Copper-manganese flat belt for shunt and preparation method of copper-manganese flat belt
Through the combined process of medium-frequency smelting and forging, the problems of large resistivity fluctuations and difficult to control the components in the preparation of copper-manganese alloy strips are solved, and high-quality and low-cost copper-manganese strips are achieved, which meets the performance requirements of precision shunts.
Patent Information
- Application Number
- CN202411897997.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-03-28
AI Technical Summary
In the existing copper-manganese alloy strip preparation process, the resistivity performance fluctuates greatly and cracks occur, the cost is high, and the components are difficult to control.
The medium-frequency smelting process is used for forging, the smelting temperature is controlled to be 1200-1300℃, and hot rolling is carried out at 800-850℃, combined drawing and process annealing, followed by triple rolling and re-annealing, and finally the finished product heat treatment is carried out at 750-850℃.
It improves the quality of the copper manganese flat belt, reduces the level of impurity defects, ensures the controllability of the components, reduces costs, improves the strength and hardness of the flat belt, and meets the use needs of precision shunts.
Smart Images
Figure CN119710331A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of copper-manganese alloys, and in particular to a copper-manganese flat strip for a diverter and a preparation method thereof. Background Art
[0002] Copper-manganese alloy is very suitable for making ultra-high pressure sensors due to its high sensitivity, fast response, good linearity and small resistance temperature coefficient. It is widely used in pressure measurement in dynamic high-pressure environments. Precision shunts are often produced using copper-manganese alloy. Copper-manganese alloy flat strip materials have the advantages of small dimensional tolerance, small resistivity change, and small resistance temperature coefficient, which ensures high-precision current detection under high current working conditions. It is particularly suitable for battery management systems, power electronic equipment current detection and other high-precision application fields. At present, the preparation of copper-manganese alloy flat strips mostly adopts horizontal continuous casting to produce copper-manganese rods, followed by drawing and triple rolling. However, the resistivity performance of the copper-manganese alloy flat strips prepared by this process fluctuates greatly, and there is obvious cracking during the triple rolling process; some processes also use vacuum melting ingots, forging, hot rolling, peeling, drawing and triple rolling, but the copper-manganese alloy flat strips prepared by them are difficult to control the composition due to the easy burning of manganese elements, and the cost is too high. Based on this, the present application proposes a copper-manganese flat strip for shunts and a preparation method thereof. Summary of the invention
[0003] The main purpose of the present application is to provide a copper-manganese flat strip for a diverter and a preparation method thereof, aiming to solve the technical problem that the copper-manganese alloy flat strip prepared by the existing method has a high defect level.
[0004] To achieve the above purpose, the present application proposes a method for preparing a copper-manganese flat strip for a diverter, comprising the following steps:
[0005] The ingredients are prepared according to the composition requirements of the copper-manganese flat strip, and medium-frequency smelting is performed at a smelting temperature of 1200-1300°C. After smelting, a copper-magnesium intermediate alloy is added for deoxidation, and then casting is performed to obtain a copper-manganese alloy ingot;
[0006] The copper-manganese alloy ingot is subjected to machining treatment and then forged at 800-870° C. to obtain a copper-manganese rod;
[0007] The copper-manganese rod material is hot-rolled at 800-850° C. to obtain a copper-manganese rod material;
[0008] The copper-manganese rod material is subjected to a combined drawing process and then to a process annealing process to obtain a semi-finished flat strip;
[0009] The semi-finished flat strip is subjected to triple rolling and re-annealing treatment, and then fine-drawn according to a flat die mold, and then subjected to a finished product heat treatment at 750-850° C. to obtain a finished copper-manganese flat strip.
[0010] Optionally, in the step of preparing ingredients according to the composition requirements of the copper-manganese flat strip, copper plates, electrolytic manganese, electrolytic nickel and tin ingots are used for preparation according to a ratio of Mn content of 11-13%, Ni content of 2-3%, Sn content of 0.6-1%, Fe content ≤0.1% and Cu as the balance.
[0011] Optionally, the step of performing medium frequency smelting processing includes:
[0012] The electrolytic manganese, the copper plate, the electrolytic nickel and the tin ingot are sequentially added into a medium frequency furnace for smelting processing, and a covering agent is added for covering protection. The temperature is raised to 1200-1300° C. in stages, and the copper plate is refined for 10-15 minutes after being melted to obtain a raw material melt.
