A production method for preventing the peeling of the oxide scale of an ultra-low carbon steel wire rod

Abstract

This invention relates to the field of metal wire technology, specifically a production method for preventing the detachment of iron oxide scale from ultra-low carbon steel wire rod. The ultra-low carbon steel wire rod is composed of the following chemical composition by weight percentage: C≤0.01%, Si≤0.01%, Mn≤0.08%, P≤0.015%, S≤0.010%, Al≤0.02%, N≤0.0040%, with the remainder being Fe and unavoidable impurities. This invention primarily utilizes a heating, rolling, and controlled cooling process to achieve an iron oxide scale adhesion rate of over 98% on the produced wire rod, with an iron oxide scale thickness of 10-20µm. This prevents the base material of the wire rod from contacting air after the scale detaches, reducing processing costs for users and improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of metal wire technology, specifically to a production method for preventing the detachment of iron oxide scale from ultra-low carbon steel wire rod. Background Technology

[0002] A typical application of ultra-low carbon steel is copper-clad steel wire rod, which is mainly used to manufacture copper-clad steel wire. This wire rod is processed into copper-clad steel wire through a series of processes. The general production process of ultra-low carbon copper-clad steel is as follows: Φ6.5mm wire rod - drawing Φ1.3~1.6mm - annealing - drawing - copper plating - drawing to a finished product thickness of 0.2~0.5mm or even below 0.1mm. The drawing compression ratio is extremely high. To ensure the drawing performance and service performance of the wire rod, extremely strict requirements are placed on the iron oxide scale of the wire rod, which is very difficult to control.

[0003] Copper-clad steel is an ultra-low carbon product. If production control is inadequate, the wire rod can suffer from severe iron oxide scale shedding. After the scale detaches, the base material of the wire rod is exposed to air, and after prolonged storage, "black spots" easily grow on the base material. These spots are difficult to remove during subsequent mechanical descaling by the user, affecting subsequent drawing. Furthermore, the iron oxide scale on the wire rod surface is thin and easily detached, resulting in a low descaling rate and difficulty in removing the scale. Even after mechanical descaling, residual scale remains, causing defects such as scale indentation during wire drawing, increasing wire breakage rate, increasing die wear, increasing user processing costs, and reducing work efficiency.

[0004] The reason for the peeling of iron oxide scale in ultra-low carbon steel is as follows: Due to the different shrinkage rates of the iron oxide scale and the substrate during high-temperature cooling, internal stress is generated in the scale, and interfacial stress is generated between the scale and the substrate. When the internal stress exceeds the strength of the scale, it causes the scale to crack. When the interfacial stress exceeds the adhesion stress of the scale, it causes cracks at the junction of the oxide layer and the substrate, forming cavities. Cracking and cavities cause the scale to peel off. The control principle for iron oxide scale in ultra-low carbon steel wire rod is as follows: FeO in the scale is unstable below 570℃ and will undergo the following reaction: 4FeO→Fe3O4+Fe, causing FeO to decompose and generate cavities at the boundary between the substrate and the scale. The decomposition of iron oxide scale occurs at the end of the oxidation stage. It only changes the microstructure of the scale and has no effect on its thickness. The maximum rate of FeO decomposition is 400℃, and the cooling rate above 400℃ must be greater than 40℃ / min. If the cooling rate of the wire rod above 400℃ cannot exceed 40℃ / min, it will accelerate the decomposition of FeO, generating larger separation cavities at the FeO-matrix interface. Simultaneously, the rolling process must be designed to lay the foundation for subsequent controlled cooling. Based on the analysis of the iron oxide scale mechanism, the design approach is to ensure a certain scale thickness, shorten the residence time of the wire rod below 570℃, and generate dense Fe3O4 that adheres to the wire rod surface. The core element is the design of the controlled cooling process. Additionally, a small amount of Al is included in the composition design. This serves two purposes: firstly, it alters the scale structure, reducing FeO content and relatively increasing Fe3O4 and Fe2O3 content; secondly, it refines the grain size, improving the density and stability of the iron oxide scale; and thirdly, the formation of an Al2O3 layer on the matrix surface enhances the adhesion between the iron oxide scale and the matrix, preventing detachment.

