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Method for improving center density of continuous cast slabs of high-level building steel

A technology of center density and high-rise buildings, applied in the field of continuous casting, to achieve the effect of high center density, meeting the requirements for use, and improving the center density

Active Publication Date: 2017-08-22
TANGSHAN IRON & STEEL GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is mainly aimed at large-section heavy rail steel, which has certain benefits for the improvement of heavy rail steel quality, and does not propose technical measures for the center density of wide and thick slabs or low-alloy high-strength structural steel wide and thick slabs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: The method for improving the central density of steel continuous casting slabs for high-rise buildings adopts the following process.

[0016] Continuous casting produces Q460GJC high-rise steel with a cross-sectional size of 1800mm×260mm. The casting speed of the casting machine is 0.88m / min, and the casting speed is kept stable. Steel type and casting speed to dynamically adjust the water distribution in each secondary cooling zone. At the same time, the reduction is carried out according to the distribution of solid phase ratio under light reduction and heavy pressure, and the reduction starts from fs=0.9 under heavy pressure; the heavy reduction control at the end of solidification is adopted, and the reduction rate is 0.03mm / s. The section length is 10m; the total reduction is 28.89mm, the reduction of 8-stage light reduction is 0.14mm, the reduction of 9-stage light reduction is 2.59mm, the reduction of 10-stage light reduction is 4.50mm, and the redu...

Embodiment 2

[0018] Embodiment 2: The method for improving the central density of steel continuous casting slabs for high-rise buildings adopts the following process.

[0019] Continuous casting produces Q460GJC high-grade steel with a cross-sectional size of 1800mm×265mm. The casting speed of the casting machine is 0.87m / min, and the casting speed is kept stable. The superheat of molten steel in the tundish is 20℃; the dynamic secondary cooling control technology is adopted, Steel type and casting speed to dynamically adjust the water distribution in each secondary cooling zone. At the same time, the reduction is carried out according to the distribution of solid phase ratio under light reduction and heavy pressure, and the reduction starts from fs=0.9 under heavy pressure; the heavy reduction control at the end of solidification is adopted, and the reduction rate is 0.03mm / s. The interval length is 8m; the total reduction is 23.90mm, the reduction under the 8-stage light reduction is 1.7...

Embodiment 3

[0021] Embodiment 3: The method for improving the central density of steel continuous casting slabs for high-rise buildings adopts the following process.

[0022] Continuous casting produces Q460GJC high-rise steel with a cross-sectional size of 1800mm×265mm. The casting speed of the casting machine is 0.75m / min, and the casting speed is kept stable. The superheat of molten steel in the tundish is 30℃; the dynamic secondary cooling control technology is adopted, Steel type and casting speed to dynamically adjust the water distribution in each secondary cooling zone. At the same time, the reduction is carried out according to the distribution of solid phase ratio under light reduction and heavy pressure, and the reduction starts from fs=0.9 under heavy pressure; the heavy reduction control at the end of solidification is adopted, and the reduction rate is 0.03mm / s. The interval length is 8m, and the total reduction is 23.90mm; the reduction under the 8-stage light reduction is ...

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Abstract

The invention discloses a method for improving center density of continuous cast slabs of high-level building steel. In the continuous casting process, the drawing speed of a casting machine is controlled to be 0.75 m / min-0.90 m / min; solidification tail end heavy reduction is adopted; dynamic secondary cooling control is adopted, and meanwhile, soft reduction and heavy reduction are adopted for carrying out reduction according to the distribution solid phase rate; and the superheat degree of tundish molten steel is controlled to range from 20 DEG C to 30 DEG C. According to the method, technical measures of stabilizing the drawing speed of the casting machine, reducing the superheat degree of tundish, carrying out secondary cooling dynamic control, carrying out solidification tail end heavy reduction control and the like are mainly applied comprehensively to reduce center porosity of the cast slabs of the high-building steel, then the center density of the cast slabs is improved, and internal quality of rolled materials is improved. For the cast slabs produced through the method, after implementation is carried out, the effect is better than that of an existing soft reduction technology, the center density is higher, the overall quality is better, and the use requirement of the high-building steel can be met better.

Description

technical field [0001] The invention relates to a continuous casting method, in particular to a method for improving the central density of steel continuous casting slabs for high-rise buildings. Background technique [0002] Steel for high-rise buildings is referred to as high-rise steel for short. It has properties such as earthquake resistance, high toughness, and low-temperature impact resistance. It is mainly used in large-scale construction projects such as high-rise buildings, airports, and steel structure factories. Q460GJC steel is one of them. Gaojian steel has to bear the complex stress, impact toughness and lamellar tear resistance of high-rise buildings, so it has very strict requirements on the quality of cast slabs and rolled products, especially the central density of cast slabs and rolled products must be ensured to reduce The center is loose, otherwise it will be difficult to guarantee the safety and quality of Gaojian Steel. Therefore, eliminating the loo...

Claims

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Application Information

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IPC IPC(8): B22D11/22B22D11/20B22D11/12
CPCB22D11/1206B22D11/20B22D11/225
Inventor 王云阁王重君刘志远张洪波朱苗勇祭程尹绍江申德刚邓世民程巨广
Owner TANGSHAN IRON & STEEL GROUP
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