Solid solution heat treatment method for high-end coiled product

Abstract

The invention relates to the field of heat treatment of stainless steel wire rods. A solid solution heat treatment method for high-end coiled products comprises the steps that firstly, the temperature and stability of a solid solution furnace are improved, and the highest temperature can be larger than 1400 DEG C; secondly, the arrangement thought that the two furnace bodies share the charging and discharging forklift and the turnover mechanism is adopted, the occupied area and cost of equipment are reduced, meanwhile, a transition table is arranged at the parallel position of the opposite furnace body of the turnover mechanism, production selection of multiple processes is achieved, the charging and discharging forklift is controlled in a full-automatic mode, and the time from furnace door starting to water entering is shorter than 25 seconds. The rapid water entering time of the high-temperature coil in the key procedure is shorter than 25 seconds, it is theoretically guaranteed that the grain size, intergranular corrosion resistance and other performance indexes all reach the high standard, the grain size grade difference of all points is smaller than the second grade, the material structure and components are uniform and consistent, the material machining hardness is eliminated, and the heat treatment performance of the material is greatly improved; and the process requirements of special steel types such as nickel-based alloy and iron-chromium-aluminum are met, and stable product performance is achieved.

Description

Technical Field

[0001] The invention relates to the field of heat treatment of stainless steel wire rods. Background Art

[0002] Metal heat treatment is one of the important processes in mechanical manufacturing. Compared with other processing technologies, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but rather changes the internal microstructure of the workpiece or the chemical composition of the workpiece surface to give or improve the performance of the workpiece. Its characteristic is to improve the intrinsic quality of the workpiece, which is generally not visible to the naked eye. In order to make the metal workpiece have the required mechanical properties, physical properties and chemical properties, in addition to the reasonable selection of materials and various forming processes, heat treatment processes are often indispensable. Steel is the most widely used material in the machinery industry. The microstructure of steel is complex and can be controlled by heat treatment, so the heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium and their alloys can also change their mechanical, physical and chemical properties through heat treatment to obtain different performance.

[0003] The heat treatment process generally includes three processes: heating, heat preservation and cooling, and sometimes only two processes: heating and cooling. These processes are interconnected and cannot be interrupted. Heating is one of the important processes of heat treatment. There are many heating methods for metal heat treatment. The earliest ones used charcoal and coal as heat sources, and then liquid and gas fuels were used. The application of electricity makes heating easy to control and has no environmental pollution. These heat sources can be used for direct heating, or indirectly through molten salt or gold, or even floating particles. When the metal is heated, the workpiece is exposed to the air, and oxidation and decarburization often occur (that is, the carbon content on the surface of the steel parts is reduced), which has a very adverse effect on the surface properties of the parts after heat treatment. Therefore, the metal should usually be heated in a controlled atmosphere or protective atmosphere, in molten salt and in a vacuum, and can also be heated by coating or packaging methods. The heating temperature is one of the important process parameters of the heat treatment process. Selecting and controlling the heating temperature is the main issue to ensure the quality of heat treatment. The heating temperature varies with the metal material being treated and the purpose of the heat treatment, but it is generally heated above the phase change temperature to obtain a high-temperature structure. In addition, the transformation requires a certain amount of time. Therefore, when the surface of the metal workpiece reaches the required heating temperature, it is necessary to maintain this temperature for a certain period of time to make the internal and external temperatures consistent and to complete the microstructure transformation. This period of time is called the holding time. When high-energy-density heating and surface heat treatment are used, the heating speed is extremely fast, and generally there is no holding time, while the holding time of chemical heat treatment is often longer.

[0004] The design furnace temperature of some existing stainless steel coil heat treatment equipment is 1100℃, which does not meet the heating temperature requirement of 1200℃ for nickel-based alloys, iron-chromium-aluminum and other steels. Therefore, nickel-based alloys, iron-chromium-aluminum and other steels need to be overloaded during production to keep them warm. However, overload operation causes frequent failures of the insulation and control systems, high maintenance costs for the solution furnace, and frequent replacement of resistance bands. Summary of the invention

[0005] The technical problem to be solved by the present invention is: how to improve the coil solid solution method, improve the stability of the heating equipment, ensure the stability of the product heating temperature from the equipment, and reduce the maintenance time and cost of the furnace body.

