High-temperature-oxidation-resistant stainless steel flux-cored wire and application thereof

Abstract

The invention relates to the technical field of flux-cored wires, and discloses a high-temperature-oxidation-resistant stainless steel flux-cored wire and application thereof. By adding the Ti element into the 409L stainless steel flux-cored wire, the 409L stainless steel flux-cored wire has good high-temperature corrosion resistance and better strength requirements. However, the Ti element is strong in activity and extremely easy to oxidize and burn, and the weight percentage of the Ti element required by weld cladding metal in the standard is very difficult to reach. In order to solve the problems, the invention provides the high-temperature-oxidation-resistant stainless steel flux-cored wire, by adjusting the components and formulas in the components of the steel strip and the flux core of the welding wire and combining the synergistic effect of Ti, Al compounds, metal reducing substances and the like in the components of the flux-cored wire, on one hand, the content of the Ti element in a welding seam is increased, and on the other hand, the high-temperature-oxidation-resistant stainless steel flux-cored wire is obtained; and on the other hand, Al is preferentially oxidized in the high-temperature welding process, so that the content of a weld cladding metal Ti element is increased, and the high-temperature oxidation resistance of the weld is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flux-cored wires, and particularly relates to a high-temperature oxidation-resistant stainless steel flux-cored wire. Background Art

[0002] The high-temperature components at the front end of the automotive exhaust system can reach a maximum temperature of 900°C, which is the part with the highest exhaust temperature and the most severe corrosion to materials. The temperature is about 600°C after the center pipe, and the temperature at the tail end outlet is between 100 - 300°C. Therefore, the material is required to have a certain high-temperature oxidation resistance. On the other hand, since the vehicle is always in a repeated operating state of starting and stopping, the material is required to have good high-temperature fatigue resistance. 409 ferritic stainless steel contains Ti element in its wire rod composition; Ti-stabilized 409 stainless steel has good high-temperature oxidation resistance and is the steel grade with the largest usage amount in the current automotive exhaust system. However, the traditional 409L ferritic stainless steel (Ti content 0.1 - 0.3%) has limited high-temperature oxidation resistance although the corrosion is inhibited by the stabilization effect of Ti. Moreover, during the welding process, titanium element is easily combined with oxygen to form TiO2 inclusions, resulting in a significant reduction in the effective titanium content in the cladding metal (loss rate > 40%), and it is difficult to form a continuous TiO2-Cr2O3 composite oxide film protective layer.

[0003] Elements such as Al are also easily combined with oxygen element to form oxides during the welding process to achieve the purpose of deoxidation. And Al oxide can react with Ti element, and the reaction formula is: 2[Ti] + (Al2O3) = 2[Al] + (Ti2O3). It can be seen from the formula that there is an equilibrium molar ratio of n([Al]) / n([Ti]). When n([Al]) / n([Ti]) is higher than the equilibrium value, the oxide exists in the form of Al2O3, otherwise Ti will be oxidized to form TiOx, reducing the utilization rate of titanium. The melting point of Al2O3 is about 2072°C, which is much higher than that of TiO x The melting point. During the high-temperature welding cladding process and the rapid cooling process, Al reacts with TiO x to reduce Ti, and the generated oxide Al2O3 preferentially precipitates into the slag system. Currently, the design of the flux-cored wire does not consider the Al / Ti ratio, resulting in problems such as insufficient deoxidation, deterioration of mechanical properties, and decline in high-temperature oxidation resistance.

[0004] Therefore, how to solve the titanium loss during the welding of high-titanium ferritic flux-cored wires, increase the titanium content in the cladding metal, enhance the high-temperature corrosion resistance of the automotive exhaust system, and how to regulate the passivation oxide film protective layer in the weld metal through elemental oxidation reactions to improve the service life of ferritic stainless steel in the automotive exhaust system are the technical problems to be solved by the present invention. Summary of the Invention

[0005] The technical problems existing in the prior art are as follows: Based on the original composition of the 409Ti ferritic stainless steel flux-cored wire for gas shielded welding, the Ti content in the wire composition is relatively low, which will reduce its corresponding high-temperature corrosion resistance. In addition, the current flux-cored wire design does not consider the Al / Ti ratio, resulting in insufficient deoxidation and many pores. The lack of addition of rare earth elements leads to coarse grains and poor mechanical properties, etc.

