Rolling process of high-vanadium low-silicon manganese alloy steel

Abstract

The invention relates to the technical field of metallurgical processes, and discloses a rolling process of high-vanadium low-silicon manganese alloy steel, raw materials of the steel are designed, the raw materials comprise basic metal and alloy elements, smelting is performed according to the designed raw materials to obtain a primary bar shape, an alloy steel bar is moved into an induction heating furnace to be preheated, and the alloy steel bar is cooled to the room temperature to obtain the high-vanadium low-silicon manganese alloy steel. The preheated alloy steel bar is moved into a line rolling machine, deformation system parameters are designed, the rolling temperature, speed and roll gap parameters are adjusted, confirmation and checking are conducted again according to the deformation system, the rolling temperature, the speed and the roll gap parameters designed in the previous step, after all the parameters are correctly set, equipment is started, and the rolling time is shortened; and meanwhile, real-time monitoring equipment is arranged to adjust parameters in the rolling process so as to maintain proper rolling conditions, when the rolling temperature is too high or too low, monitoring information is transmitted to the cooling water automatic control system through a network, the flow of cooling water is automatically adjusted, and the phenomenon of overheating in the steel forming process can be avoided in the adjusting process.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical processes, and in particular to a rolling process for high-vanadium and low-silicon manganese alloy steel. Background Art

[0002] The rolling process of high-vanadium, low-silicon-manganese alloy steel achieves the goal of reducing alloy costs and improving steel forming performance and organizational structure by optimizing the chemical composition of steel and adjusting rolling process parameters. In specific operations, it involves technical means such as jet cooling water penetrators, high-rigidity short stress line bar rolling mills, and rapid water cooling processes after finishing rolling, as well as the application of controlled nitrogen blowing technology and centralized adjustment control technology for all water tanks. These measures work together to improve the mechanical properties and production efficiency of steel, while ensuring the stability of product quality. However, the existing process has certain difficulties in controlling the temperature and cooling rate of steel, which will affect the mechanical properties and organizational structure of steel. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a rolling process for high-vanadium, low-silicon manganese alloy steel, which has the advantages of precise temperature control and efficient cooling, and solves the problem that the prior art has certain difficulties in controlling the temperature and cooling rate of steel.

[0004] To achieve the above object, the present invention provides the following technical solution: a rolling process of a high-vanadium low-silicon manganese alloy steel, comprising the following steps: Step 1: Raw material design stage: Design the raw materials of steel, including base metals and alloy elements; Step 2: Smelting and casting: Smelt the raw materials according to the design to obtain the initial bar shape; Step 3: Preheating treatment: Move the alloy steel bar into the induction heating furnace for preheating; Step 4: Adjust rolling process parameters: After preheating, move the alloy steel bar into the rolling mill, design deformation system parameters, and adjust rolling temperature, speed and roll gap parameters; Step 5, rolling operation: according to the deformation system, rolling temperature, speed and roll gap parameters designed in step 4, confirm and check again. After all parameters have been set correctly, start the equipment and set real-time monitoring equipment to adjust the rolling process parameters. After rolling is completed, the steel is formed.

[0005] Preferably, in step 1, the base metals include iron, steel, silicon and manganese, and the alloying elements include carbon, boron, sulfur, phosphorus, vanadium, tungsten and europium.

[0006] Preferably, the raw materials of the steel in step 1 and their mass parts are: 10-15 mass parts of iron; 26-29 mass parts of steel; 0.20-0.36 mass parts of silicon; 13-16 mass parts of manganese; 0.23-0.25 mass parts of carbon; 0.40-0.45 mass parts of boron; 0.011-0.013 mass parts of sulfur, 0.009-0.014 mass parts of phosphorus; 0.021-0.033 mass parts of vanadium; 0.23-0.31 mass parts of tungsten; 0.016-0.019 mass parts of europium.

[0007] Preferably, the specific process of smelting and casting in step 2 is as follows: S1.1, put the raw materials into an induction furnace and melt them at a temperature of 1700-1750℃ for 1 hour to form refined molten metal; S1.2. Pour the refined molten metal into the metal mold and control the cooling rate at 15-20℃ / min.

[0008] Preferably, the preheating conditions of the alloy steel bar in step three are: the temperature is set to 1000-1050° C., and the time is set to 2-3 hours.

