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HRB500 hot-rolled belt rib antiseismic steel bar and preparation method thereof

A technology for hot-rolled ribbed and earthquake-resistant steel bars is applied in the field of iron and steel smelting, which can solve the problems of unqualified rolling performance, increased low-fold defects of cast slabs, and poor welding performance, and achieves excellent welding performance, low production cost, and dispersion. added effect

Inactive Publication Date: 2014-07-02
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems existing in the prior art, such as the deterioration of welding performance caused by the excessively high carbon equivalent caused by the addition of too much alloy, and the increase of low-magnification defects in the cast slab caused by excessive nitrogen addition, which will cause the steel to roll. Insufficient performance unqualified, provide a HRB500 grade hot-rolled ribbed anti-seismic steel bar and its preparation method, the steel has the advantages of high strength, high toughness, and low manufacturing cost

Method used

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  • HRB500 hot-rolled belt rib antiseismic steel bar and preparation method thereof
  • HRB500 hot-rolled belt rib antiseismic steel bar and preparation method thereof
  • HRB500 hot-rolled belt rib antiseismic steel bar and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Prepare a HRB500 grade hot-rolled ribbed anti-seismic steel bar with a diameter of 12mm. The chemical composition of molten steel is calculated by weight percentage: C: 0.17%, Si: 0.45%, Mn: 1.27%, P: 0.031%, S: 0.024 %, V: 0.029%, N: 0.0087%.

[0022] Its preparation method comprises the following steps in turn:

[0023] The steps of hot metal desulfurization, converter smelting, argon blowing, continuous casting, billet heating, rolling, post-rolling controlled cooling, and cooling bed air cooling, wherein,

[0024] The hot metal desulfurization adopts the magnesium powder desulfurization process, and the sulfur content of the outgoing hot metal is controlled to S≤0.030%, and the desulfurization slag in the tank is cleaned;

[0025] During converter smelting, the loading amount of steel scrap accounts for 10% of the total loading amount; the final slag basicity target is 2.8; the end point C of the converter is controlled at 0.07%; the tapping temperature is 1700°C; ...

Embodiment 2

[0031] A HRB500 grade hot-rolled ribbed anti-seismic steel bar with a diameter of 18 mm was prepared. The chemical composition of molten steel was calculated as follows: C: 0.21%, Si: 0.57%, Mn: 1.36%, P: 0.034%, S: 0.027%, V: 0.033%, N: 0.0095%;

[0032] Its preparation method comprises the following steps in turn:

[0033] The steps of hot metal desulfurization, converter smelting, argon blowing, continuous casting, billet heating, rolling, post-rolling controlled cooling, and cooling bed air cooling, wherein,

[0034] The hot metal desulfurization adopts the magnesium powder desulfurization process, and the sulfur content of the outgoing hot metal is controlled to S≤0.030%, and the desulfurization slag in the tank is cleaned;

[0035] During converter smelting, the amount of steel scrap charged accounts for 12% of the total amount charged; the final slag basicity target is 3.0; the end point C of the converter is controlled at 0.07%; the tapping temperature is 1695°C; the ...

Embodiment 3

[0041] Prepare a HRB500 grade hot-rolled ribbed anti-seismic steel bar with a diameter of 22mm. According to the steel composition requirements, the chemical composition of molten steel is: C: 0.23%, Si: 0.65%, Mn: 1.47%, P: 0.034%, S: 0.021% , V: 0.045%, N: 0.0129%;

[0042] Its preparation method comprises the following steps in turn:

[0043] The steps of hot metal desulfurization, converter smelting, argon blowing, continuous casting, billet heating, rolling, post-rolling controlled cooling, and cooling bed air cooling, wherein:

[0044] The hot metal desulfurization adopts the magnesium powder desulfurization process, and the sulfur content of the outgoing hot metal is controlled to S≤0.030%, and the desulfurization slag in the tank is cleaned;

[0045] During converter smelting, the amount of steel scrap charged accounts for 12% of the total amount charged; the final slag basicity target is 3.0; the end point C of the converter is controlled at 0.07%; the tapping temper...

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Abstract

The invention discloses an HRB500 hot-rolled belt rib antiseismic steel bar and a preparation method thereof. The steel comprises the following chemical components in percentage by weight: 0.17-0.25% of C, 0.4-0.8% of Si, 1.2-1.5% of Mn, at most 0.045% of P, at most 0.045% of S, 0.028-0.045% of V, 0.008-0.014% of N, and the balance of Fe and inevitable impurity elements. The preparation method comprises the following steps: molten iron desulfurization, converter smelting, argon blowing, continuous casting, square billet heating, rolling, controlled cooling after rolling, and cooling bed air cooling. The steel has the advantages of high strength, high toughness and low manufacturing cost. The preparation technique has the advantages of simple process and low production cost.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and specifically refers to a HRB500 grade hot-rolled ribbed anti-seismic steel bar and a preparation method thereof. Background technique [0002] Due to the frequent occurrence of earthquakes and other disasters, especially after the 5.12 Wenchuan earthquake, the seismic performance indicators of steel used in the construction industry have received widespread attention, and high-strength, high-yield ratio seismic steel bars will gradually become the mainstream. At present, the hot-rolled ribbed anti-seismic steel bars produced in the market all increase the yield strength and elongation of the steel bar by adding vanadium-nitrogen alloy. The disadvantages are: vanadium-nitrogen alloy is a composite alloy, and its preparation is complicated and expensive. . Before the present invention, the Chinese patent application number 200910184824.8 disclosed a 500MPa-level large-scale hot...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/60C22C33/04
Inventor 徐志东范植金朱启铭徐志吴杰龙莉周新龙张帆
Owner 武汉钢铁有限公司
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