A ferrous metallurgical and calendered product production process

Abstract

The application relates to the technical field of ferrous metal manufacturing, in particular to a ferrous metal smelting and rolling production process. The ferrous metal smelting and rolling production process comprises the following steps: pickling, first annealing, first rolling, second annealing, second rolling, third annealing and finishing; wherein the cooling operation of the first annealing, the second annealing and the third annealing is that the steel belt is cooled to 500-600 DEG C with the furnace, then the steel belt is cooled to 250-350 DEG C through air cooling, then the steel belt is cooled to 120-160 DEG C through mixed cooling, and finally the steel belt is cooled to 50-80 DEG C through water cooling and is discharged from the furnace; the mixed cooling is carried out synchronously through air cooling and water cooling. The ferrous metal smelting and rolling production process has the advantages of reducing the possibility of fracture of the steel belt during winding.

Description

Technical Field

[0001] This application relates to the technical field of ferrous metal manufacturing, and more specifically, to a process for producing ferrous metal smelting and rolling products. Background Technology

[0002] Metals are substances that possess luster and good electrical and thermal conductivity, as well as mechanical properties. Metals are mainly divided into two categories: ferrous metals and non-ferrous metals. Ferrous metals primarily refer to iron and its alloys, such as steel, pig iron, ferroalloys, and cast iron, while metals other than ferrous metals are collectively referred to as non-ferrous metals.

[0003] Steel strip is a common ferrous metal rolled product, and the traditional cold rolling process of steel strip mainly includes the following steps: pickling, first annealing, first rolling, second annealing, second rolling, third annealing, finishing, and finished product warehousing. Among them, the annealing process and the cooling process after annealing are the key steps that determine the toughness of steel strip.

[0004] For low-carbon, nitrogen-ferritic stainless steel, the small interfacial spaces between octahedrons make it easy for harmful second phases to precipitate during slow cooling, resulting in the formation of strengthening phases and thus reducing the toughness of the stainless steel. Prolonged exposure to 475°C can also lead to a decrease in toughness. Furthermore, the internal stress caused by rapid cooling during mass production can also reduce the toughness of stainless steel, and all of these reductions in toughness can lead to localized breakage during strip winding. Summary of the Invention

[0005] In order to improve the defect that local breakage easily occurs when steel strip is coiled, this application provides a production process for ferrous metal smelting and rolling products.

[0006] This application provides a process for producing rolled ferrous metal products, which adopts the following technical solution:

[0007] A process for producing rolled ferrous metal products includes the following steps:

[0008] Pickling: The steel strip is straightened, then pickled, washed and dried in sequence, and finally coiled to obtain a steel coil.

[0009] First annealing: The steel coil is loaded into the annealing furnace, and then a protective gas is introduced. The furnace temperature is then raised to 680-720℃ at a heating rate of 40-50℃ / h, and the steel strip is held at this temperature for 10-14 hours. After the holding period, the steel strip is cooled in the furnace to 500-600℃, then cooled to 250-350℃ by air cooling, then cooled to 120-160℃ by mixed cooling, and finally cooled to 50-80℃ by water cooling before being removed from the furnace, thus obtaining a first-annealed steel coil.

[0010] The hybrid cooling system involves simultaneous air cooling and water cooling.

[0011] First rolling: The annealed steel coil is rolled in five passes with thicknesses of 2.52mm, 2.3mm, 1.9mm, 1.75mm, 1.50mm and 1.42mm respectively, and finally coiled to obtain a first rolled steel coil.

[0012] Second annealing: The primary rolled steel coil is loaded into the annealing furnace, and then a protective gas is introduced. The furnace temperature is then raised to 720-760℃ at a heating rate of 40-50℃ / h, and the steel coil is held at this temperature for 6-8 hours. After that, the temperature is lowered to 680-720℃ at a cooling rate of 15-25℃ / h, and held for 4-6 hours. After the holding period, the steel coil is cooled in the furnace to 500-600℃, then cooled to 250-350℃ by air cooling, then cooled to 120-160℃ by mixed cooling, and finally cooled to 50-80℃ by water cooling before being removed from the furnace, thus obtaining a secondary annealed steel coil.

[0013] Second rolling: The annealed steel coil is rolled in five passes with thicknesses of 1.42mm, 1.25mm, 0.9mm, 0.7mm, 0.55mm and 0.5mm respectively, and finally coiled to obtain the second rolled steel coil.

