Cored wire

Abstract

The utility model discloses a cored wire. The cored wire comprises an inner core and a protective layer group, the inner core is of a solid cylindrical structure; the whole protective layer group is annular and is arranged around the periphery of the inner core, the protective layer group comprises an inner protective layer, an outer protective layer and an outer core, the inner protective layer and the outer protective layer are distributed at intervals in the radial direction of the inner core, the inner protective layer is attached to the periphery of the inner core, the outer core is clamped between the inner protective layer and the outer protective layer, and the melting point of the outer core is larger than that of the inner core. According to the cored wire, the melting rate of the cored wire can be delayed, and the yield of required elements in molten steel is increased.

Description

Technical Field

[0001] The present application belongs to the technical field of cored wires, and in particular relates to a cored wire. Background Art

[0002] Typically, cored wire is made of alloy powder wrapped in a steel strip and is primarily used to adjust the composition of special elements and treat inclusions during the refining process. Using cored wire for composition adjustment primarily aims to improve and stabilize alloy yield and control the composition of molten steel within a narrow range. This is currently the most common method used in the steel industry to enhance the stability of steel performance during the steelmaking process.

[0003] In the related art, the cored wire used in the steelmaking process, taking nitrogen-enhanced cored wire as an example, has a structure of strip steel wrapped with nitrogen-containing alloy powder. When it is inserted into the molten steel, the strip steel will melt quickly, resulting in a low nitrogen recovery rate in the molten steel. Utility Model Content

[0004] The present application provides a cored wire, which can slow down its own melting rate and improve the yield of required elements in molten steel.

[0005] An embodiment of the present application provides a cored wire, comprising: an inner core having a solid cylindrical structure; a protective layer group, which is generally annular and arranged around the outer circumference of the inner core, the protective layer group comprising an inner protective layer, an outer protective layer and an outer core, the inner protective layer and the outer protective layer being spaced apart along the radial direction of the inner core, the inner protective layer being attached to the outer circumference of the inner core, the outer core being clamped between the inner protective layer and the outer protective layer, and the melting point of the outer core being greater than the melting point of the inner core.

[0006] In some embodiments, the outer sheath includes at least one of a low carbon steel layer and a medium carbon steel layer.

[0007] In some embodiments, the inner sheath includes at least one of a low carbon steel layer and a medium carbon steel layer.

[0008] In some embodiments, the outer core includes one of a silicon iron core layer and a silicon nitride core layer.

[0009] In some embodiments, the outer core includes two or more core layers distributed along the radial direction of the inner core, and the melting points of the two or more core layers gradually decrease along the radial direction from the inner sheath to the outer sheath.

[0010] In some embodiments, the outer core includes two core layers, the two core layers including a silicon iron core layer and a silicon nitride core layer, and the silicon nitride core layer is located between the silicon iron core layer and the inner protective layer.

[0011] In some embodiments, along the axial direction of the inner core, the inner core is a uniform cross-sectional structure with equal cross-sectional areas at all locations.

[0012] In some embodiments, along the axial direction of the inner core, the inner core is a variable cross-section structure whose cross-sectional area changes periodically along a predetermined rule. The predetermined rule includes increasing first and then decreasing, decreasing in sections, or increasing. The shape of the inner wall surface of the inner protective layer matches the shape of the inner core.

[0013] In some embodiments, the predetermined pattern includes increasing first and then decreasing, the inner core includes multiple core material units along its own axis, two adjacent core material units are connected to each other, and each core material unit is spherical or ellipsoidal.

[0014] In some embodiments, along the radial direction of the inner core, the thicknesses of the inner sheath and the outer sheath are respectively smaller than the thickness of the outer core.

[0015] This application has at least the following beneficial effects:

[0016] The cored wire provided in this application includes an inner core and a protective layer assembly. The outer protective layer is generally annular and is disposed around the outer circumference of the inner core. The protective layer assembly includes an inner protective layer, an outer protective layer, and an outer core. The outer protective layer is used to secure the outer core, and the inner protective layer is used to secure the inner core. The melting point of the outer core is greater than that of the inner core. When the cored wire is inserted into an external medium, the outer core material has a higher melting point, ensuring that the cored wire does not melt before it reaches the bottom of the external medium. The inner core material has a lower melting point, so the inner core can only melt after the outer core melts, slowing its own melting rate and thereby increasing the recovery rate of elements required for molten steel, such as nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A side view of a cored wire provided in accordance with one embodiment of the present application;

[0019] Figure 2 A cross-sectional view of a cored wire provided in accordance with an embodiment of the present application;

[0020] Figure 3 A side view of a cored wire provided in accordance with another embodiment of the present application;

[0021] Figure 4 A cross-sectional view of a cored wire provided in another embodiment of the present application.

