Cl- corrosion resistant high-strength low-alloy steel bar and production method thereof

Abstract

The invention discloses a Cl- corrosion resistant high-strength low-alloy steel bar and a production method thereof, and belongs to the technical field of steel bars. The alloy in a basic alloy system comprises the following elements in percentage by weight: 0.08 to 0.25 percent of C, 0.35 to 1.1 percent of Si, 0.7 to 2.0 percent of Mn, 0.05 to 0.10 percent of P, 0.010 percent of S, 0.30 to 1.60 percent of Cr, 0.2 to 0.80 percent of Cu, 0.2 to 1.0 percent of Ni, and the balance of Fe and inevitable impurity elements; and one or more of micro alloy elements comprising V, Nb, Ti, B and the like can be added with trace according to the performance requirement of the steel bar, and the total amount of the micro alloy elements is controlled in a range of 0.01 to 0.5 percent. The steel bar has the advantage of economic and reasonable cost, and the Cl- corrosion resistance of the steel bar is obviously superior to that of carbon steel. The performance index of the steel bar meets the requirement of 400MPa-grade steel bars in GB1499-2007; and the steel bar has good welding performance and mechanical connection performance, and is applied to a concrete structure with durability design requirement under the marine environment condition.

Description

technical field [0001] The invention belongs to the technical field of steel bars, in particular to a Cl-resistant - Corroded high-strength low-alloy steel bars and production method having excellent resistance to Cl - Corrosion performance, its performance index meets the requirements of GB1499-2007, and it is suitable for use in concrete structures with durability design requirements under marine environmental conditions. Background technique [0002] Reinforced concrete is an economical and convenient building material. However, its corrosion deterioration directly affects the durability of buildings. Among them, with Cl - Corrosion damage is the most serious. my country's mainland coastline is 18,400 kilometers long, and large-scale infrastructure is mostly concentrated in coastal areas, especially marine projects such as wharves, slope protection, and protection dikes, which are caused by chloride ions. Corrosion and damage to steel bars are very prominent. At the ...

AI Technical Summary

Problems solved by technology

[0005] Increasing the thickness and density of the protective layer is detrimental to the load bearing of the structure, and the cost also needs to be considered

Epoxy-coated and galvanized steel bars are prone to damage during transportation, resulting in increased localized corrosion

And at high Cl - Under the condition of high concentration, the coated steel bar is easy to delaminate, which accelerates the corrosion of the steel bar

A large amount of alloying elements Cr and Ni are added to the existing stainless steel bars, and the chromium content is generally not less than 12%, and the high one even reaches 18%. The material price is high and cannot be widely used

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