Method for improving strength of reinforcing steel bar

A technology for reinforcing steel and strength, applied in the field of improving the strength of steel bars, can solve the problems of increasing the manufacturing cost of steel bars, and achieve the effects of increasing strength and improving hardenability.

Pending Publication Date: 2020-07-28
海城市欣锐铸件有限公司
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  • Abstract
  • Description
  • Claims
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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 fierc

Method used

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  • Method for improving strength of reinforcing steel bar
  • Method for improving strength of reinforcing steel bar
  • Method for improving strength of reinforcing steel bar

Examples

Experimental program
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Example Embodiment

[0024] Example 1:

[0025] The specific steps are as follows:

[0026] 1) Use silica to add boric acid to manufacture 40 tons of induction furnace lining, silica refractoriness is 1800℃, water absorption rate is 2.3%, according to mass percentage, its specific composition is shown in Table 1, silica sand particle size distribution is shown in Table 2, boric acid The sand size distribution is shown in Table 3. Boric acid and silica sand are mixed uniformly by a drum machine, and water is added during the mixing. The amount of water added is 1.2% of the weight of the total sand.

[0027] Table 1 Chemical composition of silica,%

[0028]

[0029] Table 2 Granularity range of silica sand

[0030]

[0031] Table 3 Granularity range of boric acid sand

[0032]

[0033] 2) The furnace lining is formed by the masonry method, and the furnace lining material is baked before molding. The baking temperature is 320℃, and the baking time is 6 hours. After molding, it is sintered at a high temperatur...

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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...

Claims

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Application Information

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IPC IPC(8): C21C5/52C21C7/06C21C7/00C04B35/14C04B35/66
CPCC21C5/52C21C7/06C21C7/0006C04B35/66C04B35/14C04B2235/3409C04B2235/5427Y02P10/20
Inventor 姜利刘亚辉姜铁鑫
Owner 海城市欣锐铸件有限公司
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