High chromium cast iron surfacing welding rod and preparation method thereof

Abstract

The present invention provides a high-chromium cast iron cladding electrode and a preparation method thereof, specifically relating to the field of welding materials. The high-chromium cast iron cladding electrode comprises a welding core and a coating coated on the surface of the welding core, wherein the coating comprises the following components, and the weight percentages of each component are as follows: 85-90 parts high-carbon ferrochromium, 0.5-1 part medium-carbon ferromanganese, 1-2 parts aluminum-magnesium alloy, 1.5-2.5 parts fluorite, 0.5-1 part alkaline surfactant, 0.3-0.8 part titanium dioxide, 1-2 parts graphite, 1-2 parts ferrovanadium, 2-4 parts boron carbide, 0.5-1 part carboxymethyl cellulose, 0.3-0.8 part microcrystalline cellulose, 0.2-0.6 part lanthanum boride, and 0.2-0.6 part cerium oxide. The high chromium cast iron surfacing welding rod of the present invention is hypereutectic ultra-high chromium cast iron. During welding, the arc is stable, spatter and slag are small, and slag removal is easy. The surfacing layer has excellent corrosion resistance and high temperature wear resistance, and is suitable for surfacing in occasions requiring strong wear resistance.

Description

Technical Field

[0001] The invention relates to the field of welding materials, and in particular to a high-chromium cast iron surfacing welding rod and a preparation method thereof. Background Art

[0002] Wear-resistant spare parts refer to components used in industrial equipment to resist wear and extend the service life of the equipment. These spare parts usually need to have high hardness, strength and corrosion resistance to adapt to harsh working conditions such as high temperature, high pressure, high-speed impact and friction. In actual production, when various wear-resistant spare parts are worn by massive sintered ore, lump ore, coke and various abrasives, slippage, scratching, cutting, grinding and even chiseling are superimposed on each other. Different operating conditions, impact force, temperature, cooling conditions and other factors also have a great influence on material wear. Therefore, the material wear process is relatively complex. Complex working conditions place multiple requirements on materials, especially metallurgical spare parts, which often require heat resistance, wear resistance and impact resistance at the same time. Therefore, high-chromium cast iron suitable for these requirements should be developed to prepare wear-resistant spare parts.

[0003] High-chromium cast iron is a third-generation wear-resistant material, following conventional white cast iron and nickel-hard cast iron. Due to its unique structural characteristics, high-chromium cast iron exhibits significantly higher toughness, high-temperature strength, heat resistance, and wear resistance than conventional cast iron. High-chromium cast iron is hailed as the most superior abrasive wear-resistant material today and is increasingly widely used. However, due to its high cost and difficulty in machining, it requires specialized welding materials for repair or the application of a wear-resistant overlay to meet specific operating requirements. Summary of the Invention

[0004] In view of the above shortcomings of the prior art, the present invention provides a high chromium cast iron surfacing welding rod and a preparation method thereof, which are used to repair high chromium cast iron workpieces or to surfacing a wear-resistant layer on the outside of the workpiece to meet special working conditions.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a high-chromium cast iron cladding electrode, which includes a welding core and a coating coated on the surface of the welding core. The coating includes the following components and the weight proportions of each component are: 85-90 parts of high-carbon ferrochrome, 0.5-1 part of medium-carbon ferromanganese, 1-2 parts of aluminum-magnesium alloy, 1.5-2.5 parts of fluorite, 0.5-1 part of alkaline surface, 0.3-0.8 part of titanium dioxide, 1-2 parts of graphite, 1-2 parts of ferrovanadium, 2-4 parts of boron carbide, 0.5-1 part of carboxymethyl cellulose (CMC), 0.3-0.8 part of microcrystalline cellulose, 0.2-0.6 part of lanthanum boride, and 0.2-0.6 part of cerium oxide.

