K418 master alloy smelting process

Abstract

A K418 master alloy smelting process of the present application separates each raw material according to the subsequent adding order by an intelligent drying machine, and separately carries out temperature rising baking, which is in a step-by-step manner; first, rising to 100-120 DEG C, which is beneficial to surface water vapor emission, and treating for 1-2 hours at this temperature; then, rising to 145-185 DEG C, which is for further internal dehydration, and also can prevent the raw material from bursting due to the existence of water in the subsequent process, and treating for 2-2.5 hours at this temperature; then, rising to 380-480 DEG C, and treating for 6 hours; the separated step-by-step drying operation can effectively remove the H, N and O content in the raw material, so that the service life of the final product is prolonged.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, specifically to a K418 master alloy smelting process. Background Technology

[0002] K418 master alloy is a high-temperature casting alloy, and the finished products are usually used in high-temperature resistant components such as turbine blades, turbines, and guide vanes. In the quality standards of K418 master alloy, the ratio of H, N, and O elements is often a relatively important factor, as it determines the service life of the K418 master alloy. The lower the ratio of H, N, and O elements, the longer the service life of the K418 master alloy.

[0003] In the existing K418 master alloy production process, the heat treatment of raw materials is often insufficient, making it difficult to reduce the proportion of H, N, and O elements in the finished K418 master alloy. Summary of the Invention

[0004] The purpose of this invention is to provide a K418 master alloy smelting process to solve the above-mentioned problems.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a K418 master alloy smelting process, comprising the following steps: Step 1: Raw material preparation. Prepare the raw materials according to their elemental composition. The raw materials include carbon (C) 0.11%-0.21%, chromium (Cr) 11.2%-14.4%, molybdenum (Mo) 2%-5%, niobium (Nb) 2%-4%, aluminum (Al) 4.9%-6.6%, titanium (Ti) 0.5%-1%, boron (B) 0.005%-0.012%, zirconium (Zr) 0.1%-0.12%, and the remainder is nickel (Ni). Step 2: Place the raw materials from Step 1 into the intelligent industrial dryer. The intelligent dryer will separate the raw materials according to the order of subsequent additions and heat and bake them individually in a stepped manner. First, heat to 100℃-120℃ and treat at this temperature for 1-2 hours; then heat to 145℃-185℃ and treat at this temperature for 2-2.5 hours; then heat to 380℃-480℃ and hold for 6 hours.

[0006] Step 3: Place the raw materials in a vacuum induction melting furnace in sequence for melting. The order in which the raw materials are added during the melting process varies. The melting temperature is 1500℃-1600℃, and the melting vacuum degree is 2pa-5pa. After complete melting, molten steel is obtained.

[0007] Step 4: Cast the molten steel to obtain the K418 master alloy rod.

[0008] The intelligent industrial dryer used in the above process includes a machine body and a trolley. The machine body is fixedly mounted on a base plate. A drying chamber is provided inside the machine body to dry the raw materials. A guide rail is provided on the base plate at the bottom of the drying chamber. A pulley group is provided at the bottom of the trolley. A first blower assembly and heating wire are fixedly installed on both sides of the drying chamber, and a second blower assembly and heating wire are installed inside the drying chamber. A feed pipe and a side plate are fixedly installed on the trolley. Several intermediate pipes are fixed between the feed pipe and the side plate. The intermediate pipes are perpendicular to the feed pipe. A material channel with a top opening is opened in the feed pipe. A chamber is opened in the intermediate pipe and connects to the material channel. A through groove is provided at the bottom of the chamber and penetrates the intermediate pipe. The number of sliding grooves is the same as the number of intermediate pipes in the side wall of the material channel. A guide plate is slidably installed in each sliding groove. The guide plate is connected to a locking component. After the locking component is released, the guide plate is slidable along the guide plate. The guide plate can block the material channel and align it with its corresponding chamber. At this time, raw materials are added into the material channel. The raw materials will flow into the corresponding chamber under the guidance of the guide plate and fall out of the through groove. A loading plate is provided at the bottom of each intermediate pipe. A material trough is opened in the loading plate. Each material trough is used to load raw materials in different addition orders.

[0009] Preferably, the locking assembly includes a support plate fixed to the feed tube, a slot is provided in the middle of the support plate, and a first hole and a second hole are provided on the support plate that pass through the slot and the support plate. An insert is fixed at the bottom of the guide plate and inserted into the slot. Two insertion holes are provided on the insert. A bolt passes through the second hole and the bottom insertion hole to lock the insert. The bolt is fitted with a nut.