[0005] Chinese patents CN112122338B ("Ultra-low carbon steel wire rod for copper-clad steel wire and its production process"), CN107413860A ("A method for controlling iron oxide scale on ultra-low carbon steel"), and CN104588418B ("A method for eliminating pitting defects on the surface of ultra-low carbon steel") have not solved the above-mentioned technical problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a production method for preventing the iron oxide scale from falling off ultra-low carbon steel wire rod, which can effectively avoid the iron oxide scale from falling off the wire rod, and the iron oxide scale adhesion rate of the produced copper-clad steel wire rod is over 98%, with an iron oxide scale thickness of 10~20µm.

[0007] To achieve the above objectives, the present invention employs the following technical solution: An ultra-low carbon steel wire rod is composed of the following chemical composition by weight percentage: C≤0.01%, Si≤0.01%, Mn≤0.08%, P≤0.015%, S≤0.010%, Al≤0.02%, N≤0.0040%, with the remainder being Fe and unavoidable impurities.

[0008] A production method for preventing the shedding of iron oxide scale from ultra-low carbon steel wire rod, the production method specifically includes the following steps: 1. Heating of steel billets: The billet heating temperature is 1050~1150℃.

[0009] 2. Rolling: The pre-rolling temperature is 980~1030℃, the finishing temperature is 880~930℃, the double-module temperature is 880~930℃, and the wire drawing temperature is 880~920℃.

[0010] 3. Cooling control: The roller conveyor inlet speed is 0.30–0.50 m / s, and the cooling rate is 0.5–1.5 °C / s.

[0011] The temperature of the insulation cover coil is 700-750℃, and the cooling rate is 1-2.5℃ / s.

[0012] Close the insulation cover 20-50m away from the silk-spinning area, and open all insulation covers in other locations. Turn off all fans.

[0013] For wire rods with a diameter of Ф5.5~6.5mm, close the corresponding insulation cover 20~50m away from the spinneret, and open all insulation covers at other locations. Turn off all fans. The roller conveyor inlet speed is 0.30~0.40m / s, and the cooling rate is 0.5~1.5℃ / s. The wire rod temperature at the outlet of the insulation cover is 700~750℃, and the cooling rate is 1~2.5℃ / s.

[0014] For wire rods with a diameter of 8.0 to 10.0 mm, close the corresponding insulation cover 20 to 50 m away from the spinneret, and open all insulation covers at other locations. Turn off all fans. The roller conveyor inlet speed is 0.40 to 0.50 m / s, and the cooling rate is 0.5 to 1.5℃ / s. The wire rod temperature at the outlet of the insulation cover is 700 to 750℃, and the cooling rate is 1 to 2.5℃ / s.

[0015] The copper-clad steel wire rods produced using the above production method have a wire rod size of Φ5.5mm~10.0mm, uniform microstructure and properties, an iron oxide scale adhesion rate of over 98%, and an iron oxide scale thickness of 10~20μm.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention avoids the eutectoid decomposition of FeO by precisely controlling the heating, rolling and cooling processes, thereby reducing the brittleness and tendency to peel off of the iron oxide scale; appropriately accelerating the cooling rate (0.5~2.5℃ / s) and controlling the temperature of the insulation cover (700~750℃) allows the iron oxide scale to be mainly composed of stable FeO, forming a dense and strongly adhesive oxide layer; and using lower rolling and wire drawing temperatures to control the thickness and structure of the iron oxide scale, avoiding excessively thick scale that would peel off, while also avoiding excessively thin scale that would be difficult to remove mechanically.

