Smelting production process of a kind of ship air valve steel 20Cr21Ni12N

Abstract

The invention discloses a smelting production process of a ship air valve steel 20Cr21Ni12N. The smelting production process steps of the ship air valve steel 20Cr21Ni12N are as follows: Step 1, first rotate the sealing cover counterclockwise. After opening the sealing cover, put graphite, metallic iron, metallic chromium, metallic nickel and manganese nitride metal into the crucible capacitor furnace according to the proportion, and then start the vacuum pump to evacuate the inside of the crucible capacitor furnace to a vacuum state. Start the crucible capacitor furnace and melt at 1460° to 1520° for 20 minutes. Step 2, start the water pump to input a small amount of water into the crucible capacitor furnace for rapid cooling. Open the sealing cover and use a stirring rod to stir the molten mixed metal liquid. Continue to put a certain proportion of graphite, metallic iron, metallic chromium, metallic nickel and manganese nitride metal, and then close the sealing cover. Connect the inert gas outlet to the third connecting pipe, and charge the crucible capacitor furnace with inert gas and start the crucible capacitor furnace to melt for 20 minutes. Step 3, open the sealing cover, use a stirring rod to stir, and pour the molten metal liquid into the mold for solution treatment.

Description

Technical Field

[0001] The present invention relates to the field of metal material manufacturing processes, and particularly to a smelting production process for ship air valve steel 20Cr21Ni12N. Background Art

[0002] Air valve steel refers to the steel type suitable for manufacturing various valves. It is the essential material for manufacturing the intake and exhaust valves of gasoline engines and diesel engines, and is also the key material in the entire engine. Due to the high temperature caused by gas combustion in the cylinder, and the strong corrosion of impurities such as S and P in gasoline to the material at high temperatures, air valve steel needs to have good high-temperature corrosion resistance.

[0003] The existing smelting cycle of ship air valve steel is long, the smelting device is large in volume, and the smelting efficiency is low. Therefore, a smelting production process for ship air valve steel 20Cr21Ni12N is needed. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a smelting production process for ship air valve steel 20Cr21Ni12N, which solves the problems of the long smelting cycle, large volume of the smelting device, and low smelting efficiency of the existing ship air valve steel, and thus a smelting production process for ship air valve steel 20Cr21Ni12N is needed.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] A smelting production process for ship air valve steel 20Cr21Ni12N, and the steps of the smelting production process for ship air valve steel 20Cr21Ni12N are as follows:

[0007] Step 1: First, rotate the sealing cover counterclockwise. After opening the sealing cover, put graphite, metallic iron, metallic chromium, metallic nickel, and manganese nitride metal into the crucible capacitor furnace according to the proportion, and then start the vacuum pump to evacuate the inside of the crucible capacitor furnace to a vacuum state. Start the crucible capacitor furnace and melt at 1460° to 1520° for 20 minutes.

[0008] Step 2: Start the water pump to input a small amount of water into the crucible capacitor furnace for rapid cooling. Open the sealing cover and use a stirring rod to stir the molten mixed metal liquid. Then put a certain proportion of graphite, metallic iron, metallic chromium, metallic nickel, and manganese nitride metal again, close the sealing cover, connect the inert gas outlet to the third connecting pipe, and fill the crucible capacitor furnace with inert gas while starting the crucible capacitor furnace to melt for 20 minutes.

[0009] Step 3: Open the sealing cover, use a stirring rod to stir, and pour the molten metal liquid into the mold for solution treatment.

[0010] The above technical object of the present invention is achieved by the following technical solutions:

[0011] A smelting production process for a ship air valve steel 20Cr21Ni12N adopts the following technical solutions. In step one, the sealing cover is threadedly connected to the crucible capacitor furnace. The bottom end of the crucible capacitor furnace is fixedly installed with a support plate. The top surface of the support plate is provided with a vacuum pump. The top surface of the support plate is fixedly installed with a water tank. The top surface of the water tank is fixedly installed with a water pump. The top surface of the support plate is provided with a stirring rod. The top surface of the sealing cover is fixedly installed with a third connecting pipe.