[0006] In view of the above problems, the present invention provides a high-temperature oxidation-resistant stainless steel flux-cored wire. Through the design of 409Ti steel strip with high Ti content, the Al and Ti ratios are adjusted in the flux-cored wire and rare earth oxides are added to control inclusions, reduce the oxidation of Ti, refine grains, and improve the weld properties at the same time.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows: The 409Ti ferritic stainless steel flux-cored wire for gas shielded welding comprises: iron skin and flux-cored powder. The thickness of the iron skin is 0.8 mm. The flux-cored powder is evenly filled and fills the cylindrical accommodating cavity formed by the iron skin. The mass filling rate of the flux-cored powder is 10-20%. The iron skin is 409Ti stainless steel strip; The 409Ti stainless steel strip, by weight percentage, comprises the following components: carbon 0.01%-0.03%; silicon 0.01%-0.05%; manganese 0.2%-0.8%; sulfur <0.03%; phosphorus <0.04%; nickel <0.06%; chromium 10%-11%; molybdenum 0.01%-0.02%; titanium 0.3%-0.5%; the balance is iron; The flux-cored powder, by weight percentage, comprises the following components: 2-12% of mixed metal oxide powder; 0.2-1% of rare earth oxide powder; 2-6% of fluoride powder; 0.5-2% of ferrozirconium alloy powder; 3-10% of ferrotitanium alloy powder; 1-5% of aluminum powder; 20-40% of ferrochrome alloy powder; 4-10% of manganese powder; 2-5% of arc stabilizing agent; the balance is iron powder. The mixed metal oxide powder is at least one of titanium oxide, potassium oxide, and aluminum oxide.

[0008] Among them, (relative molar amount of Al) / (relative molar amount of Ti) in the flux-cored wire > 0.56:1; specifically: [(mass percentage of Al powder in the powder) / (molar mass of Al)] / [((mass percentage of ferrotitanium alloy powder in the powder * mass percentage of titanium element + mass percentage of titanium in the steel strip) / (molar mass of Ti))] > 0.56:1. Compounds such as aluminum oxide (Al2O3) and titanium oxide (TiO2) will not decompose into Al and Ti elemental substances during the conventional welding process. Therefore, they are not included in the calculation when calculating the molar mass ratio.

[0009] Further, the mixed metal oxide powder includes at least one of titanium oxide, potassium oxide, and aluminum oxide.

[0010] Further, the rare earth oxide powder includes at least one of cerium oxide, yttrium oxide, and lanthanum oxide; the purity of the rare earth oxide powder is greater than 99.9%.

[0011] Further, the fluoride powder includes at least two of sodium fluoride, potassium fluoride, barium fluoride, and lithium fluoride.

[0012] Further, the zirconium in the zirconium-iron alloy powder accounts for 95-99% of the total mass of the zirconium-iron alloy, and the rest is iron.

[0013] Further, the mass percentage content of titanium in the titanium-iron alloy powder is 36-43%, and the rest is iron.

[0014] Further, the chromium in the chromium-iron alloy powder accounts for 65-72% of the total mass of the chromium-iron alloy, and the rest is iron.

[0015] The purities of the aluminum powder, manganese powder, and iron powder are all greater than 99.9%.

[0016] The arc stabilizing agent includes at least two of potassium titanate, sodium titanate, sodium potassium titanate, lithium titanate, and calcium titanate.

[0017] Preferably, the average particle size of the flux-cored powder is 100-200 mesh.

[0018] Preferably, the method for preparing the high-temperature oxidation-resistant stainless steel flux-cored wire includes the following steps: (1) Roll the 409Ti stainless steel strip into a U shape, and add the formulated amount of flux-cored powder into the U-shaped groove; (2) Close the U-shaped groove and roll it into an O-shaped steel pipe, and then successively perform rolling forming, wire drawing and reducing diameter treatment, and surface mechanical cleaning to obtain a Φ1.2mm stainless steel flux-cored wire; the filling rate of the flux-cored powder in the O-shaped steel pipe is 10-20%.

