Production method and application of copper-coated steel

Abstract

The invention relates to a production method and application of copper-coated steel, and belongs to the technical field of hot melting continuous casting. The invention provides a production method of copper-coated steel. The method comprises a hot melting continuous casting step, the hot melting continuous casting step comprises the following steps: preheating a steel wire to 500-800 DEG C, heating molten copper in a copper melting furnace to 1120-1220 DEG C, enabling the steel wire to pass through the copper melting furnace according to a feeding traction speed of 30-50 cm / min, coating the surface of the steel wire with the molten copper, and performing cold crystallization on the surface of the steel wire to form a copper layer. According to the method, by controlling the steel wire temperature, the copper liquid temperature and the contact time of the steel wire and the copper liquid, on one hand, interpenetration of copper and steel on the contact surface is increased, then the binding force of the copper and steel on the contact surface is improved, on the other hand, copper is evenly crystallized on the surface of a steel core, and the conditions of lines, copper exposure and the like are avoided; and therefore, the bonding quality between copper and steel is ensured.

Description

Technical Field

[0001] The invention relates to a production method of copper-clad steel and application thereof, belonging to the technical field of hot-melt continuous casting. Background Art

[0002] Copper-clad steel refers to a material whose surface is uniformly coated with copper on the steel core, including copper-clad steel bars, copper-clad steel plates, and copper-clad steel wires (including round wires and stranded wires). Copper-clad steel has the high strength, excellent elasticity, large thermal resistance, and high magnetic conductivity of steel, as well as the good electrical conductivity and excellent corrosion resistance of copper. Therefore, copper-clad steel is widely used in the preparation of grounding and lightning protection devices (such as grounding rods, grounding wires, down conductors, lightning conductors, and lightning rods), signal transmission devices (such as coaxial cable inner conductors, electronic pins, telephone lead-in wires, and wave transmission reflection nets), and load-bearing cables (such as railway suspension strings, current-carrying load-bearing cables, and locomotive traction cables).

[0003] At present, the production processes of copper-clad steel mainly include electroplating, cladding and horizontal continuous casting. Among them, the horizontal continuous casting method can solve the problem of thin copper layer in the electroplating method and poor copper-steel bonding in the cladding method. However, the process of the horizontal continuous casting method is very complicated, and the specific settings of each link will affect the quality of the copper-clad steel billet produced in the end. Therefore, it is very important to continuously optimize the horizontal continuous casting method to improve the production quality of copper-clad steel billets. Summary of the invention

[0004] To solve the above problems, the present invention provides a method for producing copper-clad steel, which comprises a hot-melt continuous casting step; the hot-melt continuous casting step is: preheating a steel wire to a temperature of 500-800°C, heating molten copper to a temperature of 1120-1220°C in a copper melting furnace, and then passing the steel wire through the copper melting furnace at a feed pulling speed of 30-50 cm / min, so that the molten copper is coated on the surface of the steel wire and cold crystallized to form a copper layer on the surface of the steel wire.

[0005] In one embodiment of the present invention, the hot melt continuous casting step is: preheating the steel wire to a temperature of 650°C, heating the molten copper to a temperature of 1150°C in a copper melting furnace, and then passing the steel wire through the copper melting furnace at a feed pulling speed of 35 cm / min, so that the molten copper is coated on the surface of the steel wire and cold crystallized to form a copper layer on the surface of the steel wire.

[0006] In one embodiment of the present invention, the feeding method of the steel wire in the copper melting furnace is intermittent feeding; the feeding frequency of the intermittent feeding is 10 to 20 times / min, and the pause time between each feeding is 0.4 to 0.8s.

[0007] In one embodiment of the present invention, the feeding frequency of the intermittent feeding is 15 times / min, and the pause time between each feeding is 0.45s.

[0008] In one embodiment of the present invention, the vertical height difference between the liquid surface of the molten copper and the crystallizer of the copper melting furnace is 20 to 25 cm.

[0009] In one embodiment of the present invention, the vertical height difference between the copper liquid level and the crystallizer of the copper melting furnace is 25 cm.

[0010] In one embodiment of the present invention, the inner diameter of the core ring of the copper melting furnace is 0.025 to 0.035 cm larger than the diameter of the steel wire.

[0011] In one embodiment of the present invention, the inner diameter of the core ring of the copper melting furnace is 0.030 cm larger than the diameter of the steel wire.

[0012] In one embodiment of the present invention, before the hot melt continuous casting step, the method further comprises a fine grinding and polishing step.