[0010] Preferably, an electrical control box is fixedly installed on the machine body, and a temperature sensor is installed in the drying chamber.

[0011] Preferably, a ventilation slot is provided on one side of each of the intermediate tubes, the ventilation slot communicating with the chamber, and the ventilation slot facing one of the first blower groups.

[0012] Preferably, the channel is designed to increase in size, with the end closest to the second blower assembly being the largest and the end closest to the feed pipe being the smallest. Raw materials entering the chamber will fall into different positions in the channel due to their different sizes, with larger raw materials falling closer to the second blower assembly.

[0013] Preferably, the material trough consists of a protrusion and two inclined surfaces. The protrusion is aligned with the through groove and is raised in the middle. The two inclined surfaces are designed to be angled outward. Raw materials falling into the through groove will hit the protrusion and move to the edge of the material trough under the guidance of one of the inclined surfaces. This allows the raw materials to move preferentially to the edge of the material trough and thus get closer to the first blower assembly.

[0014] In summary, the present invention has the following beneficial effects: 1. This application uses an intelligent dryer to separate each raw material according to the subsequent addition sequence, and then heats and bakes them individually in a stepped manner. First, the temperature is raised to 100℃-120℃, which is conducive to the dissipation of surface moisture, and the treatment is carried out at this temperature for 1-2 hours. Then, the temperature is raised to 145℃-185℃ for further internal dehydration, which also prevents the raw materials from bursting due to the presence of moisture, and the treatment is carried out at this temperature for 2-2.5 hours. Finally, the temperature is raised to 380℃-480℃ and held for 6 hours. The separated stepped drying operation can effectively remove the H, N, and O content from the raw materials, thereby extending the service life of the final product.

[0015] 2. A feed pipe and a side plate are fixedly installed on the trolley. Several intermediate pipes are fixed between the feed pipe and the side plate. The intermediate pipes are set perpendicular to the feed pipe. A material channel with a top opening is opened in the feed pipe. A chamber is opened in the intermediate pipe to connect with the material channel. A through groove is set at the bottom of the chamber to pass through the intermediate pipe. A sliding groove with the same number of intermediate pipes is opened on the side wall of the material channel. A guide plate is slidably installed in each sliding groove. The guide plate is connected to a locking component. After the locking component is released, the guide plate is slid along the guide plate. The guide plate can block the material channel and align it with its corresponding chamber. At this time, raw materials are added into the material channel. The raw materials will flow into the corresponding chamber under the guidance of the guide plate and fall out of the through groove. A loading plate is set at the bottom of each intermediate pipe. A material trough is opened in the loading plate. Each material trough is used to load raw materials with different addition orders. Raw materials with the same addition order are placed in the same material trough for convenient subsequent operation.

[0016] 3. A ventilation slot is opened on one side of each intermediate tube, and the ventilation slot connects to the chamber. The ventilation slot faces one of the No. 1 blower groups. The hot air blown by the No. 1 blower group passes through the chamber through the ventilation slot and is finally discharged from the slot to the raw material in the material tank, so that the raw material in the material tank is heated more fully.

[0017] 4. The inner wall of the chamber should be arc-shaped so that the hot air guided by the inner wall of the chamber will not lose too much power, thus optimizing the drying effect.

[0018] 5. The material trough consists of a raised part and two inclined parts. The raised part is aligned with the through groove and is raised in the middle. The two inclined parts are designed to be angled outward. The raw material falling into the through groove will hit the handle and move to the edge of the material trough under the guidance of one of the inclined parts. This allows the raw material to move to the edge of the material trough first, thus getting closer to the first blower group and obtaining a better drying effect. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a first appearance diagram of an embodiment of this application; Figure 2 This is a second appearance diagram of an embodiment of this application; Figure 3 This is a schematic diagram of a small car; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 yes Figure 3 Side view; Figure 6 yes Figure 5 Enlarged view of point B in the middle; Figure 7 yes Figure 5 The first sectional view; Figure 8 yes Figure 7 Enlarged view of point E in the middle; Figure 9 This is a cross-sectional view of the intermediate tube; Figure 10 yes Figure 5 The second sectional view; Figure 11 yes Figure 10 Enlarged diagram of section H in the middle.