[0006] In one example of the present invention, the chromium (Cr) content in the high-carbon ferrochrome is 65wt% to 72wt%, and the carbon content is ≥8wt%; the manganese (Mn) content in the medium-carbon ferromanganese is 78wt% to 85wt%; the aluminum (Al) content in the aluminum-magnesium alloy is 47wt% to 53wt%, and the magnesium (Mg) content is ≥47wt%; the calcium fluoride (CaF2) content in the fluorite is ≥95wt%; the sodium carbonate (Na2CO3) content in the alkaline surface is ≥98wt%; the vanadium (V) content in the ferrovanadium is ≥50wt%; the purity of the boron carbide (B4C) is ≥95%; the carbon (C) content in the graphite is ≥80wt%, the purity of the lanthanum boride (LaB6) is ≥95%, and the purity of the cerium oxide (CeO2) is ≥95%.

[0007] In one example of the present invention, the graphite powder has a particle size of 80-120 meshes, the alkaline noodles and the cerium oxide powder have a particle size greater than 200 meshes, and the powder particle sizes of the remaining components are 40-80 meshes.

[0008] In an example of the present invention, the welding core is made of H08 steel core, and the diameter of the welding core is 4.0 mm.

[0009] The present invention also provides a method for preparing a high chromium cast iron cladding electrode, comprising the following steps:

[0010] Weigh the various components of the coating according to the ratio and mix them evenly to obtain coating powder;

[0011] Adding a binder to the coating powder and stirring evenly to form a coating mixture;

[0012] The coating mixture is press-coated on the surface of the welding core and dried to obtain the high chromium cast iron surfacing welding rod.

[0013] In one example of the present invention, the binder is potassium-sodium water glass, and the mass ratio of potassium to sodium in the potassium-sodium water glass binder is 3:1.

[0014] In one example of the present invention, the mass of the binder is 20% to 23% of the total mass of the coating powder.

[0015] In one example of the present invention, the weight of the coating mixture in the high chromium cast iron cladding electrode after drying is 58-62% of the total weight of the high chromium cast iron cladding electrode.

[0016] In an example of the present invention, the pressure during the press coating is 9-13 MPa.

[0017] In an example of the present invention, the drying temperature is 350-380° C., and the drying time is 1-2 hours.

[0018] In the high-chromium cast iron cladding electrode of the present invention, the aluminum-magnesium alloy, fluorite, medium-carbon ferromanganese and Si in the coating play a role in combined deoxidation, dehydrogenation and desulfurization; the cellulose and alkaline surface in the coating play a role in gasification and protection; the Ca, Na, K and Ti elements in the coating can improve arc striking performance and enhance arc stability. By increasing the Cr content and simultaneously increasing the C content and adjusting the appropriate Cr / C ratio, a highly stable and wear-resistant Cr7C3 crystal structure is formed. Adding B, V, La and Ce elements as additives can react with the surface of the Cr7C3 crystal to form new surface particles, thereby promoting the non-uniform nucleation of Cr7C3 carbides. By adjusting the ratio of various elements, the Cr7C3 carbides can be refined and pelletized, further improving the corrosion resistance and wear resistance of the deposited metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 FIG1 is a flow chart of the preparation of a high chromium cast iron cladding electrode according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following examples and the features in the examples can be combined with each other unless they conflict. It should also be understood that the terms used in the examples of the present invention are for the purpose of describing specific embodiments, not for the purpose of limiting the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0022] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0023] When referring to a numerical range herein, unless otherwise specified, the distribution of the values ​​within the numerical range is considered continuous and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical range, as well as every value between the two numerical endpoints. When multiple numerical ranges are provided to describe a feature or characteristic, these numerical ranges may be combined.

[0024] It should be noted that, unless otherwise specified, "%" and "wt%" herein represent mass percentage.

[0025] The present invention provides a high-chromium cast iron cladding electrode, comprising a welding core and a coating coated on the surface of the welding core, wherein the coating comprises the following components, and the weight proportions of the components are as follows: 85-90 parts of high-carbon ferrochromium, 0.5-1 part of medium-carbon ferromanganese, 1-2 parts of aluminum-magnesium alloy, 1.5-2.5 parts of fluorite, 0.5-1 part of alkaline flour, 0.3-0.8 part of titanium dioxide, 1-2 parts of graphite, 1-2 parts of ferrovanadium, 2-4 parts of boron carbide, 0.5-1 part of carboxymethyl cellulose, 0.3-0.8 part of microcrystalline cellulose, 0.2-0.6 part of lanthanum boride, and 0.2-0.6 part of cerium oxide.