[0006] The technical solution adopted by the present invention is: a method for solid solution heat treatment of high-end coil products, firstly, the temperature and stability of the solid solution furnace are improved, and the maximum temperature can be greater than 1400°C; secondly, the layout idea of ​​two furnace bodies sharing the loading and unloading forklift and the turning mechanism is adopted to reduce the equipment footprint and cost, and at the same time, a transition table is set at the parallel position of the furnace body opposite to the turning mechanism to realize multi-process production selection, and the loading and unloading forklift adopts fully automatic control to achieve a time from furnace door start to water entry of less than 25 seconds.

[0007] The method for improving the temperature and stability of the solid solution furnace is that the resistance belt of the solid solution furnace adopts the resistance belt made of Shougang HYZ material, so that the solid solution furnace can operate stably at a furnace temperature of 1200-1400°C, the electric control power regulation is stable, the heating efficiency of the solid solution furnace is high, and the heating time is 2.5 hours when the furnace is cold and waiting for material, and the furnace temperature control accuracy is high.

[0008] In one process route, the coil is loaded into the furnace through the turning mechanism, and the forklift waits at the furnace door. After the coil completes the heating and insulation process, the one-button start function is activated. The forklift takes the coil out of the solid solution furnace and quickly puts it on the support seat at the bottom of the water pool. The forklift retreats and rises to the turning mechanism to take the material, and moves it horizontally to the solid solution furnace for loading. After loading, the forklift goes to the bottom of the water pool and lifts the cooled coil on the support seat and moves it horizontally to the turning mechanism to put the coil on the turning mechanism. The forklift withdraws to the solid solution furnace door and waits for the next furnace. The coil of the turning mechanism is manually lifted away, and the coil to be solidified is replaced to complete a cycle.

[0009] One process route, the coil is loaded into the furnace through the turning mechanism, and the forklift waits at the furnace door. After the coil completes the heating and insulation process, the one-button start function is activated. The forklift takes the coil out of the solid solution furnace and quickly puts it into the water pool. The coil is not allowed to cool in the water pool for a long time. After cooling for 30 seconds, the forklift lifts the coil and moves it to the turning mechanism. The forklift moves forward to place the coil on the transition table, the forklift retreats to the turning mechanism to pick up the material, and moves it to the solid solution furnace for loading. After loading, the forklift goes to the turning mechanism to lift the coil on the transition table, retreats to the turning mechanism, and places the coil on the turning mechanism. The forklift retreats to the solid solution furnace to wait for the next furnace exit. The coil of the turning mechanism is manually lifted away, and the coil to be solidified is replaced to complete a cycle.

[0010] One process route, the coil is loaded into the furnace through the turning mechanism, and the forklift waits at the furnace door. After the coil completes the heating and insulation process, the one-button start function is activated, the forklift takes the coil out of the solid solution furnace and quickly puts it on the support seat at the bottom of the water pool, the forklift retreats and rises to the turning mechanism to pick up the material, and moves it horizontally to the solid solution furnace for loading. After loading, the forklift goes to the bottom of the water pool and lifts the coil in an air-cooled state on the support seat and moves it horizontally to the turning mechanism to place the coil on the turning mechanism, and the forklift withdraws to the door of the solid solution furnace and waits for the next time to be taken out of the furnace. When the coil is air-cooled at the turning mechanism to be ready for lifting operation, the coil of the turning mechanism is manually lifted away and the coil to be solid solution is replaced to complete a cycle.

[0011] The beneficial effects of the present invention are as follows: the time for the high-temperature coil to quickly enter the water in the key process of the present invention is less than 25 seconds, theoretically ensuring that the performance indicators such as grain size and intergranular corrosion resistance meet high standards, the grain size difference at each point is less than 2 levels, the material organization and composition are uniform, the material processing hardness is eliminated, the heat treatment performance of the material is greatly improved, the process requirements of special steels such as nickel-based alloys, iron-chromium-aluminum, etc. are met, and the product performance is stable. Through the process layout of the furnace body, solid solution water tank, loading and unloading forklift, turnover mechanism and other equipment, the output of solid solution products is greatly increased. DETAILED DESCRIPTION

[0012] The Wire Division is the company's main wire rod production plant. In 2019, it completed the installation of intelligent upgrading and transformation equipment for stainless steel bars and wires. In 2020, production and commissioning were normal. It can produce more than 200 steel grades, with more than 60 specifications ranging from φ5.5-φ120mm, forming a diversified product structure with clean ball steel and pure iron straight bars as basic products, and welding wire steel, duplex stainless rebar and pen tip steel as characteristic products. The surface quality, dimensional accuracy and physical and chemical properties of the products have reached the domestic advanced level. However, in the past two years, the Wire Division has mainly developed some high-end stainless steel wire rods with high profits. Typical steel grades are iron, chromium and aluminum. These high-end stainless steel wire rods have strict requirements on the subsequent heat treatment process. The existing solution furnace can no longer meet the quality and equipment requirements of high-end products, which seriously restricts the contract delivery of products.

