Corrosion-resistant hoop and preparation method thereof

Abstract

The invention relates to the field of cross arm hoops, and provides a corrosion-resistant hoop and a preparation method thereof. The corrosion-resistant hoop is prepared from the following components in percentage by weight: 0.35 percent to 0.45 percent of C, 0.4 percent to 0.6 percent of Si, 1.8 percent to 2.5 percent of Mn, 1.2 percent to 1.8 percent of Cr, 0.8 percent to 1.2 percent of Ni, 0.25 percent to 0.35 percent of Mo, 0.11 percent to 0.23 percent of composite rare earth, 0.15 percent to 0.25 percent of V, 0.03 percent to 0.07 percent of Nb, 0.003 percent to 0.008 percent of Al, 0.02 percent to 0.04 percent of B, 0.015 percent to 0.03 percent of N and the balance of Fe and other inevitable impurities. According to the corrosion-resistant hoop provided by the invention, the local corrosion resistance of the hoop in a complex environment is improved, the problems of mechanical property reduction and fracture risk are improved, and safe operation of an electric power circuit is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of crossarm clamps, and in particular to a corrosion-resistant clamp and a preparation method thereof. Background Art

[0002] As a crucial connecting and fixing component, clamps are widely used in numerous fields, including power, communications, and construction, to reinforce and support structures such as utility poles, communication towers, and pipelines. With the continuous advancement of infrastructure construction and increasingly complex environmental conditions, the performance requirements for clamps are becoming increasingly stringent, particularly in terms of corrosion resistance. Corrosion-resistant clamps can effectively resist environmental erosion, extend service life, reduce maintenance costs, and ensure the safe and stable operation of related facilities.

[0003] Corrosion-resistant clamps are products made from special materials or surface treatments to resist chemical and electrochemical corrosion, enabling them to maintain structural integrity and mechanical properties over time in a variety of harsh environmental conditions. Their primary function is to securely hold connected components together, withstanding various external forces and environmental factors, ensuring the stability and reliability of the connection. For example, in power systems, corrosion-resistant clamps are used to secure insulators, conductors, and other equipment on utility poles, preventing loosening and falling due to corrosion, thereby ensuring safe power transmission.

[0004] Corrosion-resistant metal materials such as stainless steel and aluminum alloy are expensive, significantly increasing the manufacturing cost of metal-based corrosion-resistant clamps. Although metal-based corrosion-resistant clamps offer some corrosion resistance, localized corrosion can occur during actual use due to material inhomogeneities, surface defects, or environmental factors. This localized corrosion can rapidly degrade the clamp's mechanical properties and even cause fracture, seriously threatening the safe operation of power lines. Therefore, the present invention provides a corrosion-resistant clamp and a method for its preparation. Summary of the Invention

[0005] The present invention provides a corrosion-resistant clamp and a preparation method thereof, which improves the clamp's ability to resist local corrosion in complex environments, improves the problems of mechanical property degradation and fracture risk, and ensures the safe operation of power lines.

[0006] The technical solutions of the present invention are as follows: In a first aspect, the present invention provides a corrosion-resistant clamp, which is composed of the following components, by weight percentage: C 0.35%-0.45%, Si 0.4%-0.6%, Mn 1.8%-2.5%, Cr 1.2%-1.8%, Ni 0.8%-1.2%, Mo 0.25%-0.35%, composite rare earth 0.11-0.23%, V 0.15%-0.25%, Nb 0.03%-0.07%, Al 0.003%-0.008%, B 0.02%-0.04%, N 0.015%-0.03%, and the balance is Fe and other inevitable impurities.

[0007] As a further technical solution, the corrosion-resistant clamp is composed of the following components in weight percentage: C 0.35%-0.45%, Si 0.4%-0.6%, Mn 1.8%-2.5%, Cr 1.2%-1.8%, Ni 0.8%-1.2%, Mo 0.25%-0.35%, La 0.05%-0.1%, Er 0.04%-0.08%, Yb 0.02%-0.05%, V 0.15%-0.25%, Nb 0.03%-0.07%, Al 0.003%-0.008%, B 0.02%-0.04%, N 0.015%-0.03%, and the balance is Fe and other inevitable impurities.

