Steel for high-strength anti-seismic bracket as well as preparation method and application of steel

Abstract

The invention relates to the technical field of metal processing, and provides high-strength anti-seismic support steel and a preparation method and application thereof.The high-strength anti-seismic support steel comprises a steel matrix and a reinforcing phase, and the steel matrix is prepared from, by weight, 0.35%-0.5% of C, 0.01%-0.03% of Si, 0.4%-0.7% of Mn, 0.001%-0.005% of S, 0.001%-0.004% of N, 0.02%-0.05% of Al, 0.001%-0.02% of Cu, 0.2%-0.5% of V, 0.01%-0.05% of Ti, 0.2%-0.8% of Cr, 0.3%-0.7% of Mo, 0.01%-0.1% of Nb, 0.005%-0.15% of Bi, 0.001%-0.01% of Dy and the balance Fe and inevitable impurities; the reinforcing phase is nitrogen-containing compound crystal whiskers. According to the technical scheme, the problem of low strength of an anti-seismic support in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal processing, and in particular to a high-strength steel for earthquake-resistant brackets and a preparation method and application thereof. Background Art

[0002] Earthquake is a natural disaster with great destructive power, which can cause serious damage to buildings in an instant. When an earthquake occurs, the structure of the building will be subjected to strong vibration and impact. If there are no effective earthquake-resistant measures, the building will easily collapse, causing huge losses to people's lives and property. In order to improve the earthquake resistance of buildings in earthquakes, earthquake-resistant supports came into being. Earthquake-resistant supports are devices used to support the structure of buildings. They can effectively reduce the vibration and displacement of buildings when an earthquake occurs, thereby protecting the structural safety of the building. With the continuous development of modern building structures, the height and complexity of building structures are constantly increasing, and the strength requirements for earthquake-resistant supports are becoming higher and higher to withstand greater earthquake forces. Therefore, it is of great significance to develop a high-strength earthquake-resistant support to protect people's lives and property. Summary of the invention

[0003] The present invention provides a high-strength steel for earthquake-resistant brackets and a preparation method and application thereof, which solve the problem of low strength of earthquake-resistant brackets in related technologies.

[0004] The technical solution of the present invention is as follows: The present invention provides a high-strength steel for earthquake-resistant brackets, comprising a steel matrix and a reinforcement phase, wherein the steel matrix is ​​composed of the following components by weight percentage: C 0.35%-0.5%, Si 0.01%-0.03%, Mn 0.4%-0.7%, S 0.001%-0.005%, N 0.001%-0.004%, Al 0.02%-0.05%, Cu 0.001%-0.02%, V 0.2%-0.5%, Ti 0.01%-0.05%, Cr 0.2%-0.8%, Mo 0.3%-0.7%, Nb 0.01%-0.1%, Bi 0.005%-0.15%, Dy 0.001%-0.01%, and the balance is Fe and unavoidable impurities; The reinforcement phase is nitrogen-containing compound whiskers.

[0005] As a further technical solution, the weight ratio of Nb to Bi is 2:3.

[0006] In the present invention, the weight ratio of Nb to Bi is limited to 2:3, thereby further improving the strength of the steel for the earthquake-resistant support.

[0007] As a further technical solution, the weight ratio of the sum of the weights of Nb and Bi to Dy is 10-20:1.

[0008] In the present invention, the weight of Nb and Bi and the weight ratio of Nb and Bi to Dy are limited to 10-20:1, thereby further improving the strength of the steel for the seismic support.

[0009] As a further technical solution, the nitrogen-containing compound whiskers include boron nitride whiskers and silicon nitride whiskers.

[0010] As a further technical solution, the mass ratio of the boron nitride whiskers to the silicon nitride whiskers is 3-6:1.

