High-strength corrosion-resistant pipe steel member and method for manufacturing the same

Abstract

This invention discloses a high-strength corrosion-resistant pipeline steel component and its preparation method, relating to the field of steel material technology. The high-strength corrosion-resistant pipeline steel component prepared by this invention comprises, from the inside out, a pipeline steel component base layer and an anti-corrosion layer. The high-strength corrosion-resistant pipeline steel component is prepared by first pre-treating the pipeline steel component base layer with a temperature rise, then applying tension to the pre-treated base layer using a tensioner, followed by coating the outer surface of the pre-treated base layer with an anti-corrosion material, and then continuing to heat and cool under a nitrogen-containing gas atmosphere. The pipeline steel component base layer, by mass fraction, comprises the following components: 0.09–0.11% C, 11–14% Cr, 0.4–1% Si, 0–0.03% S, 0–0.03% P, 0.03–0.08% Ti, with the remainder being Fe. The anti-corrosion material includes ammonium borate, polyacrylonitrile, aluminum oxalate, and ammonium polyvanadate. The high-strength corrosion-resistant pipeline steel component prepared by this invention exhibits high strength and good corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of steel materials technology, specifically to a high-strength corrosion-resistant pipe steel component and its preparation method. Background Technology

[0002] Steel components refer to composite steel structural components that can bear and transmit loads, made of steel plates, angle steel, channel steel, I-beams, welded or hot-rolled H-beams that are cold-bent or welded together with connectors.

[0003] Steel structural components offer a range of advantages, including light weight, factory manufacturing, rapid installation, short construction period, good seismic performance, quick return on investment, and less environmental pollution. Compared to reinforced concrete structures, they possess unique advantages in terms of height, size, and lightness, and are commonly used for pipeline transportation. However, in daily use, pipeline steel components have relatively low strength and are highly susceptible to corrosion from external environments such as sunlight and rain. Therefore, to ensure the service life of pipeline steel components, they must possess excellent corrosion resistance and strength.

[0004] This invention addresses this problem by developing a high-strength, corrosion-resistant pipe steel component. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a high-strength corrosion-resistant pipeline steel component, which includes, from the inside out, a pipeline steel component base layer and a corrosion-resistant layer. The high-strength corrosion-resistant pipeline steel component is obtained by first pre-treating the pipeline steel component base layer by heating, then applying tension to the pre-treated pipeline steel component base layer using a tensioner, and subsequently coating the outer surface of the pre-treated pipeline steel component base layer with a layer of anti-corrosion material, followed by further heating and cooling in a nitrogen-containing gas atmosphere.

[0006] Furthermore, the base layer of the pipeline steel component comprises the following components by mass fraction: 0.09-0.11% C, 11-14% Cr, 0.4-1% Si, 0-0.03% S, 0-0.03% P, 0.03-0.08% Ti, with the remainder being Fe.

[0007] Furthermore, the anti-corrosion material comprises the following components by mass: 30-50 parts ammonium borate, 100-200 parts polyacrylonitrile, 40-60 parts aluminum oxalate, and 4-8 parts ammonium polyvanadate.

[0008] Furthermore, the nitrogen-containing gas includes at least one of nitrogen and ammonia.

[0009] Furthermore, a method for preparing a high-strength corrosion-resistant pipe steel component includes the following preparation steps:

[0010] (1) Place the base layer of the pipe steel component in a heat treatment furnace, evacuate to 10-20 Pa, then heat to 760-860 °C at a rate of 95-105 °C / h, and then increase the temperature by 2-3 m 3 Nitrogen gas is introduced at a rate of 30-60 min, and the temperature is maintained for 4-6 h to obtain the pretreated pipeline steel component base layer;

[0011] (2) Apply tension to the pretreated pipe steel component base layer obtained in step (1) using a tensioner, and then apply anti-corrosion material to the surface of the pretreated pipe steel component base layer to obtain an anti-corrosion pipe steel component.

