A high-strength clamp and its preparation method

Abstract

This invention relates to the field of clamp technology, and proposes a high-strength clamp and its preparation method. The high-strength clamp is obtained by treating the clamp body with a phosphating solution. The clamp body is composed of the following components by weight percentage: C 0.3%~0.4%, Mn 1.5%~2.5%, Mo 0.06%~0.9%, V 0.6%~1.2%, Cu 0.2%~0.3%, Sn 0.04%~0.13%, Co 0.4%~1.2%, Al 0.05%~0.12%, Nb 0.005%~0.015%, Ce 0.01%~0.018%, Y 0.01%~0.015%, Hf 0.02%~0.12%, with the remainder being iron and other unavoidable impurities. This technical solution solves the problem of poor tensile strength in clamps in related technologies.

Description

Technical Field

[0001] This invention relates to the field of clamp technology, specifically to a high-strength clamp and its preparation method. Background Technology

[0002] Metal clamps are used to fasten, connect, or secure objects, and are widely used in various fields, including construction, power, communications, and transportation. In construction, clamps are commonly used to secure pipes, cable trays, and wire ducts, ensuring their stable fixation to supporting structures. In the power industry, clamps are used to secure accessories for equipment such as utility poles and transformers, as well as to connect and secure cables. In communications, clamps are commonly used to secure fiber optic cables and communication lines. Clamps need to withstand significant clamping forces and external loads; however, under repeated loading and unloading, their tensile strength decreases with increasing usage time, eventually leading to breakage. Furthermore, current clamps have poor corrosion resistance; prolonged exposure to corrosive environments easily causes rust and corrosion, indirectly reducing their strength and service life. Therefore, improving the tensile strength of clamps is a pressing technical problem that needs to be solved. Summary of the Invention

[0003] This invention proposes a high-strength clamp and its preparation method, which solves the problem of poor tensile strength of clamps in related technologies.

[0004] The technical solution of the present invention is as follows:

[0005] This invention proposes a high-strength clamp, obtained by treating the clamp body with a phosphating solution. The clamp body is composed of the following components by weight percentage:

[0006] C 0.3%~0.4%, Mn 1.5%~2.5%, Mo 0.06%~0.9%, V 0.6%~1.2%, Cu 0.2%~0.3%, Sn 0.04%~0.13%, Co 0.4%~1.2%, Al 0.05%~0.12%, Nb 0.005%~0.015%, Ce 0.01%~0.018%, Y 0.01%~0.015%, Hf 0.02%~0.12%, with the remainder being iron and unavoidable impurities.

[0007] As a further technical solution, the weight ratio of Sn and Hf to the weight of Mo is 1:2~4.

[0008] When the weight ratio of Sn and Hf to Mo is 1:2~4, the tensile strength of the clamp can be further improved.

[0009] As a further technical solution, the Sn and Hf have equal weights.

[0010] When the weight ratio of Sn and Hf to Mo is 1:2~4 and the weights of Sn and Hf are equal, the tensile strength of the clamp can be further improved.

[0011] This invention also proposes a method for preparing a high-strength clamp, comprising the following steps:

[0012] S1. The components are prepared according to the stated weight percentage, melted, and cast to obtain a hoop blank;

[0013] S2. After descaling, rolling and machining the clamp blank, a semi-finished clamp is obtained;

[0014] S3. The semi-finished clamp is heat-treated to obtain the clamp body;

[0015] S4. The clamp body is pickled and washed with water, and then phosphated with phosphate solution to obtain the clamp.

[0016] As a further technical solution, the phosphating solution comprises the following components in parts by weight:

[0017] 20-35 parts phosphoric acid, 10-15 parts nitrate, 10-15 parts potassium dihydrogen phosphate, 5.5-13 parts polyethyleneimine, 1-14 parts ferric ammonium ethylenediaminetetraacetate, 2-5 parts sodium nitrite, and 80 parts water.

[0018] Phosphating the clamp body with phosphating solution can effectively prevent corrosive substances from directly contacting the clamp metal substrate. The addition of polyethyleneimine and ferric ammonium ethylenediaminetetraacetate helps to form a better film on the clamp surface, improves the clamp's corrosion resistance, and thus effectively prevents the clamp's tensile strength from decreasing due to corrosion.