[0017] 2. The present invention matches the heating temperature and rolling temperature to ensure austenite homogenization and avoid abnormal grain growth. The fan is turned off and the insulation cover is controlled in sections to avoid excessive cooling and excessive internal stress in the iron oxide scale, and to prevent cracks caused by excessive temperature difference between the core and surface of the wire rod.

[0018] 3. This invention addresses the different roller speeds and cooling rates for Ф5.5~6.5mm and Ф8.0~10.0mm specifications, ensuring the uniformity of iron oxide scale on wire rods of different diameters and avoiding uneven cooling due to size differences.

[0019] 4. The iron oxide scale of the present invention adheres firmly, which can eliminate the need for pickling or mechanical descaling steps, reduce production costs and meet the downstream processing requirements such as direct drawing.

[0020] The iron oxide scale adhesion rate of the steel wire rod produced by this invention is over 98%, and the iron oxide scale thickness is 10~20µm. Through optimized composition design, the iron oxide scale is controlled on the basis of mixed crystals and adhered to the surface of the wire rod, avoiding the iron oxide scale from falling off. This prevents the base of the wire rod from contacting the air after the iron oxide scale falls off, reducing the user's processing cost and improving work efficiency. Detailed Implementation

[0021] This invention discloses a production method for preventing the detachment of iron oxide scale from ultra-low carbon steel wire rod. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve the desired result. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention.

[0022] The methods and applications of the present invention have been described through preferred embodiments. Those skilled in the art will be able to make modifications or appropriate alterations and combinations to the methods and applications described herein without departing from the content, spirit and scope of the present invention, so as to realize and apply the technology of the present invention.

[0023] An ultra-low carbon steel wire rod is composed of the following chemical composition by weight percentage: C≤0.01%, Si≤0.01%, Mn≤0.08%, P≤0.015%, S≤0.010%, Al≤0.02%, N≤0.0040%, with the remainder being Fe and unavoidable impurities.

[0024] A production method for preventing the shedding of iron oxide scale from ultra-low carbon steel wire rod, the production method specifically includes the following steps: 1. Heating of steel billets: The billet heating temperature is 1050~1150℃.

[0025] 2. Rolling: The pre-rolling temperature is 980~1030℃, the finishing temperature is 880~930℃, the double-module temperature is 880~930℃, and the wire drawing temperature is 880~920℃.

[0026] Based on the consideration of microstructure and performance control, a lower rolling and wire drawing temperature is used to control the thickness and structure of the iron oxide scale, so as to avoid the iron scale being too thick and falling off, and also to avoid the iron scale being too thin and difficult to remove by mechanical peeling.

[0027] 3. Cooling control: This invention breaks with traditional processes (which use low roller speeds, shut-off fans, and closed insulation covers for slow cooling). Instead, it employs an appropriate roller speed and partially opens the insulation covers online to accelerate cooling, thus preventing the eutectoid decomposition reaction of FeO and controlling the iron oxide scale on the wire rod. The process involves shutting off the fans, closing the corresponding insulation covers 20-50m from the wire spinneret, and opening all other insulation covers.

[0028] For wire rods with a diameter of Ф5.5~6.5mm, close the corresponding insulation cover 20~50m away from the spinneret, and open all insulation covers at other locations. Turn off all fans. The roller conveyor inlet speed is 0.30~0.40m / s, and the cooling rate is 0.5~1.5℃ / s. The wire rod temperature at the outlet of the insulation cover is 700~750℃, and the cooling rate is 1~2.5℃ / s.

[0029] For wire rods with a diameter of 8.0 to 10.0 mm, close the corresponding insulation cover 20 to 50 m away from the spinneret, and open all insulation covers at other locations. Turn off all fans. The roller conveyor inlet speed is 0.40 to 0.50 m / s, and the cooling rate is 0.5 to 1.5℃ / s. The wire rod temperature at the outlet of the insulation cover is 700 to 750℃, and the cooling rate is 1 to 2.5℃ / s.

