Fused salt hot corrosion resistant cladding welding wire for high-parameter garbage incinerator

Abstract

The invention belongs to the technical field of welding materials, and particularly relates to a fused salt hot corrosion resistant cladding welding wire for a high-parameter garbage incinerator. Comprising the following components in percentage by mass: less than or equal to 0.015% of C, 25-27% of Cr, 15-17% of Mo, 2.5-3% of Nb, 0.5-1% of Ta, 2-3% of Co, 0.5-1.5% of Cu, 0.2-0.5% of Si, 0.1-0.2% of RE, 0.1-0.15% of N, less than or equal to 0.3% of W, less than or equal to 3% of Fe, less than or equal to 0.02% of P, less than or equal to 0.02% of S and the balance of Ni and inevitable impurities. The cladding welding wire material is very suitable for the working condition of a high-parameter waste incineration boiler, good in welding manufacturability, good in corrosion resistance in a chloride medium, especially excellent in corrosion resistance under the crossed corrosion environment of sulfur / chlorine mixed molten salt with the temperature higher than 540 DEG C, gas phase HCl / SO2 and the like, free of magnetism, high in corrosion resistance and good in corrosion resistance. The heat conductivity is good, the material cost is relatively reasonable, and long-acting protection against serious corrosion of the heating surface of the high-parameter waste incineration boiler is achieved.

Description

Technical Field

[0001] This invention belongs to the field of welding materials technology, and in particular relates to cladding welding wire resistant to molten salt hot corrosion for high-parameter waste incinerators. Background Technology

[0002] Waste incinerators are the most widely used environmentally friendly energy equipment for the comprehensive utilization of solid waste, volume reduction of municipal solid waste, and harmless treatment. During operation, the heating surfaces of the boiler water-cooled walls suffer severe high-temperature chloride corrosion, leading to severe thinning of the tube walls and even tube rupture. The boiler water-cooled walls face extremely harsh environments, including high temperatures, fly ash particle erosion, gaseous corrosive media, and molten salt corrosion, especially the deposition of sulfur / chlorine mixed molten salt corrosion on the heating surface tube walls.

[0003] Studies have shown that the corrosion rate doubles for every 25°C increase in temperature, indicating exceptionally severe high-temperature corrosion. Furthermore, under these conditions, the sulfur / chlorine mixed molten salt on the pipe wall reacts to form a low-melting-point eutectic mixture, which is in a molten state. On one hand, the pipe wall metal undergoes chemical corrosion in the combined environment of the sulfur / chlorine mixed molten salt and chlorine in the gaseous phase. On the other hand, the sulfur / chlorine mixed molten salt, at higher temperatures, is in a molten state, forming an electrolyte and creating a galvanic cell (corrosion cell) on the metal surface, causing simultaneous electrochemical corrosion of the pipe wall metal. Therefore, pipe wall corrosion is a combined chemical-electrochemical process. Because these two corrosion mechanisms occur simultaneously, the pipe wall suffers from extremely harsh environments, making it impossible for the boiler to operate safely and stably. Therefore, the corrosion resistance of the boiler water-cooled wall must be able to withstand these harsh environments. In recent years, Inconel 625 has been widely used in engineering for medium- and low-parameter waste incineration boilers, combined with pulsed MIG and MAG welding technologies to form a corrosion-resistant weld overlay. However, for high-parameter boilers with temperatures of 540-600℃, the corrosion rate of the above materials is several times or even more than ten times higher than that of medium and low-parameter boilers, which seriously restricts the development of high-parameter waste incinerators.

[0004] Therefore, the protection of water-cooled walls in high-parameter waste incineration boilers urgently requires a suitable alloy material resistant to molten salt hot corrosion. This is to address the problem of water-cooled walls in high-parameter waste incineration boilers being prone to corrosion, thinning, and tube rupture under extremely harsh environments of high temperature and sulfur / chlorine mixed molten salt. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a cladding wire for high-parameter waste incinerators that is resistant to molten salt thermal corrosion, the purpose of which is to solve the problems mentioned in the background art.