[0012] (3) Under nitrogen protection, the anti-corrosion pipeline steel component obtained in step (2) is placed in a heating furnace and heated to 1300-1500℃, and simultaneously pressurized to 0.1-0.3MPa. The temperature is held for 2-4 hours. The temperature inside the furnace is cooled to 560-600℃ at a rate of 15-25℃ / h by air cooling and held for 1-3 hours. The temperature is then further cooled to 380-400℃ at a rate of 75-85℃ / h by air cooling and held for 1-3 hours. After that, the temperature is naturally cooled to room temperature and removed from the furnace to obtain a high-strength anti-corrosion pipeline steel component.

[0013] Furthermore, the vacuum level of the vacuuming in step (1) is 1 mba.

[0014] Furthermore, the tension applied by the tensioner in step (2) is 1 to 3 kg / mm.

[0015] Furthermore, the thickness of the anti-corrosion material coating in step (2) is 0.3 to 0.5 mm.

[0016] Furthermore, the preparation method of the anti-corrosion material in step (2) is as follows: First, add 100-200 parts by weight of polyacrylonitrile to a mixer for melt mixing. After observing that the polyacrylonitrile is fully mixed and melted, add 30-50 parts by weight of ammonium borate, 40-60 parts by weight of aluminum oxalate, and 4-8 parts by weight of ammonium polyvanadate. Continue mixing for 5-10 minutes, melt and set aside to obtain the anti-corrosion material.

[0017] Furthermore, the mixing temperature is 130–140°C.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] The high-strength corrosion-resistant pipeline steel component prepared by this invention includes, from the inside out, a pipeline steel component base layer and an anti-corrosion layer. First, the pipeline steel component base layer is pretreated by heating to obtain a pretreated pipeline steel component base layer. Then, tension is applied to the pretreated pipeline steel component base layer using a tensioner. Subsequently, an anti-corrosion material is coated on the outer surface of the pretreated pipeline steel component base layer, and heating continues to obtain the high-strength corrosion-resistant pipeline steel component. The composition and mass fraction of the pipeline steel component base layer include 0.09–0.11% C, 11–14% Cr, 0.4–1% Si, 0–0.03% S, 0–0.03% P, 0.03–0.08% Ti, with the remainder being Fe. The anti-corrosion material includes ammonium borate, polyacrylonitrile, aluminum oxalate, and ammonium polyvanadate.

[0020] First, under nitrogen protection, the temperature is raised to 760–800℃ and held to allow cementite to fully and uniformly dissolve in austenite, forming a single and uniform austenitic structure. Then, tension is applied using a tensioner to create uniform cracks and crystal defects in the base layer of the pipeline steel component. The anti-corrosion material diffuses uniformly into the base layer of the pipeline steel component through these cracks and crystal defects. Simultaneously, the aluminum oxalate in the anti-corrosion material decomposes upon heating, forming alumina and a large amount of carbon dioxide, which escapes, creating numerous pores. Nitrogen-containing gas enters the base layer of the pipeline steel component and the anti-corrosion material through these pores. The reaction with titanium and iron in the base layer of the pipeline steel component, along with the carbonization and decomposition of polyacrylonitrile, ammonium borate, and ammonium polyvanadate in the anti-corrosion material, forms a large amount of VN and titanium nitride in the base layer of the pipeline steel component. This promotes ferrite nucleation and pins the grains in the base layer of the pipeline steel component, thereby achieving the effect of grain refinement and enhancing the strength of the high-strength anti-corrosion pipeline steel component. The decomposition of ammonium borate in the anti-corrosion material forms a dense composite layer of boron nitride and aluminum nitride on the surface of the base layer of the pipeline steel component, enhancing the corrosion resistance of the high-strength anti-corrosion pipeline steel component. Detailed Implementation

[0021] 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.

[0022] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The testing methods for various indicators of the high-strength corrosion-resistant pipe steel components obtained in the following embodiments are as follows:

[0023] Strength: High-strength corrosion-resistant pipe steel components prepared with the same mass as the examples and comparative examples were tested for tensile strength according to GB / T228.

[0024] Corrosion resistance: High-strength corrosion-resistant pipe steel components prepared in the same mass examples and comparative examples were immersed in sodium hydroxide solution with pH 12 and nitric acid solution with pH 2 for 30 days each, and then removed to test the corrosion depth of the high-strength corrosion-resistant pipe steel components.