[0011] The present invention also provides a method for preparing high-strength seismic support steel, comprising the following steps: S1, after mixing the materials according to the components, smelting and refining to obtain molten steel; S2, adding a reinforcing phase to the molten steel, and obtaining a steel billet after die casting; S3. The steel billet is subjected to heat treatment to obtain steel for earthquake-resistant support.

[0012] As a further technical solution, the added amount of the reinforcing phase is 2‰~6‰ of the mass of the molten steel.

[0013] As a further technical solution, the heat treatment includes quenching and tempering.

[0014] As a further technical solution, the quenching temperature is 850-950°C, and the quenching time is 2-5 hours; the tempering temperature is 450-550°C, and the tempering time is 5-8 hours.

[0015] The present invention also proposes the application of high-strength steel for earthquake-resistant support or a preparation method of high-strength steel for earthquake-resistant support in earthquake-resistant support.

[0016] The working principle and beneficial effects of the present invention are: In the present invention, the steel for seismic support includes a steel matrix and a reinforcement phase, wherein the weight ratio of each component in the steel matrix is ​​optimized so that the components in the steel matrix cooperate with each other, which helps to improve the performance of the steel for seismic support. At the same time, Nb, Bi, and Dy are added, and the weight ratio of the three is optimized so that Nb, Bi, and Dy work together. A reinforcement phase composed of nitrogen-containing compound whiskers is added to enhance the strength of the steel for seismic support. DETAILED DESCRIPTION

[0017] 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.

[0018] In the following embodiments and comparative examples: Ferrochromium alloy, chromium content 60wt%; ferrosilicon alloy, silicon content 75wt%; ferrotitanium alloy, titanium content 80wt%; ferrovanadium alloy, vanadium content 50wt%; ferromolybdenum alloy, molybdenum content 70wt%; ferroniobium alloy, niobium content 65wt%; bismuth ingot, bismuth content 99.99wt%; ferrodysprosium alloy, dysprosium content 80wt%; boron nitride whiskers, diameter 5μm, length 30μm; silicon nitride whiskers, diameter 0.2~1.0μm, length 5~10μm.

[0019] Example 1 High-strength seismic support steel, composed of the following components, measured by weight percentage: C 0.4%, Si 0.02%, Mn 0.5%, S 0.003%, N 0.002%, Al 0.04%, Cu 0.01%, V 0.4%, Ti 0.03%, Cr 0.5%, Mo 0.5%, Nb 0.1%, Bi 0.1%, Dy 0.004%, the balance being Fe and unavoidable impurities; The preparation process comprises the following steps: S1. Mix carbon powder, manganese powder, aluminum powder, copper block, ferrochrome alloy, ferrosilicon alloy, ferrotitanium alloy, ferrovanadium alloy, ferromolybdenum alloy, ferroniobium alloy, bismuth ingot, ferrodysprosium alloy and iron block according to the ingredients, and obtain molten steel after smelting and refining; S2, adding silicon nitride whiskers (the amount added is 2‰ of the mass of the molten steel) to the molten steel, and obtaining a steel billet after die casting; S3. Quench the steel billet at 900°C for 3 hours, and temper it at 500°C for 7 hours to obtain steel for earthquake-resistant brackets.

[0020] Example 2 High-strength seismic support steel, composed of the following components, measured by weight percentage: C 0.35%, Si 0.01%, Mn 0.4%, S 0.001%, N 0.001%, Al 0.02%, Cu 0.001%, V 0.2%, Ti 0.01%, Cr 0.2%, Mo 0.3%, Nb 0.01%, Bi 0.005%, Dy 0.01%, the balance being Fe and unavoidable impurities; The preparation process comprises the following steps: S1. Mix carbon powder, manganese powder, aluminum powder, copper block, ferrochrome alloy, ferrosilicon alloy, ferrotitanium alloy, ferrovanadium alloy, ferromolybdenum alloy, ferroniobium alloy, bismuth ingot, ferrodysprosium alloy and iron block according to the ingredients, and obtain molten steel after smelting and refining; S2, adding silicon nitride whiskers (the amount added is 4‰ of the mass of the molten steel) to the molten steel, and obtaining a steel billet after die casting; S3. Quench the steel billet at 850°C for 5 hours, and temper it at 450°C for 8 hours to obtain steel for earthquake-resistant brackets.