[0008] As a further technical solution, the corrosion-resistant clamp is composed of the following components by weight: C 0.35%-0.45%, Si 0.4%-0.6%, Mn 1.8%-2.5%, Cr 1.2%-1.8%, Ni 0.8%-1.2%, Mo 0.25%-0.35%, composite rare earth 0.11%-0.23%, V 0.15%-0.25%, Nb 0.03%-0.07%, Al 0.003%-0.008%, B 0.02%-0.04%, N 0.015%-0.03%, and the balance is Fe and other inevitable impurities; wherein, 0.6≤(B×N×1000) / (Cr+Mo)≤1.2.

[0009] As a further technical solution, the corrosion-resistant clamp is composed of the following components by weight: C 0.35%-0.45%, Si 0.4%-0.6%, Mn 1.8%-2.5%, Cr 1.2%-1.8%, Ni 0.8%-1.2%, Mo 0.25%-0.35%, composite rare earth 0.11%-0.23%, V 0.15%-0.25%, Nb 0.03%-0.07%, Al 0.003%-0.008%, B 0.02%-0.04%, N 0.015%-0.03%, and the balance is Fe and other inevitable impurities; wherein, 0.3≤V / (Nb+Yb)≤0.5.

[0010] In the second aspect, the present invention proposes a method for preparing a corrosion-resistant clamp, the steps comprising: preparing the materials according to the chemical composition to obtain a cable clamp material; then smelting, casting, two-stage solid solution treatment, dephosphorization, rolling and gradient tempering to obtain a clamp steel strip, and cutting and forming the clamp steel strip to obtain the corrosion-resistant clamp.

[0011] As a further technical solution, the smelting is carried out under argon protection, with the temperature controlled at 1550-1600°C and the vacuum degree ≤10 -3 Pa.

[0012] As a further technical solution, the casting temperature is 1480-1520°C, and two coolings are performed after casting, with the first cooling rate being 80-100°C / min to a surface temperature of 800°C, and the second slow cooling rate being ≤20°C / min to room temperature.

[0013] As a further technical solution, the two-stage solution treatment includes first maintaining at 1000-1100°C for 1-2 hours, water cooling to 600°C, and a cooling rate of ≥50°C / s; then maintaining at 870-890°C for 30-40 minutes, air cooling to 300°C, with a wind speed of 8-10m / s and a cooling rate of ≤10°C / s.

[0014] As a further technical solution, the dephosphorization is carried out by spraying high-pressure water at a temperature of 60-80°C and a pressure of 25-28 MPa for 20-30 minutes; the rolling temperature is 1000-1100°C, the rolling passes are 5-7, the deformation of a single pass is 25%-35%, and the rolling speed is 2.0-3.5 m / s.

[0015] As a further technical solution, the gradient tempering includes maintaining at 440-460°C for 100-120 minutes, cooling to 340-360°C and maintaining for 2.5-3.5 hours, then cooling to 240-260°C and maintaining for 3.5-4.5 hours, and finally cooling with the furnace.

[0016] The working principle and beneficial effects of the present invention are: This invention innovatively introduces a composite rare earth system composed of La (0.05-0.1%), Er (0.04-0.08%), and Yb (0.02-0.05%) in specific ratios. During the solidification process, these rare earth elements, with their unique atomic radii (La: 1.87 Å, Er: 1.75 Å, Yb: 1.73 Å), play a key role. They act as heterogeneous nucleation sites, inducing lattice distortion. This distortion promotes the formation of ultrafine grains. Furthermore, the rare earth elements' tendency to segregate at grain boundaries effectively inhibits the segregation of impurities such as sulfur and phosphorus at these boundaries, thereby increasing the density of the oxide film and enhancing the overall performance of the material.

[0017] In the field of material design, the present invention innovatively proposes a quantitative relationship of 0.6≤(B×N×1000) / (Cr + Mo)≤1.2. This relationship aims to achieve grain boundary strengthening through the synergistic effect of boron nitride (BN) and chromium-molybdenum carbide. When the B / N ratio is unbalanced, such as in Example 4, (B×N) / (Cr + Mo) = 0.15, the density of the BN precipitated phase at the grain boundary is significantly reduced, resulting in a significant increase in the rate of corrosive medium penetration along the grain boundary. Under the optimal ratio conditions, such as in Example 1, (B×N) / (Cr + Mo) = 0.82, the BN phase and carbide can form a composite strengthening layer, effectively reducing the intergranular corrosion current density and significantly improving the material's resistance to intergranular corrosion.