[0019] As a further technical solution, the weight ratio of the polyethyleneimine and the ferric ammonium ethylenediaminetetraacetate is 1~5:1.

[0020] When the weight ratio of polyethyleneimine to ferric ammonium ethylenediaminetetraacetate is 1~5:1, the corrosion resistance of the clamp can be further improved, and the tensile strength of the clamp can be effectively prevented from decreasing due to corrosion.

[0021] As a further technical solution, the nitrate is one or more of potassium nitrate, manganese nitrate, and calcium nitrate.

[0022] As a further technical solution, in step S2, during the descaling process, high-pressure water spraying is used, with a pressure of 15~17MPa and a spraying time of 35~45min.

[0023] As a further technical solution, in step S3, the heat treatment is divided into a first heat treatment and a second heat treatment. In the first heat treatment, the temperature is 800~900℃ and the holding time is 40~60min; in the second heat treatment, the temperature is 600~650℃ and the holding time is 100~120min.

[0024] As a further technical solution, in step S4, the temperature of the phosphating solution is 75~85℃ and the phosphating time is 15~20min.

[0025] As a further technical solution, in step S4, a hydrochloric acid solution with a mass fraction of 6% to 12% is used for pickling.

[0026] The working principle and beneficial effects of the present invention are:

[0027] In this invention, the content of various components in the clamp is comprehensively considered, and a stable overall structure is formed through the effective interaction between the components, which helps to improve the tensile strength of the clamp. In particular, by adding Sn, Hf and Mo and optimizing the content of the three, their synergistic effect can be fully utilized, thereby significantly improving the tensile strength of the clamp. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] In the following examples and comparative examples, the content of Mn in the iron-manganese alloy is 75 wt%; the content of V in the ferrovanadium alloy is 50 wt%; the content of Cu in the copper-iron alloy is 90 wt%; the content of Mo in the molybdenum-iron alloy is 70 wt%; the content of Sn in the tin-iron alloy is 60 wt%; the content of Co in the iron-cobalt alloy is 40 wt%; the content of Nb in the niobium-iron alloy is 65 wt%; the content of Ce in the iron-cerium alloy is 20 wt%; the content of Y in the yttrium-iron alloy is 60 wt%; the content of Hf in the aluminum-hafnium alloy is 10 wt%; the content of Fe in the scrap steel is 97.3 wt%; and the polyethyleneimine is of type G-1500.

[0030] Example 1

[0031] A high-strength clamp is obtained by treating the clamp body with a phosphating solution. The clamp body is composed of the following components by weight percentage:

[0032] The composition is as follows: C 0.3%, Mn 1.5%, Mo 0.06%, V 0.6%, Cu 0.2%, Sn 0.04%, Co 0.4%, Al 0.05%, Nb 0.005%, Ce 0.01%, Y 0.01%, Hf 0.02%, with the remainder being iron and unavoidable impurities.

[0033] The phosphating solution comprises the following components in parts by weight:

[0034] 20 parts phosphoric acid, 10 parts potassium nitrate, 10 parts potassium dihydrogen phosphate, 5.5 parts polyethyleneimine, 1 part ferric ammonium ethylenediaminetetraacetate, 2 parts sodium nitrite, 80 parts water;

[0035] A method for preparing a high-strength clamp includes the following steps:

[0036] S1. Iron-manganese alloy, ferrovanadium alloy, copper-iron alloy, ferromolybdenum alloy, ferrotin alloy, iron-cobalt alloy, ferroniobium alloy, iron-cerium alloy, yttrium-iron alloy, aluminum-hafnium alloy, and scrap steel are mixed according to the above weight percentages, smelted, and cast to form a hoop blank.

[0037] S2. The clamp blank is sprayed with high-pressure water at a pressure of 15MPa for 45 minutes to remove scale. After rolling and machining, a semi-finished clamp is obtained.

[0038] S3. The semi-finished clamp is subjected to a first heat treatment at 800℃ for 60 minutes; and a second heat treatment at 600℃ for 120 minutes to obtain the clamp body.

[0039] S4. After acid washing and water washing of the clamp body with 8% hydrochloric acid solution, it is phosphated in phosphating solution at 75℃ for 20 minutes to obtain the clamp.