[0025] Example 1

[0026] A method for preparing a high-strength corrosion-resistant pipe steel component includes the following preparation steps:

[0027] (1) Place the base layer of the pipe steel component in a heat treatment furnace, evacuate to a vacuum degree of 1 mba, then raise the temperature to 760℃ at a rate of 95℃ / h, and then raise the temperature at a rate of 2 m 3 Nitrogen gas is introduced at a rate of 30 min for 30 min, and the temperature is maintained for 4 h to obtain the pretreated pipeline steel component base layer;

[0028] (2) Use a tensioner to apply tension to the pretreated pipe steel component base layer obtained in step (1) at 1 kg / mm, and then coat the surface of the pretreated pipe steel component base layer with a thickness of 0.3 mm of anti-corrosion material to obtain an anti-corrosion pipe steel component.

[0029] (3) Under nitrogen protection, the anti-corrosion pipeline steel component obtained in step (2) is placed in a heating furnace and heated to 1300 r / min, and simultaneously pressurized to 0.1 MPa. The temperature is held for 2 hours, and the temperature inside the furnace is cooled to 560°C at a rate of 15°C / h by air cooling. The temperature is held for 1 hour, and then cooled to 380°C at a rate of 75°C / h by air cooling. The temperature is held for 1 hour, and then cooled naturally to room temperature and removed from the furnace to obtain a high-strength anti-corrosion pipeline steel component.

[0030] The preparation method of the anti-corrosion material in step (2) is as follows: First, add 100 parts by mass of polyacrylonitrile to a mixer for melting and mixing. After observing that the polyacrylonitrile is fully mixed and melted, add 30 parts by mass of ammonium borate, 40 parts by mass of aluminum oxalate, and 4 parts by mass of ammonium polyvanadate. Continue mixing for 5 minutes, melt and set aside to obtain the anti-corrosion material.

[0031] The base layer of the pipeline steel component in step (1) comprises the following components by mass fraction: 0.09% C, 11% Cr, 0.4% Si, 0.01% S, 0.01% P, 0.03% Ti, and the remainder is Fe.

[0032] Example 2

[0033] A method for preparing a high-strength corrosion-resistant pipe steel component includes the following preparation steps:

[0034] (1) Place the base layer of the pipe steel component in a heat treatment furnace, evacuate to a vacuum degree of 1 mba, then raise the temperature to 800℃ at a rate of 100℃ / h, and then reduce the temperature at a rate of 2.5m...3 Nitrogen gas is introduced at a rate of 1 / min for 45 min, and the temperature is maintained for 5 h to obtain the pretreated pipeline steel component base layer;

[0035] (2) Use a tensioner to apply tension to the pretreated pipe steel component base layer obtained in step (1) at 2 kg / mm, and then coat the surface of the pretreated pipe steel component base layer with a thickness of 0.4 mm of anti-corrosion material to obtain an anti-corrosion pipe steel component.

[0036] (3) Under nitrogen protection, the anti-corrosion pipeline steel component obtained in step (2) is placed in a heating furnace and heated to 1400 r / min, and simultaneously pressurized to 0.2 MPa. The temperature is held for 3 hours, and the temperature inside the furnace is cooled to 580°C at a rate of 20°C / h by air cooling. The temperature is held for 2 hours, and then cooled to 390°C at a rate of 80°C / h by air cooling. The temperature is held for 2 hours, and then cooled naturally to room temperature and removed from the furnace to obtain a high-strength anti-corrosion pipeline steel component.

[0037] The preparation method of the anti-corrosion material in step (2) is as follows: First, add 150 parts by mass of polyacrylonitrile to a mixer for melting and mixing. After observing that the polyacrylonitrile is fully mixed and melted, add 40 parts by mass of ammonium borate, 50 parts by mass of aluminum oxalate, and 6 parts by mass of ammonium polyvanadate. Continue mixing for 7 minutes, melt and set aside to obtain the anti-corrosion material.

[0038] The base layer of the pipeline steel component in step (1) comprises the following components by mass fraction: 0.1% C, 13% Cr, 0.7% Si, 0.02% S, 0.02% P, 0.05% Ti, and the remainder is Fe.