[0018] The present invention achieves the coordinated precipitation of MC carbides (V, Nb) and Laves phase (containing Yb) by precisely controlling the ratio of 0.3 ≤ V / (Nb + Yb) ≤ 0.5. This synergistic precipitation effect is crucial for improving material performance. When V / (Nb + Yb) is within a reasonable range, the size and spacing of the precipitates reach the optimal range consistent with the Orowan strengthening mechanism, effectively enhancing the material's mechanical properties. If this ratio is unbalanced, such as when V / (Nb + Yb) = 0.08 in Comparative Example 3, the insufficient density of the precipitates can significantly reduce the material's tensile strength.

[0019] The present invention adopts a two-stage solid solution process to achieve graded dissolution and re-precipitation of carbides. The first stage of high-temperature solid solution fully dissolves coarse carbides, and the second stage of low-temperature solid solution promotes uniform precipitation of fine carbides. The innovatively designed gradient tempering process eliminates different types of residual stresses in stages: the high-temperature stage eliminates macroscopic thermal stress, the medium-temperature stage releases microscopic dislocation stress, and the low-temperature stage stabilizes the precipitation phase structure.

[0020] This invention achieves simultaneous improvements in tensile strength (≥1500 MPa) and salt spray resistance (≥1900 h) through the coordinated design of components and processes. Example 1 exhibits a corrosion loss of only 0.28%, a 60% reduction compared to conventional processes. This is attributed to the synergistic effects of grain refinement, precipitation strengthening (V / Nb / Yb carbides), solid solution strengthening (Cr / Mo / N), and grain boundary strengthening (BN system). DETAILED DESCRIPTION

[0021] 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 embodiments described 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 making any creative efforts are within the scope of protection of the present invention.

[0022] In the present invention, the preparation method of the corrosion-resistant clamp comprises the following steps: preparing the cable clamp material according to the chemical composition; then controlling the temperature to 1550-1600°C and the vacuum degree to ≤10 under the protection of argon gas; -3 Pa for smelting; casting at a temperature of 1480-1520 ° C, cooling twice after casting, the first cooling rate is 80-100 ° C / min to the surface temperature of 800 ° C, the second slow cooling rate is ≤ 20 ° C / min to room temperature; first, keep at 1000-1100 ° C for 1-2 hours, water cool to 600 ° C, cooling rate ≥ 50 ° C / s; then keep at 870-890 ° C for 30-40 minutes, air cool to 300 ° C, wind speed 8-10m / s, cooling rate ≤ 10 ° C / s for double-stage solution treatment; adopt temperature 60-80 ° C, pressure The method comprises the following steps: spraying with high-pressure water at 25-28 MPa for 20-30 minutes to remove phosphorus; controlling the rolling temperature to 1000-1100°C, the rolling passes to 5-7 passes, the deformation of a single pass to 25%-35%, and the rolling speed to 2.0-3.5 m / s; and gradient tempering, i.e. maintaining the temperature at 440-460°C for 100-120 minutes, cooling the temperature to 340-360°C for 2.5-3.5 hours, then cooling the temperature to 240-260°C for 3.5-4.5 hours, and finally cooling the steel strip with the furnace to obtain the hoop steel strip, and cutting and forming the hoop steel strip to obtain the corrosion-resistant hoop.

[0023] The following is further described with more detailed embodiments.