[0013] The original solid solution furnace was put into operation in October 2011, with a design furnace temperature of 1100℃, which does not meet the heating temperature requirement of 1200℃ for nickel-based alloys, iron-chromium-aluminum and other steels. The overload operation has caused frequent failures in the insulation system and control system, high maintenance costs for the solid solution furnace, and frequent replacement of resistance belts. The loading and unloading mechanism is manually operated, which cannot meet the requirements of high-temperature coils to quickly start and ensure product quality. The layout of the loading and unloading mechanism is unreasonable, the empty furnace time for loading and unloading is too long, the production efficiency is low, the furnace idle consumption is large, and the monthly production capacity is about 500 tons.

[0014] Key process parameters: The design temperature of the solution furnace is 1100℃, the single furnace solution capacity is 2 coils, the maximum coil weight is about 1.2 tons, and the maximum height of a single coil is 1150mm; the loading and unloading mechanism adopts the principle of mobile trolley and coil lifting, and the whole process is manually operated. The quenching process (from the opening of the furnace door to the rapid entry of the coil into the water) takes about 40 seconds. It takes 30 to 40 minutes to load and unload after the furnace is taken out.

[0015] The concept of this invention comes from the defects and drawbacks of the original solid solution furnace. In order to improve product quality and efficiency, our department has added high value-added stainless steel products to the production and sales of high-end products. Due to the high value of this product, the production process and the subsequent heat treatment process requirements are more stringent. If the heat treatment process cannot meet the requirements, a large number of waste products will appear, and the contract cannot be fulfilled for customers. Therefore, it is imperative to improve the heat treatment process of high-end coil products. The original solid solution equipment has few considerations in the early stage, long equipment time, and few solid solution products in the past, so the product has general requirements for heat treatment process. If you want to develop high-end stainless steel wire rods, the heat treatment process is the bottleneck of production quality and efficiency.

[0016] The present invention draws on the experience of the same type of solid solution furnaces and the drawbacks of the original solid solution furnaces, and first ensures the stability of the furnace temperature and the reliability of high-temperature heating. Under the premise of considering cost and performance, Shougang HYZ material resistance belt is selected, the maximum temperature can reach 1400℃, and it can operate reliably under high temperature conditions. The resistance belt is arranged according to the weight of the heating coil and uses about 550 kilowatts of power to ensure heating efficiency. The resistance belt of the solid solution furnace is made of Shougang HYZ material, the heating temperature reaches 1200℃, and the electronic control power regulation is stable. The solid solution furnace has high heating efficiency. When the furnace is cold and waiting for material, the heating time is 2.5 hours, and the furnace temperature control accuracy is high. The height size design of the heating furnace is more reasonable, which can meet the solid solution treatment of existing large billet coils.

[0017] The layout of the solid solution equipment makes use of the existing site and adopts the layout idea of ​​two furnace bodies sharing the loading and unloading forklift and the turning mechanism, which reduces the equipment footprint and cost. At the same time, a transition table is set in the parallel position of the furnace body opposite the turning mechanism to realize multi-process production selection.

[0018] The loading and unloading forklift is used for the transportation and handling of coils for loading, unloading, and water cooling. The structure of the machine is a forklift lifting form. It consists of a traveling trolley (lifting mechanism, traveling mechanism, guide frame), bracket, traveling guide rail beam and control system. The trolley adopts a high-power motor reducer with starting and braking functions to drive the trolley to move forward quickly and stop accurately. The forklift lifting adopts a single hydraulic cylinder drive form. The cylinder action valve group adopts a proportional valve and a synchronous valve. The water entry and descent is achieved by the deadweight of the coil and the rapid pressure relief of the single-action cylinder, and the synchronization of the action is guaranteed.

