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Corrosion-resistant twisted steel and production method thereof

A threaded steel bar and production method technology, applied in the field of iron and steel metallurgy, can solve the problems that the coating is easily damaged, it is difficult to use in large quantities, and the steel bar is exposed.

Active Publication Date: 2012-07-04
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem with epoxy coating is that the coating will age after 5 years and lose its protective effect. During the construction process, the coating will be easily damaged, which will aggravate local corrosion, cause the steel bar to fail early, and increase the cost per ton of steel by about 2,000 yuan.
Metal-coated steel bars will be corroded after being used for a period of time, making the steel bars exposed and corroded, and the welding problem is difficult to solve
Stainless steel bars will form galvanic corrosion with other steel bars, accelerate the corrosion of other parts, and reduce the life of the overall component, and the cost of stainless steel bars is too high to be used in large quantities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 The components of the steel bars in this embodiment are: C 0.21%, Si 0.63%, Mn 0.56%, P 0.025%, S 0.008%, Cr 0.90%, Cu 0.06%, and V 0.034%. The production process of the steel bar is as follows: using electric furnace smelting, adding ferrosilicon and silicomanganese alloy to deoxidize at 1 / 4 of the tapping process, and adding carbon powder and slagging material to prevent a large amount of slagging during tapping. High alkalinity slag is used in the refining process, and the binary alkalinity of the final slag is controlled at 3.0-4.0, and the white slag time is greater than 15 minutes. Ferro-phosphorus is added during the refining process, and the content of P is controlled at 0.020-0.035%. After the refining is completed, the calcium-iron alloy wire is fed, and the soft stirring time is about 7 minutes. Continuous casting adopts protective casting. The cross-sectional dimension of the continuous casting billet is 150mm×150mm and the length is 16m; the dra...

Embodiment 2

[0026] Embodiment 2 The components of the steel bars in this embodiment are: C 0.23%, Si 0.54%, Mn 0.48%, P 0.028%, S 0.007%, Cr 0.85%, Cu 0.12%, V 0.029%, and Ti 0.032%. The production process of the steel bar is as follows: converter smelting is used, ferrosilicon and silicomanganese alloy are added to deoxidize at 1 / 4 of the tapping process, and carbon powder and slagging materials are added to prevent a large amount of slagging during tapping. High alkalinity slag is used in the refining process, and the binary alkalinity of the final slag is controlled at 3.0-4.0, and the white slag time is greater than 15 minutes. Ferro-phosphorus is added during the refining process, and the content of P is controlled at 0.020-0.035%. After the refining is completed, the calcium-iron alloy wire is fed, and the soft stirring time is about 8 minutes. Continuous casting adopts protective casting. The cross-sectional dimension of the continuous casting billet is 150mm×150mm and the length is...

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Abstract

The invention discloses corrosion-resistant twisted steel and a production method thereof. The twisted steel comprises the following components (weight percentage): basic components, a selective component and remain iron and impurities, wherein the basic components comprise carbon (C) 0.18-0.25%, silicon 0.40-0.80%, manganese (Mn) 0.30-1.00%, phosphorus (P) 0.02-0.04%, sulfur (S)<=0.01%, chromium(Cr) 0.45-1.00% and copper (Cu) 0.05-0.20%, and the selective component is the combination of any one or more than two components of vanadium (V) 0.01-0.05%, niobium (Nb) 0.01-0.04%, nickel (Ni) 0.01-0.20%, titanium (Ti) 0.01-0.05% and boron (B) 5-30ppm. The production process comprises electric furnace or converter smelting, refining out of the furnace, square blank continuous casting, hot rolling, cold bed air cooling, multiple length shearing and an end-flattening procedure which are performed sequentially, the corrosion service life of the corrosion-resistant twisted steel is more than 1.5 times that of a conventional steel product, and production cost, mechanical property, welding performance, processing performance and the like are identical with the conventional product.

Description

Technical field [0001] The invention particularly relates to a corrosion-resistant threaded steel bar and a production method thereof, belonging to the field of iron and steel metallurgy. Background technique [0002] Rebar is an important building material and is widely used in civil engineering construction such as houses, bridges, and roads. my country is a major producer of rebar, with an output of 131 million tons in 2010, accounting for more than 70% of global output. At present, our country is at the peak of modernization, housing and infrastructure construction is booming, which strongly supports the pace of social modernization. However, there are also some problems that cannot be ignored in large-scale construction. At present, the average life span of buildings in my country is only 25-30 years, which is lower than the 50-60 years stipulated by national standards and far lower than that of Western developed countries such as the United States. The average life span of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24
Inventor 麻晗黄文克李璇周铖
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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