[0009] Preferably, in the step 4, deformation system parameters are designed, and the parameters include total reduction rate, pass reduction amount and deformation speed. The total reduction rate is controlled at 30-50%, the pass reduction amount is controlled at 5-10% of the total reduction rate, and the deformation speed is controlled at 6-9 m / s.

[0010] Preferably, in the step 4, the rolling temperature is adjusted, and the starting rolling temperature of the preheated alloy steel bar is controlled. The starting rolling temperature is set to 1000-1015°C, the shearing temperature is set to 1010-1035°C, and the upper cooling bed temperature is set to 890-900°C. At the same time, an automatic cooling water control system is added, and the rolling temperature difference is monitored by the monitoring equipment of the automatic cooling water control system. After setting the temperature, the system can automatically adjust the cooling water flow rate and automatically move the nozzle position according to the temperature range, and keep the provided temperature difference within ±5°C to achieve precise temperature control, and control the tempering temperature at 560-600°C, the finishing rolling temperature at 980-1000°C, and the cooling bed tempering temperature at 870-900°C.

[0011] Preferably, in step 4, the rolling speed is adjusted between 20-30 m / s.

[0012] Preferably, the process of adjusting the roller gap rolling in step 4 is: by electrically adjusting the distance between the upper and lower rollers, and connecting the cooling water automatic control system, when the monitoring equipment of the cooling water automatic control system detects that the rolling temperature difference is greater than 5°C, the distance between the upper and lower rollers is automatically increased by 0.022%.

[0013] Preferably, in step five, a real-time monitoring device is simultaneously provided to adjust the rolling process parameters, including rolling force, rolling temperature and rolling speed, and the rolling parameters are fine-tuned according to the monitored data.

[0014] Compared with the prior art, the present invention provides a rolling process for high-vanadium low-silicon manganese alloy steel, which has the following beneficial effects: 1. The present invention helps to improve the thermal conductivity of steel by adding vanadium and rare earth elements (europium) into the raw material design, so that the heat generated during the rolling process can be conducted away more quickly, thereby achieving efficient cooling.

[0015] 2. The present invention can achieve the purpose of real-time monitoring of temperature changes during the rolling process through the cooling water automatic control system during the steel rolling process. When the temperature exceeds the set range, the system will automatically adjust the cooling water flow and nozzle position to ensure that the temperature quickly returns to the set value. This real-time monitoring and adjustment mechanism helps to improve the accuracy of temperature control.

[0016] 3. The present invention can accurately control the temperature during the rolling process by real-time monitoring and dynamic adjustment of the roll gap. This temperature control helps to improve the microstructure of the steel and improve its performance. When it is monitored that the rolling temperature difference is greater than 5°C, the roll gap is increased to increase the permeability of the cooling water, thereby accelerating the dissipation of heat. The cooling process can more quickly take away the heat generated during the rolling process and achieve efficient cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a process flow chart of the present invention; DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1 A rolling process for high-vanadium and low-silicon-manganese alloy steel comprises the following steps: Step 1: Raw material design stage: Design the raw materials of steel, including base metals and alloy elements, to obtain the required mechanical properties, corrosion resistance or other characteristics of steel; Step 2: Smelting and casting: Smelt the raw materials according to the design to obtain the initial bar shape; Step 3: Preheating: Move the alloy steel bars into the induction heating furnace for preheating to improve the rolling effect and reduce the rolling intensity. The temperature and time set during the preheating process can avoid the negative impact of overheating or overcooling on the raw materials; Step 4: Adjust rolling process parameters: After preheating, move the alloy steel bar into the rolling mill, design deformation system parameters, and adjust rolling temperature, speed and roll gap parameters; Step 5, rolling operation: according to the deformation system, rolling temperature, speed and roll gap parameters designed in step 4, confirm and check again. After all parameters have been set correctly, start the equipment and set real-time monitoring equipment to adjust the rolling process parameters. After rolling is completed, the steel is formed.