[0013] In one embodiment of the present invention, the method further comprises a straightening step before the fine grinding and polishing step.

[0014] In one embodiment of the present invention, before the straightening step, the method further comprises a grinding step.

[0015] In one embodiment of the present invention, the method further comprises a cooling step before the grinding step.

[0016] In one embodiment of the present invention, the method further comprises a welding step before the primary cooling step.

[0017] In one embodiment of the present invention, before the welding step, the method further comprises a stripping and drawing step.

[0018] In one embodiment of the present invention, after the hot melt continuous casting step, the method further comprises a secondary cooling step.

[0019] The invention also provides application of the production method in producing copper-clad steel.

[0020] The technical solution of the present invention has the following advantages:

[0021] The present invention provides a method for producing copper-clad steel, the method comprising a hot melt continuous casting step; the hot melt continuous casting step is: preheating a steel wire to a temperature of 500-800°C, heating molten copper to a temperature of 1120-1220°C in a copper melting furnace, and then passing the steel wire through the copper melting furnace at a feed pulling speed of 30-50 cm / min, so that the molten copper is coated on the surface of the steel wire, and cold crystallization forms a copper layer on the surface of the steel wire. The hot melt continuous casting process belongs to a liquid-solid phase composite process, which is produced at a high temperature, the surface of the steel core is in a molten state, and the copper and steel penetrate each other on the surface of the steel core to form an alloy layer. The method controls the temperature of the steel wire, the temperature of the copper liquid, and the contact time between the steel wire and the copper liquid. On the one hand, the mutual penetration of copper and steel at the contact surface is increased, thereby improving the bonding force of copper and steel at the contact surface. On the other hand, the copper is uniformly crystallized on the surface of the steel core to avoid the occurrence of lines, copper exposure, etc., thereby ensuring the bonding quality between copper and steel. Therefore, the copper-clad steel prepared by the method has the advantage of good deep processing performance and is more adaptable to complex construction environments and requirements in actual applications. For example, bending may be required during construction, or scratches are inevitable.

[0022] Furthermore, the feeding method of the steel wire in the copper melting furnace is intermittent feeding; the feeding frequency of the intermittent feeding is 10 to 20 times / min, and the pause time between each feeding is 0.4 to 0.8 seconds. The method controls the feeding method of the steel wire in the copper melting furnace, so that the copper liquid can be better and more uniformly cold-crystallized on the surface of the steel wire, thereby improving the deep processing performance, density and strength performance of the copper-clad steel.

[0023] Furthermore, the pouring mold of the copper melting furnace is provided with a centering ring. The method uses a copper melting furnace with a pouring mold provided with a centering ring, so that the copper liquid can be evenly wrapped on the surface of the steel wire, thereby improving the concentricity of the copper-clad steel.

[0024] Furthermore, the vertical height difference between the copper liquid level and the crystallizer of the copper melting furnace is 20 to 25 cm. The method optimizes the pressure of the copper liquid entering the crystallizer by controlling the vertical height difference between the copper liquid level and the crystallizer of the copper melting furnace, thereby effectively improving the bonding quality between copper and steel.

[0025] Furthermore, the inner diameter of the core ring of the copper melting furnace is 0.025-0.035 cm larger than the diameter of the steel wire. The method controls the inner diameter of the core ring of the copper melting furnace so that the steel wire can smoothly pass through the core ring and the crystallizer of the copper melting furnace without affecting the concentricity of the copper-clad steel.

[0026] Furthermore, the method is provided with a straightening step. By providing the straightening step, the method enables the straightening step to work together with the centering ring to effectively ensure the concentricity of the copper-clad steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 : The concentricity of the copper-clad steel blank produced in Example 1.

[0028] Figure 2 : Concentricity of the copper-clad steel blank produced in Comparative Example 11.

[0029] Figure 3 : Concentricity of the copper-clad steel blank produced in Comparative Example 12.

[0030] Figure 4 : Concentricity of the copper-clad steel blank produced in Comparative Example 14.

[0031] Figure 5 : Concentricity of the copper-clad steel blank produced in Comparative Example 16.

[0032] Figure 6 : Photograph of the copper-clad steel blank produced in Comparative Example 1.

[0033] Figure 7 : Photograph of the copper-clad steel blank produced in Comparative Example 2.

[0034] Figure 8 : Photograph of the copper-clad steel blank produced in Comparative Example 3.

[0035] Fig. 9 : Photograph of the copper-clad steel blank produced in Comparative Example 4.

