A high-temperature wear-resistant material for rotary hearth furnace blades and a method for preparing rotary hearth furnace blades.

Abstract

This invention discloses a high-temperature wear-resistant material for rotary hearth furnace blades and a method for preparing rotary hearth furnace blades. The material comprises the following components by mass percentage: C: 1.25~1.55%, Si: 5.6~6.8%, Mn: 1.2~1.5%, Cr: 8.5~10.5%, Ni: 22~25%, Co: 5.2~7.2%, Mo: 0.5~1%, W: 3.8~5.5%, Ta: 1.5~2.8%, Al: 5.3~5.9%, Ti: 0.08~0.14%, Y: 0.01~0.03%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities. This invention yields an excellent microstructure with a Ni3Al phase as the base and a dispersed distribution of carbide wear-resistant phases, ensuring the alloy's high-temperature strength and wear resistance, effectively solving the problem of rapid wear and frequent replacement of rotary hearth furnace blades.

Description

Technical Field

[0001] This invention belongs to the technical field of wear-resistant materials for rotary hearth furnaces, and in particular relates to a high-temperature wear-resistant material for rotary hearth furnace blades and a method for preparing rotary hearth furnace blades. Background Technology

[0002] Rotary hearth furnace coal-based direct reduction technology is a new ironmaking process developed in the last 30 years, which can effectively solve the problem of recycling waste iron-containing dust in steel plants. This technology involves mixing waste dust with pulverized coal, forming pellets, and feeding them into a rotary hearth furnace. After high-temperature reduction at 1200-1350℃, metallized pellets are obtained, which are then discharged by continuously rotating spiral blades. Throughout the operation of the rotary hearth furnace, the spiral blades are in direct contact with the metallized pellets inside the furnace, enduring harsh high-temperature friction and wear conditions for extended periods, resulting in severe blade wear. When the blades wear to a certain extent, incomplete discharge leads to charge caking, further exacerbating blade wear. Chinese Patent Publication No. CN217844751U discloses a high-temperature resistant spiral blade, discharge device, and discharge machine for a rotary hearth furnace spiral discharger. It indicates that once the blade tip wears more than 1 / 3 of its length, the entire blade is scrapped, with a service life generally of 1-4 months, and a maximum of 6 months.

[0003] Currently, the vast majority of rotary hearth furnace spiral blades in China are made of high-nickel, high-chromium heat-resistant steel. This material has an austenitic microstructure, possessing certain plasticity, toughness, and high-temperature resistance, but its strength and hardness are poor, making it difficult to withstand harsh working conditions such as high-pressure stress and high wear. Moreover, it is very expensive, hindering the reduction of production costs. In addition, there are a small number of blades made of metal-ceramic composite materials and blades with end-welded wear-resistant layers. Both types of blades have relatively complex forming processes and their own drawbacks. For example, metal-ceramic composite blades have poor toughness and are prone to breakage; end-welded wear-resistant layer blades have unavoidable defects such as internal stress and porosity, resulting in unsatisfactory performance.

[0004] Therefore, in view of the above situation, it is urgent to develop a new material to fundamentally solve the problems of poor high-temperature wear resistance and short service life of rotary hearth furnace spiral blades. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a high-temperature wear-resistant material for rotary hearth furnace blades and a method for preparing rotary hearth furnace blades. The high-temperature wear-resistant material for rotary hearth furnace blades prepared by this invention can effectively solve the problem of excessive wear and frequent replacement of rotary hearth furnace blades.

[0006] This invention is implemented as follows:

[0007] A high-temperature wear-resistant material for rotary hearth furnace blades comprises, by mass percentage, the following components: C: 1.25~1.55%, Si: 5.6~6.8%, Mn: 1.2~1.5%, Cr: 8.5~10.5%, Ni: 22~25%, Co: 5.2~7.2%, Mo: 0.5~1%, W: 3.8~5.5%, Ta: 1.5~2.8%, Al: 5.3~5.9%, Ti: 0.08~0.14%, Y: 0.01~0.03%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities.

[0008] Preferably, by mass percentage, it comprises the following components: C: 1.3~1.55%, Si: 5.8~6.6%, Mn: 1.3~1.5%, Cr: 8.8~10.5%, Ni: 23~25%, Co: 5.2~6.8%, Mo: 0.5~0.8%, W: 4.0~5.5%, Ta: 1.7~2.8%, Al: 5.4~5.8%, Ti: 0.08~0.1%, Y: 0.02~0.03%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities.