[0006] In a first aspect, the present invention provides a cladding wire for high-parameter waste incinerators that resists molten salt thermal corrosion, comprising the following components by mass percentage: C≤0.015%, Cr 25~27%, Mo 15~17%, Nb 2.5~3%, Ta 0.5~1%, Co 2~3%, Cu 0.5~1.5%, Si 0.2~0.5%, RE 0.1~0.2%, N 0.1~0.15%, W≤0.3%, Fe≤3%, P≤0.02%, S≤0.02%, with the remainder being Ni and unavoidable impurities.

[0007] The cladding welding wire material of this invention is very suitable for high-parameter waste incineration boilers. It has good welding processability and excellent corrosion resistance in chloride media, especially in cross-corrosion environments such as sulfur / chlorine mixed molten salt and gaseous HCl / SO2 at >540℃. It is non-magnetic, has good thermal conductivity, and the material cost is relatively reasonable, thus achieving long-term protection against severe corrosion of the heating surfaces of high-parameter waste incineration boilers in my country.

[0008] Furthermore, the total amount of Cr and Mo does not exceed 42%.

[0009] Furthermore, RE includes Ce, La, or Y.

[0010] Furthermore, the diameter of the cladding wire is Φ1.2mm.

[0011] Secondly, the present invention provides a method for preparing a cladding wire resistant to molten salt thermal corrosion for high-parameter waste incinerators, comprising the following steps: The components are mixed according to the mass percentage of the cladding wire to obtain a mixed powder. The mixed powder is then melted, cast into an ingot, and then hot-forged to form an alloy rod. The alloy rod is then hot-rolled into a wire rod, which is then subjected to normalizing and high-temperature tempering heat treatment, pickled, and then drawn in multiple passes using a pressure die method.

[0012] Furthermore, the multi-pass drawing process using the pressure die method specifically involves: firstly, the wire rod is drawn and reduced in diameter through 8 passes of coarse drawing to obtain alloy wire; then, the alloy wire is drawn and reduced in diameter through 7 passes of fine drawing to obtain cladding welding wire.

[0013] Furthermore, the wire rod is first rough-drawn and reduced in diameter through 8 passes to obtain alloy wire; then, the alloy wire is fine-drawn and reduced in diameter through 7 passes to obtain cladding welding wire. Specifically, the Φ5.5mm wire rod is first rough-drawn in 8 passes to reduce the diameter to Φ2.0mm. After the rough drawing is completed, it is immediately put into the furnace for furnace cooling and intermediate annealing within 30 minutes to obtain Φ2.0mm alloy wire. After annealing, the Φ2.0mm alloy wire is fine-drawn in 7 passes to Φ1.2mm. Among them, the first 4 passes use 0.12~0.15mm / pass drawing, and after every 2 passes, forced air cooling stress relief annealing is performed immediately; the last 3 passes use 0.08~0.10mm / pass fine drawing, and finally drawn into Φ1.2mm cladding welding wire.

[0014] Furthermore, after obtaining the cladding wire, it is then subjected to bright annealing and surface treatment.

[0015] Furthermore, the alloy rod has a diameter of Φ45mm; the wire rod has a diameter of Φ5.5mm; the alloy wire has a diameter of Φ2.0mm; and the cladding wire has a diameter of Φ1.2mm.

[0016] Thirdly, the present invention provides the application of cladding welding wire resistant to molten salt thermal corrosion for high-parameter waste incinerators in waste incinerators, wherein the cladding welding wire is used as an alloy material for the cladding layer of the water-cooled wall of the waste incinerator.

[0017] Furthermore, the cladding wire is resistant to sulfur and / or chlorine molten salt corrosion.