[0036] Fig.10 : Photograph of the copper-clad steel blank produced in Comparative Example 5.

[0037] Fig.11 : Photograph of the copper-clad steel billet produced in Comparative Example 6.

[0038] Fig.12 : Photograph of the copper-clad steel blank produced in Example 1 after thread cutting.

[0039] Fig.13 : Photograph of the copper-clad steel blank produced in Comparative Example 9 after thread cutting.

[0040] Fig.14 : Photograph of the copper-clad steel blank produced in Example 1 after parallel cutting.

[0041] Fig.15 : Photograph of the copper-clad steel blank produced in Comparative Example 9 after parallel cutting.

[0042] Fig.16 : The high current impact resistance of the copper-clad steel blank produced in Example 1.

[0043] Fig.17: The high current impact resistance of the copper-clad steel blank produced in Comparative Example 13.

[0044] Fig.18 : Photograph of the copper-clad steel blank produced in Example 1 after bending.

[0045] Fig.19 : Photograph of the copper-clad steel blank produced in Comparative Example 8 after bending.

[0046] Fig. 20 : Photos of the copper-clad steel blanks produced in Comparative Examples 9 to 10 after bending.

[0047] Fig.21 : Photograph of the copper-clad steel blank produced in Comparative Example 15 after bending.

[0048] Fig. 22 : Metallographic photograph of the copper-steel interface of the copper-clad steel blank produced in Example 1.

[0049] Fig.23 : Metallographic photograph of the copper-steel interface of the copper-clad steel blank produced in Comparative Example 15.

[0050] Fig.24 : The energy spectrum analysis results of the copper-steel diffusion layer of the copper-clad steel blank produced in Example 1.

[0051] Fig.25 : Energy spectrum analysis results of the copper-steel diffusion layer of the copper-clad steel blank produced in Comparative Example 15. DETAILED DESCRIPTION

[0052] The following examples are provided for a better understanding of the present invention, but are not intended to limit the best mode of implementation, nor to limit the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior arts shall fall within the protection scope of the present invention.

[0053] If no specific experimental steps or conditions are specified in the following examples, the conventional experimental steps or conditions described in the literature in the field can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be purchased commercially.

[0054] Example 1: A method for producing copper-clad steel

[0055] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0056] Shelling and drawing steps: using the device recorded in CN216095659U to input the raw material round steel into the device recorded in CN213381821U through the device recorded in CN216095659U to obtain the steel wire after shelling and drawing; during the shelling and drawing process, the round steel with a diameter of 30 mm is peeled into a steel wire with a diameter of 29.2 mm by the peeling disk of the device recorded in CN213381821U;

[0057] Welding step: welding the interface between the two coils of steel wire to obtain a welded steel wire;

[0058] Primary cooling step: air cooling the interface of the welded steel wire to obtain a primary cooled steel wire;

[0059] Grinding step: using the device described in CN213257526U to grind the interface of the cooled steel wire to obtain a grinded steel wire (if only one roll of steel wire needs to be processed, the welding step, the cooling step and the grinding step are all omitted);

[0060] Straightening step: using the device described in CN114505369A to straighten the polished steel wire to obtain a straightened steel wire;

[0061] Fine grinding and polishing step: firstly use the device described in Example 2 of CN218110233U to finely grind the straightened steel wire, and then use the device described in CN206588764U to polish the secondary straightened steel wire to obtain a finely ground and polished steel wire;

[0062] Hot-melt continuous casting steps: using the copper melting furnace described in CN218120590U (the crystallizer, pouring mold and core ring structure of the copper melting furnace are shown in CN217474800U and CN217492627U), preheating the steel wire to a temperature of 650°C, and heating the molten copper to a temperature of 1150°C in the copper melting furnace, and then passing the steel wire through the copper melting furnace at a feeding and pulling speed of 35 cm / min, so that the molten copper is coated on the surface of the steel wire, and cold crystallized on the surface of the steel wire to form a copper layer, thereby obtaining a steel wire subjected to hot-melt continuous casting; during the hot-melt continuous casting process, the feeding method of the steel wire in the copper melting furnace is intermittent feeding, and the feeding frequency of the intermittent feeding is The feeding rate is 15 times / min, the pause time between each feeding is 0.45s, the vertical height difference between the copper liquid level and the crystallizer of the copper melting furnace is 25cm, and the inner diameter of the core ring of the copper melting furnace is 0.030cm larger than the diameter of the steel wire (the feeding mode here is controlled by the traction mechanism of the device used in each step, and the traction mechanism used is a stepping motor, and the traction mechanism of the device used in each step is consistent during operation; here the steel wire enters the copper liquid through the second crystallizer, leaves the copper liquid through the first crystallizer, and the cold crystallization process of the copper liquid on the surface of the steel wire is completed in the first crystallizer, and the process of the steel wire entering the second crystallizer is carried out under the protection of nitrogen);

[0063] Secondary cooling step: The hot-melt cast steel wire is cooled to room temperature (25° C.) to obtain a copper-clad steel blank with a diameter of 33 mm.