[0009] More preferably, by mass percentage, it comprises the following components: C: 1.35~1.5%, Si: 5.9~6.4%, Mn: 1.38~1.5%, Cr: 9.0~10.2%, Ni: 23.5~25%, Co: 5.4~6.6%, Mo: 0.6~0.7%, W: 4.3~5.4%, Ta: 2.2~2.6%, Al: 5.5~5.8%, Ti: 0.09~0.1%, Y: 0.02~0.03%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities.

[0010] The preferred composition, by mass percentage, comprises the following components: C: 1.45%, Si: 6.3%, Mn: 1.42%, Cr: 10%, Ni: 24%, Co: 6.5%, Mo: 0.68%, W: 5.2%, Ta: 2.5%, Al: 5.7%, Ti: 0.1%, Y: 0.01%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities.

[0011] The above-mentioned method for preparing rotary hearth furnace blades includes the following steps:

[0012] Step 1, Ingredients

[0013] Weigh the steel, low-carbon ferrochrome, high-carbon ferrochrome, ferrosilicon, ferromanganese, ferromolybdenum, ferrotungsten, nickel plate, aluminum plate, sponge titanium, tantalum powder, cobalt powder, and rare earth raw materials according to the target content of each component mentioned above.

[0014] Step 2, Vacuum Induction Melting

[0015] S21. Filler: Add ferrosilicon, nickel plate, low carbon ferrochrome and high carbon ferrochrome raw materials into the smelting furnace, first draw a vacuum and then introduce argon gas;

[0016] S22. Melting: Electricity is supplied to melt the raw materials, forming a molten pool. Then steel, ferromolybdenum, ferrotungsten, aluminum plate, sponge titanium, tantalum powder, cobalt powder, and rare earth are added. The melting temperature is 1630~1680℃ until all raw materials are completely melted.

[0017] S23. Deoxidation: After smelting, ferrosilicon and ferromanganese are added to the molten steel for deoxidation, and the temperature is maintained for 10-20 minutes.

[0018] S24. Electromagnetic slag removal: Turn off the smelting magnetic field and then turn on the slag removal magnetic field. Utilize the difference in conductivity between liquid metal and slag to separate the slag from the liquid metal under the action of the electromagnetic field, thereby removing the slag. The slag removal time is 5~8 minutes.

[0019] Step 3, Pouring

[0020] After the temperature of the molten steel drops to 1550~1580℃, it is poured into a mold to obtain the as-cast blade.

[0021] Step 4, heat treatment

[0022] S41. Quenching treatment: Heat the cast blade to 900~950℃ and hold for 2~4 hours, then raise the temperature to 1100~1180℃ and hold for 3~5 hours, then oil cool to room temperature;

[0023] S42. Tempering treatment: Heat the quenched blades to 850~870℃ and hold for 24~36h, then air cool to room temperature to obtain the rotary hearth furnace blades with dispersion strengthening of precipitated phase.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] This invention, through the rational use of elements such as Ni, Al, W, and Cr and a segmented heat treatment process, achieves an excellent microstructure with a Ni3Al phase as the base and a dispersed distribution of wear-resistant carbide phases, ensuring the alloy's high-temperature strength and wear resistance. Furthermore, due to the presence of retained austenite in the alloy, the strong extrusion force between the rotary hearth furnace blades and the metallized pellets during operation causes work hardening on the blade surface, making it harder and more wear-resistant. Testing shows that the alloy steel of this invention has a room temperature tensile strength of not less than 1000 MPa, a high-temperature tensile strength of not less than 600 MPa at 1000℃, an impact energy of not less than 10 J, a room temperature hardness of not less than 60 HRC, and a high-temperature hardness of not less than 50 HRC. Its application in industrial production can significantly improve the service life of rotary hearth furnace blades and reduce the frequency of maintenance and replacement. Attached Figure Description

[0026] Figure 1 This is the microstructure of the rotary hearth furnace blades in Embodiment 1 of the present invention under a scanning electron microscope. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] Example 1

[0029] The high-temperature wear-resistant material used for the rotary hearth furnace blades in this embodiment has the following target contents (by mass percentage): C: 1.44%, Si: 6.28%, Mn: 1.42%, Cr: 10.12%, Ni: 23.88%, Co: 6.52%, Mo: 0.69%, W: 5.26%, Ta: 2.49%, Al: 5.73%, Ti: 0.11%, Y: 0.01%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities.

