High-strength pipe seam type anchor rod and preparation method thereof
By adding elements such as W, Mo, Nb to the iron matrix of the tube seam anchor and combining them with oxide fibers and nitride particles, the problem of low mechanical strength of existing anchors is solved and higher tensile resistance is achieved and yield strength.
Patent Information
- Application Number
- CN202411674472.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-02-11
AI Technical Summary
The existing tube joint anchors have low mechanical strength and are difficult to meet the higher strength needs in the geological environment.
By adding metal elements such as W, Mo, Nb to the iron matrix, and combining oxide fibers and nitride particles, the tempering stability and hardness of the matrix alloy are optimized and the mechanical strength of the anchor is enhanced.
The tensile strength and yield strength of the tube joint anchors are significantly improved, meeting the demand for higher mechanical strength.
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of pipe seam anchor rods, and in particular to a high-strength pipe seam anchor rod and a preparation method thereof. Background Art
[0002] The pipe-slit anchor is a new type of full-length anchor that is widely used in geological environments such as mines and can actively reinforce the surrounding rock. It has the characteristics of simple installation, good corrosion resistance, and excellent reinforcement effect. The three-dimensional part of the pipe-slit anchor is a steel pipe with a longitudinal slit. When in use, it can apply pressure and friction to the surrounding rock over the entire length. Combined with the supporting force of the anchor tray, the rock mass is evenly stressed and the rock formation is stable. In the use of geological environments, the strength of the pipe-slit anchor is given higher requirements. However, the mechanical strength of the pipe-slit anchor is still relatively low. Therefore, it is very important to study a high-strength pipe-slit anchor. Summary of the invention
[0003] The present invention provides a high-strength pipe-seam type anchor rod and a preparation method thereof, which solves the problem of low mechanical strength of the pipe-seam type anchor rod in the related art.
[0004] The technical solution of the present invention is as follows: The invention provides a high-strength pipe-seam type anchor rod, comprising a matrix and a reinforcement phase, wherein the matrix is composed of the following elements by weight percentage: C 0.32%-0.45%, Ni 1.2%-1.8%, Cr 1.2%-1.5%, S 0.001%-0.01%, P0.001%-0.01%, Co 0.2%-0.5%, Mn 0.2%-0.6%, Al 0.05%-0.1%, Cu 0.35%-0.75%, Ce 0.05%-0.1%, W 0.02%-0.05%, Mo 0.002%-0.015%, Nb 0.03%-0.06%, and the balance is Fe and inevitable impurities.
[0005] As a further technical solution, the mass percentages of W, Mo and Nb satisfy the following relationship: 0.3≤(0.5W+5Mo) / 2Nb≤0.75.
[0006] The present invention further enhances the mechanical strength of the pipe-seam anchor by limiting 0.3≤(0.5W+5Mo) / 2Nb≤0.75.
[0007] As a further technical solution, the reinforcing phase includes oxide fibers and nitride particles in a mass ratio of 3:7 to 7:3, the oxide fibers include one or more of aluminum oxide fibers, zirconium oxide fibers, and magnesium oxide fibers, and the nitride particles are aluminum nitride particles.
[0008] As a further technical solution, the oxide fiber is zirconium oxide fiber.
[0009] As a further technical solution, the diameter of the zirconia fiber is 2-4 μm and the length is 20-300 μm.
[0010] The present invention further enhances the mechanical strength of the pipe seam anchor by limiting the diameter of the zirconium oxide fiber to 2-4 μm and the length to 20-300 μm.
[0011] As a further technical solution, the aluminum nitride particles are manganese oxide-coated aluminum nitride particles.
[0012] The present invention further enhances the mechanical strength of the pipe-seam type anchor rod by limiting the aluminum nitride particles to aluminum nitride particles coated with manganese oxide.
[0013] As a further technical solution, the raw materials of the manganese oxide-coated aluminum nitride particles include manganese oxide and aluminum nitride particles in a mass ratio of 1 to 5:25.
[0014] As a further technical solution, the raw materials of the manganese oxide-coated aluminum nitride particles include manganese oxide and aluminum nitride particles in a mass ratio of 3:25.
[0015] The present invention further enhances the mechanical strength of the pipe-seam type anchor by limiting the raw materials of the manganese oxide-coated aluminum nitride particles to include manganese oxide and aluminum nitride particles in a mass ratio of 3:25.