[0019] The chemical composition of the clad metal obtained after welding the ferritic stainless steel flux-cored wire, by weight percentage, includes the following components: carbon 0.01%-0.04%; silicon 0.3%-0.8%; manganese 0.2%-0.8%; sulfur <0.1%; phosphorus <0.03%; nickel 0.01-0.1%; chromium 11%-12%; molybdenum <0.03%; titanium 0.5%-0.8%; oxygen 0.01-0.03%; nitrogen 0.1-0.2%; copper 0.01-0.03%; Al 0.020-0.05%; the balance is iron.

[0020] Among them, this range ensures that Al is sufficient to be preferentially oxidized to inhibit the oxidation of Ti. However, excessive Al needs to be avoided to prevent an increase in brittle Al2O3 inclusions, and at the same time, excessive enrichment of Al should be prevented to avoid a decrease in the fluidity of the molten pool or coarsening of inclusions.

[0021] After the high-temperature oxidation-resistant stainless steel welding wire obtained by the present invention is welded, the content of Ti element in the weld cladding metal formed reaches 10*C - 1.5%, which can effectively improve the high-temperature corrosion resistance of the automotive exhaust system. The present invention has the following beneficial effects: (1) By adjusting the chemical composition of the 409L steel strip, the present invention ensures the content of Ti element in the steel strip composition and provides a high-temperature oxidation-resistant high-titanium (Ti: 0.3 - 0.5%) stainless steel strip 409Ti.

[0022] (2) Through the high-temperature oxidation-resistant stainless steel flux-cored wire, according to research, elements such as Al can react with Ti element during welding to produce complex Al2O3 - TiOx inclusion oxides. By adjusting the addition amount of each element in the flux powder, the n([Al]) / n([Ti]) in the initial material is higher than the equilibrium value of 0.56:1, and the oxide exists in the form of Al2O3, thereby reducing the oxidation rate of Ti in the weld cladding metal and forming stable compounds such as TiN and TiC to achieve the effect of improving the high-temperature oxidation resistance of the automotive exhaust system.

[0023] (3) By increasing the addition ratio of elements such as Al and Ti in the flux powder composition, on the one hand, it can assist in deoxidation, reduce the oxygen content in the weld, and achieve the purpose of reducing pores; on the other hand, it can promote the formation of Ti element in the weld through metallurgical reactions during welding, increase the content of Ti element in the cladding metal, and add rare earth oxide powder, which acts together with Ti element to refine grains, purify the weld structure, and improve the mechanical properties of the weld joint. Specific embodiments

[0024] The present invention will be described in detail below in conjunction with embodiments. However, it should be understood that the following embodiments are only illustrative examples of the implementation mode of the present invention and do not limit the scope of the present invention.

[0025] In the following embodiments of the present invention, the purity of the rare earth oxide powder used is greater than 99.9%; the mass percentage content of Ti element in the ferrotitanium metal powder is 40%, and the balance is iron; the mass percentage content of Zr element in the ferrozirconium alloy powder is 98%, and the balance is iron; the mass percentage content of Cr element in the ferrochrome alloy is 70%, and the balance is iron; the purities of the aluminum powder, manganese powder, chromium powder, and iron powder used are all 99.9%.

[0026] Example 1: A high-temperature oxidation-resistant stainless steel flux-cored wire with a diameter of Φ = 1.2 mm, which is composed of iron skin and flux-cored powder. The thickness of the iron skin is 0.8 mm. The flux-cored powder is evenly filled and fills the cylindrical accommodating cavity formed by the iron skin. The filling rate of the flux-cored powder is 12%. The iron skin is a 409Ti stainless steel strip; The 409Ti stainless steel strip, by weight percentage, includes the following components: carbon 0.02%; silicon 0.03%; manganese 0.2%; sulfur 0.008%; phosphorus 0.012%; nickel 0.02%; chromium 10%; molybdenum 0.01%; titanium 0.3%; the balance is iron.