[0040] Example 2

[0041] A high-strength clamp is obtained by treating the clamp body with a phosphating solution. The clamp body is composed of the following components by weight percentage:

[0042] The composition is as follows: C 0.35%, Mn 2.0%, Mo 0.36%, V 1%, Cu 0.25%, Sn 0.13%, Co 0.8%, Al 0.1%, Nb 0.01%, Ce 0.014%, Y 0.012%, Hf 0.11%, with the remainder being iron and unavoidable impurities.

[0043] The phosphating solution comprises the following components in parts by weight:

[0044] 30 parts phosphoric acid, 12 parts potassium nitrate, 13 parts potassium dihydrogen phosphate, 5.8 parts polyethyleneimine, 6.2 parts ferric ammonium ethylenediaminetetraacetate, 3 parts sodium nitrite, 80 parts water;

[0045] A method for preparing a high-strength clamp includes the following steps:

[0046] S1. Iron-manganese alloy, ferrovanadium alloy, copper-iron alloy, ferromolybdenum alloy, ferrotin alloy, iron-cobalt alloy, ferroniobium alloy, iron-cerium alloy, yttrium-iron alloy, aluminum-hafnium alloy, and scrap steel are mixed according to the above weight percentages, smelted, and cast to form a hoop blank.

[0047] S2. The clamp blank is sprayed with high-pressure water at a pressure of 16MPa for 40 minutes to remove scale. After rolling and machining, a semi-finished clamp is obtained.

[0048] S3. The semi-finished clamp is subjected to a first heat treatment at a temperature of 850℃ and held for 50 minutes; a second heat treatment is subjected to a temperature of 630℃ and held for 110 minutes to obtain the clamp body.

[0049] S4. After acid washing and water washing of the clamp body with 8% hydrochloric acid solution, it is phosphated in phosphating solution at 80℃ for 18 minutes to obtain the clamp.

[0050] Example 3

[0051] A high-strength clamp is obtained by treating the clamp body with a phosphating solution. The clamp body is composed of the following components by weight percentage:

[0052] The composition is as follows: C 0.4%, Mn 2.5%, Mo 0.9%, V 1.2%, Cu 0.3%, Sn 0.13%, Co 1.2%, Al 0.12%, Nb 0.015%, Ce 0.018%, Y 0.015%, Hf 0.12%, with the remainder being iron and unavoidable impurities.

[0053] The phosphating solution comprises the following components in parts by weight:

[0054] 35 parts phosphoric acid, 15 parts potassium nitrate, 15 parts potassium dihydrogen phosphate, 13 parts polyethyleneimine, 14 parts ferric ammonium ethylenediaminetetraacetate, 5 parts sodium nitrite, 80 parts water;

[0055] A method for preparing a high-strength clamp includes the following steps:

[0056] S1. Iron-manganese alloy, ferrovanadium alloy, copper-iron alloy, ferromolybdenum alloy, ferrotin alloy, iron-cobalt alloy, ferroniobium alloy, iron-cerium alloy, yttrium-iron alloy, aluminum-hafnium alloy, and scrap steel are mixed according to the above weight percentages, smelted, and cast to form a hoop blank.

[0057] S2. The clamp blank is sprayed with high-pressure water at a pressure of 17MPa for 35 minutes to remove scale. After rolling and machining, a semi-finished clamp is obtained.

[0058] S3. The semi-finished clamp is subjected to a first heat treatment at a temperature of 900℃ and held for 40 minutes; a second heat treatment is subjected to a temperature of 650℃ and held for 100 minutes to obtain the clamp body.

[0059] S4. After acid washing and water washing of the clamp body with 8% hydrochloric acid solution, it is phosphated in phosphating solution at 85℃ for 15 minutes to obtain the clamp.

[0060] Example 4

[0061] The only difference between this embodiment and Embodiment 2 is that in this embodiment, the weight percentage of Mo added is 0.52%, the weight percentage of Sn added is 0.05%, and the weight percentage of Hf added is 0.03%.

[0062] Example 5

[0063] The only difference between this embodiment and Embodiment 2 is that in this embodiment, the weight percentage of Mo added is 0.4%, the weight percentage of Sn added is 0.11%, and the weight percentage of Hf added is 0.09%.