[0014] Third annealing: The secondary rolled steel coil is loaded into the annealing furnace, and then a protective gas is introduced. The furnace temperature is then raised to 680-720℃ at a heating rate of 40-50℃ / h, and the steel coil is held at this temperature for 10-14h. The steel coil is then cooled in the furnace to 500-600℃, then cooled to 250-350℃ by air cooling, then cooled to 120-160℃ by mixed cooling, and finally cooled to 50-80℃ by water cooling before being removed from the furnace, thus obtaining a tertiary annealed steel coil.

[0015] Finishing: The 3-times annealed steel coils are oiled, pressure-flattened, and trimmed before being finally coiled and stored.

[0016] By adopting the above technical solution, in the cooling operation after annealing, compared with air cooling, water cooling or air cooling and water cooling in sequence, the method of air cooling, mixed cooling and water cooling can effectively control the steady drop of steel strip temperature, thereby promoting the steel strip to obtain better microstructure and internal stress matching, and effectively reducing the possibility of local breakage when the steel strip is coiled.

[0017] Preferably, in the finishing process, the oil used for the oiling operation is a smoothing and rust-preventive oil;

[0018] The smoothing and rust-preventive oil comprises the following raw materials in parts by weight: 350-450 parts trimethylolpropane oleate, 250-350 parts rust inhibitor, 10-30 parts polyethylene glycol monohexadecyl ether, 500-600 parts castor oil base oil, and 10-30 parts polyisobutylene.

[0019] The smoothing and rust-preventing oil is a mixture of barium dinonylnaphthalenesulfonate, dodecenyl succinate monoester, and O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate.

[0020] By adopting the above technical solution, the leveling agent used in traditional steel strip leveling is often water or a water-based leveling agent. However, such leveling agents have defects such as insufficient lubrication, strip breakage, and watermarks remaining on the steel plate when leveling steel strips. The leveling and rust-inhibiting agent of this application has excellent lubrication properties, which can effectively reduce the possibility of strip breakage during steel strip leveling and winding.

[0021] Furthermore, compared to using barium dinonylnaphthalenesulfonate, dodecenyl succinate, or O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate alone, the steel strip will exhibit superior rust prevention performance when the leveling rust inhibitor of this application is a mixture of barium dinonylnaphthalenesulfonate, dodecenyl succinate, and O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate.

[0022] Preferably, the smoothing and rust-preventing oil is composed of barium dinonylnaphthalenesulfonate, dodecenyl succinate monoester, and O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate in a mass ratio of (1-3):(1-2):1.

[0023] When the above-mentioned mass ratios of barium dinonylnaphthalenesulfonate, dodecenyl succinate, and O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate are used, the steel strip will have better rust prevention properties.

[0024] Preferably, the water cooling, mixed cooling, and water cooling operations in the first annealing, second annealing, and third annealing are performed by a combined cooling mechanism;

[0025] The combined cooling mechanism includes an air-cooled component and a water-cooled component slidably connected to the outer peripheral surface of the air-cooled component. The air-cooled component includes a main air duct, at least one secondary air duct, and a transmission component. The secondary air duct is disposed on the outer peripheral surface of the main air duct. The main air duct and the secondary air duct are parallel to each other and connected. The air inlet ends of both the main air duct and the secondary air duct are connected to a fan. The drive end of the transmission component is disposed inside the secondary air duct.

[0026] The water-cooling assembly includes a connecting ring, several water outlet valves, and several first electromagnets. The connecting ring is slidably connected to the outer circumferential surface of the main air duct. The water outlet valves are disposed on the connecting ring. The first electromagnets are disposed on the outer circumferential surface of the main air duct. The control end of the transmission component is disposed on the connecting ring. Under the action of wind force, the transmission component drives the water outlet valves to move closer to the first electromagnets.

[0027] The water outlet valve includes a water outlet pipe, a control pipe, and a valve ball. The control pipe is vertically installed at the water outlet end of the water outlet pipe, and the water inlet end of the water outlet pipe is connected to a water source. The valve ball is slidably connected inside the control pipe. Under the action of gravity, the valve ball always blocks the outlet of the water outlet pipe. An iron block is installed inside the valve ball, and the first electromagnet forces the valve ball to release the blockage of the water outlet pipe through the iron block.

[0028] When cooling of the steel strip is required, workers can directly turn on the fan. At this time, the fan directly cools the steel coil through the main air duct. Simultaneously, the fan performs work on the drive end of the transmission component through the auxiliary air duct, causing the control connecting ring of the transmission component to slowly move closer to the first electromagnet. During this period, only the steel coil is cooled by air.

[0029] When the first electromagnet comes into contact with the upper end of the control tube, it attracts the iron block to move upward, thereby causing the valve ball to release the blockage on the water outlet pipe, thus achieving simultaneous air-cooling and water-cooling of the product, i.e., mixed cooling. When water cooling is required, simply block the air outlet of the main air duct to perform water-cooling operation only.