[0021] Example 3 High-strength seismic support steel, composed of the following components, measured by weight percentage: C 0.5%, Si 0.03%, Mn 0.7%, S 0.005%, N 0.004%, Al 0.05%, Cu 0.02%, V 0.5%, Ti 0.05%, Cr 0.8%, Mo 0.7%, Nb 0.05%, Bi 0.15%, Dy 0.001%, and the balance is Fe and unavoidable impurities; The preparation process comprises the following steps: S1. Mix carbon powder, manganese powder, aluminum powder, copper block, ferrochrome alloy, ferrosilicon alloy, ferrotitanium alloy, ferrovanadium alloy, ferromolybdenum alloy, ferroniobium alloy, bismuth ingot, ferrodysprosium alloy and iron block according to the ingredients, and obtain molten steel after smelting and refining; S2, adding silicon nitride whiskers (the addition amount is 6‰ of the mass of the molten steel) to the molten steel, and obtaining a steel billet after die casting; S3. Quench the steel billet at 950°C for 2 hours, and temper it at 550°C for 5 hours to obtain steel for earthquake-resistant brackets.

[0022] Example 4 The only difference between this embodiment and embodiment 2 is that the addition amount of Nb is 0.02%, the addition amount of Bi is 0.03%, and the addition amount of Dy is 0.01%.

[0023] Example 5 The only difference between this embodiment and embodiment 2 is that the addition amount of Nb is 0.1%, the addition amount of Bi is 0.15%, and the addition amount of Dy is 0.01%.

[0024] Example 6 The only difference between this embodiment and embodiment 4 is that the addition amount of Nb is 0.02%, the addition amount of Bi is 0.03%, and the addition amount of Dy is 0.005%.

[0025] Example 7 The only difference between this embodiment and embodiment 4 is that the addition amount of Nb is 0.02%, the addition amount of Bi is 0.03%, and the addition amount of Dy is 0.0025%.

[0026] Example 8 The only difference between this embodiment and embodiment 7 is that the silicon nitride whiskers are replaced with an equal amount of boron nitride whiskers.

[0027] Example 9 The only difference between this embodiment and embodiment 7 is that the reinforcement phase is composed of boron nitride whiskers and silicon nitride whiskers in a mass ratio of 3:1.

[0028] Example 10 The only difference between this embodiment and embodiment 7 is that the reinforcement phase is composed of boron nitride whiskers and silicon nitride whiskers in a mass ratio of 6:1.

[0029] Comparative Example 1 The only difference between this comparative example and Example 1 is that no Nb is added and the addition amount of Bi is 0.2%.

[0030] Comparative Example 2 The only difference between this comparative example and Example 1 is that Bi is not added and the addition amount of Nb is 0.2%.

[0031] Comparative Example 3 The only difference between this comparative example and Example 1 is that Nb and Bi are not added, and the added amount of Dy is 0.204%.

[0032] Comparative Example 4 The only difference between this comparative example and Example 1 is that Dy is not added, the addition amount of Nb is 0.102%, and the addition amount of Bi is 0.102%.

[0033] Comparative Example 5 The only difference between this comparative example and Example 1 is that Dy, Nb and Bi are not added.

[0034] The tensile strength of the steel for seismic supports prepared in Examples 1 to 10 and Comparative Examples 1 to 5 was tested according to the test method in GB / T 228.1-2021 "Tensile test of metallic materials Part 1: Room temperature test method", and the test results are shown in Table 1.