[0024] Example 1 In this embodiment, a corrosion-resistant clamp is provided, which is composed of the following components, by weight percentage: C 0.40%, Si 0.5%, Mn 2.0%, Cr 1.5%, Ni 1.0%, Mo 0.3%, composite rare earth (La 0.06% + Er 0.05% + Yb 0.03%), V 0.2%, Nb 0.05%, Al 0.005%, B 0.03%, N 0.02%, and the balance is Fe and other inevitable impurities; Among them, (B×N×1000) / (Cr+Mo)=0.03×0.02×1000 / (1.5+0.3)=0.6; V / (Nb+Yb)=0.2 / (0.05+0.03)=0.33; The preparation method of the corrosion-resistant clamp comprises the following steps: preparing the cable clamp material according to the chemical composition; then controlling the temperature to 1575°C and the vacuum degree to 10 -3 Pa was used for smelting; casting was performed at a temperature of 1500°C, and cooling was performed twice after casting, with a first cooling rate of 90°C / min to a surface temperature of 800°C and a second slow cooling rate of 20°C / min to room temperature; first, it was kept at 1050°C for 1.5 hours, water-cooled to 600°C at a cooling rate of 50°C / s; then, it was kept at 880°C for 35 minutes, air-cooled to 300°C at a wind speed of 9m / s and a cooling rate of 10°C / s for a double-stage solution treatment step; High-pressure water spraying at a temperature of 70°C and a pressure of 26 MPa is used for 25 minutes to remove phosphorus; the rolling temperature is controlled to 1050°C, the rolling passes are 6, the deformation of a single pass is 30%, and the rolling speed is 2.7 m / s; gradient tempering is performed, that is, maintaining at 450°C for 110 minutes, cooling to 350°C and maintaining for 3 hours, then cooling to 250°C and maintaining for 4 hours, and finally cooling with the furnace to obtain a clamp steel strip, and the clamp steel strip is cut and formed to obtain the corrosion-resistant clamp.

[0025] Example 2 In this embodiment, a corrosion-resistant clamp is provided, which is composed of the following components, by weight percentage: C 0.42%, Si 0.6%, Mn 2.4%, Cr 1.2%, Ni 0.8%, Mo 0.35%, composite rare earth (La 0.1% + Er 0.08% + Yb 0.05%), V 0.25%, Nb 0.03%, Al 0.008%, B 0.04%, N 0.03%, and the balance is Fe and other inevitable impurities; Among them, (B×N×1000) / (Cr+Mo)=0.04×0.03×1000 / (1.2+0.35)=1.2; V / (Nb+Yb)=0.25 / (0.03+0.05)=0.36; The preparation method of the corrosion-resistant clamp comprises the following steps: preparing the cable clamp material according to the chemical composition; then controlling the temperature to 1550°C and the vacuum degree to 10 -3 The steel was melted at 1480°C and cast, and then cooled twice after casting, with a cooling rate of 80°C / min to a surface temperature of 800°C and a slow cooling rate of 20°C / min to room temperature; the steel was first kept at 1000°C for 1 hour, water-cooled to 600°C at a cooling rate of 50°C / s; then kept at 870°C for 30 minutes, air-cooled to 300°C at a wind speed of 8m / s and a cooling rate of 10°C / s for a two-stage solution treatment step; a temperature The steel strip is sprayed with high-pressure water at a temperature of 60°C and a pressure of 25 MPa for 20 minutes to remove phosphorus; the rolling temperature is controlled to be 1000°C, the rolling passes are 5, the deformation of a single pass is 25%, and the rolling speed is 2.0 m / s; gradient tempering is performed, i.e., the steel strip is kept at 440°C for 100 minutes, cooled to 340°C for 2.5 hours, and then cooled to 240°C for 3.5 hours. Finally, the steel strip is cooled in the furnace to obtain a hoop steel strip, and the corrosion-resistant hoop is obtained by cutting and forming the hoop steel strip.

[0026] Example 3 In this embodiment, a corrosion-resistant clamp is provided, which is composed of the following components, by weight percentage: C 0.38%, Si 0.55%, Mn 2.2%, Cr 1.6%, Ni 1.1%, Mo 0.28%, composite rare earth (La 0.08% + Er 0.06% + Yb 0.04%), V 0.18%, Nb 0.06%, Al 0.004%, B 0.025%, N 0.025%, and the balance is Fe and other inevitable impurities. Among them, (B×N×1000) / (Cr+Mo)=0.025×0.025×1000 / (1.6+0.28)=0.83; V / (Nb+Yb)=0.18 / (0.06+0.04)=0.18; The preparation method of the corrosion-resistant clamp comprises the following steps: preparing the cable clamp material according to the chemical composition; then controlling the temperature to 1600°C and the vacuum degree to 10 -3Pa was used for smelting; casting was performed at a temperature of 1520°C, and cooling was performed twice after casting, with a cooling rate of 100°C / min to a surface temperature of 800°C and a slow cooling rate of 20°C / min to room temperature; first, it was kept at 1100°C for 2h, water-cooled to 600°C at a cooling rate of 50°C / s; then, it was kept at 890°C for 40min, air-cooled to 300°C at a wind speed of 10m / s and a cooling rate of 10°C / s for a two-stage solution treatment step; High-pressure water spraying at a temperature of 80°C and a pressure of 28 MPa is used for 30 minutes to remove phosphorus; the rolling temperature is controlled to be 1100°C, the rolling passes are 7, the deformation of a single pass is 35%, and the rolling speed is 3.5 m / s; gradient tempering is performed, i.e., maintaining at 460°C for 120 minutes, cooling to 360°C and maintaining for 3.5 hours, then cooling to 260°C and maintaining for 4.5 hours, and finally cooling with the furnace to obtain a clamp steel strip, and the clamp steel strip is cut and formed to obtain the corrosion-resistant clamp.