[0018] The present invention has the following beneficial effects: (1) The cladding wire for high-parameter waste incinerators is suitable for various welding processes such as CMT (Cold Metal Transfer Welding), MIG (Metal Inert Gas Welding), and MAG (Metal Inert Gas Welding), and can be used for manual or automated welding. No preheating is required during welding, and it can be directly deposited on the workpiece surface. It has good welding processability, beautiful weld bead formation, and excellent corrosion resistance. In particular, it has excellent corrosion resistance in cross-corrosion environments such as sulfur / chlorine mixed molten salt and gaseous HCl / SO2 at >540℃. The average corrosion resistance rate of the cladding layer of the welding wire reduces the thickness to about 1 / 2 of that of existing welding wires.

[0019] (2) The cladding wire for high-parameter waste incinerators, designed to withstand the harsh corrosive environment of high-temperature and high-pressure waste incinerators, exhibits excellent corrosion resistance in both oxidizing and reducing corrosive media. Due to its unique chemical composition design and scientifically balanced ratio, the alloy possesses comprehensive corrosion resistance in high-temperature sulfur / chlorine mixed molten salt environments, ensuring excellent resistance to uniform corrosion, as well as outstanding resistance to pitting and crevice corrosion, and significant resistance to intergranular corrosion and stress corrosion. Simultaneously, it maintains stable microstructure, good high-temperature performance and weldability, and possesses matching thermal conductivity, coefficient of thermal expansion, and other physicochemical properties, ensuring the basic performance requirements of the cladding layer and the heat exchange efficiency of the water-cooled wall. Attached Figure Description

[0020] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures: Figure 1 The appearance of the cladding layer formed after the cladding wire prepared in Example 1 of this invention is clad onto the water-cooled wall tube bank of a waste incinerator is described.

[0021] Figure 2 The metallographic structure of the cladding layer formed by the cladding wire in Embodiment 1 of the present invention is shown in the figure. Scale bar: 50 μm.

[0022] Figure 3 The image shows the cross-sectional morphology of the weld overlay formed by the cladding wire in Embodiment 1 of the present invention after corrosion by sulfur / chlorine mixed molten salt at 600°C for 120 hours. Scale bar: 20 μm. Detailed Implementation

[0023] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0025] This invention provides a cladding wire for high-parameter waste incinerators that resists molten salt thermal corrosion, comprising the following components by mass percentage: C≤0.015%, Cr 25~27%, Mo 15~17%, Nb 2.5~3%, Ta 0.5~1%, Co 2~3%, Cu 0.5~1.5%, Si 0.2~0.5%, RE 0.1~0.2%, N 0.1~0.15%, W≤0.3%, Fe≤3%, P≤0.02%, S≤0.02%, with the remainder being Ni and unavoidable impurities.

[0026] In some embodiments, the total amount of Cr and Mo does not exceed 42%.

[0027] In some embodiments, RE includes Ce, La, or Y.

[0028] In some embodiments, the diameter of the cladding wire is Φ1.2mm.

[0029] In some embodiments, the present invention provides a method for preparing a cladding wire resistant to molten salt thermal corrosion for high-parameter waste incinerators, comprising the following steps: The components are mixed according to the mass percentage of the cladding wire to obtain a mixed powder. The mixed powder is then melted, cast into an ingot, and then hot-forged to form an alloy rod. The alloy rod is then hot-rolled into a wire rod, which is then subjected to normalizing and high-temperature tempering heat treatment, pickled, and then drawn in multiple passes using a pressure die method.

[0030] In some embodiments, hot forging is performed to forge an alloy bar; then the alloy bar is hot-rolled into a wire rod, and the wire rod is subjected to normalizing and high-temperature tempering heat treatment, specifically: Hot forging is performed at 1100~1180℃ to form an alloy bar with a diameter of Φ45mm; the Φ45mm alloy bar is then hot-rolled at 1080~1120℃ into a wire rod with a diameter of Φ5.5mm; the rolled Φ5.5mm wire rod is then subjected to normalizing at 1150~1200℃ and high-temperature tempering at 850~900℃.