[0026] The functions of each component in the drug cover are as follows:

[0027] The Cr content in high carbon ferrochrome is 65wt% to 72wt%, and the C content is ≥8wt%. The main function of high carbon ferrochrome is to alloy Cr and combine with C to form a M7C3 crystal structure, which makes the weld have excellent hardness.

[0028] The Mn content in medium carbon ferromanganese is 78wt% to 85wt%, and it is mainly used as a deoxidizer, alloying agent and desulfurizer. Too much Mn will increase splashing.

[0029] The Al content in aluminum-magnesium alloy is 47wt% to 53wt%, and the Mg content is ≥47wt%. Al and Mg act as strong deoxidizers, which can reduce the oxygen content in the weld and reduce pores. Adding them in appropriate amounts can improve welding processability and increase impact toughness.

[0030] The CaF2 content in fluorite is ≥95wt%. The main function of fluorite is slag formation, and it can also play a role in purifying the deposited metal: calcium can play a role in deoxidation and desulfurization during the welding process, and fluorine can play a role in removing hydrogen.

[0031] The content of Na2CO3 in the alkaline surface is ≥98wt%, which has the function of generating gas to protect the weld during welding, and also has the function of stabilizing the arc and adjusting the basicity of the welding rod.

[0032] Titanium dioxide: Its main function is to form slag, reduce slag viscosity, stabilize the arc and improve weld formation during welding.

[0033] The C content in graphite is ≥80wt%: its main function is to transfer C elements to the deposited metal, thus increasing the hardness of the deposit. It can also play a role in deoxidation and improving the press-coating properties.

[0034] The V content in ferrovanadium is ≥50wt%, and is mainly used for alloying and transition metal V to the deposited metal. V is a strong carbide-forming element and has a strong binding force with C to form a stable VC structure. It is a typical carbide with high melting point, high hardness and high dispersion, which can greatly improve the wear resistance of the alloy.

[0035] The purity of boron carbide is ≥95%, and it is mainly used for transition of B and C elements to form stable carbides and refine grains.

[0036] Carboxymethyl cellulose and microcrystalline cellulose: They generate gas to protect the weld during welding and improve the coating properties of the electrode.

[0037] The purity of lanthanum boride is ≥95%, and it is used to stabilize transition metal elements, improve raw carbides, and refine grains.

[0038] The purity of cerium oxide is ≥95%, and it is used to transition Ce elements, refine the Cr-C structure, and refine the grains.

[0039] In one embodiment, the particle size of the graphite powder is 80-120 meshes, the particle size of the alkaline noodles and the cerium oxide powder is greater than 200 meshes, and the particle size of the powders of the remaining components is 40-80 meshes.

[0040] In one embodiment, the welding core is made of H08 steel core, and the diameter of the welding core is 4.0 mm.

[0041] In the high-chromium cast iron cladding electrode of the present invention, the aluminum-magnesium alloy, fluorite, medium-carbon ferromanganese and Si in the coating play a role in combined deoxidation, dehydrogenation and desulfurization; the cellulose and alkaline surface in the coating play a role in gasification and protection; the Ca, Na, K and Ti elements in the coating can improve arc striking performance and enhance arc stability. By increasing the Cr content and simultaneously increasing the C content and adjusting the appropriate Cr / C ratio, a highly stable and wear-resistant Cr7C3 crystal structure is formed. Adding B, V, La and Ce elements as additives can react with the surface of the Cr7C3 crystal to form new surface particles, thereby promoting the non-uniform nucleation of Cr7C3 carbides. By adjusting the ratio of various elements, the Cr7C3 carbides can be refined and pelletized, further improving the corrosion resistance and wear resistance of the deposited metal.