[0030] Preferably, the transmission component includes a sliding plate, a connecting rope, and a fixed pulley. The sliding plate is slidably connected inside the secondary air duct, and the outer peripheral surface of the sliding plate abuts against the inner peripheral surface of the secondary air duct. The fixed pulley is disposed on the outer peripheral surface of the main air duct and above the secondary air duct. The connecting rope is wound around the fixed pulley, one end of the connecting rope is connected to the upper end surface of the sliding plate, and the other end of the connecting rope is connected to the connecting ring.

[0031] When the fan blows air onto the secondary duct, the sliding plate gradually moves downward under the force of the wind. At this time, the sliding plate drives the connecting ring upward through the connecting rope and fixed pulley, thereby realizing the control of the movement of the connecting ring by the wind. Moreover, the mass of the connecting ring itself can also cause the sliding plate to return to its original position when the fan stops running, preparing for the next air-cooled / water-cooled operation.

[0032] Preferably, it further includes a control component for controlling air cooling. The control component includes a sleeve fixedly fitted onto the air outlet of the main air duct, a second electromagnet disposed inside the main air duct, and a blocking component disposed inside the main air duct. The blocking component includes a cross iron frame, a connecting rod, and a blocking ball. One end of the connecting rod is fixedly connected to the cross iron frame, and the other end of the connecting rod is fixedly connected to the blocking ball. The cross iron frame is mounted inside the main air duct, and the blocking ball is disposed inside the sleeve. The diameter of the blocking ball is larger than the diameter of the air outlet of the main air duct.

[0033] When it is necessary to block the air outlet of the main air duct, the staff can directly activate the second electromagnet. At this time, the second electromagnet controls the blocking ball to move upward through the cross iron frame. When the blocking ball moves to the air outlet of the main air duct, the blocking ball can block the main air duct, thereby realizing the operation of water cooling only.

[0034] Preferably, the control component further includes a drive element for driving the second electromagnet to operate;

[0035] The driving component includes a water storage tank, a float plate slidably connected to the water storage tank, and a control block fixedly connected to the upper end face of the float plate. The water inlet end of the water storage tank is connected to the water outlet end of one of the water outlet valves. The diameter of the water inlet end of the water outlet tank is smaller than the diameter of the water outlet end of the water outlet valve.

[0036] The outer circumferential surface of the main air duct is provided with a drive button for activating the second electromagnet. The outer circumferential surface of the main air duct is provided with a sliding frame. A sliding block is slidably connected to the sliding frame. A compression spring is provided on the sliding block. The end of the compression spring away from the sliding block is fixedly connected to the main air duct. The drive button is located inside the compression spring.

[0037] The sliding block has a guide surface on the side away from the compression spring. The guide surface gradually slopes downward toward the compression spring. The upward movement of the control block forces the sliding block to move closer to the drive button through the guide surface.

[0038] During the cooling process of the steel coil, one of the outlet valves continuously transfers water to the storage tank. As the water volume in the storage tank increases, the float plate moves the control block upwards. When the control block comes into contact with the guide surface, it can control the sliding block to move closer to the drive button and ultimately activate the second electromagnet, thus enabling water-only cooling.

[0039] Preferably, the driving component further includes a siphon pipe disposed at the upper part of the water storage tank, one end of the siphon pipe being located at the bottom of the water storage tank, and the other end of the siphon pipe extending outward and located below the water storage tank.

[0040] When the water level in the storage tank reaches the bend of the siphon pipe, the water in the storage tank can be discharged through the siphon pipe. At this time, turning off the fan can completely shut down and reset both the air-cooled and water-cooled systems.

[0041] In summary, this application has the following beneficial effects:

[0042] 1. Using air cooling, mixed cooling, or water cooling methods can effectively control the steady decrease of steel strip temperature, thereby promoting better microstructure and internal stress matching of the steel strip and effectively reducing the possibility of local breakage during steel strip winding.

[0043] 2. When the rust inhibitor is a mixture of barium dinonylnaphthalenesulfonate, dodecenyl succinate monoester and O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate, the steel strip will have better rust prevention performance.

[0044] 3. When cooling of the steel strip is required, the operator can directly turn on the fan. At this time, the fan directly cools the steel coil through the main air duct. Simultaneously, the fan performs work on the drive end of the transmission component through the auxiliary air duct, thereby causing the control connecting ring of the transmission component to slowly move closer to the first electromagnet. During this period, only the steel coil is cooled by air.

[0045] When the first electromagnet comes into contact with the upper end of the control tube, it can attract the iron block to move upward, thereby driving the valve ball to release the blockage of the water outlet pipe, thus realizing the synchronous air cooling and water cooling of the product, i.e., mixed cooling.