[0019] The manual, automatic and one-button start functions of the forklift for loading and unloading furnaces are realized. The forklift for loading and unloading furnaces adopts full automatic control, and the time from furnace door start to water entry is less than 25 seconds, which meets the requirements. It takes 5 minutes for the solid solution coil to be unloaded from the furnace to the solid solution coil to be loaded into the furnace. It takes 10 minutes from the forklift to load the coil into the furnace, transfer and wait for the next furnace to be unloaded, which reduces the empty furnace time, saves electricity costs and improves production efficiency.

[0020] From the production operation point of view, about 50 rolls of iron-clad aluminum can be dissolved every day, about 60 tons. The dissolving capacity has increased by 2.5 times compared with the original, effectively solving the "bottleneck" of insufficient dissolving capacity that restricts the fulfillment of the contract, and fully meeting the requirements.

[0021] It can realize rapid process switching and production continuity. While ensuring 25 seconds of water entry time, the product performance is more stable. It is suitable for all steel types that require solid solution heat treatment and meets the requirements of high-temperature solid solution heat treatment processes for various high-end stainless steel products. Through low investment and simplified equipment, it improves the heat treatment level of high-end products in this field.

[0022] This heat treatment process method is designed and constructed independently, has a simple structure, is easy to operate, has universal technical and economic significance, and has certain promotion value. It has trained the ability of engineering and technical personnel to design and solve problems by themselves, and enhanced the ideas and awareness of employees to creatively solve problems.

[0023] Solid solution method 1 (can stay in the pool for a long time) The coil is loaded into the furnace through the turning mechanism. The forklift waits at the furnace door. After the coil completes the heating and insulation process, the one-button start function is activated. The forklift takes the coil out of the solid solution furnace and quickly puts it on the support seat at the bottom of the water pool. The forklift moves back and rises to the turning mechanism to take the material, and moves it horizontally to the solid solution furnace for loading. After loading, the forklift goes to the bottom of the water pool and lifts the cooled coil on the support seat and moves it horizontally to the turning mechanism. The coil is placed on the turning mechanism, and the forklift withdraws to the solid solution furnace door and waits for the next furnace. The coil of the turning mechanism is manually lifted away, and the coil to be solidified is replaced to complete a cycle.

[0024] Solution method 2 (the coil is not allowed to stay in the water pool for a long time) The coil is loaded into the furnace through the turning mechanism. The forklift waits at the furnace door. After the coil completes the heating and insulation process, the one-button start function is activated. The forklift takes the coil out of the solid solution furnace and quickly puts it into the water pool. Since the coil is not allowed to cool in the water pool for a long time, generally 30 seconds, after cooling for 30 seconds, the forklift lifts the coil and moves it to the turning mechanism. The forklift moves forward to put the coil on the transition platform. The forklift retreats to the turning mechanism to take the material and moves it to the solid solution furnace for loading. After loading, the forklift goes to the turning mechanism to lift the coil on the transition platform and retreats to the turning mechanism to put the coil on the turning mechanism. The forklift retreats to the solid solution furnace door and waits for the next furnace. The coil of the turning mechanism is manually lifted away and the coil to be solid solution is replaced to complete a cycle.

[0025] Solution method 3 (no need to cool in water after coil heating, air cooling) The coil is loaded into the furnace through the turning mechanism, and the forklift waits at the furnace door. After the coil completes the heating and insulation process, the one-button start function is activated. The forklift takes the coil out of the solid solution furnace and quickly puts it on the support seat at the bottom of the water pool (the water in the water pool is completely emptied, and the furnace is empty). The forklift retreats and rises to the turning mechanism to take the material, and moves it horizontally to the solid solution furnace for loading. After loading, the forklift goes to the bottom of the water pool and lifts the coil on the support seat in an air-cooled state and moves it horizontally to the turning mechanism to place the coil on the turning mechanism. The forklift withdraws to the door of the solid solution furnace and waits for the next furnace. When the coil is air-cooled at the turning mechanism to be ready for lifting, the coil of the turning mechanism is manually lifted away and the coil to be solid solution is replaced to complete a cycle.

[0026] Key process parameters: The design temperature of the solution furnace is 1250℃, the single furnace can dissolve 2 coils, the maximum coil weight is about 1.5 tons, and the maximum height of a single coil is 1400mm; The loading and unloading forklift has realized manual, fully automatic and one-button start functions. The measured coil immersion time is 24 seconds, which meets the quenching process requirements (within 30 seconds). The loading time is reduced from the original 30 minutes to 5 minutes.