[0013] Optionally, the step of adding a copper-magnesium master alloy for deoxidation and then casting comprises:
[0014] Add copper-magnesium master alloy to the raw material melt, the copper-magnesium master alloy added in an amount of 0.03-0.05% of the raw material melt mass, stir for 0.8-1.2h at a temperature of 1100-1200°C, a stirring speed of 40-45r / min, and then use a steel mold for casting, and the casting time is controlled within 5-10min.
[0015] Optionally, the step of machining the copper-manganese alloy ingot comprises:
[0016] The riser and bottom plate of the copper-manganese alloy ingot are sawn, and then the outer circle is turned to light treatment.
[0017] Optionally, in the step of forging at 800-870° C. to obtain the copper-manganese rod, the forging time is 60-90 min, and the forging size of the copper-manganese rod is Φ85-Φ90 mm.
[0018] Optionally, in the step of hot rolling the copper-manganese rod material at 800-850° C. to obtain a copper-manganese rod material, the holding time of the hot rolling treatment is 60-90 min, and the size of the copper-manganese rod material is Φ12-Φ13 mm.
[0019] Optionally, the step of subjecting the copper-manganese rod material to a combined drawing process and then to a process annealing process to obtain a semi-finished flat strip comprises:
[0020] The copper-manganese rod material is drawn, peeled and re-drawn by using a combined drawing machine, and the deformation is controlled to be less than 30% to obtain a rod blank;
[0021] The rod blank is then placed in a heating furnace and kept at 800-900° C. for 60-90 minutes for annealing. After cooling in the furnace, a semi-finished flat strip is obtained.
[0022] Optionally, the step of subjecting the semi-finished flat strip to triple rolling and re-annealing, and then fine drawing according to a flat die mold, and then subjecting the finished product to heat treatment at 750-850° C. to obtain a finished copper-manganese flat strip comprises:
[0023] After the semi-finished flat strip is subjected to triple rolling, it is loaded into a heating furnace, kept at 800-900°C for 60-90 minutes, and then subjected to re-annealing treatment. After cooling in the furnace, it is subjected to fine drawing treatment using a flat die of the target flat strip specification, and then subjected to finished product heat treatment at 750-850°C for 60-90 minutes. After cooling, a finished copper-manganese flat strip is obtained.
[0024] The present application also proposes a copper-manganese flat strip for a diverter, which is obtained by using the preparation method of the copper-manganese flat strip for a diverter.
[0025] This application includes at least the following beneficial effects:
[0026] The present application first prepares the ingredients according to the required copper-manganese flat strip composition, and then performs medium frequency smelting processing. Since the internal structure of the rod material produced by horizontal continuous casting is loose, loose defects can be clearly observed in the metallographic structure, and bamboo knots will exist during the horizontal continuous casting process, and then crack defects will occur. The vacuum smelting ingot is prone to burnout of manganese elements, making it difficult to control the product composition. Therefore, the present application adopts the method of medium frequency smelting and then forging, and controls the smelting temperature to 1200-1300°C. It heats the metal based on electromagnetic induction, and the temperature rises and melts quickly. It does not require a molten block and residual molten metal. It only needs to add scraps or small materials for smelting, which can ensure the most optimized and stable melting process, make the product composition controllable, and reduce the damage of the product composition during the smelting process, avoid the doping of impurities when the raw materials are melted, so as to ensure the purity of the internal structure of the raw material melt, thereby reducing the impurity defects on the surface and inside of the finished copper-manganese flat strip, effectively improving the quality of the finished copper-manganese flat strip, and before casting. Copper-magnesium master alloy is added for deoxidation. Since magnesium and oxygen can react violently at the melting temperature, the oxygen is removed by reacting the copper-magnesium master alloy with oxygen, which can avoid the generation of impurities after the metal raw material reacts with oxygen. Then, hot rolling treatment is carried out at a high temperature of 800-850°C to ensure the complete occurrence of dynamic recrystallization of the metal components in the copper-manganese rod material, improve the internal structure of the metal, and thus reduce the impurity defect level of the copper-manganese flat strip. Then, through combined drawing, the copper-manganese rod material is rolled into a suitable flat strip size. Then, through process annealing treatment, the excess phase is fully dissolved into the solid solution to obtain a supersaturated solid solution to improve the internal structure of the flat strip. Then, triple rolling processing and re-annealing treatment are carried out to further improve the plasticity and toughness of the flat strip, eliminate the precipitates on the cast structure, reduce brittleness, and then fine drawing treatment is carried out, and then heat treatment is carried out at 750-850°C to optimize the organizational structure and performance of the flat strip, thereby improving the strength and hardness of the flat strip. Compared with the traditional preparation process, the preparation cost of the present application is low, the material utilization rate is high, the process is simple, the components of the obtained copper-manganese flat strip are evenly distributed, there is less component segregation, there is no manganese element burn-out phenomenon, the impurity defect level is low, the internal structure is uniform, there is no looseness and cracks, it has excellent mechanical properties, and can meet the use requirements of precision diverters. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. It is obvious that the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0028] Figure 1 This is a flow chart of a method for preparing the copper-manganese flat strip for the diverter described in an embodiment of the present application.