[0039] Example 3

[0040] A method for preparing a high-strength corrosion-resistant pipe steel component includes the following preparation steps:

[0041] (1) Place the base layer of the pipe steel component in a heat treatment furnace, evacuate to a vacuum degree of 1 mba, then raise the temperature to 860℃ at a rate of 105℃ / h, and then raise the temperature at a rate of 3 m 3 Nitrogen gas is introduced at a rate of 60 min for 60 min, and the temperature is maintained for 6 h to obtain the pretreated pipeline steel component base layer;

[0042] (2) Use a tensioner to apply tension to the pretreated pipe steel component base layer obtained in step (1) at 3 kg / mm, and then coat the surface of the pretreated pipe steel component base layer with a thickness of 0.5 mm of anti-corrosion material to obtain an anti-corrosion pipe steel component.

[0043] (3) Under nitrogen protection, the anti-corrosion pipeline steel component obtained in step (2) is placed in a heating furnace and heated to 1500 r / min, and simultaneously pressurized to 0.3 MPa. The temperature is held for 4 hours, and the temperature inside the furnace is cooled to 600°C at a rate of 25°C / h by air cooling. The temperature is held for 3 hours, and then cooled to 400°C at a rate of 85°C / h by air cooling. The temperature is held for 3 hours, and then cooled naturally to room temperature and removed from the furnace to obtain a high-strength anti-corrosion pipeline steel component.

[0044] The preparation method of the anti-corrosion material in step (2) is as follows: First, add 200 parts by mass of polyacrylonitrile to a mixer for melting and mixing. After observing that the polyacrylonitrile is fully mixed and melted, add 50 parts by mass of ammonium borate, 60 parts by mass of aluminum oxalate, and 8 parts by mass of ammonium polyvanadate. Continue mixing for 10 minutes, melt and set aside to obtain the anti-corrosion material.

[0045] The base layer of the pipeline steel component in step (1) comprises the following components by mass fraction: 0.11% C, 14% Cr, 0.4-1% Si, 0.03% S, 0.03% P, 0.08% Ti, and the remainder is Fe.

[0046] Comparative Example 1

[0047] A method for preparing a high-strength corrosion-resistant pipe steel component includes the following preparation steps:

[0048] (1) Place the base layer of the pipe steel component in a heat treatment furnace, evacuate to a vacuum degree of 1 mba, then raise the temperature to 800℃ at a rate of 100℃ / h, and then reduce the temperature at a rate of 2.5m... 3 Nitrogen gas is introduced at a rate of 1 / min for 45 min, and the temperature is maintained for 5 h to obtain the pretreated pipeline steel component base layer;

[0049] (2) Apply a 0.4 mm thick anti-corrosion material to the base surface of the pre-treated pipeline steel component to obtain an anti-corrosion pipeline steel component;

[0050] (3) Under nitrogen protection, the anti-corrosion pipeline steel component obtained in step (2) is placed in a heating furnace and heated to 1400 r / min, and simultaneously pressurized to 0.2 MPa. The temperature is held for 3 hours, and the temperature inside the furnace is cooled to 580°C at a rate of 20°C / h by air cooling. The temperature is held for 2 hours, and then cooled to 390°C at a rate of 80°C / h by air cooling. The temperature is held for 2 hours, and then cooled naturally to room temperature and removed from the furnace to obtain a high-strength anti-corrosion pipeline steel component.

[0051] The preparation method of the anti-corrosion material in step (2) is as follows: First, add 150 parts by mass of polyacrylonitrile to a mixer for melting and mixing. After observing that the polyacrylonitrile is fully mixed and melted, add 40 parts by mass of ammonium borate, 50 parts by mass of aluminum oxalate, and 6 parts by mass of ammonium polyvanadate. Continue mixing for 7 minutes, melt and set aside to obtain the anti-corrosion material.

[0052] The base layer of the pipeline steel component in step (1) comprises the following components by mass fraction: 0.1% C, 13% Cr, 0.7% Si, 0.02% S, 0.02% P, 0.05% Ti, and the remainder is Fe.

