a connecting pipe 53, the bottom of the connecting pipe 53 is connected to a third cooling pipe 54, the bottom of the third cooling pipe 54 is connected to a fourth cooling pipe 55, one end of the first cooling pipe 51 is connected to a hose 6, both ends of the hose 6 are provided with a first connector 7, one end of the fourth cooling pipe 55 is connected to a second connector 8, and the second connector 8 is away from the fourth cooling pipe 5 5 is connected to a circulation pipe 9, and the end of the circulation pipe 9 away from the fourth cooling pipe 55 is connected to the liquid storage tank 2. A positioning plate 10 is provided on the top of the protective shell 3, and a positioning bolt 11 is provided inside the positioning plate 10. The outer side of the positioning bolt 11 is connected to the inner thread of the protective shell 3. A placement groove 12 is provided inside the protective shell 3. A semiconductor refrigeration plate 13 is provided on one side of the liquid storage tank 2, and a heat conducting plate 14 is provided on one side of the semiconductor refrigeration plate 13. A heat dissipation plate 15 is fixedly connected to the side of the heat conducting plate 14 away from the semiconductor refrigeration plate 13.

[0043] Working principle: First, the raw materials are pretreated and accurately weighed, and then put into the vacuum induction melting furnace 1 for melting operation, and the composition analysis is carried out during the melting process to ensure the accuracy of the chemical composition of the molten steel. The vacuum induction melting furnace 1 is then cooled by the cooling component 5 to extend the service life of the vacuum induction melting furnace. The staff then heats the billet and hot-rolls it into wire rod, and then performs solid solution treatment on it to optimize the structure and performance of the wire rod. The staff adjusts the pickling solution according to the oxidation degree of the wire rod, removes the oxide scale and performs surface treatment and inspection to ensure the surface quality. Through multiple drawing and intermediate annealing, the diameter of the welding wire is accurately controlled and the performance is improved, further improving the surface quality and performance of the welding wire. Finally, constant tension is used to control the winding and vacuum seal the moisture-proof treatment to ensure the shape and storage quality of the welding wire.

[0044] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for producing ER2209 austenitic-ferritic duplex stainless steel welding wire, comprising a vacuum induction melting furnace and a liquid storage tank, wherein a protective shell is provided on the outside of the vacuum induction melting furnace, a delivery pump is fixedly connected to one side of the liquid storage tank, and a cooling assembly is provided inside the protective shell, characterized in that: The following steps are involved: S1. Raw material preparation and smelting: Accurately weigh the raw materials according to the composition requirements and melt them in a vacuum induction melting furnace; S2. Cooling down the vacuum induction melting furnace: After the vacuum induction melting furnace completes the melting operation, the cooling component is used to continuously flow the coolant inside the liquid storage tank to absorb and dissipate the heat stored in the vacuum induction melting furnace; S3, forging: the molten steel is passed through a forging machine to forge the ingot into a billet; S4, hot rolling and solution treatment: the billet is heated, and then hot rolled into wire rods in multiple passes through a high-speed wire mill, and then solution treated, and rapidly cooled after holding by water quenching; S5. Pickling and surface treatment: Use mixed acid pickling to remove hot-rolled oxide scale, and improve surface finish through electrolytic polishing; S6, cold drawing and intermediate annealing: the wire rod is drawn to the target diameter through multiple passes, and bright annealing treatment is inserted in the drawing process; S7, surface copper plating and fine drawing: copper layer is electroplated on the surface of welding wire, and the copper-plated welding wire is finely drawn by precision wire drawing machine; S8. Winding and packaging: Wind the welding wire layer onto the wire reel using an automatic winding machine for constant tension control to prevent deformation.

2. The method for producing the ER2209 austenitic-ferritic duplex stainless steel welding wire according to claim 1, wherein: In S1, the raw materials need to be cut and crushed, and at the same time, they need to be pre-treated by cleaning, rust removal and degreasing, and the raw materials need to be accurately weighed according to the component requirements.

3. The method for producing the ER2209 austenitic-ferritic duplex stainless steel welding wire according to claim 1, wherein: In the above S1, it is necessary to analyze the components of the raw materials and the smelting process by a component analyzer. In the above S3, during forging, it is necessary to control the forging temperature and deformation amount.

4. The method for producing the ER2209 austenitic-ferritic duplex stainless steel welding wire according to claim 1, wherein: In the above-mentioned S4, the blank needs to be heated to 1250-1300° C., and during the solution treatment, the temperature is monitored and recorded by a temperature detector.

5. The method for producing the ER2209 austenitic-ferritic duplex stainless steel welding wire according to claim 1, wherein: In S5, HNO3 and HF pickling are used to remove the hot-rolled oxide scale. Before the pickling operation, the wire rod needs to be tested for oxidation degree, and then the concentration and ratio of the pickling solution are adjusted. After the pickling is completed, it needs to be cleaned and dried. After the surface treatment is completed, the surface finish needs to be tested by a surface finish tester.

6. The method for producing the ER2209 austenitic-ferritic duplex stainless steel welding wire according to claim 1, wherein: In the step S6, the annealing temperature is controlled at 950-1050°C. In the step S7, the copper layer is electroplated on the surface of the welding wire to a thickness of 1-3 μm.

7. The method for producing the ER2209 austenitic-ferritic duplex stainless steel welding wire according to claim 1, wherein: The welding wire reel wound in S8 needs to be vacuum sealed and moisture-proofed, and constant tension control needs to be maintained during the winding process.

8. The method for producing the ER2209 austenitic-ferritic duplex stainless steel welding wire according to claim 1, wherein: The cooling assembly includes a first cooling pipe connected to the liquid outlet of the delivery pump, a second cooling pipe is arranged inside the protective shell, the bottom of the second cooling pipe is connected to a connecting pipe, the bottom of the connecting pipe is connected to a third cooling pipe, and the bottom of the third cooling pipe is connected to a fourth cooling pipe.

9. The method for producing the ER2209 austenitic-ferritic duplex stainless steel welding wire according to claim 8, wherein: One end of the first cooling pipe is connected to a hose, both ends of the hose are provided with a first connector, one end of the fourth cooling pipe is connected to a second connector, the end of the second connector away from the fourth cooling pipe is connected to a circulation pipe, and the end of the circulation pipe away from the fourth cooling pipe is connected to the liquid storage tank.

10. The method for producing the ER2209 austenitic-ferritic duplex stainless steel welding wire according to claim 9, wherein: A positioning plate is provided on the top of the protective shell, a positioning bolt is provided inside the positioning plate, the outer side of the positioning bolt is connected to the inner thread of the protective shell, a placement groove is provided inside the protective shell, a semiconductor refrigeration plate is provided on one side of the liquid storage tank, a heat conduction plate is provided on one side of the semiconductor refrigeration plate, and a heat dissipation plate is fixedly connected to the side of the heat conduction plate away from the semiconductor refrigeration plate.

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