[0021] In the diagram: 11. Base plate; 12. Machine body; 13. No. 1 blower assembly; 14. No. 2 blower assembly; 15. Gate; 16. Trolley; 17. Pulley assembly; 18. Feed pipe; 19. Loading plate; 20. Material trough; 21. Guide rail; 22. Side plate; 23. Intermediate pipe; 24. Guide plate; 25. Handle; 26. Support plate; 27. Insert strip; 28. No. 2 hole; 29. ​​Nut; 30. Ventilation slot; 31. Slot; 32. No. 1 hole; 33. Bolt; 37. Insertion hole; 38. Material channel; 39. Chamber; 40. Slide groove; 42. Through groove; 45. Protrusion; 46. Angled part; 47. Electrical control box. Detailed Implementation

[0022] Example 1: A K418 master alloy smelting process includes the following steps: Step 1: Raw material preparation. Prepare the raw materials according to their respective elements. The raw materials include carbon (C) 0.11%-0.21%, chromium (Cr) 11.2%-14.4%, molybdenum (Mo) 2%-5%, niobium (Nb) 2%-4%, aluminum (Al) 4.9%-6.6%, titanium (Ti) 0.5%-1%, boron (B) 0.005%-0.012%, zirconium (Zr) 0.1%-0.12%, and the remainder is nickel (Ni).

[0023] Step Two: Place the raw materials from Step One into an intelligent industrial dryer. The dryer separates the raw materials according to the order of their addition and heats them individually in a stepped manner. First, heat to 100℃-120℃, which facilitates the dissipation of surface moisture, and process at this temperature for 1-2 hours. Then, heat to 145℃-185℃ for further internal dehydration, which also prevents the raw materials from bursting due to moisture, and process at this temperature for 2-2.5 hours. Finally, heat to 380℃-480℃ and hold for 6 hours. The stepped drying process in Step Two effectively removes the H, N, and O content from the raw materials, thereby extending the service life of the final product.

[0024] Step 3: Place the raw materials in a vacuum induction melting furnace in sequence for melting. The order in which the raw materials are added during the melting process varies. The melting temperature is 1500℃-1600℃, and the melting vacuum degree is 2pa-5pa. Vacuuming is carried out successively by a multi-stage vacuum pump. After complete melting, molten steel is obtained.

[0025] Step 4: Cast the molten steel to obtain the K418 master alloy rod.

[0026] The intelligent industrial dryer used in the above process includes a body 12 and a trolley 16. The body 12 is fixedly mounted on a base plate 11. A drying chamber is provided inside the body 12 to dry the raw materials. The trolley 16 is used to place the raw materials. A guide rail 21 is provided on the base plate 11 at the bottom of the drying chamber. A pulley group 17 is provided at the bottom of the trolley 16. The pulley group 17 matches the guide rail 21 to facilitate the trolley 16 being pulled into or out of the drying chamber. A gate 15 is provided on the top of the body 12. A first blower group 13 and a heating wire are fixedly installed on both sides of the drying chamber, and a second blower group 14 and a heating wire are installed inside the drying chamber. When working, the first blower group 13 and the second blower group 14 are activated to bring the heat of the heating wire to the drying chamber to accelerate drying. A feed pipe 18 and a side plate 22 are fixedly mounted on the trolley 16. Several intermediate pipes 23 are fixed between the feed pipe 18 and the side plate 22. The intermediate pipes 23 are perpendicular to the feed pipe 18. A material channel 38 with a top opening is formed inside the feed pipe 18. A chamber 39 is formed inside the intermediate pipes 23, communicating with the material channel 38. A through groove 42 penetrating the intermediate pipe 23 is formed at the bottom of the chamber 39. A number of sliding grooves 40, matching the number of intermediate pipes 23, are formed on the side wall of the material channel 38. Each sliding groove 40 is slidably mounted with a guide plate 24, which is connected to a locking assembly. After the locking component is released, the guide plate 24 is slid along the guide plate 24. The guide plate 24 can block the material channel 38 and align it with the corresponding chamber 39. At this time, raw materials are added into the material channel 38. Under the guidance of the guide plate 24, the raw materials will flow into the corresponding chamber 39 and fall out of the through groove 42. Each intermediate tube 23 is provided with a loading plate 19 at the bottom. The loading plate 19 has a material groove 20. Each material groove 20 is used to hold raw materials with different addition orders. Raw materials with the same addition order are placed in the same material groove 20 for convenient subsequent operations.

[0027] The locking assembly includes a support plate 26 fixed to the feed pipe 18. A slot 31 is provided in the middle of the support plate 26. A first hole 32 and a second hole 28 are provided on the support plate 26, which pass through the slot 31 and the support plate 26. An insert 27 is fixed at the bottom of the guide plate 24. The insert 27 is inserted into the slot 31. Two insertion holes 37 are provided on the insert 27. A bolt 33 passes through the second hole 28 and the bottom insertion hole 37 to lock the insert 27. The bolt 33 is fitted with a nut 29. To facilitate the movement of the guide plate 24, a handle 25 is fixed to one end of the guide plate 24; To adjust the guide plate 24, unscrew the nut 29, pull out the second hole 28, and move it until the guide plate 24 abuts against the side wall of the material channel 38. At this time, the top insertion hole 37 is aligned with the first hole 32. Insert the second hole 28 into the first hole 32 and tighten the nut 29 to lock it in place.