[0027] Example 4 In this embodiment, a corrosion-resistant clamp is provided, which is composed of the following components, by weight percentage: C 0.45%, Si 0.4%, Mn 1.8%, Cr 1.8%, Ni 1.2%, Mo 0.25%, composite rare earth (La 0.08% + Er 0.06% + Yb 0.05%), V 0.25%, Nb 0.03%, Al 0.003%, B 0.02%, N 0.015%, and the balance is Fe and other inevitable impurities; Among them, (B×N×1000) / (Cr+Mo)=0.02×0.015×1000 / (1.8+0.25)=0.15; V / (Nb+Yb)=0.25 / (0.03+0.05)=0.5; The preparation method of the corrosion-resistant clamp comprises the following steps: preparing the cable clamp material according to the chemical composition; then controlling the temperature to 1550°C and the vacuum degree to 10 -3The steel was melted at 1520°C and cast, and then cooled twice after casting, with a cooling rate of 80°C / min to a surface temperature of 800°C and a slow cooling rate of 20°C / min to room temperature; the steel was first kept at 1000°C for 2h, water-cooled to 600°C at a cooling rate of 50°C / s; then kept at 870°C for 40min, air-cooled to 300°C at a wind speed of 8m / s and a cooling rate of 10°C / s for a two-stage solution treatment step; a temperature The steel strip is sprayed with high-pressure water at a temperature of 80°C and a pressure of 25 MPa for 30 minutes to remove phosphorus; the rolling temperature is controlled to be 1000°C, the rolling passes are 7, the deformation of each pass is 25%, and the rolling speed is 3.5 m / s; gradient tempering is performed, i.e., the steel strip is kept at 440°C for 120 minutes, cooled to 340°C for 3.5 hours, then cooled to 240°C for 4.5 hours, and finally cooled in the furnace to obtain a hoop steel strip, which is then cut and formed to obtain the corrosion-resistant hoop.

[0028] Example 5 This embodiment provides a corrosion-resistant clamp, which is composed of the following components, by weight percentage: C 0.35%, Si 0.4%, Mn 1.8%, Cr 1.2%, Ni 0.8%, Mo 0.35%, composite rare earth (La 0.05% + Er 0.04%), V 0.15%, Nb 0.07%, Al 0.003%, B 0.04%, N 0.03%, and the balance is Fe and other inevitable impurities; Among them, (B×N×1000) / (Cr+Mo)=0.04×0.03×1000 / (1.2+0.35)=1.2; V / (Nb+Yb)=0.15 / (0.07+0.03)=0.15; The preparation method of the corrosion-resistant clamp comprises the following steps: preparing the cable clamp material according to the chemical composition; then controlling the temperature to 1575°C and the vacuum degree to 10 -3Pa was used for smelting; casting was performed at a temperature of 1500°C, and cooling was performed twice after casting, with a first cooling rate of 90°C / min to a surface temperature of 800°C and a second slow cooling rate of 20°C / min to room temperature; first, it was kept at 1050°C for 1.5 hours, water-cooled to 600°C at a cooling rate of 50°C / s; then, it was kept at 880°C for 35 minutes, air-cooled to 300°C at a wind speed of 9m / s and a cooling rate of 10°C / s for a double-stage solution treatment step; High-pressure water spraying at a temperature of 70°C and a pressure of 26 MPa is used for 25 minutes to remove phosphorus; the rolling temperature is controlled to 1050°C, the rolling passes are 6, the deformation of a single pass is 30%, and the rolling speed is 2.7 m / s; gradient tempering is performed, that is, maintaining at 450°C for 110 minutes, cooling to 350°C and maintaining for 3 hours, then cooling to 250°C and maintaining for 4 hours, and finally cooling with the furnace to obtain a clamp steel strip, and the clamp steel strip is cut and formed to obtain the corrosion-resistant clamp.

