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Preparation method of low-cost hrb400ce chloride ion corrosion-resistant steel bar product

An ion corrosion, low-cost technology, applied in the field of metallurgy, can solve problems such as the loss of steel bar cross-sectional area, reduce the service life of reinforced concrete structures, steel bar corrosion, etc., and achieve the effect of improving the performance of chloride ion corrosion resistance

Active Publication Date: 2022-06-17
福建三宝钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If this aggressiveness is not mitigated, it can accelerate the deterioration of reinforced concrete structures, potentially leading to a series of associated serious consequences, including but not limited to cracking and spalling of concrete cover, loss of reinforcement cross-sectional area, degraded steel-concrete interface bonding, ultimately reducing the service life of reinforced concrete structures
[0003] At present, there is no good solution to the problem of corrosion of steel bars by chloride ions. We can only use alloying elements such as Ni, Cu, and Al to improve corrosion resistance during steel smelting. In order to solve the problem of corrosion of steel bars in concrete, chlorine resistance is urgently needed. Ion-corroded steel products

Method used

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  • Preparation method of low-cost hrb400ce chloride ion corrosion-resistant steel bar product
  • Preparation method of low-cost hrb400ce chloride ion corrosion-resistant steel bar product

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preparation example Construction

[0031] The preparation method of low-cost HRB400cE chloride ion corrosion-resistant steel bar product includes the following steps;

[0032] S1. Desulfurization and smelting: use an electric furnace to heat scrap steel and molten iron to 1600-1800 °C, stir the molten iron in the molten iron tank by rotating agitator to make the molten iron vortex, and roll the added desulfurizing agent into the molten iron to fully react, so as to realize the molten iron Desulfurization has the characteristics of high desulfurization efficiency, less desulfurization agent consumption, and low metal loss, so that it can be completely melted to obtain molten steel;

[0033] S2. Refining: Transfer the molten steel obtained in S1 to the refining furnace, and heat it up to 1600-1900 °C, and then add the C, Mn, Si, Cr, Cu, Ti, Ni and Sc elements to the refining furnace according to the mass ratio. Refining in the middle to obtain refined molten steel;

[0034] S3. Deoxidation: The powdery deoxidize...

Embodiment 1

[0048]The low-cost HRB400cE chloride ion corrosion resistant steel bar is characterized in that the chemical elements contained in mass percentages are: C 0.02%, Mn 0.7%, Si 0.5%, S 0.008%, P 0.006%, Cr 0.05%, Cu 0.10% , Ti 0.6%, Ni 0.10%, In 0.02%, Sc 0.02%, and the rest is Fe.

[0049] Preparation:

[0050] Use an electric furnace to heat scrap steel and molten iron to 1600-1800 °C, stir the molten iron through a stirrer in the molten iron tank, make the molten iron vortex, and roll the added desulfurizing agent into the molten iron to fully react to make it completely melted to obtain molten steel. Transfer the obtained molten steel to a refining furnace, and heat it up to 1600-1900 °C, then add the C, Mn, Si, Cr, Cu, Ti, Ni and Sc elements prepared in a mass ratio into the refining furnace for refining to obtain refining. In molten steel, Mn is used to prevent hot brittleness caused by sulfur, but if its content is too large, it will lead to deterioration of material toug...

Embodiment 2

[0052] Low-cost HRB400cE chloride ion corrosion resistant steel bar, the chemical elements contained in mass percentage are: C 0.04%, Mn 1.4%, Si 1.0%, S 0.015%, P 0.01%, Cr 0.08%, Cu 0.12%, Ti 1.3% , Ni 0.14%, In 0.05%, Sc 0.10%, and the rest is Fe.

[0053] Preparation:

[0054] Use an electric furnace to heat scrap steel and molten iron to 1600-1800 °C, stir the molten iron through a stirrer in the molten iron tank, make the molten iron vortex, and roll the added desulfurizing agent into the molten iron to fully react to make it completely melted to obtain molten steel. Transfer the obtained molten steel to a refining furnace, and heat it up to 1600-1900 °C, then add the C, Mn, Si, Cr, Cu, Ti, Ni and Sc elements prepared in a mass ratio into the refining furnace for refining to obtain refining. In molten steel, Mn is used to prevent hot brittleness caused by sulfur, but when its content is too high, it will lead to deterioration of material toughness and weldability. In th...

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Abstract

The invention relates to the field of metallurgy technology, in particular to low-cost HRB400cE chloride ion corrosion-resistant steel bars, the chemical elements contained are: C 0.02-0.04%, Mn 0.7-1.4%, Si 0.5-1.0%, S 0.008-0.015 %, P 0.006~0.01%, Cr 0.05~0.08%, Cu 0.10~0.12%, Ti 0.6~1.3%, Ni 0.10~0.14%, In 0.02~0.05%, Sc 0.02~0.10%, and the rest is Fe; the present invention Relieve the corrosion effect of chloride ions on steel bars, and at the same time attach In metal film on the surface of steel bars, which further improves the resistance to chloride ion corrosion of steel bars, and at the same time ensures that steel bars will not be corroded for a long time.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a preparation method of a low-cost HRB400cE chloride ion corrosion-resistant steel bar product. Background technique [0002] Reinforcement corrosion is one of the main failure mechanisms of reinforced concrete structures in thermal, marine and industrial environments. It has become a major durability issue for investors and engineers. If this aggressiveness is not attenuated, it will accelerate the deterioration of reinforced concrete structures, which may lead to a series of related serious consequences, including but not limited to cracking and spalling of concrete cover, loss of cross-sectional area of ​​reinforcement, degraded steel-concrete interface bonding, ultimately reducing the service life of reinforced concrete structures. [0003] At present, there is no good solution to the problem of chloride ion corrosion of steel bars. Only alloying elements such as Ni, Cu,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/42C22C38/50C21C7/06C21C7/064C21D8/08C23C6/00
CPCC22C38/04C22C38/02C22C38/42C22C38/50C22C38/005C21C7/06C21C7/064C21C7/0037C21D8/08C23C6/00
Inventor 吴长锡吕维纯汪其茂何福胜
Owner 福建三宝钢铁有限公司