[0053] Comparative Example 2

[0054] A method for preparing a high-strength corrosion-resistant pipe steel component includes the following preparation steps:

[0055] (1) Place the base layer of the pipe steel component in a heat treatment furnace, evacuate to a vacuum degree of 1 mba, then raise the temperature to 800℃ at a rate of 100℃ / h, and then reduce the temperature at a rate of 2.5m... 3 Nitrogen gas is introduced at a rate of 1 / min for 45 min, and the temperature is maintained for 5 h to obtain the pretreated pipeline steel component base layer;

[0056] (2) Use a tensioner to apply tension to the pretreated pipe steel component base layer obtained in step (1) at 2 kg / mm, and then coat the surface of the pretreated pipe steel component base layer with a thickness of 0.4 mm of anti-corrosion material to obtain an anti-corrosion pipe steel component.

[0057] (3) Under nitrogen protection, the anti-corrosion pipeline steel component obtained in step (2) is placed in a heating furnace and heated to 1400 r / min, and simultaneously pressurized to 0.2 MPa. The temperature is held for 3 hours, and the temperature inside the furnace is cooled to 580°C at a rate of 20°C / h by air cooling. The temperature is held for 2 hours, and then cooled to 390°C at a rate of 80°C / h by air cooling. The temperature is held for 2 hours, and then cooled naturally to room temperature and removed from the furnace to obtain a high-strength anti-corrosion pipeline steel component.

[0058] The preparation method of the anti-corrosion material in step (2) is as follows: First, add 150 parts by mass of polyacrylonitrile to a mixer for melting and mixing. After observing that the polyacrylonitrile is fully mixed and melted, add 40 parts by mass of ammonium borate, 50 parts by mass of aluminum oxalate, and 6 parts by mass of ammonium polyvanadate. Continue mixing for 7 minutes, melt and set aside to obtain the anti-corrosion material.

[0059] The base layer of the pipeline steel component in step (1) comprises the following components by mass fraction: 0.2% C, 11% Cr, 0.5% Si, 0.02% S, 0.02% P, and the remainder is Fe.

[0060] Comparative Example 3

[0061] A method for preparing a high-strength corrosion-resistant pipe steel component includes the following preparation steps:

[0062] (1) Place the base layer of the pipe steel component in a heat treatment furnace, evacuate to a vacuum degree of 1 mba, then raise the temperature to 800℃ at a rate of 100℃ / h, and then reduce the temperature at a rate of 2.5m... 3 Nitrogen gas is introduced at a rate of 1 / min for 45 min, and the temperature is maintained for 5 h to obtain the pretreated pipeline steel component base layer;

[0063] (2) Use a tensioner to apply tension to the pretreated pipe steel component base layer obtained in step (1) at 2 kg / mm, and then coat the surface of the pretreated pipe steel component base layer with a thickness of 0.4 mm of anti-corrosion material to obtain an anti-corrosion pipe steel component.

[0064] (3) Under nitrogen protection, the anti-corrosion pipeline steel component obtained in step (2) is placed in a heating furnace and heated to 1400 r / min, and simultaneously pressurized to 0.2 MPa. The temperature is held for 3 hours, and the temperature inside the furnace is cooled to 580°C at a rate of 20°C / h by air cooling. The temperature is held for 2 hours, and then cooled to 390°C at a rate of 80°C / h by air cooling. The temperature is held for 2 hours, and then cooled naturally to room temperature and removed from the furnace to obtain a high-strength anti-corrosion pipeline steel component.

[0065] The preparation method of the anti-corrosion material in step (2) is as follows: First, add 150 parts by mass of polyacrylonitrile to a mixer for melting and mixing. After observing that the polyacrylonitrile is fully mixed and melted, add 50 parts by mass of aluminum oxalate and 6 parts by mass of ammonium polyvanadate. Continue mixing for 7 minutes, melt and set aside to obtain the anti-corrosion material.

[0066] The base layer of the pipeline steel component in step (1) comprises the following components by mass fraction: 0.1% C, 13% Cr, 0.7% Si, 0.02% S, 0.02% P, 0.05% Ti, and the remainder is Fe.