[0029] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0031] In view of the technical problems existing in the prior art, the embodiments of the present application provide a method for preparing a copper-manganese flat strip for a diverter, such as Figure 1 As shown, the following steps are included:
[0032] The ingredients are prepared according to the composition requirements of the copper-manganese flat strip, and medium-frequency smelting is performed at a smelting temperature of 1200-1300°C. After smelting, a copper-magnesium intermediate alloy is added for deoxidation, and then casting is performed to obtain a copper-manganese alloy ingot;
[0033] The copper-manganese alloy ingot is subjected to machining treatment and then forged at 800-870° C. to obtain a copper-manganese rod;
[0034] The copper-manganese rod material is hot-rolled at 800-850° C. to obtain a copper-manganese rod material;
[0035] The copper-manganese rod material is subjected to a combined drawing process, and then an annealing process is performed to obtain a semi-finished flat strip;
[0036] The semi-finished flat strip is subjected to triple rolling and re-annealing treatment, and then fine-drawn according to a flat die mold, and then subjected to a finished product heat treatment at 750-850° C. to obtain a finished copper-manganese flat strip.
[0037] The present application first prepares the ingredients according to the required copper-manganese flat strip composition, and then performs medium frequency smelting processing. Since the internal structure of the rod material produced by horizontal continuous casting is loose, loose defects can be clearly observed in the metallographic structure, and bamboo knots will exist during the horizontal continuous casting process, and then crack defects will occur. The vacuum smelting ingot is prone to burnout of manganese elements, making it difficult to control the product composition. Therefore, the present application adopts the method of medium frequency smelting and then forging, and controls the smelting temperature to 1200-1300°C. It heats the metal based on electromagnetic induction, and the temperature rises and melts quickly. It does not require a molten block and residual molten metal. It only needs to add scraps or small materials for smelting, which can ensure the most optimized and stable melting process, make the product composition controllable, and reduce the damage of the product composition during the smelting process, avoid the doping of impurities when the raw materials are melted, so as to ensure the purity of the internal structure of the raw material melt, thereby reducing the impurity defects on the surface and inside of the finished copper-manganese flat strip, effectively improving the quality of the finished copper-manganese flat strip, and before casting. Copper-magnesium master alloy is added for deoxidation. Since magnesium and oxygen can react violently at the melting temperature, the oxygen is removed by reacting the copper-magnesium master alloy with oxygen, which can avoid the generation of impurities after the metal raw material reacts with oxygen. Then, hot rolling treatment is carried out at a high temperature of 800-850°C to ensure the complete occurrence of dynamic recrystallization of the metal components in the copper-manganese rod material, improve the internal structure of the metal, and thus reduce the impurity defect level of the copper-manganese flat strip. Then, through combined drawing, the copper-manganese rod material is rolled into a suitable flat strip size. Then, through process annealing treatment, the excess phase is fully dissolved into the solid solution to obtain a supersaturated solid solution to improve the internal structure of the flat strip. Then, triple rolling processing and re-annealing treatment are carried out to further improve the plasticity and toughness of the flat strip, eliminate the precipitates on the cast structure, reduce brittleness, and then fine drawing treatment is carried out, and then heat treatment is carried out at 750-850°C to optimize the organizational structure and performance of the flat strip, thereby improving the strength and hardness of the flat strip. Compared with the traditional preparation process, the preparation cost of the present application is low, the material utilization rate is high, the process is simple, the components of the obtained copper-manganese flat strip are evenly distributed, there is less component segregation, there is no manganese element burn-out phenomenon, the impurity defect level is low, the internal structure is uniform, there is no looseness and cracks, it has excellent mechanical properties, and can meet the use requirements of precision diverters.