[0035] Table 1 Test results of steel performance for earthquake-resistant supports

[0036] Compared with Example 1, Comparative Example 1 did not add Nb, Comparative Example 2 did not add Bi, Comparative Example 3 did not add Nb and Bi, Comparative Example 4 did not add Dy, and Comparative Example 5 did not add Nb, Bi and Dy. As a result, the tensile strength of the seismic support steels prepared in Comparative Examples 1 to 5 was lower than that in Example 1, indicating that the tensile strength of the seismic support steels can be improved by adding Nb, Bi, and Dy at the same time.

[0037] Compared with Example 2, the weight ratio of Nb and Bi was changed in Examples 4~5. As a result, the tensile strength of the seismic support steel prepared in Examples 4~5 was higher than that in Example 2, indicating that when the weight ratio of Nb and Bi is 2:3, the tensile strength of the seismic support steel can be further improved.

[0038] Compared with Example 4, the weight ratio of Dy was changed in Examples 6~7. As a result, the tensile strength of the seismic support steel prepared in Examples 6~7 was higher than that in Example 4, indicating that when the weight ratio of Nb and Bi to Dy is 10~20:1, the tensile strength of the seismic support steel can be further improved.

[0039] Compared with Example 7, the composition of the reinforcing phase was changed in Examples 8 to 10. As a result, the tensile strength of the steel for seismic support prepared in Examples 9 to 10 was higher than that in Examples 7 and 8, indicating that when the reinforcing phase is composed of boron nitride whiskers and silicon nitride whiskers, and the mass ratio of boron nitride whiskers to silicon nitride whiskers is 3 to 6:1, the tensile strength of the steel for seismic support can be further improved.

[0040] 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 seismic support steel, characterized in that: The invention comprises a steel matrix and a reinforcement phase, wherein the steel matrix is ​​composed of the following components by weight percentage: C 0.35%-0.5%, Si 0.01%-0.03%, Mn 0.4%-0.7%, S 0.001%-0.005%, N 0.001%-0.004%, Al 0.02%-0.05%, Cu 0.001%-0.02%, V 0.2%-0.5%, Ti 0.01%-0.05%, Cr 0.2%-0.8%, Mo 0.3%-0.7%, Nb 0.01%-0.1%, Bi 0.005%-0.15%, Dy 0.001%-0.01%, and the balance is Fe and unavoidable impurities; The reinforcement phase is nitrogen-containing compound whiskers.

2. The high-strength seismic support steel according to claim 1, characterized in that: The weight ratio of Nb to Bi is 2:

3.

3. The high-strength seismic support steel according to claim 1, characterized in that: The weight ratio of the Nb and Bi to Dy is 10-20:

1.

4. The method for preparing high-strength seismic support steel according to claim 1, characterized in that: The nitrogen-containing compound whiskers include boron nitride whiskers and silicon nitride whiskers.

5. The method for preparing high-strength seismic support steel according to claim 4, characterized in that: The mass ratio of the boron nitride whisker to the silicon nitride whisker is 3-6:

1.

6. A method for preparing high-strength seismic support steel according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, after mixing the materials according to the components, smelting and refining to obtain molten steel; S2, adding a reinforcing phase to the molten steel, and obtaining a steel billet after die casting; S3. The steel billet is subjected to heat treatment to obtain steel for earthquake-resistant support.

7. The method for preparing high-strength seismic support steel according to claim 6, characterized in that: The added amount of the reinforcing phase is 2‰~6‰ of the mass of the molten steel.

8. The method for preparing high-strength seismic support steel according to claim 6, characterized in that: The heat treatment includes quenching and tempering.

9. The method for preparing high-strength seismic support steel according to claim 8, characterized in that: The quenching temperature is 850-950° C., and the quenching time is 2-5 hours; the tempering temperature is 450-550° C., and the tempering time is 5-8 hours.

10. Use of the high-strength steel for earthquake-resistant support according to any one of claims 1 to 5 or the preparation method of the high-strength steel for earthquake-resistant support according to any one of claims 6 to 9 in earthquake-resistant support.

Images