[0067] Comparative Example 4

[0068] A method for preparing a high-strength corrosion-resistant pipe steel component includes the following preparation steps:

[0069] (1) Place the base layer of the pipe steel component in a heat treatment furnace, evacuate to a vacuum degree of 1 mba, then raise the temperature to 800℃ at a rate of 100℃ / h, and then reduce the temperature at a rate of 2.5m... 3 Nitrogen gas is introduced at a rate of 1 / min for 45 min, and the temperature is maintained for 5 h to obtain the pretreated pipeline steel component base layer;

[0070] (2) Use a tensioner to apply tension to the pretreated pipe steel component base layer obtained in step (1) at 2 kg / mm, and then coat the surface of the pretreated pipe steel component base layer with a thickness of 0.4 mm of anti-corrosion material to obtain an anti-corrosion pipe steel component.

[0071] (3) Under nitrogen protection, the anti-corrosion pipeline steel component obtained in step (2) is placed in a heating furnace and heated to 1400 r / min, and simultaneously pressurized to 0.2 MPa. The temperature is held for 3 hours, and the temperature inside the furnace is cooled to 580°C at a rate of 20°C / h by air cooling. The temperature is held for 2 hours, and then cooled to 390°C at a rate of 80°C / h by air cooling. The temperature is held for 2 hours, and then cooled naturally to room temperature and removed from the furnace to obtain a high-strength anti-corrosion pipeline steel component.

[0072] The preparation method of the anti-corrosion material in step (2) is as follows: First, add 150 parts by mass of polyacrylonitrile to a mixer for melting and mixing. After observing that the polyacrylonitrile is fully mixed and melted, add 40 parts by mass of ammonium borate and 6 parts by mass of ammonium polyvanadate. Continue mixing for 7 minutes, melt and set aside to obtain the anti-corrosion material.

[0073] The base layer of the pipeline steel component in step (1) comprises the following components by mass fraction: 0.1% C, 13% Cr, 0.7% Si, 0.02% S, 0.02% P, 0.05% Ti, and the remainder is Fe.

[0074] Comparative Example 5

[0075] A method for preparing a high-strength corrosion-resistant pipe steel component includes the following preparation steps:

[0076] (1) Place the base layer of the pipe steel component in a heat treatment furnace, evacuate to a vacuum degree of 1 mba, then raise the temperature to 800℃ at a rate of 100℃ / h, and then reduce the temperature at a rate of 2.5m... 3 Nitrogen gas is introduced at a rate of 1 / min for 45 min, and the temperature is maintained for 5 h to obtain the pretreated pipeline steel component base layer;

[0077] (2) Use a tensioner to apply tension to the pretreated pipe steel component base layer obtained in step (1) at 2 kg / mm, and then coat the surface of the pretreated pipe steel component base layer with a thickness of 0.4 mm of anti-corrosion material to obtain an anti-corrosion pipe steel component.

[0078] (3) Under nitrogen protection, the anti-corrosion pipeline steel component obtained in step (2) is placed in a heating furnace and heated to 1400 r / min, and simultaneously pressurized to 0.2 MPa. The temperature is held for 3 hours, and the temperature inside the furnace is cooled to 580°C at a rate of 20°C / h by air cooling. The temperature is held for 2 hours, and then cooled to 390°C at a rate of 80°C / h by air cooling. The temperature is held for 2 hours, and then cooled naturally to room temperature and removed from the furnace to obtain a high-strength anti-corrosion pipeline steel component.

[0079] The preparation method of the anti-corrosion material in step (2) is as follows: First, add 150 parts by mass of polyacrylonitrile to a mixer for melting and mixing. After observing that the polyacrylonitrile is fully mixed and melted, add 40 parts by mass of ammonium borate and 50 parts by mass of aluminum oxalate, continue mixing for 7 minutes, melt and set aside to obtain the anti-corrosion material.

[0080] The base layer of the pipeline steel component in step (1) comprises the following components by mass fraction: 0.1% C, 13% Cr, 0.7% Si, 0.02% S, 0.02% P, 0.05% Ti, and the remainder is Fe.

[0081] Example of effect

[0082] Table 1 below presents the analysis results of the strength and corrosion resistance of the high-strength corrosion-resistant pipe steel components prepared using Examples 1 to 3 and Comparative Examples 1 to 5 of the present invention.