[0030] The rotary hearth furnace blades are prepared according to the following steps:

[0031] Step 1, Ingredients

[0032] Weigh the steel, low-carbon ferrochrome, high-carbon ferrochrome, ferrosilicon, ferromanganese, ferromolybdenum, ferrotungsten, nickel plate, aluminum plate, sponge titanium, tantalum powder, cobalt powder, and rare earth according to the target content of each component mentioned above.

[0033] Step 2, Vacuum Induction Melting

[0034] S21. Filler: Add ferrosilicon, nickel plate, low carbon ferrochrome, and high carbon ferrochrome into the smelting furnace, evacuate to 2~3 Pa, and then introduce high-purity argon gas.

[0035] S22. Melting: Electricity is supplied to melt the metal, forming a molten pool. Then steel, ferromolybdenum, ferrotungsten, aluminum plate, sponge titanium, tantalum powder, cobalt powder, and rare earth are added. The melting temperature is 1630~1650℃ and the melting time is 25min.

[0036] S23, Deoxidation: After smelting, ferrosilicon and ferromanganese are added to the molten steel for deoxidation, and the mixture is kept at this temperature for 10 minutes.

[0037] S24. Electromagnetic slag removal: Turn off the smelting magnetic field, then turn on the slag removal magnetic field. Utilizing the difference in conductivity between liquid metal and slag, the slag and liquid metal are separated under the action of the electromagnetic field, thereby removing the slag. The slag removal time is 5 minutes.

[0038] Step 3, Pouring

[0039] After the temperature of the molten steel drops to 1560℃, it is poured into a mold to obtain the as-cast blade.

[0040] Step 4, heat treatment

[0041] S41. Quenching treatment: Heat the cast blade to 930~950℃ and hold for 2 hours, then raise the temperature to 1150~1180℃ and hold for 3 hours, then oil cool to room temperature.

[0042] S42. Tempering treatment: The quenched blades are heated to 870℃, held for 24 hours, and then air-cooled to room temperature to obtain the rotary hearth furnace blades with dispersion strengthening of precipitated phase.

[0043] Example 2

[0044] The target content of each component in the high-temperature wear-resistant material for the rotary hearth furnace blades in this embodiment is (by mass percentage): C: 1.51%, Si: 6.14%, Mn: 1.41%, Cr: 9.62%, Ni: 23.79%, Co: 5.64%, Mo: 0.66%, W: 4.61%, Ta: 2.3%, Al: 5.67%, Ti: 0.12%, Y: 0.01%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities.

[0045] The rotary hearth furnace blades are prepared according to the following steps:

[0046] Step 1, Ingredients

[0047] Weigh the steel, low-carbon ferrochrome, high-carbon ferrochrome, ferrosilicon, ferromanganese, ferromolybdenum, ferrotungsten, nickel plate, aluminum plate, sponge titanium, tantalum powder, cobalt powder, and rare earth according to the target content of each component mentioned above.

[0048] Step 2, Vacuum Induction Melting

[0049] S21. Filler: Add ferrosilicon, nickel plate, low carbon ferrochrome, and high carbon ferrochrome into the smelting furnace, evacuate to 3~4 Pa, and then introduce high-purity argon gas.

[0050] S22. Melting: Electricity is supplied to melt the metal, forming a molten pool. Then steel, ferromolybdenum, ferrotungsten, aluminum plate, sponge titanium, tantalum powder, cobalt powder, and rare earth are added. The melting temperature is 1640~1680℃ and the melting time is 30min.

[0051] S23, Deoxidation: After smelting, ferrosilicon and ferromanganese are added to the molten steel for deoxidation, and the mixture is kept at this temperature for 15 minutes.

[0052] S24. Electromagnetic slag removal: Turn off the smelting magnetic field, then turn on the slag removal magnetic field. Utilizing the difference in conductivity between liquid metal and slag, the slag and liquid metal are separated under the action of the electromagnetic field, thereby removing the slag. The slag removal time is 5 minutes.

[0053] Step 3, Pouring

[0054] After the temperature of the molten steel drops to 1580℃, it is poured into a mold to obtain the as-cast blade.