[0016] As a further technical solution, the mass ratio of the matrix to the reinforcement phase is 100:1~2.
[0017] The present invention also provides a method for preparing a high-strength pipe seam anchor rod, comprising the following steps: S1, mixing manganese oxide and aluminum nitride particles evenly, and grinding to obtain manganese oxide-coated aluminum nitride particles; S2, after the materials are mixed according to the components of the matrix, smelting and refining are performed to obtain molten steel; S3. Manganese oxide-coated aluminum nitride particles and oxide fibers are added to the molten steel and evenly dispersed, and then continuous casting and heat treatment are performed to obtain a high-strength pipe-seam anchor.
[0018] The working principle and beneficial effects of the present invention are: In the present invention, by adding metal elements such as W, Mo, Nb, etc. into the iron matrix, the tempering stability, hardenability and hardness of the matrix alloy are enhanced, and the overheating sensitivity of the alloy is reduced. At the same time, by adjusting and optimizing the contents of various components such as C, Ni, Cr, S, P, Co, Mn, Al, Cu, Ce, etc. in the matrix, the mechanical strength of the pipe seam anchor is enhanced. DETAILED DESCRIPTION
[0019] The following will be combined with 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.
[0020] In the following examples and comparative examples, the parameters of the raw materials are as follows: Zirconia fiber A: diameter 2~4μm, length 2~40μm; Zirconia fiber B: diameter 2~4μm, length 20~300μm; The particle size of the aluminum nitride particles was 1250 mesh.
[0021] Example 1 A high-strength pipe-seam anchor, comprising a matrix and a reinforcement phase with a mass ratio of 100:1, wherein the matrix is composed of the following elements by weight percentage: C 0.32%, Ni 1.2%, Cr 1.2%, S 0.001%, P 0.001%, Co 0.2%, Mn 0.2%, Al 0.05%, Cu 0.35%, Ce 0.05%, W 0.02%, Mo 0.002%, Nb 0.06%, and the balance is Fe and unavoidable impurities; (0.5W+5Mo) / 2Nb=1 / 6, and the reinforcement phase is composed of aluminum nitride particles and zirconium oxide fibers A with a mass ratio of 7:3; The preparation method thereof comprises the following steps: S1. After the materials are prepared according to the components of the matrix, smelting and refining are performed to obtain molten steel; S2. After adding the reinforcing phase into the molten steel and mixing evenly, continuous casting is performed, quenched at 850°C and kept warm for 3 hours, tempered at 500°C and kept warm for 6 hours, and a high-strength pipe-seam anchor is obtained.
[0022] Example 2 A high-strength pipe-seam anchor, comprising a matrix and a reinforcement phase with a mass ratio of 100:2, wherein the matrix is composed of the following elements by weight percentage: C 0.45%, Ni 1.8%, Cr 1.5%, S 0.01%, P 0.01%, Co 0.5%, Mn 0.6%, Al 0.1%, Cu 0.75%, Ce 0.1%, W 0.05%, Mo 0.015%, Nb 0.03%, and the balance is Fe and unavoidable impurities; (0.5W+5Mo) / 2Nb=5 / 3, and the reinforcement phase is composed of aluminum nitride particles and zirconium oxide fibers A with a mass ratio of 3:7; The preparation method thereof comprises the following steps: S1. After the materials are prepared according to the components of the matrix, smelting and refining are performed to obtain molten steel; S2. After adding the reinforcing phase into the molten steel and mixing evenly, continuous casting is performed, quenched at 850°C and kept warm for 3 hours, tempered at 500°C and kept warm for 6 hours, and a high-strength pipe-seam anchor is obtained.
[0023] Example 3 The only difference from Example 1 is: W 0.05%, Mo 0.015%, Nb 0.03%; (0.5W+5Mo) / 2Nb=5 / 3.
[0024] Example 4 The only difference from Example 1 is: W 0.04%, Mo 0.002%, Nb 0.05%; (0.5W+5Mo) / 2Nb=0.3.
[0025] Example 5 The only difference from Example 1 is: W 0.02%, Mo 0.01%, Nb 0.04%; (0.5W+5Mo) / 2Nb=0.75.
[0026] Example 6 The only difference from Example 5 is that the zirconia fiber A is replaced by an equal amount of zirconia fiber B.