[0031] In some embodiments, the multi-pass drawing process using the pressure die method specifically involves: firstly, the wire rod is drawn and reduced in diameter through 8 passes of coarse drawing to obtain alloy wire; then, the alloy wire is drawn and reduced in diameter through 7 passes of fine drawing to obtain cladding welding wire.

[0032] In some embodiments, the wire rod is first drawn and reduced in diameter in 8 passes by coarse drawing to obtain alloy wire; then the alloy wire is drawn and reduced in diameter in 7 passes by fine drawing to obtain cladding welding wire. Specifically, the Φ5.5mm wire rod is first coarsely drawn in 8 passes to reduce the diameter to Φ2.0mm. After the coarse drawing is completed, it is immediately put into the furnace for furnace cooling and intermediate annealing within 30 minutes to obtain Φ2.0mm alloy wire. After annealing, the Φ2.0mm alloy wire is finely drawn in 7 passes to Φ1.2mm. The first 4 passes use 0.12~0.15mm / pass drawing, and forced air cooling stress relief annealing is performed immediately after every 2 passes. The last 3 passes use 0.08~0.10mm / pass fine drawing to finally draw Φ1.2mm cladding welding wire.

[0033] In some embodiments, after obtaining the cladding wire, bright annealing and surface treatment are performed.

[0034] In some embodiments, the diameter of the alloy rod is Φ45mm; the diameter of the wire rod is Φ5.5mm; the diameter of the alloy wire is Φ2.0mm; and the diameter of the cladding wire is Φ1.2mm.

[0035] In some embodiments, the present invention provides the application of cladding welding wire resistant to molten salt thermal corrosion for high-parameter waste incinerators in waste incinerators, wherein the cladding welding wire is used as a raw material for making cold walls of waste incinerators.

[0036] In some embodiments, the cladding wire is resistant to sulfur and / or chlorine molten salt corrosion.

[0037] Example 1: Preparation of cladding welding wire resistant to molten salt hot corrosion for high-parameter waste incinerators The components were mixed according to the mass percentage of the cladding wire to obtain a mixed powder. The components, by mass percentage, are: C 0.01%, Cr 25.3%, Mo 16.5%, Nb 2.7%, Ta 0.6%, Co 2.5%, Cu 0.9%, Si 0.5%, RE 0.2% (0.15% Ce and 0.05% La), N 0.1%, W 0.2%, Fe 1.8%, P 0.016%, S 0.018%, the remainder being Ni and unavoidable impurities; the mixed powder is smelted in a melting furnace and cast into ingots; then, it is hot-forged at 1100℃ to form alloy bars with a diameter of Φ45mm; the Φ45mm alloy bars are then hot-rolled at 1080℃ into wire rods with a diameter of Φ5.5mm; the rolled Φ5.5mm wire rods are subjected to normalizing at 1150℃ and high-temperature tempering at 850℃, and then pickled; then, multiple drawing processes are performed on a wire drawing unit using a pressure die method, first performing 8 rough drawing processes on the Φ5.5mm wire rods to reduce the diameter. After rough drawing to Φ2.0mm, the wire is immediately placed in the furnace within 30 minutes and furnace-cooled at 780℃ for 1 hour to obtain Φ2.0mm alloy wire. After annealing, the Φ2.0mm alloy wire is finely drawn to Φ1.2mm in 7 passes. The first 4 passes use 0.12~0.15mm / pass drawing, and after every 2 passes, it is immediately subjected to forced air cooling stress relief annealing at 720℃ for 40 minutes. The last 3 passes use 0.08~0.10mm / pass fine drawing to finally produce Φ1.2mm cladding welding wire. Finally, the Φ1.2mm cladding welding wire is bright annealed at 700℃ and surface treated.

