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Hot-rolled ribbed steel bar having strength-to-yield ratio of 1.25 or more, and production method thereof

A technology of hot-rolled ribbed steel bar and strength-to-yield ratio, which is applied in the field of ribbed steel bar and its production, hot-rolled ribbed anti-seismic steel bar and its production field, can solve the problems of high price, increased production cost, and high production cost, and achieve mechanical Stable performance, reduced dosage, and high strength-to-yield ratio

Inactive Publication Date: 2013-12-25
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 hot-rolled ribbed anti-seismic steel bars produced at present all increase the yield strength and elongation of the steel bars by adding vanadium-nitrogen alloys. The shortcomings are: the country vigorously promotes the policy of high-strength steel bars, resulting in HRB500 produced according to conventional processes. The price of vanadium alloy has soared sharply, and the production cost is too high, which completely crowds out the space of enterprises, which is not conducive to the improvement of competitiveness of enterprises; vanadium nitrogen alloy is a kind of composite alloy, its preparation is complicated, expensive, high production cost, and the production motivation of enterprises is insufficient , the output cannot be scaled; my country's domestic vanadium resource reserves are very limited, and large-scale mining is not conducive to environmental protection and the utilization of valuable resources
Its shortcomings: the process of preparing vanadium alloy of pure vanadium and nitrogen-enhancing agent of pure nitrogen is complex and expensive, which increases the production cost of steel bars, and the enterprise is insufficiently motivated to realize mass production
[0006] Its shortcomings: the use of nitrogen alloys to increase the nitrogen content in steel, and the high alloy content in steel increases production costs, squeezes the profit margins of steel mills, and is not conducive to improving the competitiveness of enterprises

Method used

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  • Hot-rolled ribbed steel bar having strength-to-yield ratio of 1.25 or more, and production method thereof
  • Hot-rolled ribbed steel bar having strength-to-yield ratio of 1.25 or more, and production method thereof
  • Hot-rolled ribbed steel bar having strength-to-yield ratio of 1.25 or more, and production method thereof

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Embodiment Construction

[0035] The present invention is described in detail below:

[0036] Table 1 is the value list of each embodiment of the present invention and comparative examples;

[0037] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;

[0038] Table 3 is a list of the performance tests of the various embodiments of the present invention and comparative examples.

[0039] Each embodiment of the present invention is produced according to the following steps:

[0040] Its steps:

[0041] 1) Desulfurization of molten iron: use magnesium powder desulfurization process, and control the sulfur content of molten iron [S] ≤ 0.010%, and remove the desulfurization slag;

[0042] 2) Carry out compound blowing at the top and bottom of the converter. When the tapping amount reaches 1 / 4 of the total amount of molten steel, add ferrosilicon manganese to the molten steel at a rate of 21-23 kg / ton of steel, and add 1.4-1.6 kg / ton of steel Ferr...

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Abstract

A hot-rolled ribbed steel bar having a strength-to-yield ratio of 1.25 or more comprises 0.17-0.25wt% of C, 0.4-0.8wt% of Si, 1.2-1.5wt% of Mn, 0.045wt% or less of P, 0.045wt% or less of S, 0.05-0.08wt% of V, 0.006-0.018wt% of N, and the balance of Fe and impurity elements, and has a specification diameter of 12-40mm. A production method of the hot-rolled ribbed steel bar comprises the following steps: desulfurizing molten iron; carrying out top-bottom blowing of a converter; carrying out component fine-adjustment at an argon station, and blowing in nitrogen; refining an LF furnace, and blowing nitrogen into the LF furnace; continuously casting; carrying out stacking cooling; heating casted blanks; carrying out rough rolling and finish rolling; and naturally cooling to room temperature. Nitrogen is blown to realize greatly reduced cost, greatly reduced vanadium alloy consumption, increased V (C,N) amount and dispersity with the increase of the content of N in steel, substantial reinforcement effect and stable mechanical performances on the premise that mechanical performances comprising a hot-rolled yield strength of above 530MPa, a strength-to-yield ratio of 1.25-1.30, an A value of 18% or more and an Agt value of 10 or more are guaranteed.

Description

technical field [0001] The invention relates to a steel bar and a production method thereof, in particular to a ribbed steel bar and a production method thereof, and is especially suitable for a hot-rolled ribbed anti-seismic steel bar whose strength-to-yield ratio is improved through vanadium-nitrogen microalloy strengthening technology and a production 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. [0003] The hot-rolled ribbed anti-seismic steel bars produced at present all increase the yield strength and elongation of the steel bars by adding vanadium-nitrogen alloys. The shortcomings are: the country vigorously promotes the policy of high-strength steel ...

Claims

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Application Information

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IPC IPC(8): C22C38/60C22C38/12C22C33/06C21D8/08
Inventor 徐志东范植金徐志吴杰周新龙罗国华张帆丁礼权王瑞敏
Owner 武汉钢铁有限公司
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