[0028] An electrical control box 47 is fixedly installed on the machine body 12, and a temperature sensor is installed in the drying chamber to achieve intelligent temperature control in conjunction with the electrical control box 47.

[0029] Example 2: The difference from Embodiment 1 is that a ventilation slot 30 is provided on one side of each of the intermediate tubes 23, and the ventilation slot 30 is connected to the chamber 39; The ventilation slot 30 faces one of the first blower groups 13. The hot air blown out by the first blower group 13 passes through the ventilation slot 30, through the chamber 39, and finally exits from the channel 42 to the raw material in the material tank 20, so that the raw material in the material tank 20 is heated more fully. It should be noted that the inner wall of the chamber 39 is arc-shaped so that the hot air guided by the inner wall of the chamber 39 will not lose too much power, thus optimizing the drying effect.

[0030] Example 3: See Figure 9 The difference from Embodiment 1 is that the through groove 42 is designed from small to large, with the end closest to the second blower assembly 14 being the largest and the end closest to the feed pipe 18 being the smallest. The raw materials entering the chamber 39 will fall at different positions in the channel 42 due to their different sizes. The larger the raw materials, the closer they are to the second blower group 14. The advantage of this design is that the raw materials can be arranged in the material tank 20 from small to large under the action of the channel 42. The larger the raw materials, the closer they are to the second blower group 14. The raw materials that are closer to the second blower group 14 can get a better drying effect, so that the raw materials in the entire material tank 20 can get a basically uniform drying effect.

[0031] Example 4: See Figure 11 The difference from the embodiment is that the material trough 20 is composed of a protrusion 45 and two inclined surfaces 46. The protrusion 45 is aligned with the through groove 42 and the protrusion 45 is raised in the middle. The two inclined surfaces 46 are designed to be angled outward. The raw material falling into the through groove 42 will hit the protrusion 45 and move to the edge of the material trough 20 under the guidance of one of the inclined surfaces 46. This makes the raw material move to the edge of the material trough 20 first, thus getting closer to the first blower assembly 13 and obtaining a better drying effect.

[0032] The method of using the intelligent industrial dryer in this application is as follows: First, based on the K418 master alloy smelting process, determine the batches of various raw materials to be added. Adjust the number of guide plates 24 blocking the material channel 38 according to the batches. The adjustment method is as follows: unscrew the nut 29, pull out the second hole 28, move it until the guide plate 24 abuts against the side wall of the material channel 38, at which point the top insertion hole 37 is aligned with the first hole 32. Insert the second hole 28 into the first hole 32 and tighten the nut 29 to lock it in place. After completion, the first batch of raw materials is added from the top of the material channel 38. After the raw materials are added, they flow along the material channel 38 to the guide plate 24. Under the guidance of the guide plate 24, they flow into the corresponding chamber 39 and fall from the through groove 42 into the material trough 20. The raw materials entering the chamber 39 will fall at different positions in the through groove 42 due to their different sizes. The larger the raw materials, the closer they are to the second blower assembly 14. The raw material falling into the channel 42 will hit the handle 25 and move to the edge of the trough 20 under the guidance of one of the inclined surfaces 46; After the first batch of raw materials is added, unscrew the nut 29, pull out the second hole 28, move the guide plate 24 back to its original position, and lock it again with the second hole 28. The next batch of raw materials can be added, and the operation can be repeated until all raw materials are added. Different batches of raw materials will be spread on different loading plates 19. After the raw materials are added, the trolley 16 is pushed into the drying chamber, and the heating wire, the first blower group 13 and the second blower group 14 are started to dry the raw materials. The hot air blown out by the first blower group 13 will pass through the ventilation channel 30, the chamber 39 and finally be discharged from the channel 42 to the raw materials in the material tank 20.