[0030] The copper-clad steel wire rods produced using the above production method have a wire rod size of Φ5.5mm~10.0mm, uniform microstructure and properties, an iron oxide scale adhesion rate of over 98%, and an iron oxide scale thickness of 10~20μm.

[0031] Example 1: A type of ultra-low carbon steel wire rod, with a wire rod diameter of Ф6.5mm, and the chemical composition and its mass percentage of the wire rod are as follows: C: 0.002%, Si: 0.005%, Mn: 0.025%, P: 0.005%, S: 0.005%, Al: 0.01%, N: 0.0030%, balance Fe and unavoidable impurities.

[0032] The production method for preventing the detachment of iron oxide scale from the aforementioned ultra-low carbon steel wire rod specifically includes the following steps: 1. Steel billet heating: Steel billet heating temperature 1050℃.

[0033] 2. Rolling temperature: 980℃ for pre-finishing rolling, 880℃ for finishing rolling, 880℃ for entering the double module, and 880℃ for wire drawing. Based on the control of microstructure and properties, lower rolling and wire drawing temperatures are used to control the thickness and structure of iron oxide scale, so as to avoid the scale from falling off due to excessive thickness, and also to avoid the scale from being too thin and difficult to remove by mechanical peeling.

[0034] 3. Cooling control process: Close the corresponding insulation cover 20m away from the spinning point, open all insulation covers at other locations, turn off all fans and fan louvers, the roller conveyor inlet speed is 0.40m / s, the cooling rate is 1℃ / s; the temperature of the wire rod exiting the insulation cover is 720℃, and the cooling rate is 2℃ / s.

[0035] Wire rod microstructure and properties: The microstructure and properties are uniform, the iron oxide scale adhesion rate of copper-clad steel wire rod reaches 98%, and the iron oxide scale thickness is 10µm.

[0036] Example 2: A type of ultra-low carbon steel wire rod, with a wire rod specification of Ф5.5mm, and the chemical composition and its mass percentage of the wire rod are as follows: C: 0.0015%, Si: 0.007%, Mn: 0.035%, P: 0.008%, S: 0.007%, Al: 0.015%, N: 0.0040%, balance Fe and unavoidable impurities.

[0037] The production method for preventing the detachment of iron oxide scale from the aforementioned ultra-low carbon steel wire rod specifically includes the following steps: 1. Billet heating: The billet heating temperature is 1080℃.

[0038] 2. Rolling temperature: 990℃ for pre-finishing rolling, 890℃ for finishing rolling, 890℃ for entering the double module, and 895℃ for wire drawing. Based on the control of microstructure and properties, lower rolling and wire drawing temperatures are used to control the thickness and structure of iron oxide scale, so as to avoid the scale from falling off due to excessive thickness, and also to avoid the scale from being too thin and difficult to remove by mechanical peeling.

[0039] 3. Cooling control process: Close the corresponding insulation cover 25m away from the spinning point, open all insulation covers at other locations, turn off all fans and fan louvers, the roller conveyor inlet speed is 0.30 m / s, the cooling rate is 1.5℃ / s; the temperature of the wire rod exiting the insulation cover is 700℃, and the cooling rate is 2.5℃ / s.

[0040] Wire rod microstructure and properties: The microstructure and properties are uniform, the iron oxide scale adhesion rate of copper-clad steel wire rod reaches 100%, and the iron oxide scale thickness is 13µm.

[0041] Example 3: A type of ultra-low carbon steel wire rod, with a wire rod diameter of Ф6.5mm, and the chemical composition and its mass percentage of the wire rod are as follows: C: 0.0025%, Si: 0.006%, Mn: 0.04%, P: 0.007%, S: 0.006%, Al: 0.016%, N: 0.0030%, balance Fe and unavoidable impurities.