[0027] The flux-cored powder, by weight percentage, has the following composition: mixed metal oxide powder 2%; rare earth oxide powder 0.2%; fluoride powder 2%; ferrozirconium alloy powder 0.5%; ferrotitanium alloy powder 5%; aluminum powder 1%; ferrochrome alloy powder 25%; manganese powder 4.5%; arc stabilizing agent 2%; iron powder as the balance; among which the mixed metal oxide powder is composed of titanium oxide and aluminum oxide in a mass ratio of 1:1; the rare earth oxide powder is cerium oxide; the fluoride powder includes sodium fluoride and barium fluoride in a mass ratio of 5:1; the arc stabilizing agent includes potassium titanate and sodium potassium titanate in a mass ratio of 5:2. The ratio of n([Al]) / n([Ti]) in the initial weld material is 0.771:1. (1 / 26.98):[(5*40% + 0.3) / 47.87]≈0.771:1.

[0028] A high-temperature oxidation-resistant stainless steel flux-cored wire, and its preparation method comprises the following steps: (1) Roll a 409Ti stainless steel strip with a specification of 1.0*14 mm into a U shape, and add the formulated amount of flux-cored powder into the U-shaped groove. The average particle size of the flux-cored powder is 100 mesh; (2) Close the U-shaped groove and roll it into an O-shaped steel pipe. The filling rate of the flux-cored powder in the O-shaped steel pipe is 12%; (3) The O-shaped steel pipe is rolled through 6 groups of 24 pass roll dies, drawn through 1 pass of a sizing die, and rolled through 5 groups of 50 pass rolls to make a stainless steel flux-cored wire with a diameter of Φ2.0 mm; (4) The obtained wire is further drawn through 6 drawing processes to make a stainless steel flux-cored wire with a diameter of Φ1.2 mm.

[0029] Example 2: A high-temperature oxidation-resistant stainless steel flux-cored wire with a diameter of Φ = 1.2 mm, which is composed of iron skin and flux-cored powder. The thickness of the iron skin is 0.8 mm. The flux-cored powder is evenly filled and fills the cylindrical accommodating cavity formed by the iron skin. The filling rate of the flux-cored powder is 16%. The iron skin is a 409Ti stainless steel strip; The 409Ti stainless steel strip, by weight percentage, comprises the following components: carbon 0.015%; silicon 0.02%; manganese 0.4%; sulfur 0.006%; phosphorus 0.010%; nickel 0.05%; chromium 10.5%; molybdenum 0.02%; titanium 0.4%; and the balance is iron.

[0030] The flux-cored powder, by weight percentage, has the following composition: mixed oxide powder 5%; rare earth oxide powder 0.5%; fluoride powder 4%; ferrozirconium alloy powder 1%; ferrotitanium alloy powder 7%; aluminum powder 1.2%; ferrochrome alloy powder 24%; manganese powder 4%; arc stabilizing agent 3%; and the balance is iron powder; the ratio of n([Al]) / n([Ti]) in the initial weld is 0.67:1. (1.2 / 26.98):[(7*40% + 0.4) / 47.87]≈0.67:1.

[0031] Among them, the mixed metal oxide powder is composed of titanium oxide and aluminum oxide in a mass ratio of 1:4; the rare earth oxide powder is lanthanum oxide; the fluoride powder includes sodium fluoride and lithium fluoride in a mass ratio of 3:2; The arc stabilizing agent includes potassium titanate, sodium potassium titanate, and sodium titanate in a mass ratio of 4:1:2.

[0032] A high-temperature oxidation-resistant stainless steel flux-cored wire, and its preparation method comprises the following steps: (1) Roll the 409Ti stainless steel strip into a U shape, and add the formulated amount of flux-cored powder into the U-shaped groove. The average particle size of the flux-cored powder is 100 mesh; (2) Close the U-shaped groove and roll it into an O-shaped steel pipe. The filling rate of the flux-cored powder in the O-shaped steel pipe is 16%; (3) The O-shaped steel pipe is rolled by 6 groups of 24 pass roll dies, drawn by 1 sizing die, and rolled by 5 groups of 50 rolls to form a stainless steel flux-cored wire with a diameter of Φ2.0 mm; (4) The obtained wire is further drawn through 6 drawing processes to form a stainless steel flux-cored wire with a diameter of Φ1.2 mm.