[0027] Example 7 A high-strength pipe-seam anchor, comprising a matrix and a reinforcement phase in a mass ratio of 100:1, wherein the matrix is composed of the following elements by weight percentage: C 0.32%, Ni 1.2%, Cr 1.2%, S 0.001%, P 0.001%, Co 0.2%, Mn 0.2%, Al 0.05%, Cu 0.35%, Ce 0.05%, W 0.02%, Mo 0.001%, Nb 0.04%, and the balance is Fe and unavoidable impurities, and the reinforcement phase is composed of manganese oxide-coated aluminum nitride particles and zirconium oxide fibers B in a mass ratio of 7:3; The preparation method thereof comprises the following steps: S1, mixing 1 part of manganese oxide and 25 parts of aluminum nitride particles evenly, grinding, to obtain manganese oxide-coated aluminum nitride particles; S2, after the materials are mixed according to the components of the matrix, smelting and refining are performed to obtain molten steel; S3. After adding the reinforcing phase into the molten steel and mixing evenly, continuous casting is performed, quenched at 850°C and kept warm for 3 hours, tempered at 500°C and kept warm for 6 hours, and a high-strength pipe-seam anchor is obtained.
[0028] Example 8 The only difference from Example 7 is: 5 parts of manganese oxide and 25 parts of aluminum nitride particles.
[0029] Example 9 The only difference from Example 7 is: 3 parts of manganese oxide and 25 parts of aluminum nitride particles.
[0030] Example 10 A high-strength pipe-seam anchor, comprising a matrix and a reinforcement phase in a mass ratio of 100:1, wherein the matrix is composed of the following elements by weight percentage: C 0.32%, Ni 1.2%, Cr 1.2%, S 0.001%, P 0.001%, Co 0.2%, Mn 0.2%, Al 0.05%, Cu 0.35%, Ce 0.05%, W 0.02%, Mo 0.001%, Nb 0.04%, and the balance is Fe and unavoidable impurities, the reinforcement phase is composed of manganese oxide-aluminum nitride particles and zirconium oxide fiber B in a mass ratio of 7:3, and the manganese oxide-aluminum nitride particles are composed of manganese oxide and aluminum nitride particles in a mass ratio of 3:25; The preparation method thereof comprises the following steps: S1. After the materials are prepared according to the components of the matrix, smelting and refining are performed to obtain molten steel; S3. After adding the reinforcing phase into the molten steel and mixing evenly, continuous casting is performed, quenched at 850°C and kept warm for 3 hours, tempered at 500°C and kept warm for 6 hours, and a high-strength pipe-seam anchor is obtained.
[0031] Comparative Example 1 A high-strength pipe-seam anchor, comprising a matrix and a reinforcement phase, wherein the matrix is composed of the following elements by weight percentage: C 0.32%, Ni 1.2%, Cr 1.2%, S 0.001%, P 0.001%, Co 0.2%, Mn 0.2%, Al 0.05%, Cu 0.35%, Ce 0.05%, and the balance is Fe and unavoidable impurities; The preparation method thereof comprises the following steps: S1. After the materials are prepared according to the components of the matrix, smelting and refining are performed to obtain molten steel; S2. Add 0.7 parts of aluminum nitride particles and 0.3 parts of zirconium oxide fiber A to the molten steel, mix well, continuously cast, quench at 850°C and keep warm for 3 hours, temper at 500°C and keep warm for 6 hours, and obtain a high-strength pipe-seam anchor.
[0032] Test example The tensile strength and yield strength of the high-strength pipe seam anchors prepared in Examples 1 to 10 and Comparative Example 1 were tested with reference to the standard of GB / T 228.1-2021, and the results are shown in Table 1.
[0033] Table 1 Mechanical strength test results of Examples 1 to 10 and Comparative Example 1
[0034] Compared with Comparative Example 1, the high-strength tubular seam anchors prepared in Example 1 and Examples 3 to 5 contain W, Mo, and Nb elements. As a result, the tensile strength and yield strength of Example 1 and Examples 3 to 5 are greater than those of Comparative Example 1, indicating that the mechanical strength of the high-strength tubular seam anchor can be enhanced by adding W, Mo, and Nb elements to the tubular seam anchor.
[0035] Compared with Example 1 and Example 3, the contents of W, Mo, and Nb elements in the high-strength tubular seam anchor prepared in Examples 4~5 satisfy the relationship of 0.3≤(0.5W+5Mo) / 2Nb≤0.75. As a result, the tensile strength and yield strength of Examples 4~5 are greater than those of Example 1 and Example 3, indicating that by limiting 0.3≤(0.5W+5Mo) / 2Nb≤0.75, the mechanical strength of the high-strength tubular seam anchor is further enhanced.
