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Method for Improving Center Density of Steel Continuous Casting Slabs Used in High-Rise Buildings

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

Active Publication Date: 2019-08-09
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 the center density of steel continuous casting billets for high-rise buildings. During the continuous casting process, the casting machine casting speed is controlled to be 0.75m / min ~ 0.90m / min; the solidification end is pressed under heavy pressure; Dynamic secondary cooling control is adopted, while light pressing and heavy pressing are used to press according to the distributed solid phase ratio; the superheat of the molten steel in the tundish is controlled to 20°C to 30°C. This method mainly uses technical measures such as stabilizing the casting machine speed, reducing the superheat of the tundish, dynamic control of secondary cooling, and control under heavy pressure at the solidification end to reduce the center porosity of the high-construction steel cast slab, thereby improving the center density of the cast slab. Improve the internal quality of rolled products. The cast slab produced by this method is better than the existing light reduction technology after implementation. The center density is higher and the overall quality is good, which can well meet the usage requirements of high-grade construction steel.

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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Patent Type & Authority Patents(China)
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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