[0046] During the cooling process of the steel coil, one of the outlet valves continuously transfers water to the storage tank. As the water volume in the tank increases, the float plate moves the control block upwards. When the control block comes into contact with the guide surface, it controls the sliding block to move closer to the drive button and ultimately activate the second electromagnet. The second electromagnet, through a cross-shaped iron frame, controls a blocking ball to block the air outlet of the main duct, thus achieving water-only cooling operation.

[0047] When the water level in the storage tank reaches the bend of the siphon pipe, the fan is turned off, which completely shuts down the air-cooled and water-cooled systems. The water in the storage tank is then discharged through the siphon pipe, thereby removing the blockage to the main air duct and achieving a complete reset. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the combined cooling mechanism;

[0049] Figure 2 This is an exploded diagram of the air-cooled components;

[0050] Figure 3 This is a schematic diagram of the water-cooling assembly;

[0051] Figure 4 This is an exploded view of the transmission components;

[0052] Figure 5 This is a schematic diagram of the explosion of the water outlet valve;

[0053] Figure 6 This is an exploded view of the air-cooled components and control components;

[0054] Figure 7 This is a structural diagram of the drive unit and the outlet valve;

[0055] Figure 8 yes Figure 6 Enlarged schematic diagram of part A in the middle.

[0056] Reference numerals: 1. Air-cooled assembly; 2. Water-cooled assembly; 3. Control assembly; 11. Main air duct; 12. Secondary air duct; 13. Transmission component; 21. Connecting ring; 22. Water outlet valve; 23. First electromagnet; 31. Sleeve; 32. Second electromagnet; 33. Drive component; 34. Blocking component; 131. Sliding plate; 132. Connecting rope; 133. Fixed pulley; 221. Water outlet pipe; 222. Control pipe; 223. Valve ball; 331. Water storage tank; 332. Float plate; 333. Control block; 334. Siphon tube; 335. Drive button; 336. Sliding frame; 337. Sliding block; 338. Compression spring; 339. Guide surface; 341. Cross iron frame; 342. Connecting rod; 343. Blocking ball. Detailed Implementation

[0057] The following is in conjunction with the appendix Figure 1-8 The present application will be further described in detail with reference to Examples 1-11.

[0058] raw material

[0059] Trimethylolpropane oleate CAS: 11138-60-6; ​​Polyethylene glycol monohexadecyl ether CAS: 9004-95-9; Castor oil base oil CAS: 8001-79-4; Polyisobutylene CAS: 9003-27-4; Barium dinonylnaphthalene sulfonate CAS: 25619-56-1; Dodecenyl succinate CAS: 64090-83-1; O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate CAS: 105832-38-0.

[0060] Example

[0061] Example 1

[0062] A process for producing rolled ferrous metal products includes the following steps:

[0063] Pickling: The steel strip is straightened, then pickled, washed and dried in sequence, and finally coiled to obtain a steel coil; the steel strip is SK85 steel, the pickling is done with 5% hydrochloric acid, and the pickling temperature is 70℃.

[0064] First annealing: The steel coil is loaded into the annealing furnace, and then a protective gas is introduced. In this embodiment, the protective gas can be selected arbitrarily according to the actual situation. Then, the temperature inside the furnace is raised to 700°C at a heating rate of 45°C / h, and then the steel strip is held at this temperature for 12 hours. After the holding period, the steel strip is cooled to 550°C in the furnace, then cooled to 300°C by air cooling, then cooled to 140°C by mixed cooling, and finally cooled to 65°C by water cooling before being taken out of the furnace to obtain a first annealed steel coil.

[0065] The hybrid cooling system involves simultaneous air cooling and water cooling.

[0066] First rolling: The annealed steel coil is rolled in five passes with thicknesses of 2.52mm, 2.3mm, 1.9mm, 1.75mm, 1.50mm and 1.42mm respectively, and finally coiled to obtain a first rolled steel coil.

[0067] Second annealing: The primary rolled steel coil is loaded into the annealing furnace, and then a protective gas is introduced. The furnace temperature is then raised to 740°C at a heating rate of 45°C / h, and the steel coil is held at this temperature for 7 hours. After that, the temperature is lowered to 700°C at a cooling rate of 20°C / h, and held at this temperature for 5 hours. After the holding period, the steel coil is cooled to 550°C in the furnace, then cooled to 300°C by air cooling, then cooled to 140°C by mixed cooling, and finally cooled to 65°C by water cooling before being removed from the furnace, thus obtaining a secondary annealed steel coil.