[0020] Rolling temperature: High rolling temperature can refine the grains, thereby improving the ductility and plasticity of the steel. However, too high a heating temperature or too long a heating time will cause the grains to grow and reduce the mechanical properties. Rolling speed: High rolling speed helps to shorten the cooling time, but care should be taken to avoid defects caused by insufficient cooling; Roll gap adjustment: Roll gap adjustment can ensure that the rolled piece has the correct size, normal shape and uniform distribution of the reduction; Deformation system: The distribution of deformation can directly affect the rolling mill output and product quality. The design of the deformation system should reasonably distribute the rolling load of the entire rolling process to achieve efficient and energy-saving production.

[0021] Specifically, in step 1, the base metals include iron, steel, silicon and manganese, and the alloying elements include carbon, boron, sulfur, phosphorus, vanadium, tungsten and europium.

[0022] Specifically, the smelting and casting in step 2 has the following specific process: S1.1, put the raw materials into an induction furnace and melt them at a temperature of 1700-1750℃ for 1 hour to form refined molten metal, in order to remove impurities and improve the purity of the metal; S1.2. Pour the refined molten metal into the metal mold and control the cooling rate at 15-20℃ / min to ensure that the liquid metal can fill all parts of the mold.

[0023] Specifically, the preheating conditions of the alloy steel bar in step three are: the temperature is set to 1000-1050°C, and the time is set to 2-3h.

[0024] The advantages are: preheating the alloy steel bars before rolling can improve the plasticity of the material and make it easier to shape. Setting the temperature range of 1000-1050°C can effectively reduce the deformation resistance of the material and reduce the internal stress that will appear during the rolling process. A preheating time of 2-3 hours can make the entire bar reach a uniform temperature distribution, avoiding uneven deformation or internal defects caused by large temperature gradients. The above preheating conditions are conducive to improving rolling efficiency.

[0025] Specifically, in step 4, deformation system parameters are designed, including total reduction rate (total reduction rate refers to the ratio of material thickness reduction during the entire rolling process), pass reduction amount (pass reduction amount refers to the specific value of material thickness reduction during each rolling) and deformation speed (deformation speed refers to the speed at which the material deforms during the rolling process). The total reduction rate is controlled at 30-50%, the pass reduction amount is controlled at 5-10% of the total reduction rate, and the deformation speed is controlled at 6-9m / s.

[0026] Specifically, in step 4, the rolling speed is adjusted between 20-30 m / s.

[0027] Specifically, in step five, a real-time monitoring device is provided to adjust the rolling process parameters. The real-time monitoring device is used to monitor various parameters in the rolling process in real time, including rolling force, rolling temperature and rolling speed. The rolling parameters are fine-tuned according to the monitored data to maintain appropriate rolling conditions. When the rolling temperature is too high or too low, the monitoring information is transmitted to the cooling water automatic control system through the network to automatically adjust the cooling water flow rate. When the size or shape of the rolled piece does not meet the requirements, the roll gap size is adjusted in time to avoid overheating and overburning, which affects the mechanical properties of the final product.

[0028] Example 1 The raw materials of the designed steel and their mass parts are: 13 mass parts of iron; 28 mass parts of steel; 0.26 mass parts of silicon; 15 mass parts of manganese; 0.24 mass parts of carbon; 0.44 mass parts of boron; 0.012 mass parts of sulfur, 0.011 mass parts of phosphorus; 0.03 mass parts of vanadium; 0.28 mass parts of tungsten; and 0.019 mass parts of europium.

[0029] Comparative Example 1 The raw materials of the designed steel and their mass parts are: 13 mass parts of iron; 28 mass parts of steel; 0.26 mass parts of silicon; 15 mass parts of manganese; 0.24 mass parts of carbon; 0.44 mass parts of boron; 0.012 mass parts of sulfur, 0.011 mass parts of phosphorus; 0.03 mass parts of cobalt; 0.28 mass parts of tungsten; and 0.019 mass parts of aluminum.

[0030] The addition of vanadium and rare earth elements (europium) in Example 1 helps to improve the thermal conductivity of steel, so that the heat generated during the rolling process can be conducted away more quickly, thereby achieving efficient cooling. However, in Comparative Example 1, since no rare earth elements are added and the thermal conductivity of cobalt is lower than that of vanadium, its cooling efficiency is lower than that of Example 1.

