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Reinforcing steel bar and preparation method thereof

A steel bar and molten steel technology, applied in the field of alloy steel, can solve problems such as poor corrosion resistance and failure to reach the designed service life of reinforced concrete structures, achieve low cost, improve pitting corrosion resistance and intergranular corrosion resistance, and improve use The effect of longevity

Active Publication Date: 2014-09-03
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is to overcome the technical defect that the steel bar in the prior art has poor corrosion resistance in the marine environment and cannot reach the designed service life of the reinforced concrete structure, thereby providing a steel bar with excellent corrosion resistance. Reinforcing bar with properties and comprehensive mechanical properties and preparation method thereof

Method used

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  • Reinforcing steel bar and preparation method thereof
  • Reinforcing steel bar and preparation method thereof
  • Reinforcing steel bar and preparation method thereof

Examples

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Embodiment 1

[0053] The present embodiment provides a steel bar, which is composed of the following elements: C, Si, Mn, P, S, Cr, Mo, Sn, RE, Fe and unavoidable impurities, wherein the weight percentage of each composition is as shown in Table 1, The mechanical properties are shown in Table 2, and the corrosion resistance is shown in Table 3.

[0054] Present embodiment also provides a kind of production method of reinforcing bar, comprises the steps:

[0055] S1: The step of pre-desulfurizing the molten iron by the KR method, and controlling the sulfur content to no more than 0.01%, because the sulfur element as an impurity element will reduce the mechanical properties and corrosion resistance of the steel, and the sulfur element cannot usually be removed in the converter Therefore, in order to reduce the sulfur content in the steel, it is necessary to pre-desulfurize the steel in molten iron. Before desulfurization, in order to improve the desulfurization efficiency, it is necessary to ...

Embodiment 2

[0062] The present embodiment provides a steel bar, which is composed of the following elements: C, Si, Mn, P, S, Cr, Mo, Sn, RE, Fe and unavoidable impurities, wherein the weight percentage of each composition is as shown in Table 1, The mechanical properties are shown in Table 2, and the corrosion resistance is shown in Table 3.

[0063] Present embodiment also provides a kind of production method of reinforcing bar, comprises the steps:

[0064] S1: The step of pre-desulfurizing the molten iron by the KR method, and controlling the sulfur content to no more than 0.01%, because the sulfur element as an impurity element will reduce the mechanical properties and corrosion resistance of the steel, and the sulfur element cannot usually be removed in the converter Therefore, in order to reduce the sulfur content in the steel, it is necessary to pre-desulfurize the steel in molten iron. Before desulfurization, in order to improve the desulfurization efficiency, it is necessary to re...

Embodiment 3

[0071] The present embodiment provides a steel bar, which is composed of the following elements: C, Si, Mn, P, S, Cr, Mo, Sn, RE, Fe and unavoidable impurities, wherein the weight percentage of each composition is as shown in Table 1, The mechanical properties are shown in Table 2, and the corrosion resistance is shown in Table 3.

[0072] Present embodiment also provides a kind of production method of reinforcing bar, comprises the steps:

[0073] S1: The step of pre-desulfurizing the molten iron by the KR method, and controlling the sulfur content to no more than 0.01%, because the sulfur element as an impurity element will reduce the mechanical properties and corrosion resistance of the steel, and the sulfur element cannot usually be removed in the converter Therefore, in order to reduce the sulfur content in the steel, it is necessary to pre-desulfurize the steel in molten iron. Before desulfurization, in order to improve the desulfurization efficiency, it is necessary to ...

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Abstract

The invention relates to a reinforcing steel bar. The reinforcing steel bar comprises the following components in percentage by weight: 0.005%-0.030% of C, 0.3%-0.6% of Si, 1.2%-2.5% of Mn, not greater than 0.01% of P, not greater than 0.01% of S, 8.0%-10.0% of Cr, 1.0%-3.0% of Mo, 0.2%-0.4% of Sn, 0.01%-0.05% of RE, and the balance of Fe and inevitable impurities. The invention further provides a preparation method for the reinforcing steel bar. The reinforcing steel bar disclosed by the invention has excellent comprehensive mechanical performance and corrosion resistance, prolongs service life of the reinforcing steel bar in seawater while satisfying requirements of an anti-seismic design, and can be widely applied to a reinforced concrete structure in a marine environment.

Description

technical field [0001] The invention relates to a steel bar and a preparation method thereof, belonging to the field of alloy steel. Background technique [0002] With the enhancement of marine strategic awareness of various countries and the development of modern marine science and technology, the construction of infrastructure such as large bridges across rivers and seas, seaport terminals and offshore buildings has entered a peak period. At the same time, the durability of steel bars as the main structural material has become increasingly prominent. The marine environment is a relatively harsh corrosive environment in nature. Its special conditions of high temperature, high humidity, and high salt can easily cause steel corrosion. The reinforced concrete structures in my country's coastal areas generally suffer from severe corrosion after 10-15 years of service. The structure is damaged and cannot meet the 50-year design service life. [0003] There are two main ways to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/22C22C38/28C22C38/24C21C1/02C21C5/30C21C7/10C21C7/068C21C7/06C21D8/08
CPCC21D8/08C21C1/02C21C5/30C21C7/06C21C7/068C21C7/10C22C38/22C22C38/24C22C38/28C22C38/38B22D11/001C21C5/28C21C7/064C21D8/065C21D9/525C21D2211/002C21D2211/005C22C38/002C22C38/004C22C38/005C22C38/008C22C38/02C22C38/04C22C38/18C22C38/60
Inventor 张建春麻晗黄文克李阳左龙飞
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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