[0042] See also Figure 1 The present invention also provides a method for preparing a high chromium cast iron cladding electrode, comprising the following steps:

[0043] S1. Weigh the components of the coating according to the ratio and mix them evenly to obtain coating powder;

[0044] S2. Add a binder to the coating powder and stir evenly to form a coating mixture;

[0045] S3. Press-coat the coating mixture on the surface of the welding core and dry it to obtain a high-chromium cast iron cladding electrode.

[0046] In step S1, the coating includes the following components and the weight proportions of each component are: 85-90 parts of high carbon ferrochrome, 0.5-1 part of medium carbon ferromanganese, 1-2 parts of aluminum-magnesium alloy, 1.5-2.5 parts of fluorite, 0.5-1 part of alkaline surface, 0.3-0.8 part of titanium dioxide, 1-2 parts of graphite, 1-2 parts of ferrovanadium, 2-4 parts of boron carbide, 0.5-1 part of carboxymethyl cellulose, 0.3-0.8 part of microcrystalline cellulose, 0.2-0.6 part of lanthanum boride, and 0.2-0.6 part of cerium oxide.

[0047] In step S2, a potassium-sodium water glass binder is used as the binder. The modulus of the binder is 2.8 to 3.1, and the mass ratio of potassium to sodium in the potassium-sodium water glass binder is 3:1. The mass of the binder is 20% to 23% of the total mass of the coating powder, for example, 20%, 21%, 22%, or 23%.

[0048] In step S3, pressure coating, forming, and other operations are performed on conventional hydraulic welding rod production equipment to uniformly pressure-coat the coating mixture on the surface of the welding core. The pressure during pressure coating is 9 to 13 MPa, for example, 9 MPa, 11 MPa, or 13 MPa. After pressure coating, the welding core coated with the coating mixture is dried at a temperature of 350 to 380°C, for example, 350°C, 370°C, or 380°C, and for a drying time of 1 to 2 hours, for example, 1 hour, 1.5 hours, or 2 hours. The weight of the coating mixture after drying is 58 to 62% of the total weight of the high chromium cast iron cladding electrode, for example, 58%, 60%, or 62%.

[0049] The technical solutions of the present invention are described in detail below through several specific examples. Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by conventional methods in the art, and the instruments used in the examples are all commercially available.

[0050] Example 1

[0051] The high-chromium cast iron cladding electrode of this embodiment includes a welding core and a coating, wherein the coating includes the following components, and the weight percentages of each component are as follows: 85 parts of high-carbon ferrochrome, 0.5 parts of medium-carbon ferromanganese, 1 part of aluminum-magnesium alloy, 1.5 parts of fluorite, 0.5 parts of sodium hydroxide, 0.3 parts of titanium dioxide, 1 part of graphite, 1 part of ferrovanadium, 2 parts of boron carbide, 0.5 parts of carboxymethyl cellulose, 0.3 parts of microcrystalline cellulose, 0.2 parts of lanthanum boride, and 0.2 parts of cerium oxide. The above components are mixed uniformly to obtain a coating powder. A water glass binder is added to the coating powder and stirred uniformly to obtain a coating mixture. The coating mixture is press-coated on the surface of the welding core at 13 MPa and dried at 350°C for 1 hour to obtain a high-chromium cast iron cladding electrode. Among them, in this embodiment, the welding core is selected as 4.0mm H08A welding core, the mass of potassium sodium water glass binder is 23% of the total mass of the coating powder, and the mass of the coating mixture after drying accounts for 62% of the total mass of the high chromium cast iron surfacing electrode.