[0038] In the rough drawing process, the wire is immediately annealed in the furnace within 30 minutes to prevent microcracks or deformation caused by stress relaxation at room temperature. This timely release of the processing stress generated during rough drawing ensures the stability of subsequent fine drawing. During fine drawing, the diameter is larger in the early stage, and a larger deformation is used to improve efficiency. Stress is released quickly every two annealing passes to prevent stress accumulation that could lead to brittle fracture. Forced air cooling is used to prevent grain coarsening. In the later stage, the diameter is smaller, and a smaller deformation is used to reduce stress generation. Brittle fracture can be avoided without additional annealing.

[0039] The appearance of the cladding layer formed after the welding wire is fused onto the water-cooled wall tube bank of the waste incinerator is as follows: Figure 1 As shown, the results indicate that the weld bead pattern of the cladding layer is clear, uniform and continuous, the weld bead formation is beautiful, and the surface is flat and dense. This shows that the cladding process is stable and the forming quality is excellent, which can provide corrosion and wear protection for the water-cooled wall tubes of the waste incinerator under harsh working conditions.

[0040] Metallographic structure of the cladding layer formed by the cladding wire, such as Figure 2As shown, the results indicate that the cross-sectional metallographic structure of the cladding layer formed by the cladding wire is a fine dendrite growing along the heat flow direction. The overall structure is dense, with small and uniformly distributed grains, and no obvious pores, cracks or segregation. This microstructure is an important guarantee for the excellent mechanical properties and corrosion resistance of the cladding layer, which shows that the cladding process is stable and the wire composition is well matched.

[0041] The cross-sectional morphology of the weld overlay formed by the cladding wire after corrosion by sulfur / chlorine mixed molten salt at 600℃ for 120h is as follows: Figure 3 As shown, the results indicate that a continuous oxide layer, mainly composed of Cr2O3 and containing a small amount of NiO, was formed on the surface and interface of the weld overlay. The continuous oxide layer was tightly bonded to the substrate, with no obvious peeling, cracking or deep corrosion. This indicates that the weld overlay can effectively hinder molten salt penetration by generating a stable and dense protective passivation film, and has excellent corrosion resistance under the sulfur / chlorine mixed molten salt corrosion conditions of 600℃ and 120h.

[0042] Example 2: Preparation of cladding welding wire resistant to molten salt hot corrosion for high-parameter waste incinerators The components were mixed according to the mass percentage of the cladding wire to obtain a mixed powder. The components, by mass percentage, are: C 0.015%, Cr 25.7%, Mo 16.0%, Nb 2.5%, Ta 0.9%, Co 2.1%, Cu 1.2%, Si 0.35%, RE 0.1% (0.02% La and 0.08% Y), N 0.12%, W 0.1%, Fe 1.5%, P 0.012%, S 0.015%, the remainder being Ni and unavoidable impurities; the mixed powder is placed in a melting furnace for melting and casting into ingots; then, it is hot-forged at 1180℃ to form alloy bars with a diameter of Φ45mm; the Φ45mm alloy bars are then hot-rolled at 1120℃ into wire rods with a diameter of Φ5.5mm; the rolled Φ5.5mm wire rods are subjected to normalizing at 1200℃ and high-temperature tempering at 900℃, and the heat-treated Φ5.5mm wire rods are then pickled; then, a multi-pass drawing process is performed on a wire drawing unit using a pressure die method, first performing 8 passes of rough drawing on the Φ5.5mm wire rods to reduce the diameter. After rough drawing to Φ2.0mm, the wire is immediately placed in the furnace within 30 minutes and furnace-cooled at 820℃ for 1 hour to obtain Φ2.0mm alloy wire. After annealing, the Φ2.0mm alloy wire is finely drawn to Φ1.2mm in 7 passes. The first 4 passes use 0.12~0.15mm / pass drawing, and after every 2 passes, it is immediately subjected to forced air cooling stress relief annealing at 750℃ for 40 minutes. The last 3 passes use 0.08~0.10mm / pass fine drawing to finally produce Φ1.2mm cladding welding wire. Finally, the Φ1.2mm cladding welding wire is bright annealed at 730℃ and surface treated.