[0033] Example 3: A high-temperature oxidation-resistant stainless steel flux-cored wire with a diameter of Φ = 1.2 mm, which is composed of an iron skin and flux-cored powder. The thickness of the iron skin is 0.8 mm. The flux-cored powder is evenly filled and fills the cylindrical accommodating cavity formed by the iron skin. The filling rate of the flux-cored powder is 18%. The iron skin is a 409Ti stainless steel strip; The 409Ti stainless steel strip, by weight percentage, comprises the following components: carbon 0.02%; silicon 0.015%; manganese 0.5%; sulfur 0.009%; phosphorus 0.01%; nickel 0.02%; chromium 11%; molybdenum 0.01%; titanium 0.4%; and the balance is iron.

[0034] The said flux-cored powder, by weight percentage, has the following composition: mixed oxide powder 10%; rare earth oxide powder 0.8%; fluoride powder 4%; ferrozirconium alloy powder 2%; ferrotitanium alloy powder 9%; aluminum powder 2%; ferrochrome alloy powder 22%; manganese powder 4%; arc stabilizing agent 2%; the balance is iron powder; the ratio of n([Al]) / n([Ti]) in the initial weld is 0.887:1. (2 / 26.98):[(9*40% + 0.4) / 47.87] = 0.887:1.

[0035] The said mixed metal oxide powder is composed of titanium oxide and aluminum oxide in a mass ratio of 3:2; the said rare earth oxide powder is cerium oxide; the said fluoride powder includes sodium fluoride and barium fluoride in a mass ratio of 6:1; the said arc stabilizing agent includes potassium titanate and sodium titanate in a mass ratio of 5:2.

[0036] A high-temperature oxidation-resistant stainless steel flux-cored wire, and its preparation method comprises the following steps: (1) Roll the 409Ti stainless steel strip into a U shape, and add the formulated amount of flux-cored powder into the U-shaped groove. The average particle size of the flux-cored powder is 140 mesh. (2) Close the U-shaped groove and roll it into an O-shaped steel pipe. The filling rate of the flux-cored powder in the O-shaped steel pipe is 18%. (3) The O-shaped steel pipe is rolled through 6 groups of 24 pass roll dies, drawn through 1 sizing die, and rolled through 5 groups of 50 rolls to make a stainless steel flux-cored wire with a diameter of Φ2.0mm. (4) The obtained wire is further drawn through 6 drawing processes to make a stainless steel flux-cored wire with a diameter of Φ1.2mm.

[0037] Example 4: A high-temperature oxidation-resistant stainless steel flux-cored wire with a diameter of Φ = 1.2mm, which is composed of iron skin and flux-cored powder. The thickness of the iron skin is 0.8mm. The flux-cored powder is evenly filled and fills the cylindrical accommodating cavity formed by the iron skin. The filling rate of the flux-cored powder is 15%. The said iron skin is a 409Ti stainless steel strip. The said 409Ti stainless steel strip, by weight percentage, includes the following components: carbon 0.01%; silicon 0.02%; manganese 0.8%; sulfur 0.005%; phosphorus 0.02%; nickel 0.04%; chromium 12%; molybdenum 0.01%; titanium 0.4%; the balance is iron.

[0038] The said flux-cored powder, by weight percentage, has the following components: mixed oxide powder 12%; rare earth oxide powder 0.4%; fluoride powder 6%; ferrozirconium alloy powder 2%; ferrotitanium alloy powder 8%; aluminum powder 1%; ferrochrome alloy powder 28%; manganese powder 8%; arc stabilizing agent 4%; iron powder as the balance; the ratio of n([Al]) / n([Ti]) in the initial weld seam is 0.493:1. [(1 / 26.98):[(8*40% + 0.4) / 47.87] = 0.493:1].