[0027] In one embodiment, the solution heat treatment process is as follows The loading and unloading mechanism lifts the vertical coil from the coil turning machine and loads it into the solid solution furnace, and then stops above the water pool and waits; at the same time, the coil to be solid-solutionized at the coil turning machine is in a vertical state waiting to be loaded into the furnace.

[0028] When the coil is heated to the state ready for removal from the furnace according to the process requirements, the furnace door automatically opens 300mm and the removal mechanism is installed to automatically take the coil (when the furnace door is opened about 300mm, the lower part of the furnace door is basically flush with the furnace bottom. In this state, the furnace temperature loss is not large and will not affect the temperature drop before entering the water). The coil is placed in the water pool within 25 seconds.

[0029] The trolley moves from the initial position at the furnace door to the solid solution furnace. After reaching the position, it lifts up the coil in the furnace (lifting stroke 100mm~200mm); after the furnace door rises to the position signal is given, the coil is transported out of the solid solution furnace to above the water pool; the lifting mechanism descends quickly to place the coil on the support seat under the water pool for rapid water cooling, and the furnace door is closed at the same time.

[0030] According to the process requirements of different steel grades, two operations are carried out. The first is that the coil can be placed in the water for a long time. The bracket of the furnace loading mechanism drops away from the coil and moves backward. After completely leaving the coil, it rises above the height of the water pool and moves horizontally to the position of the coiler. The coil to be solid-solution is lifted and then loaded horizontally into the furnace. The furnace door is closed for heating and solid-solution. After the coil in the water pool is completely cooled, the furnace loading mechanism automatically lifts the coil from the water, moves the trolley running mechanism to the coiler station, places the coil on the coiler, and the trolley runs to the top of the water pool to wait for the next furnace operation. The coiler flips the coil to a horizontal position. After the overhead crane is lifted away, another coil to be solid-solution is lifted to the flipper and flipped to a vertical position at the same time. It is in a state of waiting for solid-solution and waits for the next work cycle. The second is that the coil is placed in the water for no more than 1 minute, the bracket of the furnace loading mechanism is directly raised, the coil is lifted and then raised above the height of the pool, and then moved horizontally to the position of the coiler, the coil is placed on the transition table, and then returned to the position of the coiler, the coil to be solid-solution is lifted and then moved horizontally into the furnace, and the furnace door is closed for heating and solid-solution. The furnace loading mechanism automatically returns to the transition table position to lift the coil, and the trolley running mechanism is moved horizontally to the coiler station, and the coil is placed on the coiler. The trolley runs above the pool and waits for the next furnace operation. The coiler flips the coil to a horizontal position. After the overhead crane is lifted away, another coil to be solid-solution is lifted to the flipper, and at the same time flipped to a vertical position, in a state of waiting for solid-solution, waiting for the next work cycle.

[0031] The loading and unloading mechanism and the solid solution furnace heating are started with one button, and are fully automatically controlled. According to different processes, the heating temperature and curve can be set in advance, and the cooling time of the solid solution coil in water can be set to meet the needs of different processes.

[0032] The forklift forward and backward moving trolley adopts variable frequency motor reducer, with a speed of 0-800mm / s, and the forklift lifting cylinder has an ascending speed of 0-150mm / s and a descending speed of 0-400mm / s. By optimizing the parameters such as the furnace body, forklift, and pool depth, the timing of the furnace door opening and forklift forward movement is controlled to minimize the action time.

[0033] When the furnace door opens, the forklift trolley moves at the same time. About 3s after the furnace door moves (the furnace door opens about 300mm), the trolley has been moving for 3s (about 300mm away from the furnace mouth). At this time, the timing starts. The trolley speed is 600mm / S, the running distance is 2200mm (300+300+250+1350), and the running time is 2200 / 600=4S.

[0034] The material fork is slowly raised and lowered by 100mm at a speed of 100mm / s, taking 3s (including a start-stop buffer of 2s).

[0035] 1s after the fork lifting action is in place, the trolley starts to move backward with a backward stroke of 2500mm and a total running time of 6s (including a start-stop buffer of 2s).

[0036] After the trolley moves backward for 6 seconds, the material fork descends rapidly at a speed of ~400mm / s, and the total travel circle is 1400 (workpiece) + 100 (fork height) + 1500 (pool depth) = 3000mm. It descends again after the water entry timing ends. The effective calculation is sometimes 3000 / 400+1=9s (including 1s start-stop buffer).