[0038] As an implementable embodiment of the present application, in the step of preparing ingredients according to the composition requirements of the copper-manganese flat strip, copper plates, electrolytic manganese, electrolytic nickel and tin ingots are used for preparation according to the ratio of Mn content of 11-13%, Ni content of 2-3%, Sn content of 0.6-1%, Fe content ≤0.1% and Cu as the balance.
[0039] In the specific implementation process, the present application uses high-purity copper plates, electrolytic manganese sheets, electrolytic nickel and tin ingots as raw materials for proportioning, and adjusts the composition of the copper-manganese flat strip to make the copper-manganese flat strip have excellent resistivity, which can reduce and stabilize the resistance temperature coefficient, and ensure that the resistivity of the obtained copper-manganese flat strip remains in a relatively constant state, so as to avoid the problem of large fluctuations in its resistivity performance.
[0040] As an implementable method of the present application, the step of performing medium frequency smelting processing includes:
[0041] The electrolytic manganese, the copper plate, the electrolytic nickel and the tin ingot are sequentially added into a medium frequency furnace for smelting processing, and a covering agent is added for covering protection. The temperature is raised to 1200-1300° C. in stages, and the copper plate is refined for 10-15 minutes after being melted to obtain a raw material melt.
[0042] Specifically, the covering agent is charcoal. By adding the covering agent for covering protection, the loss of product components in the smelting process can be reduced, and the doping of impurities when the metal raw materials are melted can be avoided, thereby ensuring the purity of the internal structure of the raw material melt, thereby reducing impurity defects on the surface and inside of the finished flat strip, and effectively improving the quality of the copper-manganese flat strip.
[0043] As an implementation method of the present application, the step of adding a copper-magnesium master alloy for deoxidation and then casting comprises:
[0044] Add copper-magnesium master alloy to the raw material melt, the copper-magnesium master alloy added in an amount of 0.03-0.05% of the raw material melt mass, stir for 0.8-1.2h at a temperature of 1100-1200°C, a stirring speed of 40-45r / min, and then use a steel mold for casting, and the casting time is controlled within 5-10min.
[0045] Specifically, the casting speed will directly affect the contact time between the raw material melt and the casting steel mold, thereby affecting the temperature distribution of the casting. A reasonable casting speed can avoid defects such as cold shut and incomplete pouring, and at the same time prevent the product from being heated for a long time. Sand falling defects, so this application controls the casting time within 5-10 minutes to ensure a suitable casting speed.
[0046] As an implementable method of the present application, the step of machining the copper-manganese alloy ingot comprises:
[0047] The riser and bottom plate of the copper-manganese alloy ingot are sawn, and then the outer circle is turned to light treatment.
[0048] Specifically, the present application can avoid defects on the surface of the copper-manganese alloy ingot after smelting by sawing the riser and the bottom plate of the copper-manganese alloy ingot and turning the surface to a bright outer circle before forging, thereby avoiding affecting the product quality of the copper-manganese flat strip.
[0049] As an implementable embodiment of the present application, in the step of forging at 800-870° C. to obtain the copper-manganese rod, the forging time is 60-90 min, and the forging size of the copper-manganese rod is Φ85-Φ90 mm.
[0050] Specifically, the present application can use a box-type resistance furnace for heating and forging, the forging temperature is preferably 835° C., and the forging time is preferably 75 minutes, so that a copper-manganese rod with a dense structure and uniform composition can be obtained.
[0051] As an implementation method of the present application, in the step of hot rolling the copper-manganese rod material at 800-850°C to obtain the copper-manganese rod material, the holding time of the hot rolling treatment is 60-90 minutes, and the size of the copper-manganese rod material is Φ12-Φ13mm.
[0052] Specifically, the present application performs hot rolling treatment at a temperature of 800-850°C for 60-90 minutes, which can ensure the complete occurrence of dynamic recrystallization of the metal components in the copper-manganese rod, thereby improving the internal structure of the copper-manganese alloy and reducing the occurrence of casting defects, component segregation and other problems.
[0053] As an implementation method of the present application, the step of subjecting the copper-manganese rod material to a combined drawing process and then to a process annealing process to obtain a semi-finished flat strip includes:
[0054] The copper-manganese rod material is drawn, peeled and re-drawn by using a combined drawing machine, and the deformation is controlled to be less than 30% to obtain a rod blank;
[0055] The rod blank is then placed in a heating furnace and kept at 800-900° C. for 60-90 minutes for annealing. After cooling in the furnace, a semi-finished flat strip is obtained.