[0012] By adopting the above technical solutions, by setting a vacuum pump, after putting graphite, metallic iron, metallic chromium, metallic nickel and manganese nitride metal into the crucible capacitor furnace according to the ratio, the vacuum pump is started, and the vacuum pump pumps the air inside the crucible capacitor furnace to a vacuum state.

[0013] Preferably, the top surface of the sealing cover is fixedly installed with a first connecting pipe. The first connecting pipe is communicated with the bottom surface of the sealing cover. One end of the first connecting pipe is provided with an air extraction pipe. The air extraction port of the vacuum pump is fixedly installed with one end of the air extraction pipe. The top surface of the sealing cover is fixedly installed with a second connecting pipe. The second connecting pipe is communicated with the bottom surface of the sealing cover. The top surface of the second connecting pipe is provided with a water outlet pipe. One end of the water outlet of the water pump is fixedly installed with the end of the water outlet pipe far away from the second connecting pipe. The water extraction port of the water pump is fixedly installed with a water extraction pipe. One end of the water extraction pipe far away from the water pump is fixedly installed with the top surface of the water tank. One end of the water extraction pipe extends to the inner bottom surface of the water tank.

[0014] By adopting the above technical solutions, by setting a vacuum pump, after putting graphite, metallic iron, metallic chromium, metallic nickel and manganese nitride metal into the crucible capacitor furnace according to the ratio, the vacuum pump is started, and the vacuum pump pumps the air inside the crucible capacitor furnace to a vacuum state. Then the crucible capacitor furnace is started to start smelting. After the smelting is completed, the water pump is started. The water pump extracts a small amount of water from the water tank, so that the temperature inside the crucible capacitor furnace drops rapidly. The sealing cover is opened and graphite, metallic iron, metallic chromium, metallic nickel and manganese nitride metal are added again and the air is evacuated for smelting. Inert gas is injected into the third connecting pipe during this smelting process, and then the smelting can be completed.

[0015] Preferably, two rotating handles are fixedly installed on the top surface of the sealing cover.

[0016] By adopting the above technical solutions, by setting rotating handles, the staff can more conveniently open the sealing cover through the rotating handles.

[0017] Preferably, a first air valve is arranged on the outer circumferential wall surface of the first connecting pipe, a water valve is arranged on the outer circumferential wall surface of the second connecting pipe, and a second air valve is arranged on the outer circumferential wall surface of the third connecting pipe.

[0018] By adopting the above technical solution, by setting the first air valve, water valve and second air valve, the first air valve, water valve and second air valve can be closed when the first connecting pipe, second connecting pipe and third connecting pipe are not applicable, thereby ensuring the airtightness of the crucible capacitor furnace.

[0019] Preferably, a limiting ring is fixedly sleeved on the outer circumferential wall surface of the sealing cover, a sealing ring is fixedly installed on the top surface of the crucible capacitor furnace, and the limiting ring is in close fit with the sealing ring.

[0020] By adopting the above technical solution, by setting the sealing ring, the airtightness of the crucible capacitor furnace when refining gas valve steel can be ensured through the sealing ring.

[0021] Preferably, one end of the exhaust pipe is provided with a tracheal connector, the exhaust pipe is connected to the first connecting pipe through the tracheal connector, one end of the water outlet pipe is provided with a water pipe connector, and the water outlet pipe is connected to the second connecting pipe through the water pipe connector.

[0022] By adopting the above technical solution, by setting the tracheal connector and the water pipe connector, when the staff needs to open the sealing cover, the exhaust pipe and the water outlet pipe can be disassembled through the tracheal connector and the water pipe connector, which is convenient for opening the sealing cover.

[0023] Preferably, a placing block is fixedly installed on the top surface of the support plate, a cooling groove is opened on the inner bottom surface of the placing block, water is arranged inside the cooling groove, the stirring rod is movably sleeved inside the cooling groove, a heat insulation block is fixedly sleeved on the outer circumferential wall surface of the stirring rod, a liquid outlet hole is opened on one side of the placing block, the liquid outlet hole is communicated with the cooling groove, and a piston is movably sleeved inside the liquid outlet hole.