[0064] Example 2: A method for producing copper-clad steel

[0065] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0066] Based on Example 1, the preheating temperature of the steel wire was adjusted to 500°C.

[0067] Example 3: A method for producing copper-clad steel

[0068] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0069] On the basis of Example 1, the preheating temperature of the steel wire was adjusted to 800°C.

[0070] Example 4: A method for producing copper-clad steel

[0071] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0072] On the basis of Example 1, the heating temperature of the copper liquid was adjusted to 1120°C.

[0073] Example 5: A method for producing copper-clad steel

[0074] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0075] On the basis of Example 1, the heating temperature of the copper liquid was adjusted to 1220°C.

[0076] Example 6: A method for producing copper-clad steel

[0077] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0078] Based on Example 1, the feed pulling speed was adjusted to 30 cm / min.

[0079] Example 7: A method for producing copper-clad steel

[0080] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0081] Based on Example 1, the feed pulling speed was adjusted to 50 cm / min.

[0082] Example 8: A method for producing copper-clad steel

[0083] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0084] On the basis of Example 1, the feeding frequency of the intermittent feeding was adjusted to 10 times / min.

[0085] Example 9: A method for producing copper-clad steel

[0086] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0087] On the basis of Example 1, the feeding frequency of the intermittent feeding was adjusted to 20 times / min.

[0088] Example 10: A method for producing copper-clad steel

[0089] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0090] Based on Example 1, the pause time between each feeding was adjusted to 0.4 s.

[0091] Example 11: A method for producing copper-clad steel

[0092] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0093] Based on Example 1, the pause time between each feeding was adjusted to 0.8 s.

[0094] Example 10: A method for producing copper-clad steel

[0095] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0096] On the basis of Example 1, the vertical height difference between the copper liquid level and the crystallizer of the copper melting furnace was adjusted to 20 cm.

[0097] Example 11: A method for producing copper-clad steel

[0098] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0099] On the basis of Example 1, the vertical height difference between the copper liquid level and the crystallizer of the copper melting furnace was adjusted to 22 cm.

[0100] Example 12: A method for producing copper-clad steel

[0101] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0102] On the basis of Example 1, the inner diameter of the core ring of the copper melting furnace is adjusted to be 0.035 cm larger than the diameter of the steel wire.

[0103] Example 13: A method for producing copper-clad steel

[0104] This embodiment provides a method for producing copper-clad steel, comprising the following steps:

[0105] On the basis of Example 1, the inner diameter of the core ring of the copper melting furnace is adjusted to be 0.025 cm larger than the diameter of the steel wire.

[0106] Comparative Example 1: A method for producing copper-clad steel

[0107] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0108] On the basis of Example 1, the preheating temperature of the steel wire was adjusted to 450°C.

[0109] Comparative Example 2: A method for producing copper-clad steel

[0110] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0111] On the basis of Example 1, the preheating temperature of the steel wire was adjusted to 900°C.

[0112] Comparative Example 3: A method for producing copper-clad steel

[0113] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0114] On the basis of Example 1, the heating temperature of the copper liquid was adjusted to 1090°C.

[0115] Comparative Example 4: A method for producing copper-clad steel

[0116] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0117] On the basis of Example 1, the heating temperature of the copper liquid was adjusted to 1300°C.

[0118] Comparative Example 5: A method for producing copper-clad steel

[0119] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0120] Based on Example 1, the feed pulling speed was adjusted to 25 cm / min.

[0121] Comparative Example 6: A method for producing copper-clad steel

[0122] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0123] Based on Example 1, the feed pulling speed was adjusted to 55 cm / min.

[0124] Comparative Example 7: A method for producing copper-clad steel

[0125] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0126] On the basis of Example 1, the feeding frequency of intermittent feeding was adjusted to 8 times / min.