[0055] Step 4, heat treatment

[0056] S41. Quenching treatment: Heat the cast blade to 900~930℃ and hold for 4 hours, then raise the temperature to 1100~1140℃ and hold for 5 hours, then oil cool to room temperature.

[0057] S42. Tempering treatment: After quenching, the blade is heated to 850℃, held for 30 hours, and then air-cooled to room temperature to obtain a rotary hearth furnace blade with dispersion strengthening of precipitated phase.

[0058] Example 3

[0059] The high-temperature wear-resistant material used for the rotary hearth furnace blades in this embodiment has the following target contents (by mass percentage): C: 1.28%, Si: 5.78%, Mn: 1.25%, Cr: 9.2%, Ni: 22.34%, Co: 5.32%, Mo: 0.92%, W: 4%, Ta: 1.62%, Al: 5.42%, Ti: 0.08%, Y: 0.02%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities.

[0060] The rotary hearth furnace blades are prepared according to the following steps:

[0061] Step 1, Ingredients

[0062] Weigh the steel, low-carbon ferrochrome, high-carbon ferrochrome, ferrosilicon, ferromanganese, ferromolybdenum, ferrotungsten, nickel plate, aluminum plate, sponge titanium, tantalum powder, cobalt powder, and rare earth according to the target content of each component mentioned above.

[0063] Step 2, Vacuum Induction Melting

[0064] S21. Filler: Add ferrosilicon, nickel plate, low carbon ferrochrome, and high carbon ferrochrome into the smelting furnace, evacuate to 2~3 Pa, and then introduce high-purity argon gas.

[0065] S22. Melting: Electricity is supplied to melt the metal, and steel, ferromolybdenum, ferrotungsten, aluminum plate, sponge titanium, tantalum powder, cobalt powder, and rare earth are added after forming a molten pool. The melting temperature is 1630~1640℃ and the melting time is 30min.

[0066] S23. Deoxidation: After smelting, ferrosilicon and ferromanganese are added to the molten steel for deoxidation, and the mixture is kept at this temperature for 20 minutes.

[0067] S24. Electromagnetic slag removal: Turn off the smelting magnetic field and then turn on the slag removal magnetic field. Utilize the difference in conductivity between liquid metal and slag to separate the slag from the liquid metal under the action of the electromagnetic field, thereby removing the slag. The slag removal time is 7 minutes.

[0068] Step 3, Pouring

[0069] After the temperature of the molten steel drops to 1550℃, it is poured into a mold to obtain the as-cast blade.

[0070] Step 4, heat treatment

[0071] S41. Quenching treatment: Heat the cast blade to 910~930℃ and hold for 3 hours, then raise the temperature to 1130~1160℃ and hold for 4 hours, then oil cool to room temperature.

[0072] S42. Tempering treatment: After quenching, the blade is heated to 850℃, held for 36 hours, and then air-cooled to room temperature to obtain a rotary hearth furnace blade with dispersion strengthening of precipitated phase.

[0073] Example 4

[0074] The high-temperature wear-resistant material used for the rotary hearth furnace blades in this embodiment has the following target contents (by mass percentage): C: 1.32%, Si: 5.62%, Mn: 1.3%, Cr: 8.84%, Ni: 24.78%, Co: 6.77%, Mo: 0.55%, W: 3.82%, Ta: 2%, Al: 5.55%, Ti: 0.12%, Y: 0.03%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities.

[0075] The rotary hearth furnace blades are prepared according to the following steps:

[0076] Step 1, Ingredients

[0077] Weigh the steel, low-carbon ferrochrome, high-carbon ferrochrome, ferrosilicon, ferromanganese, ferromolybdenum, ferrotungsten, nickel plate, aluminum plate, sponge titanium, tantalum powder, cobalt powder, and rare earth according to the target content of each component mentioned above.

[0078] Step 2, Vacuum Induction Melting

[0079] S21. Filler: Add ferrosilicon, nickel plate, low carbon ferrochrome, and high carbon ferrochrome into the smelting furnace, evacuate to 3~4 Pa, and then introduce high-purity argon gas.

[0080] S22. Melting: Electricity is supplied to melt the metal, and steel, ferromolybdenum, ferrotungsten, aluminum plate, sponge titanium, tantalum powder, cobalt powder, and rare earth are added after forming a molten pool. The melting temperature is 1640~1660℃ and the melting time is 30min.