[0037] The total time required for all workpieces to enter the water is: 3+4+1+6+9=23s.

[0038] One embodiment is a solution heat treatment method for 0Cr25Al5-1 stainless steel wire rod with a diameter of Φ5.5 mm.

[0039] 1. Coil preparation The hot-sent billet is heated in a heating furnace, rolled, and packaged online with four bundling lines. The coil weight is 1305kg.

[0040] 2. Coil heating Set the solution process in advance, heat the cold furnace to 820℃, then load the coil, heat to 820℃ and start heat preservation for 2 hours. The horizontal coil is flipped to a vertical state by the flipping mechanism, and the coil is lifted and placed in the solution furnace by the loading and unloading mechanism, and heated and kept warm according to the established process.

[0041] 3. Solution heat treatment of coils After the coil has completed the heating and insulation process, the alarm installed on the forklift for loading and unloading the furnace will sound an alarm. When it is confirmed that it is ready to be unloaded from the furnace, the heating and insulation process will be stopped, the furnace door will be quickly opened, and the forklift will quickly enter to lift the coil and move it out of the furnace body. It takes 23 seconds from the opening of the furnace door to the rapid placement of the coil in water. The furnace door is closed and the coil to be dissolved is reloaded.

[0042] 4. Collection of coils Lift the coil from the water, move it above the turning mechanism, place it on the turning mechanism tray, turn it over to a horizontal position, lift the coil away with the overhead crane and C-hook, and re-lift the coil to be solid-solutionized.

[0043] 5. Coil quality after heat treatment After the heat treatment process, the performance indicators of 0Cr25Al5-1 stainless steel coil after solution heat treatment, such as grain size and intergranular corrosion resistance, have reached high standards. The grain size difference at each point is less than 2 levels, and the material organization and composition are uniform.

[0044] In one embodiment, a solution heat treatment method is provided for ER307Si stainless steel wire rod with a diameter of Φ5.5 mm.

[0045] 1. Coil preparation The billet is heated in a heating furnace, rolled, and packaged online with four bundling lines. The coil weight is 1259kg.

[0046] 2. Coil heating Set the solution process in advance, heat the cold furnace to 1050℃, then load the coil, heat to 1050℃ and start heat preservation for 0.5 hours. The horizontal coil is flipped to a vertical state by the flipping mechanism, and the coil is lifted and placed in the solution furnace by the loading and unloading mechanism, and heated and kept warm according to the established process.

[0047] 3. Solution heat treatment of coils After the coil has completed the heating and insulation process, the alarm installed on the forklift will sound. When it is confirmed that it is ready to be taken out of the furnace, the heating and insulation process will be stopped, the furnace door will be opened quickly, and the forklift will quickly enter to lift the coil and move it out of the furnace. The time from the furnace door opening to the rapid and complete immersion in water is 24 seconds. The furnace door is closed, and the coil does not leave the forklift in the water. Wait for 25 seconds before lifting the coil out of the solid solution water tank.

[0048] 4. Collection of coils Lift the coil from the water, move it above the turning mechanism, move it horizontally to the transition table, put the coil on the transition table, and then lift the forklift back to the top of the turning mechanism to load the material to be dissolved. Then move the coil on the transition table to the turning mechanism tray, turn it to a horizontal position, lift it away with the overhead crane and C-hook, and re-lift the coil to be dissolved.

[0049] 5. Coil quality after heat treatment After the heat treatment process, the performance indicators of ER307Si stainless steel coil after solution heat treatment, such as grain size and intergranular corrosion resistance, have reached high standards, eliminating the material processing hardness and greatly improving the material's heat treatment performance.

[0050] The present invention is applicable to the heat treatment method of high-end wire rods such as 316, 308, nickel-based alloys, iron-chromium-aluminum, etc., and all specifications of Φ5.5-Φ20 can be used. Before solution heat treatment, it needs to be packaged into bundles with four bundle lines. The selection of the furnace body structure and heating elements of the solution furnace (HYZ material resistance belt) ensures the accuracy of furnace temperature control and the stability of heating, and the maximum temperature can reach 1250°C. The loading and unloading mechanism adopts the form of a forklift, which moves in three dimensions and six directions, quickly enters and exits the furnace to take materials, and quickly enters the water for cooling, ensuring that the water entry time is less than 25s. The reasonable arrangement of the furnace body, water tank, forklift, turning mechanism, and transition table realizes the function of one loading and unloading forklift sharing two or more furnaces. Adding a transition table at the same position in the furnace area can realize two different process methods. The one-key operation of solution heat treatment realizes the processes of loading and unloading, dipping in water, etc. By setting parameters, the heating and insulation curves of different steel grades and the water entry and cooling time can be realized to meet the production of wire rods with multiple processes. At the same time, the production output is greatly improved and the energy cost is significantly reduced.