[0056] Specifically, the combined drawing machine is mainly composed of a main machine, a transmission system, a die, a lubrication system, a hydraulic system, an electrical control system, etc. Among them, the main machine is the core part of the drawing operation, the transmission system is responsible for driving the main machine to operate, the die is the key component to achieve the drawing and deformation of the metal billet, the lubrication system is used to reduce the friction resistance between the metal billet and the die, the hydraulic system controls the opening and closing of the die and the flow of lubricating oil, and the electrical control system controls the operation and production process of the entire equipment. Through the combined drawing machine, different drawing dies and peeling dies can be used for drawing and peeling. Through combined drawing, the quality and production efficiency of the products can be greatly improved, and bars of suitable sizes can be produced.
[0057] In addition, since excessive drawing deformation of the material will cause serious damage to the microstructure of the material, and excessive deformation will easily break the material, the deformation is controlled to less than 30% in this application.
[0058] As an implementation method of the present application, the step of performing triple rolling and re-annealing on the semi-finished flat strip, and then performing fine drawing according to a flat die mold, and then performing a finished product heat treatment at 750-850° C. to obtain a finished copper-manganese flat strip includes:
[0059] After the semi-finished flat strip is subjected to triple rolling, it is loaded into a heating furnace, kept at 800-900°C for 60-90 minutes, and then subjected to re-annealing treatment. After cooling in the furnace, it is subjected to fine drawing treatment using a flat die of the target flat strip specification, and then subjected to finished product heat treatment at 750-850°C for 60-90 minutes. After cooling, a finished copper-manganese flat strip is obtained.
[0060] In the specific implementation process, it is preferred to heat treat the finished product at 800°C for 75 minutes, which can make the microstructure of the copper-manganese flat strip more stable and avoid the defect of loose internal structure, thereby ensuring the product quality of the copper-manganese flat strip.
[0061] The embodiment of the present application further provides a copper-manganese flat strip for a diverter, which is obtained by using the preparation method of the copper-manganese flat strip for a diverter described above.
[0062] The above technical solution of the present application is described in detail below in conjunction with specific embodiments.
[0063] Example 1
[0064] A method for preparing a copper-manganese flat strip for a diverter comprises the following steps:
[0065] Copper plate, electrolytic manganese, electrolytic nickel and tin ingot are used as raw materials, and the ingredients are prepared according to the ratio of Mn content of 12%, Ni content of 2.5%, Sn content of 0.8%, Fe content of ≤0.1% and Cu as the balance, and the electrolytic manganese, copper plate, electrolytic nickel and tin ingot are sequentially added into a medium frequency furnace for smelting and processing, and charcoal as a covering agent is added for covering and protection, and the mixture is heated at a power of 50 kW for 0.5 h, and then the power is increased to 100 kW and heated for 0.5 h, and then the power is increased to 150 kW and heated for 2 h, and the detection temperature is 1250° C. After the copper plate is melted, it is refined for 13 min to obtain a raw material melt, and a copper-magnesium intermediate alloy is added into the raw material melt, and the copper-magnesium intermediate alloy is added in an amount of 0.04% of the raw material melt mass, and the mixture is stirred for 1 h at a temperature of 1150° C., and the stirring speed is 42 r / min, and then a steel mold is used for casting, and the casting time is controlled within 8 min to obtain a copper-manganese alloy ingot;
[0066] The riser and bottom plate of the copper-manganese alloy ingot are sawn, and then the outer circle is turned to light treatment, and then forged at 835° C. for 75 minutes to obtain a copper-manganese rod material, and the forging size of the copper-manganese rod material is Φ87 mm;
[0067] The copper-manganese rod material is hot-rolled at 825° C. for 75 minutes to obtain a copper-manganese rod material, wherein the size of the copper-manganese rod material is Φ12 mm;
[0068] The copper-manganese rod material is drawn, peeled and re-drawn by a combined drawing machine, and the deformation is controlled to be less than 30%, so as to obtain a rod blank of Φ4 mm;
[0069] The rod blank is then placed in a heating furnace and kept at 850° C. for 75 minutes for annealing, and then cooled in the furnace to obtain a semi-finished flat strip;
[0070] After the semi-finished flat strip is subjected to triple rolling processing, it is loaded into a heating furnace, kept at 850°C for 75 minutes, and then subjected to re-annealing treatment. After cooling in the furnace, it is subjected to finish drawing treatment using a flat die mold of the target flat strip specification, and then kept at 800°C for 75 minutes for finished product heat treatment. After cooling, a 2×4mm finished copper-manganese flat strip is obtained.