[0031] Example 2 Adjust the rolling temperature and control the starting rolling temperature of the preheated alloy steel bars. Set the starting rolling temperature to 1010℃, the shearing temperature to 1025℃, and the upper cooling bed temperature to 895℃. At the same time, add a cooling water automatic control system, and monitor the rolling temperature difference through the monitoring equipment of the cooling water automatic control system. After setting the temperature, the system can automatically adjust the cooling water flow and automatically move the nozzle position according to the temperature range to keep the provided temperature difference within ±5℃ to achieve precise temperature control, control the tempering temperature at 580℃, the finishing rolling temperature at 990℃, and the cooling bed tempering temperature at 880℃.

[0032] Comparative Example 2 Adjust the rolling temperature and control the starting rolling temperature of the preheated alloy steel bar. Set the starting rolling temperature to 1010℃, the shearing temperature to 1025℃, the upper cooling bed temperature to 895℃, the tempering temperature to 580℃, the finishing rolling temperature to 990℃, and the cooling bed tempering temperature to 880℃.

[0033] In Example 2, the cooling water automatic control system can monitor the temperature changes in the rolling process in real time. When the temperature exceeds the set range, the system will automatically adjust the cooling water flow and nozzle position to ensure that the temperature quickly returns to the set value. This real-time monitoring and adjustment mechanism helps to improve the accuracy of temperature control. However, in Comparative Example 2, due to the lack of real-time monitoring and adjustment mechanism, temperature control relies on manual experience or preset parameters. This method will cause large temperature fluctuations and cannot achieve precise temperature control.

[0034] At the same time, the cooling water automatic control system in Example 2 can not only adjust the cooling water flow and nozzle position in real time, but also make intelligent adjustments according to the actual needs of the rolling process. This optimized cooling process can more quickly take away the heat generated during the rolling process and achieve efficient cooling. The cooling process in Comparative Example 2 is relatively fixed and lacks flexibility, which will lead to low cooling efficiency when the temperature fluctuates or the plate is heated unevenly, and even over-cooling or insufficient cooling may occur.

[0035] Example 3 The process of adjusting the roll gap is as follows: the distance between the upper and lower rolls is electrically adjusted and connected to the cooling water automatic control system. When the monitoring equipment of the cooling water automatic control system detects that the rolling temperature difference is greater than 5°C, the distance between the upper and lower rolls is automatically increased by 0.022%. The original intention of designing this step is to ensure temperature control and product quality during the rolling process.

[0036] Comparative Example 3 The process of adjusting the roll gap is as follows: electrically adjusting the distance between the upper and lower rolls and connecting the cooling water automatic control system.

[0037] In Example 3, the temperature during the rolling process can be accurately controlled by real-time monitoring and dynamic adjustment of the roll gap. This temperature control helps to improve the microstructure of the steel and improve its performance. However, in Comparative Example 3, due to the lack of a dynamic adjustment mechanism for the roll gap, the accuracy of temperature control will be affected to a certain extent. At the same time, in Example 3, when it is monitored that the rolling temperature difference is greater than 5°C, the permeability of the cooling water is increased by adjusting the roll gap, thereby accelerating the dissipation of heat. The cooling process can more quickly take away the heat generated during the rolling process and achieve efficient cooling. The cooling process of Comparative Example 3 relies on the cooling water automatic control system and lacks the assistance of dynamic adjustment of the roll gap. When the performance of the steel is unstable, the cooling efficiency will be low.

[0038] Table 1

[0039] The finished steel products rolled from the raw materials of Examples 1-3 and Comparative Examples 1-3 were subjected to performance tests. The following Table 2 is a scoring system based on a full score of 10 to evaluate the performance of the finished steel products of the Examples and Comparative Examples: Table 2

[0040] Note: In this example, each performance metric is scored on a scale of 1 to 10, with 10 representing the highest performance.