[0064] Example 6

[0065] The only difference between this embodiment and Embodiment 2 is that in this embodiment, the weight percentage of Mo added is 0.48%, the weight percentage of Sn added is 0.07%, and the weight percentage of Hf added is 0.05%.

[0066] Example 7

[0067] The only difference between this embodiment and embodiment 6 is that in this embodiment, the weight percentage of Mo added is 0.48%, the weight percentage of Sn added is 0.05%, and the weight percentage of Hf added is 0.07%.

[0068] Example 8

[0069] The only difference between this embodiment and embodiment 6 is that in this embodiment, the weight percentage of Mo added is 0.48%, the weight percentage of Sn added is 0.06%, and the weight percentage of Hf added is 0.06%.

[0070] Example 9

[0071] The only difference between this embodiment and Embodiment 8 is that in this embodiment, 11 parts of polyethyleneimine and 1 part of ferric ammonium ethylenediaminetetraacetate are added to the phosphating solution.

[0072] Example 10

[0073] The only difference between this embodiment and Embodiment 8 is that in this embodiment, 6 parts of polyethyleneimine and 6 parts of ferric ammonium ethylenediaminetetraacetate are added to the phosphating solution.

[0074] Example 11

[0075] The only difference between this embodiment and Embodiment 8 is that in this embodiment, 10 parts of polyethyleneimine and 2 parts of ferric ammonium ethylenediaminetetraacetate are added to the phosphating solution.

[0076] Example 12

[0077] The only difference between this embodiment and Example 8 is that in this embodiment, 12 parts of polyethyleneimine were added to the phosphating solution, but ferric ammonium ethylenediaminetetraacetate was not added.

[0078] Example 13

[0079] The only difference between this embodiment and Example 8 is that in this embodiment, 12 parts of ferric ammonium ethylenediaminetetraacetate were added to the phosphating solution, but no polyethyleneimine was added.

[0080] Example 14

[0081] The only difference between this embodiment and Example 8 is that, in this embodiment, ferric ammonium ethylenediaminetetraacetate and polyethyleneimine were not added to the phosphating solution.

[0082] Comparative Example 1

[0083] The only difference between this comparative example and Example 1 is that Hf was not added in this comparative example, and the weight percentage of Sn added was 0.06%.

[0084] Comparative Example 2

[0085] The only difference between this comparative example and Example 1 is that Sn was not added in this comparative example, and the weight percentage of Hf added was 0.06%.

[0086] Comparative Example 3

[0087] The only difference between this comparative example and Example 1 is that Sn and Hf were not added in this comparative example, and the weight percentage of Mo added was 0.12%.

[0088] Comparative Example 4

[0089] The only difference between this comparative example and Example 1 is that Mo was not added in this comparative example, the weight percentage of Sn added was 0.08%, and the weight percentage of Hf added was 0.04%.

[0090] Comparative Example 5

[0091] The only difference between this comparative example and Example 1 is that Sn, Hf, and Mo were not added in this comparative example.

[0092] Experimental Example 1: Tensile Strength Test

[0093] The tensile strength of the clamps prepared in Examples 1-8 and Comparative Examples 1-5 was tested according to the method in GB / T 228-2002 "Metallic Materials - Tensile Testing at Room Temperature"; the test results are shown in Table 1 below.

[0094] Table 1. Tensile strength test results of Examples 1-8 and Comparative Examples 1-5

[0095]

[0096] In Table 1, compared with Comparative Examples 1 to 5, the tensile strength of Example 1 is significantly improved, indicating that Sn, Hf and Mo have a synergistic effect and can significantly improve the tensile strength of the clamp.

[0097] Compared with Examples 2 and 4, the tensile strength of Examples 5 and 6 is improved, indicating that the tensile strength of the clamp can be further improved when the weight ratio of Sn and Hf to Mo is 1:2 to 4.

[0098] Compared with Examples 6-7, the tensile strength of Example 8 is improved, indicating that when the weight ratio of Sn and Hf to Mo is 1:2-4 and the weights of Sn and Hf are equal, the tensile strength of the clamp can be further improved.