[0039] The said mixed metal oxide powder is composed of titanium oxide and aluminum oxide in a mass ratio of 4:1; the said rare earth oxide powder is cerium oxide; the said fluoride powder includes sodium fluoride and lithium fluoride in a mass ratio of 5:1; the said arc stabilizing agent includes potassium titanate and sodium potassium titanate in a mass ratio of 2:1.

[0040] A high-temperature oxidation-resistant stainless steel flux-cored wire, and its preparation method comprises the following steps: (1) Roll a 409Ti stainless steel strip into a U shape, and add the formula amount of flux-cored powder into the U-shaped groove. The average particle size of the flux-cored powder is 120 mesh; (2) Close the U-shaped groove and roll it into an O-shaped steel pipe. The filling rate of the flux-cored powder in the O-shaped steel pipe is 12%; (3) The O-shaped steel pipe is rolled through 6 groups of 24 pass roll dies, drawn through 1 sizing die, and rolled through 5 groups of 50 pass rolls to make a stainless steel flux-cored wire with a diameter of Φ2.0mm; (4) The obtained wire is further drawn through 6 drawing processes to make a stainless steel flux-cored wire with a diameter of Φ1.2mm.

[0041] Example 5: Example 5 is the same as Example 1, except that in Example 5, the weight percentage of the added ferrotitanium alloy powder is 2%. Other operations are the same as those in Example 1.

[0042] Example 6: Example 6 is the same as Example 1, except that in Example 6, the weight percentage of the added ferrotitanium alloy powder is 12%. Other operations are the same as those in Example 1.

[0043] Example 7: Example 7 is the same as Example 1, except that in Example 7, the weight percentage of the added ferrotitanium alloy powder is 15%. Other operations are the same as those in Example 1.

[0044] Example 8: Example 8 is the same as Example 1, except that in Example 8, no aluminum powder is added. Other operations are the same as those in Example 1.

[0045] Example 9: Example 9 is the same as Example 1, except that in Example 9, the weight percentage of the added aluminum powder is 0.5%. Other operations are the same as those in Example 1.

[0046] Example 10: Example 10 is the same as Example 1, except that the weight percentage of aluminum powder added in Example 10 is 8%. Other operations are the same as those in Example 1.

[0047] Example 11: Example 11 is the same as Example 1, except that all of the mixed metal oxide powder added in Example 11 is titanium oxide. Other operations are the same as those in Example 1.

[0048] Example 12: Example 12 is the same as Example 1, except that all of the mixed metal oxide powder added in Example 12 is aluminum oxide. Other operations are the same as those in Example 1.

[0049] Example 13: Example 13 is the same as Example 1, except that the steel strip used in Example 13 is 409L stainless steel, and in terms of weight percentage, it has the following components: carbon 0.02%; silicon 0.03%; manganese 0.2%; sulfur 0.008%; phosphorus 0.012%; nickel 0.02%; chromium 10%; molybdenum 0.01%; the balance is iron.

[0050] Example 14: Example 14 is the same as Example 1, except that cerium oxide is not added in Example 14, and an equal amount of iron powder is used to supplement.

[0051] For performance testing, the flux-cored wires obtained from Examples 1-14 of the present invention were respectively used to perform groove welding on 0Cr13 stainless steel, and relevant performance tests were respectively carried out on the weld cladding metals obtained. Each group of parallel experiments was tested 10 times, and the average value was taken. The specific test results are shown in Table 1. After the flux-cored wires obtained from Examples 1-14 of the present invention were welded at a current of 120-180 A, a voltage of 20-24 V, and a shielding gas of 98% Ar + 2% O2, the compositions of the weld cladding metals obtained are shown in Table 2.

[0052] Weld deposited metal, tensile strength: The test standard is GB / T 228.1-2021. Weld deposited metal, elongation at break: The test standard is GB / T 228.1-2021. Weld cladding metal, high-temperature oxidation rate: The test standard is ASTM G54-1996.