[0033] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand and implement the present invention. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An intelligent industrial dryer, comprising a body (12) and a trolley (16), wherein the body (12) is fixedly mounted on a base plate (11), a drying chamber is provided inside the body (12) for drying raw materials, a guide rail (21) is provided on the base plate (11) at the bottom of the drying chamber, and a pulley group (17) is provided at the bottom of the trolley (16), characterized in that: A first blower assembly (13) and a heating wire are fixedly installed on both sides of the drying chamber, and a second blower assembly (14) and a heating wire are installed inside the drying chamber. A feed pipe (18) and a side plate (22) are fixedly installed on the trolley (16). Several intermediate pipes (23) are fixed between the feed pipe (18) and the side plate (22). The intermediate pipes (23) are perpendicular to the feed pipe (18). A material channel (38) with a top opening is opened in the feed pipe (18). A chamber (39) is opened in the intermediate pipe (23) to connect with the material channel (38). A through groove (42) penetrating the intermediate pipe (23) is provided at the bottom of the chamber (39). A sliding groove (40) with the same number as the intermediate pipes (23) is opened on the side wall of the material channel (38). Each sliding groove (40) is slidably provided with a guide. Material plate (24), the guide plate (24) is connected to the locking component. After the locking component is released, the guide plate (24) is slid along the guide plate (24). The guide plate (24) can block the material channel (38) and align it with the corresponding chamber (39). At this time, raw materials are added into the material channel (38). The raw materials will flow into the corresponding chamber (39) under the guidance of the guide plate (24) and fall from the through groove (42). Each intermediate tube (23) is provided with a loading plate (19) at the bottom. The loading plate (19) has a material groove (20) in it. Each material groove (20) is used to load raw materials with different addition sequences.

2. The lifting platform for a pickup truck living compartment according to claim 1, characterized in that: The locking assembly includes a support plate (26) fixed on the feed tube (18), a slot (31) is provided in the middle of the support plate (26), and a first hole (32) and a second hole (28) are provided on the support plate (26) that pass through the slot (31) and the support plate (26). An insert (27) is fixed at the bottom of the guide plate (24), and the insert (27) is inserted into the slot (31). Two insertion holes (37) are provided on the insert (27), and a bolt (33) passes through the second hole (28) and the bottom insertion hole (37) to lock the insert (27). The bolt (33) is fitted with a nut (29).

3. The lifting platform for a pickup truck living compartment according to claim 2, characterized in that: An electrical control box (47) is fixedly installed on the machine body (12), and a temperature sensor is installed in the drying chamber.

4. A lifting platform for a pickup truck living compartment according to claim 3, characterized in that: A ventilation slot (30) is provided on one side of each of the intermediate tubes (23), the ventilation slot (30) is connected to the chamber (39), and the ventilation slot (30) is oriented toward one of the first blower groups (13).

5. A lifting platform for a pickup truck living compartment according to claim 4, characterized in that: The through groove (42) is designed from small to large, with the end closest to the second blower assembly (14) being the largest and the end closest to the feed pipe (18) being the smallest. The raw materials entering the chamber (39) will fall into different positions in the through groove (42) due to their different sizes, and the larger the raw materials are, the closer they are to the second blower assembly (14).

6. A lifting platform for a pickup truck living compartment according to claim 5, characterized in that: The feed trough (20) consists of a protrusion (45) and two inclined surfaces (46). The protrusion (45) is aligned with the through groove (42). The protrusion (45) is raised in the middle. The two inclined surfaces (46) are designed to be angled outward. The raw material falling into the through groove (42) will hit the protrusion (45) and move to the edge of the feed trough (20) under the guidance of one of the inclined surfaces (46). This makes the raw material move to the edge of the feed trough (20) first, thus getting closer to the first blower assembly (13).

7. A K418 master alloy smelting process, based on the intelligent industrial dryer described in claim 1, characterized in that: Includes the following steps: Step 1: Raw material preparation. Prepare the raw materials according to their elemental composition. The raw materials include carbon (C) 0.11%-0.21%, chromium (Cr) 11.2%-14.4%, molybdenum (Mo) 2%-5%, niobium (Nb) 2%-4%, aluminum (Al) 4.9%-6.6%, titanium (Ti) 0.5%-1%, boron (B) 0.005%-0.012%, zirconium (Zr) 0.1%-0.12%, and the remainder is nickel (Ni). Step 2: Place the raw materials from Step 1 into the intelligent industrial dryer. The intelligent dryer will separate the raw materials according to the order of subsequent additions and heat and bake them individually in a stepped manner: first, heat to 100℃-120℃ and treat at this temperature for 1-2 hours; then heat to 145℃-185℃ and treat at this temperature for 2-2.5 hours; then heat to 380℃-480℃ and hold for 6 hours. Step 3: Place the raw materials in a vacuum induction melting furnace in sequence for melting. The order in which the raw materials are added during the melting process varies. The melting temperature is 1500℃-1600℃, and the melting vacuum degree is 2pa-5pa. After complete melting, molten steel is obtained. Step 4: Cast the molten steel to obtain the K418 master alloy rod.

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