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Titanium microalloyed 500-MPa high-strength steel bar and production method thereof

A high-strength steel bar and micro-alloying technology, applied in the field of iron and steel metallurgy micro-alloying, can solve the problems of high production cost, resource shortage, and occupation of profit space, so as to improve yield strength and tensile strength, reduce phase transition temperature, Effect of grain size refinement

Active Publication Date: 2012-10-03
PANZHIHUA GANGCHENG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production cost of vanadium and its alloys, niobium and its alloys is relatively high, which not only squeezes the profit margin of enterprises, but also causes a shortage of vanadium and niobium resources, which is not conducive to the production and application of 500MPa high-strength steel bars and earthquake-resistant steel bars.
[0004] The Panxi area is rich in vanadium and titanium resources. The use of vanadium to strengthen steel bars by micro-alloy carbonitride precipitation has been widely used, and the use of micro-titanium treatment to refine the austenite grains of steel bars has also been applied, but the use of titanium to strengthen steel bars has been widely used. Precipitation strengthening of microalloyed carbonitrides has not been reported

Method used

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  • Titanium microalloyed 500-MPa high-strength steel bar and production method thereof
  • Titanium microalloyed 500-MPa high-strength steel bar and production method thereof
  • Titanium microalloyed 500-MPa high-strength steel bar and production method thereof

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preparation example Construction

[0033] The preparation method of the above-mentioned titanium microalloyed 500MPa grade high-strength steel bar comprises the following steps:

[0034] a. Smelt steelmaking raw materials into crude steel liquid, tap steel, and carry out deoxidation and alloying during the tapping process;

[0035] b. The molten steel after tapping is sent to the refining furnace for refining and composition fine-tuning, so that it meets the requirements of the steel bar composition and then casts to obtain a billet for rolling steel bars;

[0036]c. Heat the rolled steel billet to 1100-1250°C and keep it warm for 30-150 minutes, then roll it, and finish rolling when it reaches 750-950°C, and air-cool the rolled steel bar to room temperature to obtain titanium micro Alloyed 500MPa high-strength steel bars;

[0037] Among them, alloying of titanium is performed during tapping and after deoxidation, or during refining.

[0038] The invention strictly controls the heating temperature and holding...

Embodiment 1

[0047] (1) Using slag iron as raw material to produce HRB500 steel bars, smelting into crude molten steel through slagging, oxygen blowing and other measures through electric furnace, the crude molten steel contains [C]0.20%, [P]0.022%, [S]0.093% , [N]68ppm, a[o]70ppm, temperature 1693°C, and then tapping, deoxidation alloying in the tapping process, titanium is added in the form of bulk Ti-25wt%Si-10wt%Fe master alloy with a particle size of 25mm , The molten steel after deoxidation and alloying is sent to LF furnace for refining and composition fine-tuning, and the obtained molten steel is sent to billet continuous casting, and the composition is shown in Table 1.

[0048] (2) Heat the billet to 1200°C for 1 hour.

[0049] (3) Air-cool or water-cool the above-mentioned heated slab to 1050°C, and then carry out rolling, and the final rolling temperature is 850°C.

[0050] (4) Air-cool the hot-rolled steel bars to room temperature.

Embodiment 2

[0052] (1) Using slag steel as raw material to produce HRB500, through slag making, oxygen blowing and other measures, it is smelted into crude molten steel through electric furnace. Crude molten steel contains [C]0.21%, [P]0.022%, [S]0.067%, [ N]60ppm, a[o]55ppm, temperature 1683°C, composition and temperature meet the specified requirements, then tapping, deoxidation alloying is carried out during the tapping process, titanium is added in the form of Ti-45wt%Si-10wt%Fe cored wire , The molten steel after deoxidation and alloying is sent to LF furnace for refining and composition fine-tuning, and the obtained molten steel is sent to billet continuous casting, and the composition is shown in Table 1.

[0053] (2) Heat the billet to 1230°C for 1 hour.

[0054] (3) Air-cool or water-cool the above-mentioned heated slab to 1050°C, and then carry out rolling, and the final rolling temperature is 850°C.

[0055] (4) Air-cool the hot-rolled steel bars to room temperature.

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Abstract

The invention discloses a 500-MPa high-strength steel bar for reinforced concrete and a production method thereof, belonging to the technical field of microalloying in ferrous metallurgy. The steel in the steel bar comprises the following chemical components in percentage by weight: 0.18-0.25% of C, 0.20-0.80% of Si, 1.20-1.50% of Mn, 0.06-0.12% of Ti, at most 0.01% of N, at most 0.045% of S, at most 0.045% of P, and the balance of Fe and inevitable impurities. The preparation method of the steel bar comprises the following steps: a. crude smelting, tapping, deoxidizing and alloying; b. refining and composition fine adjustment, and casting after satisfying the steel bar composition requirement; and c. hot rolling; wherein the titanium is alloyed in the tapping process after deoxidizing or in the refining process. By using the principle that the titanium in steel reinforces the precipitation, the invention enhances the mechanical properties of the steel, and satisfies the performance requirements for 500-MPa high-strength steel bars and even anti-seismic steel bars.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy microalloying, and in particular relates to a hot-rolled 400MPa high-strength steel bar for reinforced concrete and a production method thereof. Background technique [0002] At present, my country is in a period of rapid industrialization and urbanization, and the construction industry is developing rapidly to large-scale. The construction industry is developing toward large scale. In order to improve the safety of large buildings, the construction industry at home and abroad generally uses high-strength, high-weldability hot-rolled ribbed steel bars instead of ordinary steel bars. In addition, with the introduction of policies to promote the use of high-strength steel bars in my country, low-strength steel bars below 335 MPa such as HRB335 will be gradually eliminated, and hot-rolled ribbed steel bars of HRB400 and above levels will be vigorously developed. The newly revised na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/60C21D8/08
Inventor 敖进清雍岐龙许立志杨勇汪波孙新军李昭东
Owner PANZHIHUA GANGCHENG GROUP
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