[0042] The production method for preventing the detachment of iron oxide scale from the aforementioned ultra-low carbon steel wire rod specifically includes the following steps: 1. Steel billet heating: Steel billet heating temperature 1100℃.

[0043] 2. Rolling temperature: 1000℃ for pre-finishing rolling, 900℃ for finishing rolling, 900℃ for entering the double module, and 900℃ for wire drawing. Based on the control of microstructure and properties, lower rolling and wire drawing temperatures are used to control the thickness and structure of iron oxide scale, so as to avoid the scale from falling off due to excessive thickness, and also to avoid the scale from being too thin and difficult to remove by mechanical peeling.

[0044] 3. Cooling control process: Close the corresponding insulation cover 30m away from the spinning point, open all insulation covers at other locations, turn off all fans and fan louvers, the roller conveyor inlet speed is 0.40m / s, the cooling rate is 1.5℃ / s; the wire rod temperature at the outlet of the insulation cover is 730℃, and the cooling rate is 2℃ / s. Wire rod microstructure and properties: The microstructure and properties are uniform, the iron oxide scale adhesion rate of copper-clad steel wire rod is over 100%, and the iron oxide scale thickness is 15µm; Example 4: A type of ultra-low carbon steel wire rod, with a wire rod specification of Ф8.0mm, and the chemical composition and its mass percentage of the wire rod are as follows: C: 0.0013%, Si: 0.006%, Mn: 0.037%, P: 0.007%, S: 0.008%, Al: 0.018%, N: 0.0030%, balance Fe and unavoidable impurities.

[0045] The production method for preventing the detachment of iron oxide scale from the aforementioned ultra-low carbon steel wire rod specifically includes the following steps: 1. Billet heating: The billet heating temperature is 1120℃.

[0046] 2. Rolling temperature: 1010℃ for pre-finishing rolling, 910℃ for finishing rolling, 910℃ for entering the double module, and 915℃ for wire drawing. Based on the control of microstructure and properties, lower rolling and wire drawing temperatures are used to control the thickness and structure of iron oxide scale, so as to avoid the scale from falling off due to excessive thickness, and also to avoid the scale from being too thin and difficult to remove by mechanical peeling.

[0047] 3. Cooling control process: Close the corresponding insulation cover 35m away from the spinning point, open all insulation covers at other locations, turn off all fans and fan louvers, the roller conveyor inlet speed is 0.40m / s, the cooling rate is 1℃ / s; the wire rod temperature at the outlet of the insulation cover is 740℃, and the cooling rate is 1.5℃ / s.

[0048] The wire rod has uniform microstructure and properties. The iron oxide scale adhesion rate of the copper-clad steel wire rod reaches 100%, and the iron oxide scale thickness is 17µm. Example 5: A type of ultra-low carbon steel wire rod, with a wire rod specification of Ф10.0mm, and the chemical composition and its mass percentage of the wire rod are as follows: C: 0.0011%, Si: 0.005%, Mn: 0.032%, P: 0.004%, S: 0.007%, Al: 0.019%, N: 0.0024%, balance Fe and unavoidable impurities.

[0049] The production method for preventing the detachment of iron oxide scale from the aforementioned ultra-low carbon steel wire rod specifically includes the following steps: 1. Billet heating: The billet heating temperature is 1150℃.

[0050] 2. Rolling temperature: 1020℃ for pre-finishing rolling, 920℃ for finishing rolling, 920℃ for entering the double module, and 920℃ for wire drawing. Based on the control of microstructure and properties, lower rolling and wire drawing temperatures are used to control the thickness and structure of iron oxide scale, so as to avoid the scale from falling off due to excessive thickness, and also to avoid the scale from being too thin and difficult to remove by mechanical peeling.

[0051] 3. Cooling control process: Close the corresponding insulation cover 35m away from the spinning point, open all insulation covers at other locations, turn off all fans and fan louvers, the roller conveyor inlet speed is 0.50m / s, and the cooling rate is 0.5℃ / s; the temperature of the wire rod exiting the insulation cover is 700~750℃, and the cooling rate is 1℃ / s.