[0022] The following are the descriptions of the reference numerals:

[0023] 1. Inner core; 11. Core material unit;

[0024] 2. Protective layer group; 21. Inner protective layer; 22. Outer protective layer; 23. Outer core; 231. Silicon iron core layer; 232. Silicon nitride core layer. DETAILED DESCRIPTION

[0025] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0026] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0027] In the steelmaking process, cored wire, such as nitrogen-enhanced cored wire, consists of a steel strip wrapped around nitrogen-containing alloy powder. When inserted into the molten steel, the steel strip quickly melts. Furthermore, the nitrogen-containing alloy powder has a low density, so the high-melting-point portion of the powder tends to float, while the low-melting-point portion tends to vaporize. This results in a low yield of elements required for the molten steel, such as nitrogen.

[0028] Based on the above technical problems, an embodiment of the present application provides a new cored wire, which can slow down its own melting rate and improve the yield of required elements in molten steel.

[0029] In order to better understand the cored wire provided by one embodiment of the present application, the following will be combined with Figures 1 to 4 The cored wires provided in each embodiment of the present application are introduced in detail.

[0030] See also Figures 1 to 4The present invention provides a cored wire comprising an inner core 1 and a protective layer assembly 2. The inner core 1 is a solid cylindrical structure. The protective layer assembly 2 is annular and disposed around the outer circumference of the inner core 1. The protective layer assembly 2 comprises an inner protective layer 21, an outer protective layer 22, and an outer core 23. The inner protective layer 21 and the outer protective layer 22 are spaced apart along the radial direction of the inner core 1. The inner protective layer 21 is attached to the outer circumference of the inner core 1, and the outer core 23 is sandwiched between the inner protective layer 21 and the outer protective layer 22. The melting point of the outer core 23 is greater than that of the inner core 1.

[0031] The inner core 1 may be cylindrical, elliptical or polygonal, and may contain at least one of nitrogen, silicon and iron required for molten steel, and may optionally include nitrogen.

[0032] The protective layer group 2 matches the shape of the outer circumference of the inner core 1. For example, it can be a circular ring, an elliptical ring or a polygonal ring. The protective layer group 2 is arranged along the circumference of the inner core 1 and is tightly fitted to its outer circumference.

[0033] The inner protective layer 21, outer protective layer 22 and outer core 23 included in the protective layer group 2 can each be one layer or more than two layers. When there are more than two layers, they can be arranged in sequence according to the arrangement rule of the inner protective layer 21, outer core 23 and outer protective layer 22.

[0034] The inner sheath 21 , the outer sheath 22 and the outer core 23 may all be annular and have shapes matching each other.

[0035] The radius of the inner core 1 may be consistent with the radial width of the protective layer group 2 , or there may be a difference, or they may be consistent. Optionally, the radius of the inner core 1 may be greater than the radial width of the protective layer group 2 .

[0036] In summary, according to an embodiment of the present application, the cored wire provided includes an inner core 1 and a protective layer group 2. The outer protective layer is annular as a whole and is arranged around the outer circumference of the inner core 1. The protective layer group 2 includes an inner protective layer 21, an outer protective layer 22, and an outer core 23. The outer protective layer 22 is used to fix the outer core 23, and the inner protective layer 21 is used to fix the inner core 1. The melting point of the outer core 23 is greater than the melting point of the inner core 1. When the cored wire is inserted into an external medium, due to the higher melting point of the material of the outer core 23, it is ensured that the cored wire will not melt before it extends into the bottom of the external medium. The material of the inner core 1 has a lower melting point. After the outer core 23 melts, the inner core 1 can melt, thereby slowing down its own melting rate and effectively improving the recovery rate of elements required for molten steel, such as nitrogen.

[0037] In some embodiments, the inner sheath 21 includes at least one of a low carbon steel layer and a medium carbon steel layer.

