A kind of hrb500 anti-seismic steel bar and its production process

A technology of anti-seismic steel bars and molten steel, applied in the field of metallurgy, to achieve the effects of improving welding performance, inhibiting grain coarsening, and improving performance

Active Publication Date: 2019-03-22
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that the micro-alloying process is adopted in my country to produce 500MPa anti-seismic steel bars, Ti, Nb, V alloy resources are consumed and the cost is relatively high. Technical issues of improving the strength and toughness of steel bars, thereby reducing costs

Method used

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  • A kind of hrb500 anti-seismic steel bar and its production process
  • A kind of hrb500 anti-seismic steel bar and its production process
  • A kind of hrb500 anti-seismic steel bar and its production process

Examples

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Effect test

Embodiment 1

[0034]This embodiment provides a kind of HRB500 anti-seismic steel bar, which contains calcium-based composite particle precursors in the anti-seismic steel bar, wherein: the molten steel of the steel bar is composed of the following elements in terms of mass fraction: C is 0.21%, and Si is 0.58 %, Mn is 1.34%, S is 0.038%, P is 0.022%, the balance is Fe, and the sum of the percentages of elements is 100%.

[0035] The production process of the HRB500 anti-seismic steel bar in this embodiment is as follows: the molten steel of the steel bar is smelted in molten steel, and when the steel is tapped, silicon-manganese is first added to the ladle for alloying, and then ferrosilicon or aluminum alloy is added for pre-deoxidation, and the molten steel is poured into the tundish Finally, add calcium carbide to the crystallizer for final deoxidation, control the amount of calcium carbide added so that the oxygen content in the molten steel of the steel bar drops to 32ppm, and produce c...

Embodiment 2

[0056] This embodiment provides a 500MPa earthquake-resistant steel bar, which contains calcium-based composite particles.

[0057] Among them: the molten steel of the steel bar is composed of the following elements in terms of mass fraction: C is 0.22%, Si is 0.61%, Mn is 1.34%, S is 0.036%, P is 0.022%, and the balance is Fe, the mass of the element The sum of the percentages is 100%.

[0058] Production process: the production method of this embodiment is the same as that of embodiment 1, the only difference being that in this embodiment, the amount of calcium carbide added is controlled so that the oxygen content in the molten steel of the steel bar is reduced to 41ppm.

[0059] After testing, the calcium-based composite particles are composed of the following elements in terms of mass fraction: 14.8% Ca, 12.7% Si, 2% Al, 32% Mn, 4.5% S, and 34% O.

[0060] In the steel bars prepared in this example, the number of calcium-based composite particles with a size of 0.5-3 μm ...

Embodiment 3

[0062] This example provides a 500MPa earthquake-resistant steel bar, which contains calcium-based composite particles. Among them: the molten steel of the steel bar is composed of the following elements in terms of mass fraction: C is 0.23%, Si is 0.8%, Mn is 1.2%, S is 0.045%, P is 0.045%, and the balance is Fe, the mass of the element The sum of the percentages is 100%.

[0063] Production process: the production method of this embodiment is the same as that of embodiment 1, the only difference is that in this embodiment, the amount of calcium carbide added is controlled so that the oxygen content in the molten steel of the steel bar is reduced to 36ppm.

[0064] After testing, the calcium-based composite particles are composed of the following elements in terms of mass fraction: 15% Ca, 13% Si, 3% Al, 35% Mn, 4% S, and 30% O.

[0065] In the steel bars prepared in this example, the number of calcium-based composite particles with a size of 0.5-3 μm reaches 2600 / mm 2 . T...

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Abstract

The invention provides a 500MPa earthquake-resistant steel bar and its production process. The steel bar contains calcium-based composite particles, including the following elements: 10% to 15% of Ca, 12% to 13% of Si, 2% to 3% of Al, Mn is 30%-35%, S is 4%-5%, O is 30%-35%, and the sum of element mass percentages is 100%. In the production process, after the molten steel is poured into the tundish, calcium carbide is added to the crystallizer for final deoxidation, and the amount of calcium carbide added is controlled so that the oxygen content in the molten steel of the steel bar is reduced to 30-50ppm, and calcium-based composite particles are produced. Cool at 500°C at a rate of 5-15°C / s. In the present invention, a certain amount of calcium carbide is added to the crystallizer to deoxidize again after the molten steel is tapped, so that a large amount of dispersed fine particles such as CaO are generated in the steel. The inner acicular ferrite is formed to refine the original austenite grains, thereby improving the strength and toughness of the steel bar.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a 500MPa-grade anti-seismic steel bar, in particular to a 500MPa anti-seismic steel bar and a production process. Background technique [0002] Frequent earthquakes make people put forward higher requirements for the seismic safety of civil and bridges, tunnels and other buildings. The higher the strength level of the steel bar, the higher its shock resistance must be guaranteed, such as the higher technical content of strength-to-yield ratio, uniform extension, and low-cycle fatigue. The 500MPa grade steel bar is the highest grade of hot rolled steel bar in my country at present, which can meet the needs of high-strength and large-scale steel bars for high-rise, super high-rise buildings and large-scale frame structures. It also has good plasticity and seismic performance. It can replace HRB335 steel bars It can save more than 28% of consumption, and can save 14% of consumption by replaci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C38/04C22C38/02C22C38/60C21C7/06C21C7/076C21D8/08C21D8/06
CPCC21C7/06C21C7/076C21D8/06C21D8/065C21D8/08C21D2211/001C21D2211/005C22C30/00C22C38/002C22C38/02C22C38/04C22C38/60Y02P10/20
Inventor 张朝晖赵福才刘世锋秦偲杰孔维明刘创
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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