[0068] Second rolling: The annealed steel coil is rolled in five passes with thicknesses of 1.42mm, 1.25mm, 0.9mm, 0.7mm, 0.55mm and 0.5mm respectively, and finally coiled to obtain the second rolled steel coil.

[0069] Third annealing: The secondary rolled steel coil is loaded into the annealing furnace, and then a protective gas is introduced. The furnace temperature is then raised to 700°C at a heating rate of 45°C / h, and the steel coil is held at this temperature for 12 hours. The steel coil is then cooled in the furnace to 550°C, then cooled to 300°C by air cooling, then cooled to 140°C by mixed cooling, and finally cooled to 65°C by water cooling before being removed from the furnace, thus obtaining a tertiary annealed steel coil.

[0070] Finishing: The 3-times annealed steel coils are oiled, pressure-flattened, and trimmed before being finally coiled and stored.

[0071] The water cooling, mixed cooling, and water cooling operations in the first, second, and third annealing processes are carried out through a combined cooling mechanism, the specific structure of which is as follows.

[0072] Reference Figure 1 and Figure 2 The combined cooling mechanism includes an air-cooled component 1, a water-cooled component 2, and a control component 3. The water-cooled component 2 is slidably connected to the outer peripheral surface of the air-cooled component 1, and the control component 3 is disposed between the air-cooled component 1 and the water-cooled component 2. The air-cooled component 1 is used to blow air onto the steel coil, the water-cooled component 2 is used to spray water onto the steel coil, and the control component 3 is used to control the operation of the air-cooled component 1, thereby achieving sequential air cooling, water cooling, and mixed cooling.

[0073] Reference Figure 2 and Figure 3 The air-cooled assembly 1 includes a main air duct 11, four auxiliary air ducts 12, and four transmission components 13. The four auxiliary air ducts 12 are circumferentially and evenly spaced on the outer circumferential surface of the main air duct 11, and the main air duct 11 and the four auxiliary air ducts 12 are parallel to each other and connected. The air inlet ends of the main air duct 11 and the air inlet ends of the auxiliary air ducts 12 are both connected to a fan, while the drive end of the transmission component 13 is located inside the auxiliary air duct 12.

[0074] The water-cooled assembly 2 includes a connecting ring 21, eight water outlet valves 22, and eight first electromagnets 23. The connecting ring 21 is slidably connected to the outer circumferential surface of the main air duct 11. The eight water outlet valves 22 are circumferentially and evenly spaced on the outer circumferential surface of the connecting ring 21, and the eight first electromagnets 23 are circumferentially and evenly spaced on the outer circumferential surface of the main air duct 11. The eight water outlet valves 22 correspond one-to-one with the eight first electromagnets 23. The control end of the transmission component 13 is located on the connecting ring 21. Under the action of wind force, the transmission component 13 drives the water outlet valves 22 to approach and abut against the first electromagnets 23.

[0075] Reference Figure 2 and Figure 4 The transmission component 13 includes a sliding plate 131, a connecting rope 132, and a fixed pulley 133. The sliding plate 131 is slidably connected inside the secondary air duct 12, and the outer peripheral surface of the sliding plate 131 is always in contact with the inner peripheral surface of the secondary air duct 12. The fixed pulley 133 is fixedly connected to the outer peripheral surface of the main air duct 11 and is located above the secondary air duct 12. The connecting rope 132 is wound around the fixed pulley 133. One end of the connecting rope 132 is fixedly connected to the upper end surface of the sliding plate 131, and the other end of the connecting rope 132 is fixedly connected to the upper end surface of the connecting ring 21.

[0076] Reference Figure 3 and Figure 5The outlet valve 22 includes an outlet pipe 221, a control pipe 222, and a valve ball 223. The control pipe 222 is vertically fixed to the outlet end of the outlet pipe 221, and the inlet end of the outlet pipe 221 is connected to a water source. The valve ball 223 is slidably connected inside the control pipe 222, and under the action of gravity, the valve ball 223 always blocks the outlet of the outlet pipe 221. An iron block is embedded in the valve ball 223, and the first electromagnet 23 uses the iron block to constantly force the valve ball 223 to release the blockage of the outlet pipe 221.

[0077] Reference Figure 1 and Figure 6 The control component 3 includes a sleeve 31 fixedly fitted onto the air outlet of the main air duct 11, a second electromagnet 32 ​​fixedly connected inside the main air duct 11, a drive component 33 for controlling the operation of the second electromagnet 32, and a blocking component 34 for blocking the air outlet of the main air duct 11.