[0051] The above description is only a specific embodiment of the present invention, but the structural features of the protection scope of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are all covered by the patent scope of the present invention.

Claims

1. A method for solution heat treatment of high-end coil products, characterized in that: Firstly, the temperature and stability of the solution furnace are improved, and the maximum temperature can be greater than 1400℃; secondly, the layout idea of ​​using two furnace bodies to share the loading and unloading forklift and the turning mechanism is adopted to reduce the equipment footprint and cost. At the same time, a transition platform is set in the parallel position of the furnace body opposite the turning mechanism to realize multi-process production selection. The loading and unloading forklift adopts fully automatic control, and the time from starting the furnace door to entering the water is less than 25 seconds.

2. A method for solution heat treatment of high-end coiled products according to claim 1, characterized in that: The method for improving the temperature and stability of the solid solution furnace is that the resistance belt of the solid solution furnace adopts the resistance belt made of Shougang HYZ material, so that the solid solution furnace can operate stably at a furnace temperature of 1200-1400°C, the electric control power regulation is stable, the heating efficiency of the solid solution furnace is high, and the heating time is 2.5 hours when the furnace is cold and waiting for material, and the furnace temperature control accuracy is high.

3. A method for solution heat treatment of high-end coiled products according to claim 1, characterized in that: The coil is loaded into the furnace through the turning mechanism. The forklift waits at the furnace door. After the coil completes the heating and insulation process, the one-button start function is activated. The forklift takes the coil out of the solid solution furnace and quickly puts it on the support seat at the bottom of the water pool. The forklift moves back and rises to the turning mechanism to take the material, and moves it horizontally to the solid solution furnace for loading. After loading, the forklift goes to the bottom of the water pool and lifts the cooled coil on the support seat and moves it horizontally to the turning mechanism. The coil is placed on the turning mechanism, and the forklift withdraws to the solid solution furnace door and waits for the next furnace. The coil of the turning mechanism is manually lifted away, and the coil to be solidified is replaced to complete a cycle.

4. A method for solution heat treatment of high-end coiled products according to claim 1, characterized in that: The coil is loaded into the furnace through the turning mechanism, and the forklift waits at the furnace door. After the coil completes the heating and insulation process, the one-button start function is activated. The forklift takes the coil out of the solid solution furnace and quickly puts it into the water pool. The coil is not allowed to cool in the water pool for a long time. After cooling for 30 seconds, the forklift lifts the coil and moves it to the turning mechanism. The forklift moves forward to place the coil on the transition table, the forklift retreats to the turning mechanism to take the material, and moves it to the solid solution furnace for loading. After loading, the forklift goes to the turning mechanism to lift the coil on the transition table, retreats to the turning mechanism, and places the coil on the turning mechanism. The forklift retreats to the solid solution furnace to wait for the next furnace exit. The coil of the turning mechanism is manually lifted away, and the coil to be solidified is replaced to complete a cycle.

5. A method for solution heat treatment of high-end coiled products according to claim 1, characterized in that: The coil is loaded into the furnace through the turning mechanism, and the forklift waits at the furnace door. After the coil completes the heating and insulation process, the one-button start function is activated. The forklift takes the coil out of the solid solution furnace and quickly puts it on the support seat at the bottom of the water pool. The forklift retreats and rises to the turning mechanism to pick up the material, and moves it horizontally to the solid solution furnace for loading. After loading, the forklift goes to the bottom of the water pool and lifts the coil in the air-cooled state on the support seat and moves it horizontally to the turning mechanism to place the coil on the turning mechanism. The forklift withdraws to the door of the solid solution furnace and waits for the next time to be taken out of the furnace. When the coil is air-cooled at the turning mechanism to be ready for lifting operation, the coil of the turning mechanism is manually lifted away and the coil to be solid solution is replaced to complete a cycle.