[0043] Example 3: Preparation of cladding welding wire resistant to molten salt hot corrosion for high-parameter waste incinerators The components were mixed according to the mass percentage of the cladding wire to obtain a mixed powder. The components, by mass percentage, are: C 0.008%, Cr 26.7%, Mo 15.0%, Nb 3.0%, Ta 0.5%, Co 2.8%, Cu 0.5%, Si 0.2%, RE 0.15% (0.05%Ce, 0.05%La and 0.05%Y), N 0.15%, W 0.3%, Fe 2.7%, P 0.010%, S 0.013%, the remainder being Ni and unavoidable impurities; the mixed powder is placed in a melting furnace for melting and casting into ingots; then, it is hot-forged at 1150℃ to form alloy bars with a diameter of Φ45mm; the Φ45mm alloy bars are then hot-rolled at 1100℃ into wire rods with a diameter of Φ5.5mm; the rolled Φ5.5mm wire rods are subjected to normalizing at 1180℃ and high-temperature tempering at 870℃, and the heat-treated Φ5.5mm wire rods are then pickled; then, a multi-pass drawing process is performed on a wire drawing unit using a pressure die method, first performing 8 passes of rough drawing on the Φ5.5mm wire rods to reduce the diameter. After rough drawing to Φ2.0mm, the wire is immediately placed in the furnace within 30 minutes and furnace-cooled at 800℃ for 1 hour to obtain Φ2.0mm alloy wire. After annealing, the Φ2.0mm alloy wire is finely drawn to Φ1.2mm in 7 passes. The first 4 passes use 0.12~0.15mm / pass drawing, and after every 2 passes, it is immediately subjected to forced air cooling stress relief annealing at 730℃ for 40 minutes. The last 3 passes use 0.08~0.10mm / pass fine drawing to finally produce Φ1.2mm cladding welding wire. Finally, the Φ1.2mm cladding welding wire is bright annealed at 720℃ and surface treated.

[0044] Comparative Example 1: A cladding wire, otherwise the same as in Example 1, except that: It includes the following chemical components and their weight percentages: C 0.01%, Cr 25.3%, Mo 13%, Nb 2.2%, Ta 0.6%, Co 2.5%, Cu 0.9%, Si 0.5%, RE 0.2%, N 0.1%, W 0.2%, Fe 1.8%, P 0.016%, S 0.018%, with the remainder being Ni and unavoidable impurities.

[0045] Comparative Example 2: A cladding wire, otherwise the same as in Example 1, except that: It includes the following chemical components and their weight percentages: C 0.01%, Cr 29.5%, Mo 19%, Nb 2.7%, Ta 0.6%, Co 2.5%, Cu 0.9%, Si 0.5%, RE 0.2%, N 0.1%, W 0.2%, Fe 1.8%, P 0.016%, S 0.018%, with the remainder being Ni and unavoidable impurities.

[0046] Comparative Example 3: A cladding wire, otherwise the same as in Example 1, except that it includes the following chemical components and their weight percentages: C 0.01%, Cr 25.3%, Mo 16.5%, Nb 2.7%, Ta 0.6%, Co 2.5%, Cu 0.9%, Si 0.5%, RE 0.2%, N 0.1%, W 0.7%, Fe 6.2%, P 0.016%, S 0.018%, with the remainder being Ni and unavoidable impurities.

[0047] Comparative Example 4: A cladding wire, otherwise the same as in Example 2, except that it includes the following chemical components and their weight percentages: C 0.01%, Cr 25.3%, Mo 16.5%, Nb 2.7%, Ta 0.6%, Co 0.5%, Cu 0.9%, Si 0.5%, RE 0.2%, W 0.2%, Fe 1.8%, P 0.016%, S 0.018%, with no added N, the remainder being Ni and unavoidable impurities.