[0024] By adopting the above technical solution, by setting the stirring rod, the stirring rod can stir the mixed liquid after the first smelting to make the material fusion more sufficient.

[0025] Preferably, a first rotating block is fixedly installed on the top surface of the support plate, a rotating groove is opened on the top surface of the first rotating block, a bearing is movably sleeved inside the rotating groove, a connecting column is fixedly sleeved on the inner circumferential wall surface of the inner ring of the bearing, a second rotating block is fixedly installed on the top surface of the connecting column, and the bottom surface of the vacuum pump is fixedly installed on the top surface of the second rotating block.

[0026] By adopting the above technical solution, by setting the connecting column, and the connecting column is fixedly sleeved on the inner circumferential wall surface of the inner ring of the bearing, so that the vacuum pump can rotate, and after the staff disassembles the tracheal connector, the exhaust pipe can be rotated to one side to prevent it from affecting the staff to add materials.

[0027] In summary, the present invention mainly has the following beneficial effects:

[0028] By setting a vacuum pump, after putting graphite, metallic iron, metallic chromium, metallic nickel, and metallic manganese nitride into the crucible capacitor furnace according to the ratio, the vacuum pump is started. The vacuum pump evacuates the air inside the crucible capacitor furnace to a vacuum state, and then the crucible capacitor furnace is started for melting. After the melting is completed, the water pump is started. The water pump extracts a small amount of water from the water tank, causing the temperature inside the crucible capacitor furnace to drop rapidly. The sealing cover is opened, and graphite, metallic iron, metallic chromium, metallic nickel, and metallic manganese nitride are added again, and then the air is evacuated for melting. During this melting process, an inert gas is injected into the third connecting pipe, and then the melting can be completed. The smelting process is simple, the smelting cycle is short, the device volume is small, and the smelting efficiency is high.

[0029] By setting a rotating handle, the rotating handle enables the staff to more conveniently open the sealing cover. By setting a first air valve, a water valve, and a second air valve, the first air valve, the water valve, and the second air valve can be closed when the first connecting pipe, the second connecting pipe, and the third connecting pipe are not in use, thereby ensuring the airtightness of the crucible capacitor furnace.

[0030] By setting an air pipe connector and a water pipe connector, when the staff needs to open the sealing cover, the air extraction pipe and the water outlet pipe can be disassembled through the air pipe connector and the water pipe connector, which is convenient for opening the sealing cover. By setting a stirring rod, the stirring rod can stir the mixed liquid after the first melting to make the materials blend more fully. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a process flow schematic diagram of the present invention;

[0032] Figure 2 is a three-dimensional structure schematic diagram of the present invention;

[0033] Figure 3 is a split structure schematic diagram of the present invention;

[0034] Figure 4 is a rotating handle structure schematic diagram of the present invention;

[0035] Figure 5 is a limiting ring structure schematic diagram of the present invention;

[0036] Figure 6 is a placing block structure schematic diagram of the present invention;

[0037] Figure 7 is a stirring rod structure schematic diagram of the present invention;

[0038] Figure 8 is a connecting column structure schematic diagram of the present invention.

[0039] Reference numerals: 1, support plate; 2, crucible capacitance furnace; 3, sealing cover; 4, first connecting pipe; 5, air extraction pipe; 6, vacuum pump; 7, second connecting pipe; 8, water outlet pipe; 9, water tank; 10, water pump; 11, water extraction pipe; 12, third connecting pipe; 13, rotary handle; 14, first air valve; 15, water valve; 16, second air valve; 17, limit ring; 18, sealing ring; 19, air pipe connector; 20, water pipe connector; 21, placing block; 22, cooling tank; 23, stirring rod; 24, heat insulation block; 25, liquid outlet hole; 26, piston; 27, first rotating block; 28, rotating groove; 29, bearing; 30, connecting column; 31, second rotating block. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Embodiment 1

[0042] Reference Figures 1 - 8 , a smelting production process of ship air valve steel 20Cr21Ni12N, and the steps of the smelting production process of ship air valve steel 20Cr21Ni12N are as follows:

[0043] Step 1: First, rotate the sealing cover 3 counterclockwise. After opening the sealing cover 3, put graphite, metallic iron, metallic chromium, metallic nickel, and nitrided metallic manganese into the crucible capacitance furnace 2 according to a ratio, and then start the vacuum pump 6 to evacuate the inside of the crucible capacitance furnace 2 to a vacuum state. Start the crucible capacitance furnace 2 and melt at 1460° to 1520° for 20 min.