[0083] Table 1

[0084]

[0085]

[0086] Table 1 shows that the high-strength corrosion-resistant pipe steel components prepared in Examples 1, 2, and 3 have high strength and good corrosion resistance. A comparison of the experimental data from Examples 1, 2, and 3 and Comparative Example 1 reveals that applying tension to the pre-treated pipe steel component base layer using a tensioner, followed by coating the outer surface of the pre-treated base layer with an anti-corrosion material, results in high-strength corrosion-resistant pipe steel components. The experimental data from Examples 1, 2, and 3 and Comparative Example 2 show that the components used and their mass fractions include 0.09–0.11% C, 11–14% Cr, 0.4–1% Si, 0–0.03% S, 0–0.03% P, 0.03–0.08% Ti, and the remainder... High-strength corrosion-resistant pipe steel components were prepared using Fe as the base layer for pipe steel components, resulting in high-strength corrosion-resistant pipe steel components with high strength. Experimental data from Examples 1, 2, 3, and Comparative Example 3 showed that using ammonium borate to prepare high-strength corrosion-resistant pipe steel components resulted in high strength and good corrosion resistance. Experimental data from Examples 1, 2, 3, and Comparative Example 4 showed that using aluminum oxalate to prepare high-strength corrosion-resistant pipe steel components resulted in high strength and good corrosion resistance. Experimental data from Examples 1, 2, 3, and Comparative Example 5 showed that using ammonium polyvanadate to prepare high-strength corrosion-resistant pipe steel components resulted in high strength.

[0087] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for preparing high-strength corrosion-resistant pipe steel components, characterized in that, The preparation steps include the following: (1) Place the base layer of the pipe steel component in a heat treatment furnace, evacuate to 10~20Pa, then raise the temperature to 760~860℃ at a rate of 95~105℃ / h, and then at a rate of 2~3m 3 Nitrogen gas is introduced at a rate of 30-60 min, and the temperature is maintained for 4-6 h to obtain the pretreated pipeline steel component base layer; (2) Apply tension to the pretreated pipe steel component base layer obtained in step (1) using a tensioner, and then coat the surface of the pretreated pipe steel component base layer with anti-corrosion material to obtain an anti-corrosion pipe steel component. (3) Under nitrogen protection, the anti-corrosion pipeline steel component obtained in step (2) is placed in a heating furnace and heated to 1300~1500℃, and simultaneously pressurized to 0.1~0.3MPa. The temperature is held for 2~4h, and the temperature inside the furnace is cooled to 560~600℃ at a rate of 15~25℃ / h by air cooling. The temperature is held for 1~3h, and then cooled to 380~400℃ at a rate of 75~85℃ / h by air cooling. The temperature is held for 1~3h, and then cooled naturally to room temperature and removed from the furnace to obtain a high-strength anti-corrosion pipeline steel component. The preparation method of the anti-corrosion material in step (2) is as follows: First, add 100-200 parts by weight of polyacrylonitrile to a mixer for melting and mixing. After observing that the polyacrylonitrile is fully mixed and melted, add 30-50 parts by weight of ammonium borate, 40-60 parts by weight of aluminum oxalate, and 4-8 parts by weight of ammonium polyvanadate. Continue mixing for 5-10 minutes, melt and set aside to obtain the anti-corrosion material. The base layer of the pipeline steel component comprises the following components by mass fraction: 0.09~0.11%C, 11~14%Cr, 0.4~1%Si, 0~0.03%S, 0~0.03%P, 0.03~0.08%Ti, with the remainder being Fe.

2. The method for preparing high-strength corrosion-resistant pipeline steel components according to claim 1, characterized in that, The tension applied by the tensioner in step (2) is 1~3 kg / mm.

3. The method for preparing high-strength corrosion-resistant pipeline steel components according to claim 1, characterized in that, The thickness of the anti-corrosion material coating in step (2) is 0.3~0.5mm.

4. The method for preparing high-strength corrosion-resistant pipeline steel components according to claim 1, characterized in that, The mixing temperature is 130~140℃.

5. A high-strength, corrosion-resistant steel pipe component, characterized in that, The high-strength corrosion-resistant pipeline steel component is prepared by the method for preparing high-strength corrosion-resistant pipeline steel components according to any one of claims 1 to 4.

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