Anti-corrosion high strength-to-yield ratio earthquake-resistant reinforced bar and production method thereof

Abstract

The invention provides an anti-corrosion high strength-to-yield ratio earthquake-resistant reinforced bar and a production method of the anti-corrosion high strength-to-yield ratio earthquake-resistant reinforced bar. The threaded reinforced bar includes basic ingredients, selectable ingredients and the balance Fe and inevitable impurities, wherein the basic ingredients comprise, by weight, 0.06-0.10% of C, 0.60-0.80% of Si, 0.60-1.00% of Mn, 0.01% or smaller of P, 0.01% or smaller of S, 3.20-3.50% of Cr, 0.70-0.90% of Al, 0.35-0.45% of Mo and 0.70-0.90% of Ni, and the selectable ingredients comprise any one or the combination of two of, by weight, 0.01-0.06% of V and 0.01-0.030% of Nb. The anti-corrosion high strength-to-yield ratio earthquake-resistant reinforced bar has the advantages that the sea water resistance of the reinforced bar is good and can be improved by three times or above compared with common threaded reinforced bars, the high elongation rate and the high strength-to-yield ratio are obtained, and the strength-to-yield ratio can reach 1.50 or above, and the earthquake resistance is excellent.

Description

technical field [0001] The invention relates to a corrosion-resistant high-strength yield ratio earthquake-resistant steel bar and a production method thereof, belonging to the fields of iron and steel metallurgy and steel rolling. Background technique [0002] With the development of various engineering structures such as buildings, bridges, machinery, and pressure vessels in the direction of large-scale, multi-functional, and high-parameters, the market demand for high-strength, high-grade, and large-thickness steel plates is gradually increasing. At the same time, the quality and performance of thick plates The requirements are also getting higher and higher, such as low temperature toughness, lamellar tear resistance, forming and welding properties, etc. An important reason that restricts the production and stable performance of thick plates is that the toughness becomes worse with the increase of thickness, especially the toughness of the core of steel plates above 60mm...

AI Technical Summary

Problems solved by technology

However, this process route is difficult to ensure stable performance in the thickness direction of the thick plate. For example, compared with other thickness positions, the core of the steel plate above 60mm has a coarser grain size and poorer toughness.

[0004] With the widespread use of reinforced concrete structures, cases of premature failure of concrete structures caused by corrosion of steel bars are common, causing serious economic losses

Especially in the harsh marine environment, the corrosion of steel bars is a major technical problem. At present, the better seawater corrosion-resistant steel bars are stainless steel bars, but their cost is high, and most projects cannot bear the high cost. By adding alloy elements to improve the general The corrosion resistance of the steel bar itself, especially the seawater corrosion resistance, can further increase the life of the construction project, and at the same time only slightly increase the cost, which is an effective means to improve the life of the project

[0005] Recently, a lot of research and development have been carried out on seawater corrosion-resistant steel at home and abroad, but there are certain limitations. It is difficult to achieve the combination of corrosion resistance and application promotion. High corrosion resistance

For example, Chinese patent CN102605255A discloses a 400MPa steel bar, its components and contents are: C0.1%-0.25%, Si 0.5%-0.90%, Mn 0.7%-1.5%, P 0.04%-0.09%, S≤ 0.015%, Cu0.3%-0.6%, Ni 0.1%-0.4%, Cr≤0.1%, V 0.03%-0.08%, the remainder is Fe and unavoidable impurities, which add higher Cu elements, although there are It is conducive to improving corrosion resistance, but it is easy to cause hot cracking problems, and its corrosion resistance has not been improved to an ideal level. US Patent 1141403 discloses low-carbon steel with excellent mechanical properties and corrosion properties and its manufacturing method, containing Cr 1.0 ~ 13.0%, Si 0.5 ~ 2.0%, no quantitative index for the improvement of its corrosion resistance, and its elongation after fracture is 7%, and the plasticity of the steel bar is poor

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