[0038] In one embodiment of the present application, the cored wire is provided with an inner sheath 21 formed of a low-carbon steel layer or a medium-carbon steel layer. This sheath 21 wraps the inner core 1 at the lowest cost, thereby securing the inner core 1. Furthermore, the sheath 21 can be dissolved in molten steel without affecting the properties of the molten steel.

[0039] In some embodiments, the outer jacket 22 includes at least one of a low carbon steel layer and a medium carbon steel layer.

[0040] In one embodiment of the present application, the cored wire is provided with an outer sheath 22 formed of a low-carbon steel layer or a medium-carbon steel layer. This minimizes costs by encasing the outer core 23 between the inner sheath 21 and the outer sheath 22, thereby securing the outer core 23. Furthermore, the outer core 23 can be dissolved in molten steel without affecting the properties of the molten steel.

[0041] In some embodiments, the outer core 23 includes one of a silicon iron core layer 231 and a silicon nitride core layer 232 .

[0042] Optionally, the outer core 23 includes one of a silicon iron core layer 231 and a silicon nitride core layer 232 .

[0043] Of course, in some embodiments, the outer core 23 can also include a ferrosilicon core layer 231 and a silicon nitride core layer 232 at the same time. When both the ferrosilicon core layer 231 and the silicon nitride core layer 232 are included, the two can be stacked and the silicon nitride core layer 232 can be located on the side close to the inner protective layer 21.

[0044] Optionally, the melting point of the outer core 23 material needs to be greater than the melting point of the inner core 1 material, and it is necessary to avoid the outer core 23 from melting during the process of the cored wire being inserted into the molten steel, while at the same time ensuring that the outer core 23 can melt after the cored wire is inserted into the bottom of the molten steel.

[0045] In one embodiment of the present application, the cored wire provided by the present invention prevents the outer core 23 from melting during the insertion of the cored wire into the molten steel by configuring the outer core 23 to include either a silicon iron core layer 231 or a silicon nitride core layer 232. This effectively protects the inner core 1 during the insertion of the cored wire into the molten steel. Furthermore, as the silicon iron core layer 231 and the silicon nitride core layer 232 melt, they react with oxygen in the molten steel, releasing heat and causing the inner core 1 to melt rapidly.

[0046] In some embodiments, the outer core 23 includes two or more core layers distributed along the radial direction of the inner core 1 , and the melting points of the two or more core layers gradually decrease along the radial direction from the inner protective layer 21 to the outer protective layer 22 .

[0047] The outer core 23 may include two core layers distributed along the radial direction of the inner core 1 , or may include three or more core layers distributed along the radial direction of the inner core 1 .

[0048] The thicknesses of two adjacent core layers may be equal or may differ from each other. The difference may be selected so that the appropriate thickness can be adapted according to the required fusion time.

[0049] In one embodiment of the present application, the cored wire provides an outer core 23 comprising two or more core layers distributed radially along the inner core 1. This allows for the core layers to be matched with appropriate materials based on the desired delay time. This provides better protection for the inner core 1 during insertion into the molten steel. Furthermore, this configuration allows for the selection of appropriate core materials based on the molten steel's needs to replenish the required elements.

[0050] In some embodiments, the outer core 23 includes two core layers, including a ferrosilicon core layer 231 and a silicon nitride core layer 232 . The silicon nitride core layer 232 is located between the ferrosilicon core layer 231 and the inner protective layer 21 .

[0051] In the cored wire provided by one embodiment of the present application, the melting point of the ferrosilicon core layer 231 is slightly lower than the temperature of the molten steel, and the melting point of the silicon nitride core layer 232 is slightly higher than the temperature of the molten steel. By setting the outer core 23 as the ferrosilicon core layer 231 and the silicon nitride core layer 232, the outer core 23 can be prevented from melting when the cored wire is inserted into the molten steel. In addition, the outer core 23 can be melted when the cored wire is inserted into the bottom of the molten steel.

[0052] See also Figure 1 and Figure 2 In some embodiments, along the axial direction of the inner core 1 , the inner core 1 is a uniform cross-sectional structure with equal cross-sectional areas at all locations.

[0053] The cored wire provided in one embodiment of the present application is configured such that the inner core 1 is a uniform cross-sectional structure with equal cross-sectional areas at all locations. This facilitates processing and manufacturing and enables the inner core 1 to melt uniformly and stably.