[0127] Comparative Example 8: A method for producing copper-clad steel

[0128] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0129] Based on Example 1, the feeding frequency of the intermittent feeding was adjusted to 22 times / min.

[0130] Comparative Example 9: A method for producing copper-clad steel

[0131] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0132] On the basis of Example 1, the vertical height difference between the copper liquid level and the crystallizer of the copper melting furnace was adjusted to 15 cm.

[0133] Comparative Example 10: A method for producing copper-clad steel

[0134] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0135] On the basis of Example 1, the vertical height difference between the copper liquid level and the crystallizer of the copper melting furnace was adjusted to 30 cm.

[0136] Comparative Example 11: A method for producing copper-clad steel

[0137] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0138] On the basis of Example 1, the inner diameter of the core ring of the copper melting furnace is adjusted to be 0.020 cm larger than the diameter of the steel wire.

[0139] Comparative Example 12: A method for producing copper-clad steel

[0140] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0141] On the basis of Example 1, the inner diameter of the core ring of the copper melting furnace is adjusted to be 0.040 cm larger than the diameter of the steel wire.

[0142] Comparative Example 13: A method for producing copper-clad steel

[0143] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0144] Based on Example 1, the fine grinding and polishing step was adjusted to pickling.

[0145] Comparative Example 14: A method for producing copper-clad steel

[0146] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0147] On the basis of Example 1, the core ring in the copper melting furnace crystallizer is removed.

[0148] Comparative Example 15: A method for producing copper-clad steel

[0149] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0150] Based on Example 1, the hot melt continuous casting step is adjusted to electroplating.

[0151] Comparative Example 16: A method for producing copper-clad steel

[0152] This comparative example provides a method for producing copper-clad steel, comprising the following steps:

[0153] Based on Example 1, the straightening step is removed.

[0154] Experimental Example 1: Performance test of copper-clad steel blank

[0155] Referring to the electric power industry standard DL / T 1312-2013 of the People's Republic of China "Technical Conditions for Copper-clad Steel for Grounding of Power Engineering" and the enterprise standard Q / GDW 1466-2014 of the State Grid Corporation of China "Technical Conditions for Copper-clad Steel for Grounding of Electrical Engineering", the concentricity of the copper-clad steel blanks produced in Examples 1 to 13 and Comparative Examples 1 to 15 (observing the cross section of the copper-clad steel blanks), the copper-steel bonding strength (observing whether the copper layer of the copper-clad steel blanks is intact, for example, whether there are lines and exposed copper on the surface of the copper-clad steel blanks), the deep processing performance (thread cutting and parallel cutting of the copper-clad steel blanks are performed to observe whether copper-steel separation occurs in the copper-clad steel blanks), the density, the resistance to large current impact (subjecting large current impact to the copper-clad steel blanks to observe whether bubbling and cracks occur in the copper layer of the copper-clad steel blanks) and the bending resistance (bending the copper-clad steel blanks to observe whether the copper-clad steel blanks are broken and whether copper-steel separation occurs), the test results are shown in Table 1. Figures 1 to 25 .

[0156] Figures 1 to 5 The concentricity of the copper-clad steel blank produced in Example 1 is much better than that of the copper-clad steel blanks produced in Comparative Examples 11, 12, 14 and 16. In addition, it is found in the actual production process that the hot melt continuous casting process of Comparative Example 11 is prone to damage the mold when producing copper-clad steel blanks. Figures 6 to 15 In the embodiment 1, compared with the processes of comparative examples 1 to 6 and 9, the copper-steel interface of the copper-clad steel blank produced by the hot-melt continuous casting process is that the copper and steel interlock with each other, the contact area is large, the copper-steel bonding force is stronger, and the deep processing performance is better. In addition, in the actual production process, it is also found that the copper-clad steel blank produced by the hot-melt continuous casting process of comparative example 2 is easy to deform before entering the furnace and has poor concentricity. The copper liquid temperature used in the hot-melt continuous casting process of comparative example 3 is low and cannot be fully crystallized. The copper-clad steel blank produced by it may expose copper. The copper liquid temperature used in the hot-melt continuous casting process of comparative example 4 is high and the energy consumption is high. The hot-melt continuous casting process of comparative example 5 has a slow feeding and pulling speed, and the hot-melt continuous casting process of comparative example 7 has a low feeding frequency, and both have the problem of low output. The hot-melt continuous casting process of comparative example 6 has a fast feeding and pulling speed, and the hot-melt continuous casting process of comparative example 8 has a fast feeding frequency, and both have the problem that the copper liquid cannot be fully crystallized. Figures 16-17 The high current impact resistance of the copper-clad steel blank produced in Example 1 is much better than that of the copper-clad steel blank produced in Comparative Example 13. Figures 18 to 21 In the present invention, compared with the processes of comparative examples 8 to 10 and 15, the copper-clad steel blank produced by the hot melt continuous casting process of Example 1 has better bending resistance. In addition, it is found in the actual production process that the hot melt continuous casting process of comparative example 10 requires more molten copper to be melted in the copper melting furnace, which has the problem of high cost. Figures 22 to 25 Among them, the copper-steel diffusion layer thickness of the copper-clad steel blank produced by the electroplating process of Comparative Example 15 is about 4.24μm (length: 212μm, a total of 100 points, and a point spacing of 2.12μm), while the copper-clad steel blank produced by the hot-melt continuous casting process of Example 1 has a copper-steel diffusion layer thickness of about 11.6μm (length: 232μm, a total of 100 points, and a point spacing of 2.32μm), which is significantly better than the electroplating product, showing better interface bonding strength.

