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400MP class a seismic chloride-corrosion-resistant reinforcing steel bar and manufacturing method thereof

A technology of ion corrosion and manufacturing method, applied in the field of metallurgy, can solve the problems of corrosion, reduce the durability of the structure, change the stress state of the structure, etc., and achieve the effect of good corrosion resistance, improved strength and service life

Inactive Publication Date: 2018-12-18
BAOTOU IRON & STEEL GRP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

After the steel bars used in concrete are corroded by chloride ions, the concrete will crack and the bond between the steel bars and the concrete will be reduced.
[0003] After corrosion, the volume of the steel bar will increase by 2 to 10 times, and the pressure on the surrounding concrete will cause the concrete to crack along the direction of the steel bar, and then the protective layer will fall off in pieces, and the cracks and peeling of the protective layer will further lead to more severe corrosion and changes. Structural Stress State and Reduced Durability of Structures

Method used

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  • 400MP class a seismic chloride-corrosion-resistant reinforcing steel bar and manufacturing method thereof
  • 400MP class a seismic chloride-corrosion-resistant reinforcing steel bar and manufacturing method thereof

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Embodiment 1

[0023]The chemical composition of the 400MPa grade earthquake-resistant chloride ion corrosion-resistant steel bars in this example is shown in Table 1. The main preparation process of the steel bar is: molten iron desulfurization-converter-LF refining-continuous casting-rolling. Hot metal desulfurization: Remove blast furnace slag before desulfurization to improve desulfurization efficiency; take iron ore and melt it into molten iron, and the molten iron is desulfurized by KR method. Lime powder and fluorite mixed with a desulfurizer at a mass ratio of 9:1, stirred for 10 minutes, and left to stand for 5 minutes. Remove the desulfurization slag after the molten iron is desulfurized to stabilize the desulfurization effect, prevent the desulfurization slag from entering the converter and cause the converter to return to sulfur, and ensure that the sulfur content in the steel is controlled below 0.01%. Converter: Decarburization and dephosphorization are carried out by top-bott...

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Abstract

The invention relates to a 400MP class a seismic chloride-corrosion-resistant reinforcing steel bar and a manufacturing method thereof. The 400MP class a seismic chloride-corrosion-resistant reinforcing steel bar comprises the chemical compositions of, by weight, 0.13-0.18% of C, 0.20-0.60% of Si, 0.95-2.0% of Mn, 0.10-12.0% of Cu, 0.20-2.50% of Cr, 0.0-2.0% of Ni, 0.0-2.8% of V and 0.0-2.0% of RE, the balance Fe and inevitable impurities elements. The reinforcing steel bar has the following advantages that the corrosion resistance of the reinforcing steel bar is good, the strength of the reinforcing steel bar is further improved, and the service life of the reinforcing steel bar is further prolonged.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a 400MPa-grade shock-resistant chloride ion corrosion-resistant steel bar and a manufacturing method for a 400MPa-grade shock-resistant chloride ion corrosion-resistant steel bar. Background technique [0002] A large number of reinforced concrete structures are used in corrosive environments with chloride salt as the main medium, such as natural chlorine salt corrosive environments such as oceans, salt lakes, and saline-alkali lands, as well as artificial chlorine salt corrosive environments such as roads and bridges sprinkled with ice salt. In the environment, it will cause corrosion of steel bars for concrete. There are many corrosion factors, and the corrosion mechanism is also different. It is generally divided into three forms: electrochemical corrosion, chemical corrosion and stress corrosion. After the steel bars used in concrete are corroded by chloride ions, the conc...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/58C22C38/46C21C1/02C21C5/36C21C5/35C22C33/06C21C7/06C21D8/08
CPCC21C1/02C21C5/35C21C5/36C21C7/06C21D8/08C22C33/06C22C38/005C22C38/02C22C38/04C22C38/42C22C38/46C22C38/58
Inventor 赵晓敏涛雅白月琴吕刚宋振东
Owner BAOTOU IRON & STEEL GRP
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