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Titaniferous carbon steel and production method thereof

A technology of titanium carbon and molten steel, applied in the field of steel rolling, can solve the problems of fluctuating and inaccurate strength of finished steel products

Active Publication Date: 2019-05-03
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, since Ti is easy to react with O, N, and S in molten steel, in the case of inaccurate control of O, N, and S in molten steel, the remaining effective Ti in molten steel after Ti reacts with O, N, and S The content is not accurate, and the fine dispersed TiC particles precipitated by the reaction of effective Ti and C during the rolling and post-rolling cooling process of titanium-containing carbon steel play a major role in precipitation strengthening. If the effective Ti content is not controlled accurately, it will cause Significant strength fluctuations in finished steel

Method used

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  • Titaniferous carbon steel and production method thereof
  • Titaniferous carbon steel and production method thereof
  • Titaniferous carbon steel and production method thereof

Examples

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Effect test

Embodiment 1

[0078] Titanium-containing carbon structural steel with the brand name Q235B, a hot-rolled steel strip and a preparation method thereof. This type of steel only uses carbon and titanium to strengthen the steel, and does not add silicon-based and manganese-based alloys.

[0079] The preparation method of the titanium-containing carbon hot-rolled steel strip of brand Q235B specifically comprises the following steps:

[0080] (1) Hot metal pretreatment: carry out deep desulfurization operation, control S in hot metal ≤ 0.01%, and remove desulfurization slag.

[0081] (2) The molten iron after pretreatment enters the converter. In the middle and later stages of smelting, the bottom blowing gas is switched from nitrogen to argon, and the P in the tapping molten steel is controlled to be 0.016%, and the C is 0.12%. The content is less than 20ppm.

[0082] Control the temperature of the tapping molten steel to prevent the peroxidation of the molten steel; maintain the shape of the ...

Embodiment 2

[0101] The grade is Q275B titanium-containing hot-rolled steel strip (Q275B-Ti) and its production method. This steel type only uses carbon and titanium to strengthen the steel, and does not add silicon-based and manganese-based alloys.

[0102] Concrete preparation method comprises the following steps:

[0103] (1) Deep desulfurization operation is carried out in the molten iron pretreatment link, and the S in the molten iron is controlled to be less than or equal to 0.01%, and the desulfurization slag is completely removed.

[0104] (2) The molten iron after pretreatment enters the converter. In the middle and late stages of converter smelting, the bottom blowing gas is switched from nitrogen to argon, and the P in the tapping molten steel is controlled to be 0.015%, and the C in the tapping molten steel is 0.10%, so as to prevent overoxidation of the molten steel. The temperature of the tapping molten steel is 1640°C, maintain the shape of the tapping hole, make the tapping...

Embodiment 3

[0120] A titanium-containing carbon structural steel (Q345B-Ti) hot-rolled steel strip with the brand name Q345B and a production method thereof. This type of steel only uses carbon and titanium to strengthen the steel, and does not add silicon-based and manganese-based alloys.

[0121] Concrete preparation method comprises the following steps:

[0122] (1) Deep desulfurization operation is carried out in the molten iron pretreatment link, and the S in the molten iron is controlled to be less than or equal to 0.01, and the desulfurization slag is pulled out to remove the desulfurization slag.

[0123] (2) The molten iron after pretreatment enters the converter. In the middle and late stages of converter smelting, the bottom blowing gas is switched from nitrogen to argon, and the P in the tapping molten steel is controlled to be 0.014%, and the C in the tapping molten steel is 0.08%, so as to prevent overoxidation of the molten steel. The temperature of the tapping molten stee...

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Abstract

The invention discloses titaniferous carbon steel and a production method thereof. The titaniferous carbon steel comprises, by weight, 0.09%-0.20% of C, 0.02%-0.11% of Ti, 0.02%-0.06% of Alt and the balance Fe and inevitable impurities, wherein Alt shows total aluminum. According to the produced titaniferous carbon steel, Si and Mn are completely replaced with titanium, and cost is saved under thecondition of enhancing the strength of steel. The invention further provides a smelting process for precisely controlling the contents of O, N and S in molten steel and a rolling and after-rolling cooling process for controlling TiC particle fine dispersion precipitation. The effective Ti content in the molten steel can be stably controlled, precipitated TiC particles are large in number and small in size, and therefore the effect of stably improving the strength of the steel is achieved, and steel strength fluctuation caused by non-precise control of the smelting and rolling processes is avoided.

Description

technical field [0001] The invention belongs to the field of steel rolling in iron and steel metallurgy technology, in particular, the invention relates to a titanium-containing carbon steel and a production method thereof. Background technique [0002] The role of Ti in steel is mainly reflected in the following aspects: Ti can combine with N to form a stable nitride, which can refine the grain and improve the welding performance of the material; Ti can change the sulfide in steel , make the sulfide spheroidize, improve the difference in the vertical and horizontal properties of the material and the cold forming performance; when the Ti content is high (≥0.03wt%), combined with a suitable thermal processing process, it can form dispersed and fine TiC, which plays a role in precipitation strengthening On the basis of ordinary carbon steel, improving the performance of materials is of great significance for improving the competitiveness of my country's iron and steel industry. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/06C22C38/02C22C38/04C21C7/06C21C7/00C21C5/34C21D8/02
Inventor 赵燕刘洪银周宪海王利
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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