[0044] Step 2: Start the water pump 10 to input a small amount of water into the crucible capacitance furnace 2 for rapid cooling. Open the sealing cover 3 and use the stirring rod 23 to stir the molten mixed metal liquid. Then continue to put a certain proportion of graphite, metallic iron, metallic chromium, metallic nickel, and nitrided metallic manganese, and then close the sealing cover 3. Connect the inert gas outlet to the third connecting pipe 12, and fill the crucible capacitance furnace 2 with inert gas and start the crucible capacitance furnace 2 to melt for 20 min.

[0045] Step 3: Open the sealing cover 3, use the stirring rod 23 to stir, and pour the molten metal liquid into the mold for solution treatment.

[0046] Embodiment 2

[0047] The above technical objectives of the present invention are achieved through the following technical solutions:

[0048] Reference Figure 1 、 Figure 2 、 Figure 3 and Figure 4 ,the present invention also provides a smelting production process for a ship air valve steel 20Cr21Ni12N, adopting the following technical solutions. In step one, the sealing cover 3 is threadedly connected to the crucible capacitor furnace 2. The crucible capacitor furnace 2 is a known structure and will not be described in detail here. A support plate 1 is fixedly installed at the bottom end of the crucible capacitor furnace 2. A vacuum pump 6 is arranged on the top surface of the support plate 1. The vacuum pump 6 is a known structure and will not be described in detail here. A water tank 9 is fixedly installed on the top surface of the support plate 1. The water tank 9 is a known structure and will not be described in detail here. A water pump 10 is fixedly installed on the top surface of the water tank 9. The water pump 10 is a known structure and will not be described in detail here. A stirring rod 23 is arranged on the top surface of the support plate 1. A third connecting pipe 12 is fixedly installed on the top surface of the sealing cover 3. A first connecting pipe 4 is fixedly installed on the top surface of the sealing cover 3. The first connecting pipe 4 communicates with the bottom surface of the sealing cover 3. One end of the first connecting pipe 4 is provided with an air extraction pipe 5. The air extraction port of the vacuum pump 6 is fixedly installed with one end of the air extraction pipe 5. A second connecting pipe 7 is fixedly installed on the top surface of the sealing cover 3. The second connecting pipe 7 communicates with the bottom surface of the sealing cover 3. A water outlet pipe 8 is arranged on the top surface of the second connecting pipe 7. One end of the water outlet of the water pump 10 is fixedly installed with the end of the water outlet pipe 8 away from the second connecting pipe 7. The water suction port of the water pump 10 is fixedly installed with a water suction pipe 11. One end of the water suction pipe 11 away from the water pump 10 is fixedly installed on the top surface of the water tank 9. One end of the water suction pipe 11 extends to the inner bottom surface of the water tank 9.

[0049] Example Three

[0050] Reference Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 and Figure 7 ,two rotating handles 13 are fixedly installed on the top surface of the sealing cover 3. A first air valve 14 is arranged on the outer circumferential wall surface of the first connecting pipe 4. The first air valve 14 is a known structure and will not be described in detail here. A water valve 15 is arranged on the outer circumferential wall surface of the second connecting pipe 7. A second air valve 16 is arranged on the outer circumferential wall surface of the third connecting pipe 12. The second air valve 16 is a known structure and will not be described in detail here. A limiting ring 17 is fixedly sleeved on the outer circumferential wall surface of the sealing cover 3. A sealing ring 18 is fixedly installed on the top surface of the crucible capacitor furnace 2. The sealing ring 18 is a known structure and will not be described in detail here. The limiting ring 17 is in close fit with the sealing ring 18. One end of the air extraction pipe 5 is provided with an air pipe connector 19. The air extraction pipe 5 is connected to the first connecting pipe 4 through the air pipe connector 19. One end of the water outlet pipe 8 is provided with a water pipe connector 20. The water outlet pipe 8 is connected to the second connecting pipe 7 through the water pipe connector 20.