[0036] Compared with Example 5, the diameter of the zirconia fiber in the high-strength tubular seam anchor prepared in Example 6 is 2~4μm, and the length is 20~300μm. As a result, the tensile strength and yield strength of Example 6 are greater than those of Example 5, indicating that the diameter of the zirconia fiber is 2~4μm, and the length is 20~300μm, which further enhances the mechanical strength of the high-strength tubular seam anchor.
[0037] Compared with Example 6 and Example 10, the aluminum nitride particles in the high-strength tubular seam anchor prepared in Examples 7 to 9 are aluminum nitride particles coated with manganese oxide. As a result, the tensile strength and yield strength of Examples 7 to 9 are greater than those of Example 6 and Example 10, indicating that the aluminum nitride particles are aluminum nitride particles coated with manganese oxide, which further enhances the mechanical strength of the high-strength tubular seam anchor.
[0038] Compared with Examples 7 and 8, the raw materials of the manganese oxide-coated aluminum nitride particles in the high-strength tubular seam anchor prepared in Example 9 include manganese oxide and aluminum nitride particles in a mass ratio of 3:25. As a result, the tensile strength and yield strength of Example 9 are greater than those of Examples 7 and 8, indicating that the raw materials of the manganese oxide-coated aluminum nitride particles include manganese oxide and aluminum nitride particles in a mass ratio of 3:25, which further enhances the mechanical strength of the high-strength tubular seam anchor.
[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A high-strength pipe seam anchor, comprising a matrix and a reinforcement phase, characterized in that: The matrix is composed of the following elements by weight percentage: C 0.32%-0.45%, Ni 1.2%-1.8%, Cr 1.2%-1.5%, S 0.001%-0.01%, P0.001%-0.01%, Co 0.2%-0.5%, Mn 0.2%-0.6%, Al 0.05%-0.1%, Cu 0.35%-0.75%, Ce 0.05%-0.1%, W 0.02%-0.05%, Mo 0.002%-0.015%, Nb 0.03%-0.06%, and the balance is Fe and inevitable impurities.
2. A high-strength pipe seam anchor according to claim 1, characterized in that: The mass percentages of W, Mo and Nb satisfy the following relationship: 0.3≤(0.5W+5Mo) / 2Nb≤0.
75.
3. A high-strength pipe seam anchor according to claim 1, characterized in that: The reinforcing phase includes oxide fibers and nitride particles in a mass ratio of 3:7 to 7:3, the oxide fibers include one or more of aluminum oxide fibers, zirconium oxide fibers, and magnesium oxide fibers, and the nitride particles are aluminum nitride particles.
4. A high-strength pipe seam anchor according to claim 3, characterized in that: The oxide fiber is zirconium oxide fiber.
5. A high-strength pipe seam anchor according to claim 4, characterized in that: The zirconia fiber has a diameter of 2-4 μm and a length of 20-300 μm.
6. A high-strength pipe seam anchor according to claim 3, characterized in that: The aluminum nitride particles are manganese oxide-coated aluminum nitride particles.
7. A high-strength pipe seam anchor according to claim 6, characterized in that: The raw materials of the manganese oxide-coated aluminum nitride particles include manganese oxide and aluminum nitride particles in a mass ratio of 1 to 5:
25.
8. A high-strength pipe seam anchor according to claim 7, characterized in that: The raw materials of the manganese oxide-coated aluminum nitride particles include manganese oxide and aluminum nitride particles in a mass ratio of 3:
25.
9. The high-strength pipe seam anchor according to claim 1, characterized in that: The mass ratio of the matrix to the reinforcement phase is 100:1-2.
10. A method for preparing a high-strength pipe seam anchor according to any one of claims 7 to 9, characterized in that: The following steps are involved: S1, mixing manganese oxide and aluminum nitride particles evenly, and grinding to obtain manganese oxide-coated aluminum nitride particles; S2, after the materials are mixed according to the components of the matrix, smelting and refining are performed to obtain molten steel; S3. Manganese oxide-coated aluminum nitride particles and oxide fibers are added to the molten steel and evenly dispersed, and then continuous casting and heat treatment are performed to obtain a high-strength pipe-seam anchor.