[0071] Example 2
[0072] A method for preparing a copper-manganese flat strip for a diverter comprises the following steps:
[0073] Copper plate, electrolytic manganese, electrolytic nickel and tin ingot are used as raw materials, and the ingredients are prepared according to the ratio of Mn content of 11%, Ni content of 2%, Sn content of 0.6%, Fe content of ≤0.1% and Cu as the balance, and the electrolytic manganese, copper plate, electrolytic nickel and tin ingot are sequentially added into a medium frequency furnace for smelting and processing, and charcoal as a covering agent is added for covering and protection, and heated at a power of 50kw for 0.5h, and then the power is increased to 100kw and heated for 0.5h, and then the power is increased to 150kw and heated for 2h, and the detection temperature is 1200℃, and after the copper plate is melted, it is refined for 15min to obtain a raw material melt, and a copper-magnesium intermediate alloy is added into the raw material melt, and the copper-magnesium intermediate alloy is added in an amount of 0.03% of the raw material melt mass, and stirred for 1.2h at a temperature of 1100℃, and the stirring speed is 40r / min, and then cast by a steel mold, and the casting time is controlled within 10min to obtain a copper-manganese alloy ingot;
[0074] The riser and bottom plate of the copper-manganese alloy ingot are sawn, and then the outer circle is turned to light treatment, and then forged at 800° C. for 90 minutes to obtain a copper-manganese bar material, and the forging size of the copper-manganese bar material is Φ85 mm;
[0075] The copper-manganese rod material is hot-rolled at 800° C. for 90 minutes to obtain a copper-manganese rod material, the size of the copper-manganese rod material is Φ12 mm;
[0076] The copper-manganese rod material is drawn, peeled and re-drawn by a combined drawing machine, and the rolling deformation is controlled to be less than 30%, so as to obtain a Φ5mm rod blank;
[0077] Then the rod blank is placed in a heating furnace, kept at 800°C for 90 minutes, subjected to process annealing treatment, and then cooled in the furnace to obtain a semi-finished flat strip;
[0078] After the semi-finished flat strip is subjected to triple rolling, it is loaded into a heating furnace and kept at 800°C for 90 minutes for re-annealing. After cooling in the furnace, it is fine-drawn using a flat die of the target flat strip specification, and then kept at 750°C for 90 minutes for finished product heat treatment. After cooling, a 2×5mm finished copper-manganese flat strip is obtained.
[0079] Example 3
[0080] A method for preparing a copper-manganese flat strip for a diverter comprises the following steps:
[0081] Copper plate, electrolytic manganese, electrolytic nickel and tin ingot are used as raw materials, and the ingredients are prepared according to the ratio of Mn content of 13%, Ni content of 3%, Sn content of 1%, Fe content of ≤0.1% and Cu as the balance, and the electrolytic manganese, copper plate, electrolytic nickel and tin ingot are sequentially added into a medium frequency furnace for smelting and processing, and charcoal as a covering agent is added for covering and protection, and the mixture is heated at a power of 50 kW for 0.5 h, and then the power is increased to 100 kW and heated for 0.5 h, and then the power is increased to 150 kW and heated for 2 h, and the detection temperature is 1300° C. After the copper plate is melted, it is refined for 10 min to obtain a raw material melt, and a copper-magnesium intermediate alloy is added into the raw material melt, and the copper-magnesium intermediate alloy is added in an amount of 0.05% of the raw material melt mass, and the mixture is stirred for 0.8 h at a temperature of 1200° C., and the stirring speed is 45 r / min, and then a steel mold is used for casting, and the casting time is controlled within 5 min to obtain a copper-manganese alloy ingot;
[0082] The riser and bottom plate of the copper-manganese alloy ingot are sawn, and then the outer circle is turned to light treatment, and then forged at 870° C. for 60 minutes to obtain a copper-manganese rod material, and the forging size of the copper-manganese rod material is Φ90 mm;
[0083] The copper-manganese rod material is hot-rolled at 850° C. for 60 minutes to obtain a copper-manganese rod material, the size of the copper-manganese rod material is Φ13 mm;
[0084] The copper-manganese rod material is drawn, peeled and re-drawn by a combined drawing machine, and the rolling deformation is controlled to be less than 30%, so as to obtain a Φ3mm rod blank;
[0085] Then the rod blank is placed in a heating furnace, kept at 900°C for 60 minutes, subjected to process annealing treatment, and then cooled in the furnace to obtain a semi-finished flat strip;
[0086] After the semi-finished flat strip is subjected to triple rolling processing, it is loaded into a heating furnace and kept at 900°C for 60 minutes for re-annealing treatment. After cooling in the furnace, it is fine-drawn using a flat die mold of the target flat strip specification, and then kept at 850°C for 60 minutes for finished product heat treatment. After cooling, a 2×3mm finished copper-manganese flat strip is obtained.