[0029] Comparative Example 1 In Comparative Example 1, the composite rare earth La 0.02% + Er 0.03% + Yb 0.03% is the same as in Example 1, and the preparation steps are the same as in Example 1.

[0030] Comparative Example 2 In Comparative Example 2, the composite rare earth is replaced with 0.14% La, and the rest is the same as in Example 1, and the preparation steps are the same as in Example 1.

[0031] Comparative Example 3 In Comparative Example 3, the composite rare earth is replaced with 0.05% Yb, wherein V / (Nb+Yb)=0.1 / (0.07+0.05)=0.08; the rest is the same as in Example 1, and the preparation steps are the same as in Example 1.

[0032] Comparative Example 4 In Comparative Example 4, the composite rare earth content is 0.2% (La 0.1% + Er 0.06% + Yb 0.04%), B 0.05%, and N 0.04%, wherein (B×N×1000) / (Cr+Mo)=0.05×0.04×1000 / (1.5+0.3)=2.22. The rest is the same as in Example 1, and the preparation steps are the same as in Example 1.

[0033] Comparative Example 5 In Comparative Example 5, C content is 0.50%, and the rest is the same as in Example 1, and the preparation steps are the same as in Example 1.

[0034] Test Example 1: The corrosion-resistant clamps prepared in the above Examples 1-5 and Comparative Examples 1-5 were tested as follows: Tensile strength: Refer to GB / T 228.1-2021 "Tensile tests on metallic materials - Part 1: Room temperature test methods" to test the tensile strength of the clamp at room temperature; Salt spray resistance: Refer to ASTM B117 standard, use 5% mass concentration of NaCl solution to test the clamp, and record the time when slight corrosion appears (based on the standard of visible to the naked eye); Acid resistance: Soak the clamp in a 10% sulfuric acid aqueous solution for 30 days, and record the corrosion loss before and after immersion; Alkali resistance: Soak the clamp in a 10% sodium hydroxide aqueous solution for 30 days, and record the corrosion loss before and after immersion; The results are shown in Table 1 below: Table 1

[0035] Combined with the above, Example 1 exhibits the best overall performance, achieving a tensile strength of 1564 MPa, a salt spray resistance of 2050 h, and corrosion loss of less than 0.3%, validating the rationality of the composition and process design. In Example 4, due to a (B×N) / (Cr+Mo) ratio of 0.15, salt spray resistance significantly decreases to 1935 h, while corrosion loss increases to 0.35-0.39%. Example 5 achieves the highest tensile strength (1580 MPa), but salt spray resistance decreases slightly (1980 h), demonstrating that extreme compositions sacrifice some corrosion resistance in exchange for strength. In Comparative Example 1, the combined amount of La+Er+Yb is only 0.08% (below the lower limit of 0.11%), resulting in insufficient oxide film density, an 18% decrease in salt spray resistance, and a doubling of corrosion loss. Comparative Example 2 lacks the synergistic effect of Er / Yb, weakening its grain boundary purification ability and resulting in a 0.48% reduction in acid corrosion resistance. In Comparative Example 3, insufficient V content led to precipitation strengthening failure, resulting in a sharp drop in tensile strength to 1325 MPa and a salt spray resistance of only 1450 hours. In Comparative Example 4, (B×N) / (Cr+Mo)=2.22, severe corrosion due to grain boundary embrittlement resulted in the lowest tensile strength. In Comparative Example 5, high carbon content led to poor weldability and a 36% decrease in salt spray resistance. Despite a tensile strength of 1620 MPa, corrosion loss increased significantly.

[0036] In addition, in Example 1-2, (B×N×1000) / (Cr+Mo)=0.6-1.2 effectively balances grain boundary strengthening and corrosion resistance, and the corrosion loss is ≤0.32%; in Example 1-3, V / (Nb+Yb)=0.3-0.5 improves the tensile strength to above 1500 MPa.

