Method for improving strength of reinforcing steel bar

Abstract

The invention relates to the field of ferrous metallurgy, and particularly relates to a method for improving strength of a reinforcing steel bar. The method comprises the following specific operationsteps of: 1) adopting silica as a furnace lining material of a smelting furnace, reasonably grading the granularity of silica sand, and adding boric acid into the sand as an additive; 2) forming and sintering a furnace lining, and then using the furnace lining in the smelting furnace, wherein the boron content of molten steel is 0.0005% to 0.0030%; and 3) completing the processes of deoxidation and alloying of the molten steel in the smelting furnace, increasing a titanium element, ensuring that the content of the titanium element in the molten steel is 0.02% to 0.03%, and casting the molten steel into a square billet to prepare a reinforcing steel bar product. Compared with the prior art, the method has the beneficial effects that carbon in the molten steel and B2O3 in the furnace liningare subjected to a chemical reaction, a trace boron element is subjected to solid solution at a crystal boundary, the generation of proeutectoid ferrite is inhibited, and a part of strengthened structures such as martensite and bainite can be generated in an internal structure under the same cooling condition in a subsequent rolling process, so that the strength of the reinforcing steel bar is improved.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for increasing the strength of steel bars. Background technique [0002] Reinforcement refers to steel for reinforced concrete and prestressed reinforced concrete, which is circular in cross-section and sometimes square with rounded corners. Including plain round bars, ribbed bars, twisted bars. Reinforced concrete composite structures are currently the preferred form of civil engineering structure design, and are widely used in various building structures, especially in large, heavy, light thin-walled and high-rise buildings. [0003] Steel bars for reinforced concrete refer to the straight or coiled steel used for reinforced concrete reinforcement. Its shape is divided into two types: smooth round steel bar and deformed steel bar. The delivery state is straight bar and coiled round. Light round steel bars are actually small round bars and discs of ordinary lo...

AI Technical Summary

Problems solved by technology

However, with the increase in the addition of alloying elements, the manufacturing cost of steel bars has increased significantly. In the fierce market competition, how to produce high-strength steel bars at low alloy costs has become a common problem faced by metallurgical enterprises.

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