[0087] Example 4
[0088] A method for preparing a copper-manganese flat strip for a diverter comprises the following steps:
[0089] Copper plate, electrolytic manganese, electrolytic nickel and tin ingot are used as raw materials, and the ingredients are prepared according to the ratio of Mn content of 12.4%, Ni content of 2.2%, Sn content of 0.7%, Fe content ≤0.1% and Cu as the balance. Electrolytic manganese, copper plate, electrolytic nickel and tin ingot are sequentially added into a medium frequency furnace for smelting and processing, and covering agent charcoal is added for covering and protection. The furnace is heated at a power of 50kw for 0.5h, and then the power is increased to 100kw and heated for 0.5h. The power is increased to 150kw and heated for 2h, the temperature is detected at 1280°C, and after the copper plate is melted, it is refined for 14min to obtain a raw material melt, and a copper-magnesium intermediate alloy is added to the raw material melt, the copper-magnesium intermediate alloy is added in an amount of 0.04% of the raw material melt mass, and stirred for 0.9h at a temperature of 1160°C and a stirring speed of 42r / min, and then cast with a steel mold, and the casting time is controlled within 9min to obtain a copper-manganese alloy ingot;
[0090] The riser and bottom plate of the copper-manganese alloy ingot are sawn, and then the outer circle is turned to light treatment, and then forged at 840° C. for 70 minutes to obtain a copper-manganese bar material, and the forging size of the copper-manganese bar material is Φ88 mm;
[0091] The copper-manganese rod material is hot-rolled at 810° C. for 80 minutes to obtain a copper-manganese rod material, the size of the copper-manganese rod material is Φ12 mm;
[0092] The copper-manganese rod material is drawn, peeled and re-drawn by using a combined drawing machine, and the rolling deformation is controlled to be less than 30%, so as to obtain a Φ4.5 mm rod blank;
[0093] Then the rod blank is placed in a heating furnace, kept at 860° C. for 85 minutes, subjected to process annealing treatment, and then cooled in the furnace to obtain a semi-finished flat strip;
[0094] After the semi-finished flat strip is subjected to triple rolling, it is loaded into a heating furnace, kept at 820°C for 68 minutes, and then subjected to re-annealing treatment. After cooling in the furnace, it is subjected to finish drawing treatment using a flat die of the target flat strip specification, and then kept at 780°C for 80 minutes for finished product heat treatment. After cooling, a finished copper-manganese flat strip of 2×4.5 mm is obtained.
[0095] Experimental example
[0096] The material composition and performance of the finished copper-manganese flat strip prepared in the embodiment of the present application were tested, wherein the material composition test of the copper-manganese flat strip was carried out in accordance with the standard "YS / T482-2022 Copper Alloy Direct Reading Spectrometer Test"; the Vickers hardness test was carried out in accordance with the standard "GB / T 4340.1-2024 Metal Material Vickers Hardness Test Part 1"; the resistivity test was carried out in accordance with the standard "GB / T351-2019 Metal Material Resistivity Test Method". The test results are shown in Tables 1-2 below.
[0097] Table 1
[0098]
[0099] Table 2
[0100]
[0101]
[0102] It can be seen from Tables 1-2 that the composition of the copper-manganese flat strip obtained in the present application is very close to the proportion of metal components in the ingredients, indicating that the method of the present application can be used to obtain a copper-manganese flat strip with an expected composition content, with less composition segregation, no defects of manganese element burnout, and excellent resistivity performance.
[0103] The above description is only an optional embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the inventive concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.