[0041] From the above analysis, it can be seen that Examples 1 to 3 improve the overall performance of the steel by adding specific elements, precise temperature control and dynamic adjustment of the roll gap. The above improvement measures not only improve the thermal conductivity and cooling efficiency of the steel, but also optimize the microstructure and performance stability.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rolling process for high vanadium and low silicon manganese alloy steel, characterized in that: The following steps are involved: Step 1: Raw material design stage: Design the raw materials of steel, including base metals and alloy elements; Step 2: Smelting and casting: Smelt the raw materials according to the design to obtain the initial bar shape; Step 3: Preheating treatment: Move the alloy steel bar into the induction heating furnace for preheating; Step 4: Adjust rolling process parameters: After preheating, move the alloy steel bar into the rolling mill, design deformation system parameters, and adjust rolling temperature, speed and roll gap parameters; Step 5, rolling operation: according to the deformation system, rolling temperature, speed and roll gap parameters designed in step 4, confirm and check again. After all parameters have been set correctly, start the equipment and set real-time monitoring equipment to adjust the rolling process parameters. After rolling is completed, the steel is formed.

2. The rolling process of a high-vanadium, low-silicon-manganese alloy steel according to claim 1, characterized in that: In the step 1, the base metals include iron, steel, silicon and manganese, and the alloying elements include carbon, boron, sulfur, phosphorus, vanadium, tungsten and europium.

3. The rolling process of a high-vanadium, low-silicon-manganese alloy steel according to claim 2, characterized in that: The raw materials of the steel in step 1 and their weight parts are: 10-15 weight parts of iron; 26-29 weight parts of steel; 0.20-0.36 weight parts of silicon; 13-16 weight parts of manganese; 0.23-0.25 weight parts of carbon; 0.40-0.45 parts by mass of boron; 0.011-0.013 parts by mass of sulfur, 0.009-0.014 parts by mass of phosphorus; 0.021-0.033 parts by mass of vanadium; 0.23-0.31 parts by mass of tungsten; 0.016-0.019 parts by mass of europium.

4. The rolling process of a high vanadium low silicon manganese alloy steel according to claim 1, characterized in that: The specific process of smelting and casting in step 2 is as follows: S1.1, put the raw materials into an induction furnace and melt them at a temperature of 1700-1750℃ for 1 hour to form refined molten metal; S1.

2. Pour the refined molten metal into the metal mold and control the cooling rate at 15-20℃ / min.

5. The rolling process of a high vanadium low silicon manganese alloy steel according to claim 1, characterized in that: The preheating conditions of the alloy steel bar in step 3 are: the temperature is set to 1000-1050° C., and the time is set to 2-3 hours.

6. The rolling process of a high-vanadium low-silicon manganese alloy steel according to claim 1, characterized in that: In the step 4, deformation system parameters are designed, including total reduction rate, pass reduction amount and deformation speed. The total reduction rate is controlled at 30-50%, the pass reduction amount is controlled at 5-10% of the total reduction rate, and the deformation speed is controlled at 6-9 m / s.

7. The rolling process of a high-vanadium low-silicon manganese alloy steel according to claim 1, characterized in that: In the step 4, the rolling temperature is adjusted, and the starting rolling temperature of the preheated alloy steel bar is controlled. The starting rolling temperature is set to 1000-1015°C, the shearing temperature is set to 1010-1035°C, and the upper cooling bed temperature is set to 890-900°C. At the same time, an automatic cooling water control system is added, and the rolling temperature difference is monitored by the monitoring equipment of the automatic cooling water control system. After setting the temperature, the system can automatically adjust the cooling water flow and automatically move the nozzle position according to the temperature range to keep the provided temperature difference within ±5°C to achieve precise temperature control, control the tempering temperature at 560-600°C, control the finishing rolling temperature at 980-1000°C, and control the cooling bed tempering temperature at 870-900°C.

8. The rolling process of a high-vanadium, low-silicon-manganese alloy steel according to claim 1, characterized in that: In the step 4, the rolling speed is adjusted between 20-30 m / s.

9. The rolling process of a high-vanadium, low-silicon-manganese alloy steel according to claim 1, characterized in that: The process of adjusting the roll gap in step 4 is: electrically adjusting the distance between the upper and lower rolls, and connecting the cooling water automatic control system. When the monitoring equipment of the cooling water automatic control system detects that the rolling temperature difference is greater than 5°C, the distance between the upper and lower rolls is automatically increased by 0.022%.

10. The rolling process of a high-vanadium, low-silicon-manganese alloy steel according to claim 1, characterized in that: In the step five, a real-time monitoring device is simultaneously provided to adjust the rolling process parameters, including rolling force, rolling temperature and rolling speed, and the rolling parameters are fine-tuned according to the monitored data.

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