[0078] The blocking component 34 includes a cross-shaped iron frame 341, a connecting rod 342, and a blocking ball 343. One end of the connecting rod 342 is fixedly connected to the cross-shaped iron frame 341, and the other end of the connecting rod 342 is fixedly connected to the blocking ball 343. The cross-shaped iron frame 341 is mounted at the air outlet of the main air duct 11, and the second electromagnet 32 ​​attracts the cross-shaped iron frame 341. The blocking ball 343 is housed in the sleeve 31, and the diameter of the blocking ball 343 is larger than the diameter of the air outlet of the main air duct 11.

[0079] Reference Figure 7 and Figure 8 The driving component 33 includes a water storage tank 331, a float 332 slidably connected within the water storage tank 331, a control block 333 fixedly connected to the upper surface of the float 332, and a siphon pipe 334 fixedly connected to the upper part of the water storage tank 331. One end of the water storage tank 331 is connected to the outlet end of one of the water outlet valves 22, and the diameter of the inlet end of the water storage tank 331 is smaller than the diameter of the outlet end of the water outlet valve 22. One end of the siphon pipe 334 is located at the bottom of the water storage tank 331, and the other end of the siphon pipe 334 extends outward and is located below the water storage tank 331.

[0080] A drive button 335 for activating the second electromagnet 32 ​​is installed on the outer circumferential surface of the main air duct 11. A sliding bracket 336 is fixedly connected to the outer circumferential surface of the main air duct 11. A sliding block 337 is slidably connected to the sliding bracket 336. A compression spring 338 is fixedly connected to the inner end face of the sliding block 337. The end of the compression spring 338 away from the sliding block 337 is fixedly connected to the main air duct 11. The drive button 335 is located inside the compression spring 338. A guide surface 339 is provided on the side of the sliding block 337 away from the compression spring 338. The guide surface 339 gradually slopes downward toward the compression spring 338. The upward movement of the control block 333 forces the sliding block 337 toward the drive button 335 through the guide surface 339.

[0081] When cooling of the steel strip is required, the operator can directly turn on the fan. At this time, the fan directly cools the steel coil through the main air duct 11. At the same time, the fan performs work on the drive end of the transmission component 13 through the auxiliary air duct 12, thereby causing the transmission component 13 to control the connecting ring 21 to slowly move closer to the first electromagnet 23. During this period, only the steel coil is cooled by air.

[0082] When the first electromagnet 23 comes into contact with the upper end of the control tube 222, the first electromagnet 23 can attract the iron block to move upward, thereby driving the valve ball 223 to release the blockage of the water outlet pipe 221, thus realizing the synchronous air cooling and water cooling of the product, i.e., mixed cooling.

[0083] During the mixed cooling process of the steel coil, one of the water outlet valves 22 continuously transfers water into the water storage tank 331. As the water volume in the water storage tank 331 increases, the float 332 drives the control block 333 to gradually move upward. When the control block 333 comes into contact with the guide surface 339, the control block 333 can control the sliding block 337 to move closer to the drive button 335 through the guide surface 339, and finally activate the second electromagnet 32. The second electromagnet 32 ​​controls the blocking ball 343 to block the air outlet of the main air duct 11 through the cross iron frame 341, thereby realizing water-only cooling operation.

[0084] When the water level in the water tank 331 reaches the bend of the siphon pipe 334, the fan is turned off, thus completely shutting down the air-cooled and water-cooled systems. The water in the water tank 331 is then discharged through the siphon pipe 334, forcing the control block 333 to move downwards. The sliding block 337 then resets under the elastic force of the compression spring 338, thereby completing the second electromagnet 32. The blocking ball 343 then releases its blockage on the main air duct 11 under the action of gravity, thus achieving a complete reset.

[0085] It should be noted that, in this embodiment, the above-mentioned fixed connection can be selected according to the actual situation, such as welding, integral molding, bolting, or other conventional fixed connection methods, and the above-mentioned sliding connection can be selected according to the actual situation, such as slide rails or other conventional sliding connection methods.

[0086] In addition, during the finishing process, the oil used for the oiling operation is a smoothing and rust-preventive oil.

[0087] The smoothing and rust-preventive oil is composed of the following raw materials by weight: 400 kg trimethylolpropane oleate, 300 kg rust inhibitor, 20 kg polyethylene glycol monohexadecyl ether, 550 kg castor oil base oil, and 20 kg polyisobutylene;

[0088] The rust inhibitor is a mixture of barium dinonylnaphthalenesulfonate, dodecenyl succinate monoester, and O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate, wherein the mass ratio of barium dinonylnaphthalenesulfonate, dodecenyl succinate monoester, and O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate is 2:1.5:1.

[0089] Example 2

[0090] The difference from Example 1 is that, in the first, second and third annealing processes, after the steel coil is cooled to 550°C in the furnace, it is cooled to 65°C only by air cooling.