[0037] 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 corrosion-resistant clamp, characterized in that: Calculated by weight, it is composed of the following components: C 0.35%-0.45%, Si 0.4%-0.6%, Mn 1.8%-2.5%, Cr 1.2%-1.8%, Ni 0.8%-1.2%, Mo 0.25%-0.35%, composite rare earth 0.11%-0.23%, V 0.15%-0.25%, Nb 0.03%-0.07%, Al 0.003%-0.008%, B 0.02%-0.04%, N0.015%-0.03%, and the balance is Fe and other inevitable impurities.

2. The corrosion-resistant clamp according to claim 1, characterized in that: The corrosion-resistant clamp is composed of the following components by weight: C 0.35%-0.45%, Si 0.4%-0.6%, Mn 1.8%-2.5%, Cr 1.2%-1.8%, Ni0.8%-1.2%, Mo 0.25%-0.35%, La 0.05%-0.1%, Er 0.04%-0.08%, Yb 0.02%-0.05%, V 0.15%-0.25%, Nb 0.03%-0.07%, Al 0.003%-0.008%, B 0.02%-0.04%, N 0.015%-0.03%, and the balance is Fe and other inevitable impurities.

3. The corrosion-resistant clamp according to claim 1, characterized in that: The corrosion-resistant clamp is composed of the following components by weight: C 0.35%-0.45%, Si 0.4%-0.6%, Mn 1.8%-2.5%, Cr 1.2%-1.8%, Ni 0.8%-1.2%, Mo 0.25%-0.35%, composite rare earth 0.11%-0.23%, V 0.15%-0.25%, Nb 0.03%-0.07%, Al 0.003%-0.008%, B 0.02%-0.04%, N 0.015%-0.03%, and the balance is Fe and other inevitable impurities; wherein, 0.6≤(B×N×1000) / (Cr+Mo)≤1.

2.

4. The corrosion-resistant clamp according to claim 1, characterized in that: The corrosion-resistant clamp is composed of the following components by weight: C 0.35%-0.45%, Si 0.4%-0.6%, Mn 1.8%-2.5%, Cr 1.2%-1.8%, Ni 0.8%-1.2%, Mo 0.25%-0.35%, composite rare earth 0.11%-0.23%, V 0.15%-0.25%, Nb 0.03%-0.07%, Al 0.003%-0.008%, B 0.02%-0.04%, N 0.015%-0.03%, and the balance is Fe and other inevitable impurities; wherein, 0.3≤V / (Nb+Yb)≤0.

5.

5. A method for preparing a corrosion-resistant clamp according to any one of claims 1 to 4, characterized in that the steps include: After preparing the chemical components, a cable clamp material is obtained; Subsequently, the hoop steel strip is obtained through smelting, casting, two-stage solid solution treatment, dephosphorization, rolling and gradient tempering. The corrosion-resistant hoop is obtained by cutting and forming the hoop steel strip.

6. The corrosion-resistant clamp according to claim 5, characterized in that: The smelting is carried out under argon protection, with the temperature controlled at 1550-1600°C and the vacuum degree ≤10 -3 Pa.

7. The corrosion-resistant clamp according to claim 5, characterized in that: The casting temperature is 1480-1520°C, and cooling is performed twice after casting, with the first cooling rate being 80-100°C / min to a surface temperature of 800°C, and the second slow cooling rate being ≤20°C / min to room temperature.

8. The corrosion-resistant clamp according to claim 5, characterized in that: The double-stage solution treatment includes first maintaining at 1000-1100°C for 1-2 hours, water cooling to 600°C, and a cooling rate of ≥50°C / s; then maintaining at 870-890°C for 30-40 minutes, and air cooling to 300°C, with a wind speed of 8-10m / s and a cooling rate of ≤10°C / s.

9. The corrosion-resistant clamp according to claim 5, characterized in that: The dephosphorization is performed by spraying high-pressure water at a temperature of 60-80°C and a pressure of 25-28 MPa for 20-30 minutes; the rolling temperature is 1000-1100°C, the rolling passes are 5-7, the deformation of a single pass is 25%-35%, and the rolling speed is 2.0-3.5 m / s.

10. The corrosion-resistant clamp according to claim 5, characterized in that: The gradient tempering includes maintaining the temperature at 440-460° C. for 100-120 minutes, cooling to 340-360° C. for 2.5-3.5 hours, then cooling to 240-260° C. for 3.5-4.5 hours, and finally cooling with the furnace.

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