[0048] Comparative Example 5: A cladding wire, otherwise the same as in Example 2, except that RE is not added to the composition.

[0049] The corrosion resistance test results of the cladding layers of Examples 1-3 and Comparative Examples 1-5 are shown in Table 1.

[0050] Table 1 Test results of cladding layer performance

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cladding welding wire resistant to molten salt thermal corrosion for high-parameter waste incinerators, characterized in that, The composition includes the following components by mass percentage: C≤0.015%, Cr 25~27%, Mo 15~17%, Nb 2.5~3%, Ta 0.5~1%, Co 2~3%, Cu 0.5~1.5%, Si 0.2~0.5%, RE 0.1~0.2%, N 0.1~0.15%, W≤0.3%, Fe≤3%, P≤0.02%, S≤0.02%, with the remainder being Ni and unavoidable impurities.

2. The cladding welding wire for high-parameter waste incinerators resistant to molten salt thermal corrosion as described in claim 1, characterized in that, The total amount of Cr and Mo does not exceed 42%.

3. The cladding welding wire for high-parameter waste incinerators resistant to molten salt thermal corrosion as described in claim 2, characterized in that, The diameter of the cladding wire is Φ1.2mm.

4. The method for preparing the cladding welding wire resistant to molten salt thermal corrosion for high-parameter waste incinerators as described in any one of claims 1-3, characterized in that, Includes the following steps: The components are mixed according to the mass percentage of the cladding wire to obtain a mixed powder. The mixed powder is then melted, cast into an ingot, and then hot-forged to form an alloy rod. The alloy rod is then hot-rolled into a wire rod, which is then subjected to normalizing and high-temperature tempering heat treatment, pickled, and then drawn in multiple passes using a pressure die method.

5. The preparation method according to claim 4, characterized in that, The multi-pass drawing process using the pressure die method is as follows: first, the wire rod is drawn and reduced in diameter through 8 passes of coarse drawing to obtain alloy wire; then, the alloy wire is drawn and reduced in diameter through 7 passes of fine drawing to obtain cladding welding wire.

6. The preparation method according to claim 5, characterized in that, First, the wire rod is drawn and reduced in diameter through 8 passes of rough drawing to obtain alloy wire. Then, the alloy wire is drawn and reduced in diameter through 7 passes of fine drawing to obtain cladding welding wire. Specifically, the Φ5.5mm wire rod is first rough drawn in 8 passes to reduce the diameter to Φ2.0mm. After the rough drawing is completed, it is immediately put into the furnace for furnace cooling and intermediate annealing within 30 minutes to obtain Φ2.0mm alloy wire. After annealing, the Φ2.0mm alloy wire is finely drawn in 7 passes to Φ1.2mm. Among them, the first 4 passes use 0.12~0.15mm / pass drawing, and after every 2 passes, forced air cooling stress relief annealing is performed immediately. The last 3 passes use 0.08~0.10mm / pass fine drawing to finally draw Φ1.2mm cladding welding wire.

7. The preparation method according to claim 4, characterized in that, After obtaining the cladding wire, it is then subjected to bright annealing and surface treatment.

8. The preparation method according to claim 4, characterized in that, The alloy rod has a diameter of Φ45mm; the wire rod has a diameter of Φ5.5mm; the alloy wire has a diameter of Φ2.0mm; and the cladding wire has a diameter of Φ1.2mm.

9. The application of the molten salt hot corrosion resistant cladding welding wire for high-parameter waste incinerators as described in any one of claims 1-3 in waste incinerators, characterized in that, The cladding wire is used as an alloy material for the cladding layer of the water-cooled wall of a waste incinerator.

10. The application as described in claim 9, characterized in that, The cladding wire is resistant to sulfur and / or chlorine molten salt corrosion.

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