[0052] The wire rod has uniform microstructure and properties. The iron oxide scale adhesion rate of the copper-clad steel wire rod reaches 100%, and the iron oxide scale thickness is 20µm. Example 6: A type of ultra-low carbon steel wire rod, with a wire rod diameter of Ф6.5mm, and the chemical composition and its mass percentage of the wire rod are as follows: C: 0.0009%, Si: 0.006%, Mn: 0.028%, P: 0.009%, S: 0.006%, Al: 0.02%, N: 0.0027%, with the balance being Fe and unavoidable impurities. The technical solution is as follows: The production method for preventing the detachment of iron oxide scale from the aforementioned ultra-low carbon steel wire rod specifically includes the following steps: 1. Billet heating: The billet heating temperature is 1150℃.

[0053] 2. Rolling temperature: 1030℃ for pre-finishing rolling, 930℃ for finishing rolling, 930℃ for entering the double module, and 920℃ for wire drawing. Based on the control of microstructure and properties, lower rolling and wire drawing temperatures are used to control the thickness and structure of iron oxide scale, so as to avoid the scale from falling off due to excessive thickness, and also to avoid the scale from being too thin and difficult to remove by mechanical peeling.

[0054] 3. Cooling control process: Close the corresponding insulation cover 45m away from the spinning point, open all insulation covers at other locations, turn off all fans and fan louvers, the roller conveyor inlet speed is 0.35m / s, the cooling rate is 1℃ / s; the temperature of the wire rod exiting the insulation cover is 725℃, and the cooling rate is 1.8℃ / s.

[0055] Wire rod microstructure and properties: The microstructure and properties are uniform, the iron oxide scale adhesion rate of copper-clad steel wire rod reaches 99%, and the iron oxide scale thickness is 12µm.

[0056] Example 7: A type of ultra-low carbon steel wire rod, with a wire rod specification of Ф8.0mm, and the chemical composition and its mass percentage of the wire rod are as follows: C: 0.0015%, Si: 0.005%, Mn: 0.034%, P: 0.008%, S: 0.004%, Al: 0.010%, N: 0.0015%, with the balance being Fe and unavoidable impurities. The technical solution is as follows: The production method for preventing the detachment of iron oxide scale from the aforementioned ultra-low carbon steel wire rod specifically includes the following steps: 1. Billet heating: The billet heating temperature is 1090℃.

[0057] 2. Rolling temperature: 1015℃ for pre-finishing rolling, 895℃ for finishing rolling, 895℃ for entering the double module, and 895℃ for wire drawing. Based on the control of microstructure and properties, lower rolling and wire drawing temperatures are used to control the thickness and structure of iron oxide scale, so as to avoid the scale from falling off due to excessive thickness, and also to avoid the scale from being too thin and difficult to remove by mechanical peeling.

[0058] 3. Cooling control process: Close the corresponding insulation cover 32m away from the spinning point, open all insulation covers at other locations, turn off all fans, the roller conveyor inlet speed is 0.45m / s, the cooling rate is 0.8℃ / s; the wire rod temperature at the outlet of the insulation cover is 735℃, and the cooling rate is 1.6℃ / s.

[0059] Wire rod microstructure and properties: The microstructure and properties are uniform, the iron oxide scale adhesion rate of copper-clad steel wire rod reaches 98%, and the iron oxide scale thickness is 18µm.

[0060] Example 8: A type of ultra-low carbon steel wire rod, with a wire rod specification of Ф10mm, has the following chemical composition and mass percentage: C: 0.0012%, Si: 0.003%, Mn: 0.032%, P: 0.007%, S: 0.003%, Al: 0.0060%, N: 0.0017%, with the balance being Fe and unavoidable impurities. The technical solution is as follows: The production method for preventing the detachment of iron oxide scale from the aforementioned ultra-low carbon steel wire rod specifically includes the following steps: 1. Billet heating: The billet heating temperature is 1130℃.