[0081] S23. Deoxidation: After smelting, ferrosilicon and ferromanganese are added to the molten steel for deoxidation, and the mixture is kept at this temperature for 20 minutes.

[0082] S24. Electromagnetic slag removal: Turn off the smelting magnetic field, then turn on the slag removal magnetic field. Utilizing the difference in conductivity between liquid metal and slag, the slag and liquid metal are separated under the action of the electromagnetic field, thereby removing the slag. The slag removal time is 8 minutes.

[0083] Step 3, Pouring

[0084] After the temperature of the molten steel drops to 1580℃, it is poured into a mold to obtain the as-cast blade.

[0085] Step 4, heat treatment

[0086] S41. Quenching treatment: Heat the cast blade to 920~940℃ and hold for 3 hours, then raise the temperature to 1140~1170℃ and hold for 5 hours, then oil cool to room temperature.

[0087] S42. Tempering treatment: The quenched blades are heated to 860℃, held for 32 hours, and then air-cooled to room temperature to obtain the rotary hearth furnace blades with dispersion strengthening of precipitated phase.

[0088] Comparative Example

[0089] The comparative example is the standard material ZG40Ni35Cr26Si2, with a maximum operating temperature of 1050℃ and a tensile strength of not less than 440MPa. It is commonly used as wear-resistant parts such as the central cylinder of the cyclone separator in a circulating fluidized bed boiler.

[0090] The chemical composition of ZG40Ni35Cr26Si2 is as follows: C: 0.3~0.5%, Si: 1~2.5%, Mn: 2%, Cr: 24~27%, Ni: 33~36%, Mo: 0.5%, S: ≤0.03%, P: ≤0.04%.

[0091] The components of Examples 1-4 and the comparative examples are shown in Table 1.

[0092] Table 1. Components (%) of Examples 1-2 and Comparative Examples

[0093]

[0094] The rotary hearth furnace blades obtained in Examples 1-4 of this invention were wire-cut into 10×10×10mm metal pieces, which were then ground and polished before being observed under a scanning electron microscope. The microstructure of the sample from Example 1 is shown below. Figure 1 As shown, the target microstructure of Ni3Al matrix + carbide wear-resistant phase is achieved; the rotary hearth furnace blades of each embodiment and the comparative example were prepared according to the corresponding standards and their various properties were tested. The specific results are as follows:

[0095] 1. Room temperature and high temperature Rockwell hardness

[0096] The room temperature Rockwell hardness was tested according to GB / T 230.1-2018 "Metallic materials - Rockwell hardness test - Part 1: Test method" for the examples and comparative examples. The high temperature Rockwell hardness was tested according to T / CSTM 00649-2021 "Metallic materials - High temperature Rockwell hardness test method" for the examples and comparative examples. The test results are shown in Table 2.

[0097] Table 2. Hardness at room temperature and high temperature

[0098]

[0099] 2. Impact performance (unnotched specimen)

[0100] Impact tests were conducted on the examples and comparative examples according to the test standard GB / T 229-2020 "Metallic Materials Charpy Pendulum Impact Test Method", and the results are shown in Table 3.

[0101] Table 3 Impact Performance

[0102]

[0103] 3. Tensile strength at room temperature and high temperature

[0104] Room temperature tensile tests were conducted according to standard GB / T 228.1-2010 "Metallic materials - Tensile testing - Part 1: Room temperature test method" for both examples and comparative examples. High temperature tensile tests were conducted according to standard GB / T 4338-2006 "Metallic materials - High temperature tensile test method" for both examples and comparative examples. The results are shown in Table 4.

[0105] Table 4. High-Temperature Tensile Strength

[0106]

[0107] In summary, the material of this invention, due to its unique design concept of "Ni3Al-based + carbide wear-resistant phase", has achieved excellent properties of high hardness, high wear resistance, and high strength and toughness. When applied to the spiral blades of a rotary hearth furnace, it can significantly extend the service life and reduce the maintenance frequency.