[0054] In some embodiments, along the axial direction of the inner core 1, the inner core 1 is a variable cross-section structure whose cross-sectional area changes periodically along a predetermined rule. The predetermined rule includes increasing first and then decreasing, decreasing in sections, or increasing. The shape of the inner wall surface of the inner protective layer 21 matches the shape of the inner core 1.

[0055] The predetermined rule includes a step-by-step decrease or increase, which can be understood as: the inner core 1 is a structure with a conical cross section, or a structure with a trapezoidal cross section.

[0056] The cored wire provided in one embodiment of the present application can form an uneven concave-convex surface on the outer periphery of the inner core 1 through the above-mentioned setting, which can delay the melting process of the inner core 1 and increase the melting time of the inner core 1, thereby improving the yield of nitrogen elements and improving the stability of the yield.

[0057] See also Figure 3 and Figure 4 In some embodiments, the predetermined rule includes increasing first and then decreasing, and the inner core 1 includes multiple core material units 11 along its own axis. Two adjacent core material units 11 are connected to each other, and each core material unit 11 is spherical or ellipsoidal.

[0058] The cored wire provided in one embodiment of the present application increases the melting and deoxidation time of the outer core 23 through the above-mentioned arrangement, thereby delaying the melting process of the inner core 1 and reducing the degree of premature leakage of the inner core 1 from the top, thereby improving the yield of nitrogen and improving the stability of the yield.

[0059] In some embodiments, along the radial direction of the inner core 1 , the thicknesses of the inner sheath 21 and the outer sheath 22 are respectively smaller than the thickness of the outer core 23 .

[0060] In the cored wire provided by one embodiment of the present application, since the inner sheath 21 and the outer sheath 22 respectively serve to fix the inner core 1 and the outer core 23, the thickness of the inner sheath 21 and the outer sheath 22 are respectively set to be smaller than the thickness of the outer core 23, which can reduce costs and maximize the proportion of elements required by the molten steel included in the cored wire.

[0061] The above description is only a specific embodiment of the present application. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the scope of protection of the present application.

Claims

1. A cored wire, characterized in that: include: The inner core is a solid columnar structure; The protective layer group is annular as a whole and is arranged around the outer circumference of the inner core. The protective layer group includes an inner protective layer, an outer protective layer and an outer core. The inner protective layer and the outer protective layer are distributed at intervals along the radial direction of the inner core. The inner protective layer is attached to the outer circumference of the inner core, and the outer core is clamped between the inner protective layer and the outer protective layer. The melting point of the outer core is greater than the melting point of the inner core.

2. The cored wire according to claim 1, characterized in that The outer sheath includes at least one of a low carbon steel layer and a medium carbon steel layer.

3. The cored wire according to claim 1, characterized in that The inner protective layer includes at least one of a low carbon steel layer and a medium carbon steel layer.

4. The cored wire according to claim 1, characterized in that The outer core includes one of a silicon iron core layer and a silicon nitride core layer.

5. The cored wire according to claim 1, characterized in that The outer core includes two or more core layers distributed along the radial direction of the inner core. The melting points of the two or more core layers gradually decrease along the radial direction and in the direction from the inner protective layer to the outer protective layer.

6. The cored wire according to claim 5, characterized in that The outer core includes two core layers, which include a ferrosilicon core layer and a silicon nitride core layer. The silicon nitride core layer is located between the ferrosilicon core layer and the inner protective layer.

7. The cored wire according to any one of claims 1 to 6, characterized in that: Along the axial direction of the inner core, the inner core is a uniform cross-sectional structure with equal cross-sectional areas at all locations.

8. The cored wire according to any one of claims 1 to 6, characterized in that: Along the axial direction of the inner core, the inner core is a variable cross-section structure whose cross-sectional area changes periodically along a predetermined rule. The predetermined rule includes one of increasing first and then decreasing, decreasing step by step, or increasing. The shape of the inner wall surface of the inner protective layer matches the shape of the inner core.

9. The cored wire according to claim 8, characterized in that The predetermined rule includes increasing first and then decreasing. The inner core includes a plurality of core material units along its own axial direction. Two adjacent core material units are connected to each other. Each core material unit is spherical or ellipsoidal.

10. The cored wire according to any one of claims 1 to 6, characterized in that: Along the radial direction of the inner core, the thicknesses of the inner protective layer and the outer protective layer are respectively smaller than the thickness of the outer core.

Images