[0051] Example Four

[0052] Reference Figure 3 、Figure 4 , Figure 5 , Figure 6 and Figure 7 , a placing block 21 is fixedly installed on the top surface of the support plate 1. A cooling groove 22 is formed in the inner bottom surface of the placing block 21. Water is arranged inside the cooling groove 22. A stirring rod 23 is movably sleeved inside the cooling groove 22. A heat insulation block 24 is fixedly sleeved on the outer circumferential wall surface of the stirring rod 23. A liquid outlet hole 25 is formed in one side of the placing block 21. The liquid outlet hole 25 communicates with the cooling groove 22. A piston 26 is movably sleeved inside the liquid outlet hole 25. The piston 26 is a known structure and will not be described in detail here. A first rotating block 27 is fixedly installed on the top surface of the support plate 1. A rotating groove 28 is formed in the top surface of the first rotating block 27. A bearing 29 is movably sleeved inside the rotating groove 28. The bearing 29 is a known structure and will not be described in detail here. A connecting column 30 is sleeved on the inner circumferential wall surface of the inner ring of the bearing 29. A second rotating block 31 is fixedly installed on the top surface of the connecting column 30. The bottom surface of the vacuum pump 6 is fixedly installed on the top surface of the second rotating block 31.

[0053] Working principle: Please refer to Figures 1 - 7 As shown. During use, by setting the rotating handle 13, pressing the rotating handle 13 and rotating the sealing cover 3 counterclockwise, putting graphite, metallic iron, metallic chromium, metallic nickel and manganese nitride into the crucible capacitor furnace 2 in proportion, then opening the first air valve 14 and starting the vacuum pump 6 to pump the inside of the crucible capacitor furnace 2 to a vacuum state, starting the crucible capacitor furnace 2 and melting for 20 min at 1460° to 1520°, opening the water valve 15, starting the water pump 10 to input a small amount of water into the crucible capacitor furnace 2 for rapid cooling, opening the sealing cover 3 and using the stirring rod 23 to stir the molten mixed metal liquid, continuing to put a certain proportion of graphite, metallic iron, metallic chromium, metallic nickel and manganese nitride, then closing the sealing cover 3, connecting the inert gas outlet to the third communicating pipe 12, opening the second air valve 16 to fill the crucible capacitor furnace 2 with inert gas and starting the crucible capacitor furnace 2 to melt for 20 min, opening the sealing cover 3, using the stirring rod 23 to stir, and pouring the molten metal liquid into a mold for solidification.