[0053] Table 1

[0054] Table 2

[0055] Inspired by the above-described ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A heat-resistant oxidation stainless steel flux-cored wire, characterized in that, The stainless steel flux-cored wire comprises a steel sheath and flux-cored powder; wherein the steel sheath is a 409Ti stainless steel strip; The 409Ti stainless steel strip, by weight percentage, comprises the following components: carbon 0.01%-0.03%; silicon 0.01%-0.05%; manganese 0.2%-0.8%; sulfur <0.03%; phosphorus <0.04%; nickel <0.06%; chromium 10%-11%; molybdenum 0.01%-0.02%; titanium 0.3%-0.5%; the balance is iron; The flux-cored powder, by weight percentage, comprises the following components: 2-12% of mixed metal oxide powder; 0.2-1% of rare earth oxide powder; 2-6% of fluoride powder; 0.5-2% of ferrozirconium alloy powder; 3-10% of ferrotitanium alloy powder; 1-5% of aluminum powder; 20-40% of ferrochrome alloy powder; 4-10% of manganese powder; 2-5% of arc stabilizing agent; the balance is iron powder; wherein the mixed metal oxide powder is at least one of titanium oxide, potassium oxide, and aluminum oxide.

2. The high-temperature oxidation-resistant stainless steel flux-cored wire according to claim 1, wherein: The rare earth oxide powder is at least one of cerium oxide, yttrium oxide, and lanthanum oxide; the purity of the rare earth oxide powder is greater than 99.9%.

3. The high-temperature oxidation-resistant stainless steel flux-cored wire according to claim 1, wherein, The fluoride powder is at least two of sodium fluoride, potassium fluoride, barium fluoride, and lithium fluoride.

4. The high-temperature oxidation-resistant stainless steel flux-cored wire according to claim 1, wherein In the ferrozirconium alloy powder, zirconium element accounts for 95-99% of the total mass of the ferrozirconium alloy, and the rest is iron; in the ferrotitanium alloy powder, titanium element accounts for 36-43% of the total mass of the ferrotitanium alloy, and the rest is iron; in the ferrochrome alloy powder, chromium element accounts for 65-72% of the total mass of the ferrochrome alloy, and the rest is iron.

5. The oxidation-resistant stainless steel flux-cored wire resistant to high temperature according to claim 1, wherein The arc stabilizing agent is at least two of potassium titanate, sodium titanate, potassium sodium titanate, lithium titanate, and calcium titanate.

6. The oxidation-resistant stainless steel flux-cored wire resistant to high temperature according to claim 1, characterized in that, In the flux-cored wire, [(mass percentage of aluminum powder in the flux powder) / (molar mass of aluminum)] / [((mass percentage of ferrotitanium alloy powder in the flux powder * mass percentage content of titanium element) + mass percentage content of titanium in the steel strip) / (molar mass of titanium)] > 0.

56.

7. The oxidation-resistant stainless steel flux-cored wire resistant to high temperature according to claim 1, wherein The preparation method of the high-temperature oxidation-resistant stainless steel flux-cored wire is as follows: (1) Roll the 409Ti stainless steel strip into a U shape, and add the flux-cored powder into the U-shaped groove; (2) Close the U-shaped groove and roll it into an O-shaped steel pipe, and then successively perform rolling forming, wire drawing and reducing diameter treatment, and surface mechanical cleaning to obtain a Φ1.2mm stainless steel flux-cored wire; the filling rate of the flux-cored powder in the O-shaped steel pipe is 10-20%.

8. Use of the oxidation-resistant stainless steel flux-cored wire capable of withstanding high temperature according to any one of claims 1-7, characterized in that: The flux-cored wire is used for groove welding of stainless steel; wherein the weld cladding metal, by weight percentage, comprises the following components: carbon 0.01%-0.04%; silicon 0.3%-0.8%; manganese 0.2%-0.8%; sulfur <0.1%; phosphorus <0.03%; nickel 0.01-0.1%; chromium 11%-12%; molybdenum <0.03%; titanium 0.5%-0.8%; oxygen 0.01-0.03%; nitrogen 0.1-0.2%; copper 0.01-0.03%; Al 0.020~0.05%; the balance is iron.

Images