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Corrosion resisting and shock resisting steel with high strength and preparation method thereof

A technology of corrosion-resistant and earthquake-resistant steel, applied in the direction of temperature control, etc., can solve the problems of difficult construction, uncertain anti-corrosion effect, high cost, etc., to improve passivation corrosion resistance, strong process applicability and controllability, and improve use The effect of longevity

Active Publication Date: 2013-01-09
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the corrosion of steel bars, anti-corrosion technologies such as stainless steel bars, galvanized steel bars, epoxy-coated steel bars, cathodic protection methods, and rust inhibitors have emerged in foreign countries, and relevant standards have been formulated, which delays the initiation of steel bar corrosion to a certain extent. time, but there are disadvantages such as high cost, difficult construction or uncertain anti-corrosion effect

Method used

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  • Corrosion resisting and shock resisting steel with high strength and preparation method thereof
  • Corrosion resisting and shock resisting steel with high strength and preparation method thereof
  • Corrosion resisting and shock resisting steel with high strength and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A. Put molten iron, scrap steel, pig iron and slagging agent into the LD steelmaking converter according to the routine, carry out the conventional top-bottom compound blowing, and make slag according to the routine, control the carbon content of the end point to 0.03 wt%, and the tapping temperature to 1680 ℃ , and before tapping, add lime and fluorite to the bottom of the ladle, the addition amount is controlled as lime 3kg / t steel, fluorite 0.4 kg / t steel, and then tap;

[0043] B. During the tapping process, when the amount of molten steel in the ladle reaches 1 / 5, deoxidation and alloying treatment is carried out, that is, composite deoxidizer, silicon-manganese alloy, ferrosilicon, medium carbon ferrochromium, ferro-niobium, and vanadium are sequentially added to the ladle Nitrogen alloy, and when ladle molten steel amount reaches 3 / 4, add described each alloy, the add-on of each alloy is:

[0044] Composite deoxidizer 0.8 kg / t steel,

[0045] Silicon manganese a...

Embodiment 2

[0063] A. Put molten iron, scrap steel, pig iron and slagging agent into the LD steelmaking converter according to the routine, carry out the conventional top-bottom compound blowing, and make slag according to the routine, control the carbon content of the end point to 0.06 wt%, and the tapping temperature to 1680 ℃ , and before tapping, add lime and fluorite to the bottom of the ladle, and the amount of addition is controlled as lime 2kg / t steel and fluorite 0.6 kg / t steel;

[0064] B. During the tapping process, when the amount of molten steel in the ladle reaches or exceeds 1 / 5, deoxidation and alloying treatment is carried out, that is, composite deoxidizer, silicon-manganese alloy, ferrosilicon, medium-carbon ferrochrome, and ferroniobium are sequentially added to the ladle , vanadium-nitrogen alloy, and when the ladle molten steel amount reaches 3 / 4, add described each alloy, the addition of each alloy is:

[0065] Composite deoxidizer 0.9 kg / t steel,

[0066] Silicon ...

Embodiment 3

[0084] A. Put molten iron, scrap steel, pig iron and slagging agent into the LD steelmaking converter according to the routine, carry out the conventional top-bottom compound blowing, and make slag according to the routine, control the carbon content of the end point to 0.05 wt%, and the tapping temperature to 1680 ℃ , and before tapping, add lime and fluorite to the bottom of the ladle, and the addition amount is controlled as lime 3kg / t steel and fluorite 0.5 kg / t steel;

[0085] B. During the tapping process, when the amount of molten steel in the ladle reaches or exceeds 1 / 5, deoxidation and alloying treatment is carried out, that is, composite deoxidizer, silicon-manganese alloy, ferrosilicon, medium-carbon ferrochrome, and ferroniobium are sequentially added to the ladle , vanadium-nitrogen alloy, and when the ladle molten steel amount reaches 3 / 4, add described each alloy, the addition of each alloy is:

[0086] Composite deoxidizer 1.0 kg / t steel,

[0087] Silicon man...

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Abstract

The invention provides a corrosion resisting and shock resisting steel with high strength and a preparation method thereof. The method comprises the following steps of: after carrying out conventional composite top and bottom blowing, slagging and other smelting processes in a steel furnace, adding a compound deoxidizer, a silicon-manganese alloy, silicon iron, medium carbon ferrochromium, ferroniobium and a vanadium-nitrogen alloy to a steel ladle during tapping in sequence; carrying out deoxidation alloying treatment; after softly blowing argon to the molten steel for 4-5 minutes while the tapping is finished, casting the molten steel into a steel blank; after heating the steel blank at 1080-1120 DEG C, controlling open rolling temperature at 960-1010 DEG C to carry out rough rolling and medium rolling; controlling the cooling after the medium rolling is finished and before precision rolling is started; controlling the final rolling temperature at 870-960 DEG C to carry out final rolling; and then rapidly cooling the steel blank by water so that the steel is cooled to 640-680 DEG C; and naturally cooling the steel by air to room temperature so as to obtain the corrosion resisting and shock resisting steel with high strength. According to the invention, the corrosion resistance of the steel is obviously improved, the corrosion rate is only 1 / 5-1 / 4 of the corrosion rate of the400 MPa reinforcing steel bar produced by the traditional process, fine crystal particles, ferrite crystal particles at grade of 9.5-11.5 and excellent mechanical properties of the process are obtained; and the cost of the corrosion resisting and shock resisting steel with high strength is reduced by more than 20 yuan / t while being compared with the cost of the like products.

Description

technical field [0001] The invention relates to a high-strength corrosion-resistant and shock-resistant steel and a preparation method thereof, belonging to the technical field of building steel manufacturing. Background technique [0002] With the rapid development of my country's construction industry, the quality requirements for hot-rolled ribbed steel bars for construction are also getting higher and higher. The hot-rolled ribbed steel bar is the skeleton material of the concrete structure. It bears various stresses in the structure and is sometimes used in a certain corrosive environment. It also requires high functionality, such as shock resistance and corrosion resistance. At present, the problem of premature destruction of reinforced concrete structures due to corrosion of steel bars has attracted widespread attention from all over the world. According to a survey in 1998, there were 575,000 reinforced concrete bridges in the United States, more than half of which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/26B21B37/74
Inventor 赵宇陈伟张卫强庾郁梅李金柱
Owner WUKUN STEEL
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