[0108] The embodiments described above are only used to clearly illustrate the technical ideas and effects of the present invention, and are intended to enable those skilled in the art to understand the ideas and features of the present invention. The patent scope of the present invention should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. A high-temperature wear-resistant material for rotary hearth furnace blades, characterized in that: Based on mass percentage, it contains the following components: C: 1.25~1.55%, Si: 5.6~6.8%, Mn: 1.2~1.5%, Cr: 8.5~10.5%, Ni: 22~25%, Co: 5.2~7.2%, Mo: 0.5~1%, W: 3.8~5.5%, Ta: 1.5~2.8%, Al: 5.3~5.9%, Ti: 0.08~0.14%, Y: 0.01~0.03%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities; The room temperature tensile strength is not less than 1000MPa, the high temperature tensile strength at 1000℃ is not less than 600MPa, the impact energy is not less than 10J, the room temperature hardness is not less than 60HRC, and the high temperature hardness is not less than 50HRC.

2. The high-temperature wear-resistant material for rotary hearth furnace blades according to claim 1, characterized in that: Based on mass percentage, it contains the following components: C: 1.3~1.55%, Si: 5.8~6.6%, Mn: 1.3~1.5%, Cr: 8.8~10.5%, Ni: 23~25%, Co: 5.2~6.8%, Mo: 0.5~0.8%, W: 4.0~5.5%, Ta: 1.7~2.8%, Al: 5.4~5.8%, Ti: 0.08~0.1%, Y: 0.02~0.03%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities.

3. The high-temperature wear-resistant material for rotary hearth furnace blades according to claim 2, characterized in that: Based on mass percentage, it contains the following components: C: 1.35~1.5%, Si: 5.9~6.4%, Mn: 1.38~1.5%, Cr: 9.0~10.2%, Ni: 23.5~25%, Co: 5.4~6.6%, Mo: 0.6~0.7%, W: 4.3~5.4%, Ta: 2.2~2.6%, Al: 5.5~5.8%, Ti: 0.09~0.1%, Y: 0.02~0.03%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities.

4. The high-temperature wear-resistant material for rotary hearth furnace blades according to claim 3, characterized in that: By mass percentage, it contains the following components: C: 1.45%, Si: 6.3%, Mn: 1.42%, Cr: 10%, Ni: 24%, Co: 6.5%, Mo: 0.68%, W: 5.2%, Ta: 2.5%, Al: 5.7%, Ti: 0.1%, Y: 0.01%, S: ≤0.035%, P: ≤0.035%, with the remainder being Fe and other unavoidable impurities.

5. A method for preparing rotary hearth furnace blades, wherein the raw material used for the rotary hearth furnace blades is the high-temperature wear-resistant material as described in any one of claims 1 to 4, characterized in that, Includes the following steps: Step 1, Ingredients Weigh the steel, low-carbon ferrochrome, high-carbon ferrochrome, ferrosilicon, ferromanganese, ferromolybdenum, ferrotungsten, nickel plate, aluminum plate, sponge titanium, tantalum powder, cobalt powder, and rare earth raw materials according to the target content of each component of the above-mentioned high-temperature wear-resistant materials. Step 2, Vacuum Induction Melting S21. Filler: Add ferrosilicon, nickel plate, low carbon ferrochrome and high carbon ferrochrome raw materials into the smelting furnace, first draw a vacuum and then introduce argon gas; S22. Melting: Electricity is supplied to melt the raw materials, forming a molten pool. Then steel, ferromolybdenum, ferrotungsten, aluminum plate, sponge titanium, tantalum powder, cobalt powder, and rare earth are added. The melting temperature is 1630~1680℃ until all raw materials are completely melted. S23. Deoxidation: After smelting, ferrosilicon and ferromanganese are added to the molten steel for deoxidation, and the temperature is maintained for 10-20 minutes. S24. Electromagnetic slag removal: Turn off the smelting magnetic field and then turn on the slag removal magnetic field. Utilize the difference in conductivity between liquid metal and slag to separate the slag from the liquid metal under the action of the electromagnetic field, thereby removing the slag. The slag removal time is 5~8 minutes. Step 3, Pouring After the temperature of the molten steel drops to 1550~1580℃, it is poured into a mold to obtain the as-cast blade. Step 4, heat treatment S41. Quenching treatment: Heat the cast blade to 900~950℃ and hold for 2~4 hours, then raise the temperature to 1100~1180℃ and hold for 3~5 hours, then oil cool to room temperature; S42. Tempering treatment: Heat the quenched blades to 850~870℃ and hold for 24~36h, then air cool to room temperature to obtain the rotary hearth furnace blades with dispersion strengthening of precipitated phase.

Images