[0052] Example 2

[0053] The high-chromium cast iron hardfacing electrode of this embodiment includes a core and a coating. The coating comprises the following components, with the weight percentages of each component being: 90 parts high-carbon ferrochrome, 1 part medium-carbon ferromanganese, 2 parts aluminum-magnesium alloy, 2.5 parts fluorite, 1 part sodium hydroxide, 0.8 parts titanium dioxide, 2 parts graphite, 2 parts ferrovanadium, 4 parts boron carbide, 1 part carboxymethyl cellulose, 0.8 parts microcrystalline cellulose, 0.6 parts lanthanum boride, and 0.6 parts cerium oxide. The above components are mixed uniformly to obtain a coating powder. A water glass binder is added to the coating powder and stirred uniformly to obtain a coating mixture. The coating mixture is press-coated on the surface of the core at 9 MPa and dried at 360°C for 1.5 hours to obtain the high-chromium cast iron hardfacing electrode. In this embodiment, a 4.0 mm H08A core is used as the core. The mass of the potassium-sodium water glass binder accounts for 20% of the total mass of the coating powder, and the mass of the dried coating mixture accounts for 58% of the total mass of the high-chromium cast iron hardfacing electrode.

[0054] Example 3

[0055] The high-chromium cast iron cladding electrode of this embodiment includes a welding core and a coating, wherein the coating comprises the following components, and the weight percentages of each component are as follows: 88 parts high-carbon ferrochrome, 0.8 parts medium-carbon ferromanganese, 1.5 parts aluminum-magnesium alloy, 2 parts fluorite, 0.7 parts sodium hydroxide, 0.6 parts titanium dioxide, 1.3 parts graphite, 1.6 parts ferrovanadium, 3 parts boron carbide, 0.7 parts carboxymethyl cellulose, 0.7 parts microcrystalline cellulose, 0.4 parts lanthanum boride, and 0.4 parts cerium oxide. The above components are mixed uniformly to obtain a coating powder, a water glass binder is added to the coating powder, and stirred uniformly to obtain a coating mixture, which is press-coated on the surface of the welding core at 10 MPa and dried at 380° C. for 2 hours to obtain the high-chromium cast iron cladding electrode. Among them, in this embodiment, the welding core is selected as 4.0mm H08A welding core, the mass of potassium sodium water glass binder is 22% of the total mass of the coating powder, and the mass of the coating mixture after drying accounts for 60% of the total mass of the high chromium cast iron surfacing electrode.

[0056] Comparative Example

[0057] The high chromium cast iron cladding electrode of this comparative example includes a welding core and a coating, wherein the coating includes the following components and the weight proportions of each component are respectively: 70 parts of high carbon ferrochrome, 0.5 parts of medium carbon ferromanganese, 1 part of aluminum-magnesium alloy, 2.5 parts of fluorite, 0.6 parts of alkaline alkali, 0.5 parts of titanium dioxide, 0.5 parts of graphite, 1.0 parts of ferrovanadium, 1 part of boron carbide, 0.6 parts of carboxymethyl cellulose, 0.5 parts of microcrystalline cellulose, 0.2 parts of lanthanum boride, and 0.2 parts of cerium oxide. The above components are mixed uniformly to obtain a coating powder, a water glass binder is added to the coating powder and stirred uniformly to obtain a coating mixture, the coating mixture is press-coated on the surface of the welding core at 10 MPa, and dried at 380° C. for 2 hours to obtain the high chromium cast iron cladding electrode. Among them, in this embodiment, the welding core is selected as 4.0mm H08A welding core, the mass of potassium sodium water glass binder is 22% of the total mass of the coating powder, and the mass of the coating mixture after drying accounts for 60% of the total mass of the high chromium cast iron surfacing electrode.

[0058] Table 1: Welding rod parameters of Examples 1 to 3

[0059]

[0060] To further validate the efficacy of the present invention, cladding welding tests were conducted on high-chromium cast iron using the electrodes of Examples 1 to 3 and the comparative example in accordance with relevant standards and specifications in the field, and the welding performance was tested. Reverse direct current connection was used during welding. The composition of the deposited metal after welding is shown in Table 2, and the welding performance test results are shown in Table 3. It should be noted that for each test, HRC (Rockwell hardness) hardness test was performed on the deposited metal at three different points.

