Steel for anti-corrosion steel bar for tropical ocean atmospheric environment concrete structure and production method thereof

Abstract

The invention discloses an anti-corrosion steel bar for a tropical ocean atmospheric environment concrete structure and a production method thereof, and belongs to the technical field of anti-corrosion materials. The steel bar comprises the following chemical components in percentage by weight: C: 0.16-0.21%, Si: 0.35-0.65%, Mn: 0.70-1.20%, P: less than or equal to 0.030%, S: less than or equal to0.030%, Cr: 0.40-1.00%, Cu: less than or equal to 0.35, Ni: less than or equal to 0.45%; Mo: 0.10-0.20%, Ti: less than or equal to 0.025%, V: 0.030-0.050%, N: less than or equal to 0.0080%, and the balance Fe and inevitable impurities. A small amount of alloy elements are added on the basis of the carbon steel bar, and through optimization of the content and proportion of the alloy elements, thenovel steel bar with excellent corrosion resistance is obtained. The steel for the anti-corrosion steel bar meets the requirements of mechanical performance and welding performance of the tropical marine atmospheric environment concrete structure, the corrosion resistance of the steel bar is 2-4 times that of HRB400E steel bars, and the durability of the reinforced concrete structure can be effectively prolonged.

Description

technical field [0001] The invention belongs to the field of corrosion-resistant materials, and relates to steel for corrosion-resistant reinforcing bars for concrete structures in tropical marine atmospheric environments and a production method. Background technique [0002] Reinforcement plays the role of skeleton support in concrete structures. It is a main common material in engineering building materials. It is widely used in industrial and civil construction fields such as houses, cross-sea bridges and highways. The theoretical service life of reinforced concrete is longer, but in actual projects, there are many cases of premature failure of reinforced concrete, which not only increases maintenance costs, but also causes a great waste of energy and resources. According to statistics, the concrete structure of civil buildings in my country's inland areas will peel off after 15 to 25 years of use; however, corrosion and peeling of steel bars have occurred in civil buildi...

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Problems solved by technology

The patent No. 201020574823.2 is the invention patent of "an improved structure of epoxy steel bar". In this patent, the steel bar is first coated with a galvanized layer by a chemical method, and then a layer of epoxy is coated on the galvanized layer by a physical method. Resin coating, the double protective effect makes the corrosion resistance of steel bars stronger. However, the galvanized layer on the surface of galvanized steel bars corrodes quickly, the corrosion resistance is limited, and welding is difficult; The preparation method of the stainless steel reinforcement ", the patent developed a stainless steel reinforcement, its corrosion resistance is better than 316L stainless steel reinforcement, but the reinforcement contains 2.0-8.0% Cr and 1.50-2.50% Mo, the content of alloy elements is relatively high, Rebar is expensive

The standard of "High Corrosion Resistance Alloy Ribbed Steel Bars for Marine Engineering Concrete" stipulates the content of alloying elements: C≤0.08%, Si≤0.80%, Mn≤2.50%, P≤0.02%, S≤0.02%, Cu≤0.50%, Cr: 7.0-10.0%, Mo: 0.8-1.8%, Sn≤0.3%, V: 0.03-0.15%, the alloy element content of this steel bar is high, the price is much higher than that of ordinary steel bars, and it cannot be used in large quantities in engineering; In 2014, the Institute issued the industry standard "Corrosion Resistant Steel Bars for Reinforced Concrete", which stipulates that the content of alloy elements C≤0.21%, Si≤0.80%, Mn≤1.60%, P≤0.03%, S≤0.03%, Cu: 0.2 ~0.6%, Cr: 0.3~1.6%, Ni ≤ 0.65%, Mo ≤ 0.3%, the production cost of the steel bar is low, and the corrosion resistance is enhanced, but it is still unclear whether the content of alloy elements in the low alloy steel bar with optimal corrosion resistance and Proportion

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