[0099] Experiment Example 2 Corrosion Resistance Test

[0100] The clamps prepared in Examples 1-3 and 8-14 were immersed in a 20% hydrochloric acid solution for 24 hours. The mass loss of the clamp samples was measured, and the mass loss rate was calculated according to the following formula: Mass loss rate (%) = (mass of clamp before immersion - mass of clamp after immersion) / mass of clamp before immersion × 100%. The test results are shown in Table 2 below.

[0101] Table 2. Corrosion resistance test results of Examples 1-3 and Examples 8-14

[0102]

[0103] Table 2 shows that the clamps prepared in Examples 1-3, after being immersed in a 20% hydrochloric acid solution for 24 hours, exhibited a mass loss rate ≤0.015%, indicating that the clamps prepared in this scheme have good corrosion resistance and can mitigate the impact of corrosion on tensile strength. Compared to Examples 8-9, the clamps prepared in Examples 10-11, after being immersed in a 20% hydrochloric acid solution for 24 hours, showed a lower mass loss rate, indicating that a weight ratio of polyethyleneimine to ferric ammonium ethylenediaminetetraacetate (EDTA) of 1-5:1 can further improve the corrosion resistance of the clamps, thereby further mitigating the impact of corrosion on tensile strength. Compared to Examples 12-14, the clamps prepared in Example 8, after being immersed in a 20% hydrochloric acid solution for 24 hours, showed a lower mass loss rate, indicating that the addition of polyethyleneimine and ferric ammonium EDTA to the phosphating solution helps improve the corrosion resistance of the clamps, thereby effectively preventing a decrease in tensile strength due to corrosion.

[0104] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-strength clamp, obtained by treating the clamp body with a phosphating solution, characterized in that, The clamp body is composed of the following components by weight percentage: C 0.3%~0.4%, Mn 1.5%~2.5%, Mo 0.06%~0.9%, V 0.6%~1.2%, Cu 0.2%~0.3%, Sn 0.04%~0.13%, Co 0.4%~1.2%, Al 0.05%~0.12%, Nb 0.005%~0.015%, Ce 0.01%~0.018%, Y 0.01%~0.015%, Hf 0.02%~0.12%, with the remainder being iron and other unavoidable impurities; The weight ratio of Sn and Hf to the weight of Mo is 1:2~4; The phosphating solution comprises the following components in parts by weight: 20-35 parts phosphoric acid, 10-15 parts nitrate, 10-15 parts potassium dihydrogen phosphate, 5.5-13 parts polyethyleneimine, 1-14 parts ferric ammonium ethylenediaminetetraacetate, 2-5 parts sodium nitrite, and 80 parts water.

2. The high-strength clamp according to claim 1, characterized in that, The Sn and Hf have equal weights.

3. A method for preparing a high-strength clamp according to any one of claims 1 to 2, characterized in that, Includes the following steps: S1. The components are prepared according to the stated weight percentage, melted, and cast to obtain a hoop blank; S2. After descaling, rolling and machining the clamp blank, a semi-finished clamp is obtained; S3. The semi-finished clamp is heat-treated to obtain the clamp body; S4. The clamp body is pickled and washed with water, and then phosphated with phosphate solution to obtain the clamp.

4. The method for preparing a high-strength clamp according to claim 3, characterized in that, The weight ratio of the polyethyleneimine to the ferric ammonium ethylenediaminetetraacetate is 1 to 5:

1.

5. The method for preparing a high-strength clamp according to claim 3, characterized in that, The nitrate is one or more of potassium nitrate, manganese nitrate, and calcium nitrate.

6. The method for preparing a high-strength clamp according to claim 3, characterized in that, In step S2, during descaling, high-pressure water spraying is used with a pressure of 15-17 MPa and a spraying time of 35-45 minutes.

7. The method for preparing a high-strength clamp according to claim 3, characterized in that, In step S3, the heat treatment is divided into a first heat treatment and a second heat treatment. In the first heat treatment, the temperature is 800~900℃ and the holding time is 40~60min. In the second heat treatment, the temperature is 600~650℃ and the holding time is 100~120min.

8. The method for preparing a high-strength clamp according to claim 3, characterized in that, In step S4, during the phosphating treatment, the temperature of the phosphating solution is 75~85℃, and the phosphating time is 15~20min.

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