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600MPa hot-rolled ribbed steel bar and preparation method thereof

A hot-rolled ribbed steel bar and steel bar technology, applied in the field of low-alloy steel production, can solve problems such as difficult large-scale application, affecting the quality of finished products, and high performance requirements of rolling mills, so as to reduce alloy content, reduce production costs, and improve steel bar strength. 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

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Problems solved by technology

However, the finishing rolling of this method adopts low-temperature and large-reduction rolling, which has high requirements on the performance of the rolling mill, and is not suitable for ordinary continuous rolling mills. It is difficult to apply in large quantities at the present stage, and the vanadium-nitrogen alloy is a composite alloy, and its preparation is complicated. The price is expensive, the production cost is high, the production motivation of the enterprise is insufficient, the output cannot be scaled up, and the high N content will easily cause too many bubbles under the skin of the continuous casting slab, which will affect the quality of the finished product

Method used

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  • 600MPa hot-rolled ribbed steel bar and preparation method thereof

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Effect test

Embodiment 1

[0025] Prepare a 600MPa hot-rolled ribbed steel bar with a diameter of 12mm. The chemical composition of molten steel is calculated by weight percentage: C: 0.068%, Si: 0.2%, Mn: 1.45%, P: 0.04%, S: 0.04%, B: 0.0034%, Nb: 0.03%, V: 0.027%, Ti: 0.011, N: 0.005%;

[0026] Its preparation method includes the steps of molten iron desulfurization, converter smelting, nitrogen blowing, continuous casting, billet heating, rolling, controlled cooling, and cooling bed air cooling, wherein,

[0027] The hot metal desulfurization adopts the magnesium powder desulfurization process, and the sulfur content of the outgoing hot metal is controlled to be S≤0.040%, and the desulfurization slag in the tank is cleaned;

[0028] During converter smelting, the amount of steel scrap charged accounts for 10% of the total charge; the converter adopts top-bottom composite blowing, and the end point adopts high-drawing supplementary blowing process; the final slag basicity target is 3.6; the converter ...

Embodiment 2

[0034] Prepare a 600MPa hot-rolled ribbed steel bar with a diameter of 18mm. The chemical composition of molten steel is calculated by weight percentage: C: 0.083%, Si: 0.35%, Mn: 1.36%, P: 0.034%, S: 0.022%, B: 0.0027%, Nb: 0.041%, V: 0.043%, Ti: 0.035, N: 0.0085%;

[0035] The preparation method includes the steps of molten iron desulfurization, converter smelting, nitrogen blowing, continuous casting, billet heating, rolling, controlled cooling, and cooling bed air cooling, wherein:

[0036] The hot metal desulfurization adopts the magnesium powder desulfurization process, and the sulfur content of the outgoing hot metal is controlled to S≤0.040%, and the desulfurization slag in the tank is cleaned

[0037] During converter smelting, the scrap load accounts for 12% of the total load; the converter adopts top-bottom compound blowing, and the end point adopts high-drawing supplementary blowing process; the final slag basicity target is 3.2; the converter end point C control w...

Embodiment 3

[0043] Prepare a 600MPa hot-rolled ribbed steel bar with a diameter of 28mm. The chemical composition of molten steel is calculated by weight percentage: C: 0.13%, Si: 0.41%, Mn: 1.47%, P: 0.032%, S: 0.027%, B: 0.002%, Nb: 0.042%, V: 0.041%, Ti: 0.018, N: 0.005%;

[0044] Its preparation method includes the steps of molten iron desulfurization, converter smelting, nitrogen blowing, continuous casting, billet heating, rolling, controlled cooling, and cooling bed air cooling, wherein,

[0045] The hot metal desulfurization adopts the magnesium powder desulfurization process, and the sulfur content of the outgoing hot metal is controlled to be S≤0.040%, and the desulfurization slag in the tank is cleaned;

[0046] During converter smelting, the amount of steel scrap loaded accounts for 13% of the total amount loaded; the converter adopts top-bottom composite blowing, and the end point adopts a high-drawing supplementary blowing process; the final slag basicity target is 2.8; the ...

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Abstract

The invention provides a 600MPa hot-rolled ribbed steel bar and a preparation method thereof. The steel comprises the following chemical components in percentage by weight: 0.06-0.15% of C, 0.2-0.5% of Si, 1.2-1.6% of Mn, less than or equal to 0.04% of P, less than or equal to 0.04% of S, 0.001-0.04% of B, 0.03-0.05% of Nb, 0.02-0.05% of V, 0.01-0.04% of Ti, 0.005-0.009% of N, and the balance of Fe and inevitable impurities. The preparation method of the 600MPa hot-rolled ribbed steel bar comprises the steps of molten iron desulphurization, converter smelting, nitrogen blowing, continuous casting, square billet heating, rolling, cooling control and cooling bed air-cooling. The steel not only has good comprehensive mechanical properties, but also has better cold bending properties.

Description

technical field [0001] The invention belongs to the technical field of low alloy steel production, and specifically refers to a 600MPa hot-rolled ribbed steel bar and a preparation method thereof. Background technique [0002] With the rapid development of the construction industry, complex structures such as large public buildings and high-rise buildings have higher and higher requirements for the bearing capacity of steel bars, requiring steel bars to have higher strength, toughness, and better weldability. HRB600 high-strength steel bar is the highest level of hot-rolled ribbed steel bar in the current national standard. Compared with the HRB335, HRB400, and HRB500 steel bars currently mainly used, it can save steel consumption by 73.3%, 44.4% and 19.5%, respectively. On the other hand, it can solve the problem of fat beams and columns in the building structure, increase the use area of ​​the building, make the structure design more flexible, improve the use function of t...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
Inventor 徐志东范植金朱启铭徐志吴杰周新龙龙莉张帆
Owner 武汉钢铁有限公司
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