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Method for reducing rotten edge defects of q355b steel coil in thin slab continuous casting and rolling production line

A Q355B, thin slab continuous casting technology, applied in the field of structural steel manufacturing, can solve the problems of high occurrence rate, achieve the effect of solving quality problems, improving the ability to resist risks, and increasing the thickness of the slab shell

Active Publication Date: 2022-03-01
湖南华菱涟源钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for reducing the rotten edge defects of Q355B steel coils in the thin slab continuous casting and rolling production line, aiming to solve the technical problem of high incidence of rotten edge defects in Q355B steel coils in the prior art

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  • Method for reducing rotten edge defects of q355b steel coil in thin slab continuous casting and rolling production line
  • Method for reducing rotten edge defects of q355b steel coil in thin slab continuous casting and rolling production line

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Embodiment 1

[0069] The present embodiment provides a method for reducing edge defects of high-titanium Q355B steel coils in a thin slab continuous casting and rolling production line, wherein the chemical components of high-titanium Q355B include: C 0.2%, Si 0.2%, Mn 0.55%, P 0.03 %, S 0.01%, Als 0.012%, Ti 0.035%, the rest are Fe and inevitable impurities;

[0070] The above method includes the following steps:

[0071] The molten steel was subjected to thin slab continuous casting, the superheat degree was 30 °C, and the pulling speed was 3.8 m / min. During the thin slab continuous casting process, the molten steel was put into the secondary cooling zone, and the secondary cooling curves in Table 1 and Table 2 were used respectively. Vibration curve parameters, using mold flux with melting point of 1050℃, basicity of 1.15, viscosity of 0.105Pa·S, and thickness of mold copper plate of 15mm;

[0072] Determine the secondary cooling correction factor: when the width of the high titanium se...

Embodiment 2

[0074] This embodiment provides a method for reducing edge defects of high-titanium Q355B steel coils in a thin slab continuous casting and rolling production line, wherein the chemical components of high-titanium Q355B include: C 0.175%, Si 0.08%, Mn 0.55%, P 0.01 %, S 0.005%, Als 0.04%, Ti 0.05%, the rest are Fe and inevitable impurities;

[0075] The above method includes the following steps:

[0076] The molten steel was subjected to thin slab continuous casting, the superheat degree was 15 °C, and the pulling speed was 4.5 m / min. During the thin slab continuous casting process, the molten steel was put into the secondary cooling zone, and the secondary cooling curves and Vibration curve parameters, using mold flux with melting point of 1150℃, basicity of 1.05, viscosity of 0.075Pa·S, and thickness of mold copper plate of 20mm;

[0077] Determine the secondary cooling correction factor: when the width of the high titanium series Q355B product is 1250mm, the secondary cool...

Embodiment 3

[0079] This embodiment provides a method for reducing edge defects of high-titanium Q355B steel coils in a thin slab continuous casting and rolling production line, wherein the chemical components of high-titanium Q355B include: C 0.18%, Si 0.1%, Mn 0.65%, P 0.02 %, S 0.008%, Als 0.035%, Ti 0.045%, the rest are Fe and inevitable impurities;

[0080] The above method includes the following steps:

[0081] The molten steel was subjected to thin slab continuous casting, the superheat degree was 45 °C, and the pulling speed was 4.0 m / min. During the thin slab continuous casting process, the molten steel was put into the secondary cooling zone, and the secondary cooling curves in Table 1 and Table 2 were used respectively. Vibration curve parameters, using mold flux with melting point of 1100℃, basicity of 1.10, viscosity of 0.01Pa·S, and thickness of mold copper plate of 25mm;

[0082] Determine the secondary cooling correction factor: when the width of the high titanium series Q...

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Abstract

The invention provides a method for reducing the rotten edge defects of Q355B steel coils in the thin slab continuous casting and rolling production line, comprising the following steps: determining the secondary cooling curve according to the steel type and casting speed; the casting speed is 3.8-4.5m / min; Thin slab continuous casting is carried out on the molten steel, and the secondary cooling modification coefficient in the secondary cooling curve is set according to at least one of the thickness of the mold copper plate, the titanium content of the steel, the degree of superheat, the section width of the steel, and the content of acid-soluble aluminum in the steel. The method for reducing the rotten edge defects of Q355B steel coils in the thin slab continuous casting and rolling production line provided by the present invention combines the precipitation mechanism of TiN in Ti-containing steel types, and adjusts the continuous casting process according to the relationship between the thickness of the mold copper plate and the Ti content in molten steel. The secondary cooling correction coefficient can increase the shell thickness of the slab surface layer and control the size of smaller grains and TiN precipitates, improve the anti-risk ability of slab cracks, and effectively solve the quality problem of rotten edge defects of Q355B steel coils.

Description

technical field [0001] The invention belongs to the technical field of structural steel manufacturing, and particularly relates to a method for reducing edge rotten defects of Q355B steel coils in a thin slab continuous casting and rolling production line. Background technique [0002] Q355B is a low-alloy high-strength structural steel, which is widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment, etc. At present, most steel mills use the production process of adding Ti instead of Mn to strengthen the production of Q355B steel. The process route is: molten iron - converter - LF refining - continuous casting - soaking furnace - seven-stand rolling mill - coiling - storage. However, the existing thin slab continuous casting process to produce Q355B has the technical problem of a high incidence of steel coil rotten edge defects, and the overall quality of the obtained Q355B is poor. SUMMARY OF THE INVENTION [0003] The purpose of the pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/124B22D11/22
CPCB22D11/124B22D11/225
Inventor 戴智才徐刚军张尊干聂嫦平
Owner 湖南华菱涟源钢铁有限公司
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