[0054] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A smelting production process for a ship air valve steel 20Cr21Ni12N, characterized in that, The specific smelting production process steps of a marine air valve steel 20Cr21Ni12N smelting production process are as follows: Step 1: First, rotate the sealing cover (3) counterclockwise. After opening the sealing cover (3), put graphite, metallic iron, metallic chromium, metallic nickel, and nitrided metallic manganese into the crucible capacitance furnace (2) according to the proportion, then start the vacuum pump (6) to evacuate the inside of the crucible capacitance furnace (2) to a vacuum state, and start the crucible capacitance furnace (2) to melt for 20 minutes at 1460° to 1520°; Step 2: Start the water pump (10) to input a small amount of water into the crucible capacitance furnace (2) for rapid cooling. Open the sealing cover (3) and use the stirring rod (23) to stir the molten mixed metal liquid. Then continue to put a certain proportion of graphite, metallic iron, metallic chromium, metallic nickel, and nitrided metallic manganese, and then close the sealing cover (3). Connect the inert gas outlet to the third connecting pipe (12), and fill the crucible capacitance furnace (2) with inert gas while starting the crucible capacitance furnace (2) to melt for 20 minutes; Step 3: Open the sealing cover (3), use the stirring rod (23) to stir, and pour the molten metal liquid into the mold for solution treatment; In Step 1, the sealing cover (3) is threadedly connected to the crucible capacitance furnace (2). The bottom end of the crucible capacitance furnace (2) is fixedly installed with a support plate (1). The top surface of the support plate (1) is provided with a vacuum pump (6). The top surface of the support plate (1) is fixedly installed with a water tank (9). The top surface of the water tank (9) is fixedly installed with a water pump (10). The top surface of the support plate (1) is provided with a stirring rod (23). The top surface of the sealing cover (3) is fixedly installed with a third connecting pipe (12); The top surface of the sealing cover (3) is fixedly installed with a first connecting pipe (4). The first connecting pipe (4) communicates with the bottom surface of the sealing cover (3). One end of the first connecting pipe (4) is provided with an air extraction pipe (5). The air extraction port of the vacuum pump (6) is fixedly installed with one end of the air extraction pipe (5). The top surface of the sealing cover (3) is fixedly installed with a second connecting pipe (7). The second connecting pipe (7) communicates with the bottom surface of the sealing cover (3). The top surface of the second connecting pipe (7) is provided with a water outlet pipe (8). One end of the water outlet of the water pump (10) is fixedly installed with the end of the water outlet pipe (8) far from the second connecting pipe (7). The water suction port of the water pump (10) is fixedly installed with a water suction pipe (11). One end of the water suction pipe (11) far from the water pump (10) is fixedly installed with the top surface of the water tank (9). One end of the water suction pipe (11) extends to the inner bottom surface of the water tank (9).

2. The smelting and production process of a marine air valve steel 20Cr21Ni12N according to claim 1, characterized in that, Two rotating handles (13) are fixedly installed on the top surface of the sealing cover (3).

3. A smelting and production process of a marine gas valve steel 20Cr21Ni12N according to claim 2, characterized in that, A first air valve (14) is arranged on the outer circumferential wall surface of the first connecting pipe (4). A water valve (15) is arranged on the outer circumferential wall surface of the second connecting pipe (7). A second air valve (16) is arranged on the outer circumferential wall surface of the third connecting pipe (12).

4. A smelting and production process of a marine air valve steel 20Cr21Ni12N according to claim 3, characterized in that, A limiting ring (17) is fixedly sleeved on the outer circumferential wall surface of the sealing cover (3), a sealing ring (18) is fixedly installed on the top surface of the crucible capacitor furnace (2), and the limiting ring (17) is in close fit with the sealing ring (18).

5. A smelting and production process for a marine gas valve steel 20Cr21Ni12N according to claim 1, characterized in that, One end of the air extraction pipe (5) is provided with an air pipe connector (19), the air extraction pipe (5) is connected to the first communication pipe (4) through the air pipe connector (19), one end of the water outlet pipe (8) is provided with a water pipe connector (20), and the water outlet pipe (8) is connected to the second communication pipe (7) through the water pipe connector (20).

6. The smelting and production process of a marine valve steel 20Cr21Ni12N according to claim 1, characterized in that, A placing block (21) is fixedly installed on the top surface of the support plate (1). A cooling groove (22) is formed in the inner bottom surface of the placing block (21). Water is arranged inside the cooling groove (22). The stirring rod (23) is movably sleeved inside the cooling groove (22). A heat insulation block (24) is fixedly sleeved on the outer circumferential wall surface of the stirring rod (23). A liquid outlet hole (25) is formed in one side of the placing block (21). The liquid outlet hole (25) is communicated with the cooling groove (22). A piston (26) is movably sleeved inside the liquid outlet hole (25).

7. A smelting and production process for a marine gas valve steel 20Cr21Ni12N according to claim 1, characterized in that, A first rotating block (27) is fixedly installed on the top surface of the support plate (1). A rotating groove (28) is formed in the top surface of the first rotating block (27). A bearing (29) is movably sleeved inside the rotating groove (28). A connecting column (30) is sleeved on the inner circumferential wall surface of the inner ring of the bearing (29). A second rotating block (31) is fixedly installed on the top surface of the connecting column (30). The bottom surface of the vacuum pump (6) is fixedly installed on the top surface of the second rotating block (31).

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