[0061] 2. Rolling temperature: 1025℃ for pre-finishing rolling, 915℃ for finishing rolling, 915℃ for entering the double module, and 905℃ for wire drawing. Based on the control of microstructure and properties, lower rolling and wire drawing temperatures are used to control the thickness and structure of iron oxide scale, so as to avoid the scale from falling off due to excessive thickness, and also to avoid the scale from being too thin and difficult to remove by mechanical peeling.

[0062] 3. Cooling control process: Close the corresponding insulation cover 40m away from the spinning point, open all insulation covers at other locations, turn off all fans, the roller conveyor inlet speed is 0.48m / s, the cooling rate is 0.7℃ / s; the wire rod temperature at the outlet of the insulation cover is 745℃, and the cooling rate is 1.4℃ / s.

[0063] Wire rod microstructure and properties: The microstructure and properties are uniform, the iron oxide scale adhesion rate of copper-clad steel wire rod reaches 99%, and the iron oxide scale thickness is 20µm.

[0064] Table 1 Comparison of the process of this invention with conventional processes Table 2 Comparison of wire rod performance between the process of this invention and conventional processes Table 1 compares the process of this invention with conventional processes. This invention significantly improves product performance through optimized component design and process control. As shown in Table 2, the iron oxide scale adhesion rate of wire rod produced using the process of this invention reaches 98%~100%, far exceeding the 60% level of conventional processes, fundamentally solving the industry problem of "black spots" formed by substrate oxidation due to iron scale detachment. Simultaneously, this invention precisely controls the iron oxide scale thickness within the range of 10~20µm, compared to the 2~30µm thickness of conventional processes. This not only makes the iron scale easier to remove but also significantly reduces drawing defects caused by residual iron scale. These technological breakthroughs bring significant comprehensive benefits: a 50%~80% reduction in wire breakage rate during drawing, approximately 35% reduction in die wear, and a 20%~30% reduction in user processing costs, providing a more efficient and economical solution for the production and application of copper-clad steel wire rod.

[0065] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A production method for preventing the detachment of iron oxide scale from ultra-low carbon steel wire rod, characterized in that, Ultra-low carbon steel wire rod is composed of the following chemical composition by weight percentage: C≤0.01%, Si≤0.01%, Mn≤0.08%, P≤0.015%, S≤0.010%, Al≤0.02%, N≤0.0040%, with the remainder being Fe and unavoidable impurities; The production method specifically includes the following steps: 1) Heating of steel billets: Heating temperature 1050~1150℃; 2) Rolling: Pre-rolling temperature: 980~1030℃; Finishing temperature: 880~930℃; Dual-module temperature: 880~930℃; Wire drawing temperature: 880~920℃. 3) Cooling control: The roller conveyor inlet speed is 0.30–0.50 m / s, and the cooling rate is 0.5–1.5 °C / s. The temperature of the insulation strip exiting the heat insulation cover is 700-750℃, and the cooling rate is 1-2.5℃ / s; Close the insulation cover 20-50m away from the silk-spinning area, and open all insulation covers in other locations. Turn off all fans.

2. The production method for preventing the detachment of iron oxide scale from ultra-low carbon steel wire rod according to claim 1, characterized in that, 3) The roller conveyor inlet speed is controlled according to the wire rod specifications: 0.30-0.40 m / s for Ф5.5~6.5mm wire rod and 0.40-0.50 m / s for Ф8.0~10.0mm steel.

3. The production method for preventing the detachment of iron oxide scale from ultra-low carbon steel wire rod according to claim 1, characterized in that, The oxide scale adhesion rate of ultra-low carbon steel wire rod is over 98%, and the oxide scale thickness is 10~20µm.

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