[0091] Example 3

[0092] The difference from Example 1 is that, in the first, second and third annealing processes, after the steel coil is cooled to 550°C in the furnace, it is cooled to 65°C only by water cooling.

[0093] Example 4

[0094] The difference from Example 1 is that in the first annealing, second annealing and third annealing, after the steel coil is cooled to 550°C in the furnace, it is first cooled to 300°C by air cooling, and then cooled to 65°C by water cooling.

[0095] Examples 5-6

[0096] The difference from Example 1 is that the amount of each component of the leveling and rust-preventing oil added is different, as shown in Table 1.

[0097] Table 1. Dosage of each component added to the leveling and rust-preventive oil in Examples 1 and 5-6 (kg)

[0098] Example 1 Example 5 Example 6 Trimethylolpropane oleate 400 450 350 Rust inhibitor 300 350 250 Polyethylene glycol monohexadecyl ether 20 10 30 Castor oil base oil 550 500 600 Polyisobutylene 20 30 10

[0099] Example 7

[0100] The difference from Example 1 is that the rust inhibitor is only barium dinonylnaphthalenesulfonate.

[0101] Example 8

[0102] The difference from Example 1 is that the rust inhibitor is only dodecenyl succinate monoester.

[0103] Example 9

[0104] The difference from Example 1 is that the rust inhibitor is only O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate.

[0105] Example 10

[0106] The difference from Example 1 is that the mass ratio of barium dinonylnaphthalenesulfonate, dodecenyl succinate monoester and O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate is 3:1:1.

[0107] Example 11

[0108] The difference from Example 1 is that the mass ratio of barium dinonylnaphthalenesulfonate, dodecenyl succinate monoester and O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate is 1:2:1.

[0109] Performance testing

[0110] I. Surface Crack Test of Steel Strip

[0111] 1000 samples were taken from each of Examples 1-6, and then tested using a See Vision cold-rolled steel strip surface tester. The pass rate of the 1000 samples was then recorded, and the test data are shown in Table 2.

[0112] II. Rust prevention performance test

[0113] Three samples were taken from Examples 1 and 7-11 respectively, and then the samples were prepared into standard test specimens according to SH / T0217-1998 "Rust-preventive greases - Test piece rust degree evaluation method". Then, the above samples were subjected to rust test according to SH / T0081-1991 "Rust-preventive greases - Salt spray test method". Finally, the rust degree of the samples was obtained according to SH / T0217-1998 "Rust-preventive greases - Test piece rust degree evaluation method" and the average value was taken. The test data are shown in Table 3.

[0114] Table 2 Surface Crack Detection Data of Examples 1-6

[0115] Pass rate / % Pass rate / % Example 1 99.8％ Example 4 98.6％ Example 2 96.2％ Example 5 99.4％ Example 3 95.9％ Example 6 99.6％

[0116] Table 3 Rust prevention performance of Examples 1 and 7-11

[0117] Corrosion degree / % Corrosion degree / % Example 1 1.3％ Example 9 8.7％ Example 7 6.3％ Example 10 3.0％ Example 8 7.7％ Example 11 1.7％

[0118] Referring to Examples 1-4 and Table 2, it can be seen that the pass rates of Examples 2-4 are significantly lower than those of Example 1. This indicates that using air cooling, mixed cooling, and water cooling in the first, second, and third annealing operations can effectively reduce the possibility of steel strip breakage during winding.

[0119] Referring to Examples 1 and 5-6 and in conjunction with Table 2, it can be seen that the pass rate of Examples 5-6 is slightly lower than that of Example 1. This indicates that when the components of the leveling and rust-preventive oil are added in the amounts specified in the examples, the possibility of breakage during steel strip winding can be effectively reduced.

[0120] Referring to Examples 1 and 7-9 and in conjunction with Table 3, it can be seen that the degree of rust in Examples 7-9 is significantly improved compared to Example 1. This indicates that, compared to using barium dinonylnaphthalenesulfonate, dodecenyl succinate, or O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate as the leveling rust inhibitor in this application, the steel strip will have superior rust prevention performance when a mixture of barium dinonylnaphthalenesulfonate, dodecenyl succinate, and O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate is selected.

[0121] Referring to Examples 1 and 10-11 and in conjunction with Table 3, it can be seen that the degree of corrosion in Examples 10-11 is slightly improved compared to Example 1. This indicates that when barium dinonylnaphthalenesulfonate, dodecenyl succinate, and O-(N-succinimide)-1,1,3,3-tetramethylurea tetrafluoroborate are used in the same mass ratio as in Example 1, the steel strip will have better rust prevention performance.