Claims
1. A method for preparing a copper-manganese flat strip for a diverter, characterized in that: The following steps are involved: The ingredients are prepared according to the composition requirements of the copper-manganese flat strip, and medium-frequency smelting is performed at a smelting temperature of 1200-1300°C. After smelting, a copper-magnesium intermediate alloy is added for deoxidation, and then casting is performed to obtain a copper-manganese alloy ingot; The copper-manganese alloy ingot is subjected to machining treatment and then forged at 800-870° C. to obtain a copper-manganese rod; The copper-manganese rod material is hot-rolled at 800-850° C. to obtain a copper-manganese rod material; The copper-manganese rod material is subjected to a combined drawing process and then to a process annealing process to obtain a semi-finished flat strip; The semi-finished flat strip is subjected to triple rolling and re-annealing treatment, and then fine-drawn according to a flat die mold, and then subjected to a finished product heat treatment at 750-850° C. to obtain a finished copper-manganese flat strip.
2. The method for preparing the copper-manganese flat strip for diverter according to claim 1, characterized in that: In the step of preparing the materials according to the composition requirements of the copper-manganese flat strip, copper plates, electrolytic manganese, electrolytic nickel and tin ingots are used for preparation according to the ratio of Mn content of 11-13%, Ni content of 2-3%, Sn content of 0.6-1%, Fe content ≤0.1% and Cu as the balance.
3. The method for preparing the copper-manganese flat strip for diverter according to claim 2, characterized in that: The steps of performing medium frequency smelting processing include: The electrolytic manganese, the copper plate, the electrolytic nickel and the tin ingot are sequentially added into a medium frequency furnace for smelting processing, and a covering agent is added for covering protection. The temperature is raised to 1200-1300° C. in stages, and the copper plate is refined for 10-15 minutes after being melted to obtain a raw material melt.
4. The method for preparing the copper-manganese flat strip for diverter according to claim 3, characterized in that: The step of adding copper-magnesium master alloy for deoxidation and then casting comprises: Add copper-magnesium master alloy to the raw material melt, the copper-magnesium master alloy added in an amount of 0.03-0.05% of the raw material melt mass, stir for 0.8-1.2h at a temperature of 1100-1200°C, a stirring speed of 40-45r / min, and then use a steel mold for casting, and the casting time is controlled within 5-10min.
5. The method for preparing the copper-manganese flat strip for diverter according to claim 1, characterized in that: The step of machining the copper-manganese alloy ingot comprises: The riser and bottom plate of the copper-manganese alloy ingot are sawn, and then the outer circle is turned to light treatment.
6. The method for preparing the copper-manganese flat strip for diverter according to claim 1, characterized in that: In the step of forging at 800-870° C. to obtain the copper-manganese rod, the forging time is 60-90 min, and the forging size of the copper-manganese rod is Φ85-Φ90 mm.
7. The method for preparing the copper-manganese flat strip for diverter according to claim 1, characterized in that: In the step of hot rolling the copper-manganese rod material at 800-850° C. to obtain the copper-manganese rod material, the holding time of the hot rolling treatment is 60-90 minutes, and the size of the copper-manganese rod material is Φ12-Φ13 mm.
8. The method for preparing the copper-manganese flat strip for diverter according to claim 1, characterized in that: The step of subjecting the copper-manganese rod material to a combined drawing process and then to a process annealing process to obtain a semi-finished flat strip comprises: The copper-manganese rod material is drawn, peeled and re-drawn by using a combined drawing machine, and the deformation is controlled to be less than 30% to obtain a rod blank; The rod blank is then placed in a heating furnace and kept at 800-900° C. for 60-90 minutes for annealing. After cooling in the furnace, a semi-finished flat strip is obtained.
9. The method for preparing the copper-manganese flat strip for diverter according to claim 1, characterized in that: The step of subjecting the semi-finished flat strip to triple rolling and re-annealing, and then fine drawing according to a flat die, and then heat treating the finished product at 750-850° C. to obtain the finished copper-manganese flat strip comprises: After the semi-finished flat strip is subjected to triple rolling, it is loaded into a heating furnace, kept at 800-900°C for 60-90 minutes, and then subjected to re-annealing treatment. After cooling in the furnace, it is subjected to fine drawing treatment using a flat die of the target flat strip specification, and then subjected to finished product heat treatment at 750-850°C for 60-90 minutes. After cooling, a finished copper-manganese flat strip is obtained.
10. A copper-manganese flat belt for a diverter, characterized in that: The method for preparing the copper-manganese flat strip for the diverter is used as described in any one of claims 1 to 9.