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Process method for reducing the center segregation of billet

A process method and casting slab technology, applied in the direction of manufacturing converters, etc., can solve the problem of not being able to meet the quality requirements of high-quality, high value-added steel grades, the effect of center segregation control and mitigation is limited, and the centerline segregation of the casting slab can only be reduced but not completely Eliminate other problems, achieve the effect of reducing molten steel inclusions, improving the purity of molten steel, and compacting the central solidified structure

Active Publication Date: 2021-07-09
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, as long as there is solidification, there will be segregation, and the segregation of the billet centerline can only be reduced but not completely eliminated.
At present, billet soft reduction technology is one of the effective measures to control and alleviate this defect, but this technology has limited effect on the control and mitigation of center segregation, and cannot meet many high-quality, high-value-added products that have special requirements for center segregation. The quality requirements of steel grades, so how to effectively control the slab center segregation to meet the quality requirements of steel grades has always been a common problem in continuous casting at home and abroad

Method used

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  • Process method for reducing the center segregation of billet

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Embodiment 1

[0022] Embodiment 1: see figure 1 , figure 2 , a process method for reducing slab center segregation, said method comprising the following steps:

[0023] 1) Purity of molten steel and control of inclusions in steel;

[0024] According to the cavity suction theory in the core of the slab: at the end of the solidification of the slab, the liquid phase changes into a solid phase, the volume shrinks, and a certain cavity is generated in the central area of ​​the slab; the bulging of the slab causes the cavity in the core With negative pressure, the molten steel enriched with solute elements between dendrites is sucked into the core, resulting in central segregation. In addition, due to the different solubility of solute elements in liquid and solid state, segregation occurs during the solidification process. Segregation is an inevitable phenomenon in the solidification process, but the degree of segregation can be controlled by improving equipment and processes.

[0025] The...

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Abstract

The invention relates to a process method for reducing slab center segregation. The method comprises the following steps: 1) controlling the purity of molten steel and inclusions in the steel; 2) pressing down the bulge of the front billet shell and controlling the large frontal reduction; This method mainly adopts the technique of letting the slab bulge first and then lightly reduces the technology to improve the effect of the light reduction technology; through the control of molten steel inclusions, the impurity elements selected for crystallization during the solidification of molten steel are reduced from the source, without adding any equipment and processes steps to meet the requirements of high-quality steel grades.

Description

technical field [0001] The invention relates to a method, in particular to a process method for reducing slab center segregation, and belongs to the technical field of metallurgical continuous casting. Background technique [0002] Center segregation is one of the main defects of continuous casting slab, which seriously affects the properties of steel, such as welding performance, drawing performance and so on. For example, there are often center segregation defects in high-carbon steel billets used to roll high-performance wire rods and oil pipelines. Even through rolling or forging in the subsequent steps, it is difficult to eliminate its adverse effects on the performance of the final product, resulting in product mechanics. Performance deteriorates. Therefore, the central segregation defect is a technical problem to improve the quality of high carbon steel and alloy steel continuous casting slabs in actual production, which limits the development and application of some...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/06C21C7/064B22D11/18B22D11/12
CPCB22D11/1206B22D11/18C21C5/28C21C7/06C21C7/064
Inventor 汪洪峰
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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