[0122] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A combined cooling mechanism for the production of rolled products in ferrous metal smelting, characterized in that: The system includes an air-cooled assembly (1) and a water-cooled assembly (2) slidably connected to the outer peripheral surface of the air-cooled assembly (1). The air-cooled assembly (1) includes a main air duct (11), at least one secondary air duct (12), and a transmission component (13). The secondary air duct (12) is disposed on the outer peripheral surface of the main air duct (11). The main air duct (11) and the secondary air duct (12) are parallel to each other and connected. The air inlet ends of the main air duct (11) and the secondary air duct (12) are both connected to a fan. The drive end of the transmission component (13) is disposed inside the secondary air duct (12). The water-cooling assembly (2) includes a connecting ring (21), several outlet valves (22) and several first electromagnets (23). The connecting ring (21) is slidably connected to the outer circumferential surface of the main air duct (11). The outlet valves (22) are disposed on the connecting ring (21). The first electromagnets (23) are disposed on the outer circumferential surface of the main air duct (11). The control end of the transmission component (13) is disposed on the connecting ring (21). Under the action of wind force, the transmission component (13) drives the outlet valves (22) to move closer to the first electromagnets (23). The outlet valve (22) includes an outlet pipe (221), a control pipe (222), and a valve ball (223). The control pipe (222) is vertically installed at the outlet end of the outlet pipe (221). The inlet end of the outlet pipe (221) is connected to a water source. The valve ball (223) is slidably connected inside the control pipe (222). Under the action of gravity, the valve ball (223) always blocks the outlet of the outlet pipe (221). An iron block is installed inside the valve ball (223). The first electromagnet (23) forces the valve ball (223) to release the blockage of the outlet pipe (221) through the iron block.

2. The combined cooling mechanism according to claim 1, characterized in that: The transmission component (13) includes a sliding plate (131), a connecting rope (132), and a fixed pulley (133). The sliding plate (131) is slidably connected to the auxiliary air duct (12). The outer peripheral surface of the sliding plate (131) abuts against the inner peripheral surface of the auxiliary air duct (12). The fixed pulley (133) is disposed on the outer peripheral surface of the main air duct (11) and is disposed above the auxiliary air duct (12). The connecting rope (132) is wound around the fixed pulley (133). One end of the connecting rope (132) is connected to the upper end surface of the sliding plate (131), and the other end of the connecting rope (132) is connected to the connecting ring (21).

3. The combined cooling mechanism according to claim 1, characterized in that: It also includes a control component (3) for controlling air cooling. The control component (3) includes a sleeve (31) fixedly sleeved on the air outlet of the main air duct (11), a second electromagnet (32) disposed in the main air duct (11), and a blocking component (34) disposed in the main air duct (11). The blocking component (34) includes a cross iron frame (341), a connecting rod (342), and a blocking ball (343). One end of the connecting rod (342) is fixedly connected to the cross iron frame (341), and the other end of the connecting rod (342) is fixedly connected to the blocking ball (343). The cross iron frame (341) is mounted in the main air duct (11), and the blocking ball (343) is disposed in the sleeve (31). The diameter of the blocking ball (343) is larger than the diameter of the air outlet of the main air duct (11).

4. The combined cooling mechanism according to claim 3, characterized in that: The control component (3) also includes a drive element (33) for driving the second electromagnet (32) to operate. The driving component (33) includes a water storage tank (331), a float plate (332) slidably connected in the water storage tank (331), and a control block (333) fixedly connected to the upper end face of the float plate (332). The water inlet end of the water storage tank (331) is connected to the water outlet end of one of the water outlet valves (22). The diameter of the water inlet end of the water storage tank (331) is smaller than the diameter of the water outlet end of the water outlet valve (22). The outer periphery of the main air duct (11) is provided with a drive button (335) for activating the second electromagnet (32). The outer periphery of the main air duct (11) is provided with a sliding frame (336). A sliding block (337) is slidably connected to the sliding frame (336). A compression spring (338) is provided on the sliding block (337). The end of the compression spring (338) away from the sliding block (337) is fixedly connected to the main air duct (11). The drive button (335) is located inside the compression spring (338). The sliding block (337) has a guide surface (339) on the side away from the compression spring (338). The guide surface (339) gradually tilts downward toward the compression spring (338). The upward movement of the control block (333) forces the sliding block (337) to move closer to the drive button (335) through the guide surface (339).

5. The combined cooling mechanism according to claim 4, characterized in that: The drive unit (33) also includes a siphon pipe (334) disposed on the upper part of the water storage tank (331), one end of the siphon pipe (334) being located at the bottom of the water storage tank (331), and the other end of the siphon pipe (334) extending outward and located below the water storage tank (331).

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