[0061] Table 2: Chemical composition of deposited metals in Examples 1 to 3

[0062]

[0063] Table 3: Welding performance of Examples 1 to 3 and Comparative Example

[0064]

[0065] As can be seen from Table 3, the high chromium cast iron cladding electrode of the present invention has good welding processability, good hardness and wear resistance, and the HRC hardness of the deposited metal is uniform and stable; the hardness and wear resistance of the deposited metal of the electrode prepared in the comparative example are poor, and it is not suitable for welding wear-resistant materials.

[0066] The high-chromium cast iron hardfacing welding rod of the present invention has a hypereutectic carbide structure with fine, evenly distributed carbide particles in a pelletized form. It has high hardness and excellent resistance to low-angle impact corrosion and high-temperature wear under harsh conditions, as well as good wear resistance and toughness. During welding, the arc is stable, spatter and slag are minimal, and slag removal is easy. The hardfacing layer also exhibits excellent corrosion and high-temperature wear resistance, making it suitable for hardfacing high-chromium cast iron. Therefore, the present invention effectively overcomes some practical problems in the prior art and thus has high utility value and practical significance.

[0067] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A high chromium cast iron cladding electrode, characterized in that: The invention comprises a welding core and a coating coated on the surface of the welding core, wherein the coating is composed of the following components, and the weight proportions of the components are respectively: 85-90 parts of high-carbon ferrochrome, 0.5-1 part of medium-carbon ferromanganese, 1-2 parts of aluminum-magnesium alloy, 1.5-2.5 parts of fluorite, 0.5-1 part of alkaline surface, 0.3-0.8 part of titanium dioxide, 1-2 parts of graphite, 1-2 parts of ferrovanadium, 2-4 parts of boron carbide, 0.5-1 part of carboxymethyl cellulose, 0.3-0.8 part of microcrystalline cellulose, 0.2-0.6 part of lanthanum boride, and 0.2-0.6 part of cerium oxide.

2. The high chromium cast iron cladding electrode according to claim 1, characterized in that: The chromium content of the high-carbon ferrochrome is 65wt%~72wt%, and the carbon content is ≥8wt%; the manganese content of the medium-carbon ferromanganese is 78wt%~85wt%; the aluminum content of the aluminum-magnesium alloy is 47wt%~53wt%, and the magnesium content is ≥47wt%; the calcium fluoride content of the fluorite is ≥95wt%; the sodium carbonate content of the alkaline surface is ≥98wt%; the vanadium content of the ferrovanadium is ≥50wt%; the purity of the boron carbide is ≥95%; the carbon content of the graphite is ≥80wt%, the purity of the lanthanum boride is ≥95%, and the purity of the cerium oxide is ≥95%.

3. The high chromium cast iron cladding electrode according to claim 1, characterized in that: The graphite powder has a particle size of 80 to 120 meshes, the alkaline noodles and the cerium oxide powder have a particle size greater than 200 meshes, and the powder particle sizes of the remaining components are 40 to 80 meshes.

4. The high chromium cast iron cladding electrode according to claim 1, characterized in that: The welding core is made of H08 steel core, and the diameter of the welding core is 4.0 mm.

5. A method for preparing a high chromium cast iron cladding electrode according to any one of claims 1 to 4, characterized in that: The steps include: Weigh the various components of the coating according to the ratio and mix them evenly to obtain coating powder; Adding a binder to the coating powder and stirring evenly to form a coating mixture; The coating mixture is press-coated on the surface of the welding core and dried to obtain the high chromium cast iron surfacing welding rod.

6. The preparation method according to claim 5, characterized in that The binder is potassium-sodium water glass, and the mass ratio of potassium to sodium in the potassium-sodium water glass binder is 3:

1.

7. The preparation method according to claim 5, characterized in that The mass of the binder is 20% to 23% of the total mass of the coating powder.

8. The preparation method according to claim 5, characterized in that The weight of the coating mixture in the high chromium cast iron cladding welding rod after drying is 58-62% of the total weight of the high chromium cast iron cladding welding rod.

9. The preparation method according to claim 5, characterized in that The pressure during the press coating is 9-13 MPa.

10. The preparation method according to claim 5, characterized in that The drying temperature is 350-380° C., and the drying time is 1-2 hours.

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