[0157] Depend on Figures 1 to 25 The test results show that: the production methods of Examples 1 to 13 control the temperature of the steel wire, the temperature of the copper liquid and the contact time between the steel wire and the copper liquid. On the one hand, the mutual penetration of copper and steel at the contact surface is increased, thereby improving the bonding force of copper and steel at the contact surface. On the other hand, the copper is uniformly crystallized on the surface of the steel core to avoid the occurrence of lines, copper exposure, etc., thereby ensuring the bonding quality between copper and steel; the production methods of Examples 1 to 13 control the feeding method of the steel wire in the copper melting furnace so that the copper liquid can better and uniformly cold crystallize on the surface of the steel wire, thereby improving the deep processing performance, density and strength performance of the copper-clad steel; the production methods of Examples 1 to 13 select a casting mold with The copper-melting furnace with a core ring allows the molten copper to be evenly wrapped on the surface of the steel wire, thereby improving the concentricity of the copper-clad steel; the production methods of Examples 1 to 13 optimize the pressure of the molten copper entering the crystallizer by controlling the vertical height difference between the copper liquid level and the crystallizer of the copper-melting furnace, thereby effectively improving the bonding quality between copper and steel; the production methods of Examples 1 to 13 control the inner diameter of the core ring of the copper-melting furnace so that the steel wire can smoothly pass through the core ring and crystallizer of the copper-melting furnace without affecting the concentricity of the copper-clad steel; and the production methods of Examples 1 to 13 provide a straightening step so that the straightening step can work together with the core ring to effectively ensure the concentricity of the copper-clad steel.

[0158] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for producing copper-clad steel, characterized in that: The method comprises a hot melt continuous casting step; the hot melt continuous casting step comprises: preheating the steel wire to a temperature of 500 to 800° C., heating the molten copper to a temperature of 1120 to 1220° C. in a copper melting furnace, and then passing the steel wire through the copper melting furnace at a feed pulling speed of 30 to 50 cm / min, so that the molten copper is coated on the surface of the steel wire and cold crystallized to form a copper layer on the surface of the steel wire.

2. The production method according to claim 1, characterized in that The feeding method of the steel wire in the copper melting furnace is intermittent feeding; the feeding frequency of the intermittent feeding is 10 to 20 times / min, and the pause time between each feeding is 0.4 to 0.8s.

3. The production method according to claim 1 or 2, characterized in that The vertical height difference between the copper liquid level and the crystallizer of the copper melting furnace is 20 to 25 cm.

4. The production method according to any one of claims 1 to 3, characterized in that: The inner diameter of the core ring of the copper melting furnace is 0.025 to 0.035 cm larger than the diameter of the steel wire.

5. The production method according to any one of claims 1 to 4, characterized in that: Before the hot melt continuous casting step, the method further comprises a fine grinding and polishing step.

6. The production method according to claim 5, characterized in that Prior to the fine grinding and polishing step, the method further comprises a straightening step.

7. The production method according to claim 6, characterized in that Prior to the straightening step, the method further comprises a grinding step.

8. The production method according to claim 7, characterized in that Prior to the grinding step, the method further comprises a cooling step.

9. The production method according to any one of claims 1 to 8, characterized in that: After the hot melt continuous casting step, the method further comprises a secondary cooling step.

10. Use of the production method according to any one of claims 1 to 9 in the production of copper-clad steel.

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