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Method for improving center segregation of extra thick slab with thickness of 400mm

A technology for extra-thick slab and segregation, applied in the field of improving center segregation of 400mm extra-thick slab

Active Publication Date: 2014-01-29
SHOUGANG CORPORATION
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  • Application Information

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Problems solved by technology

In the production of 400mm extra-thick slabs, there are still obvious segregation zones in the central part. It is necessary to use dynamic soft reduction technology to reduce the degree of segregation. At present, there is no reference for high-quality extra-thick slabs with this thickness specification in China. experience

Method used

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  • Method for improving center segregation of extra thick slab with thickness of 400mm
  • Method for improving center segregation of extra thick slab with thickness of 400mm
  • Method for improving center segregation of extra thick slab with thickness of 400mm

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Embodiment Construction

[0011] figure 1 Schematic diagram of chip removal for drilling. The drilling sampling method is to use a drill bit with a diameter of 8 mm to take 5, 10 and 5 steel shavings at the thickness 1 / 2 and 1 / 4 of the slab width 1 / 4, 1 / 2 and 3 / 4, respectively. C, S chemical analysis, the C and S segregation ratios of the two light reduction schemes were obtained respectively.

[0012] (1) For medium carbon steel with a thickness specification of 400mm, taking Q345DH as an example, two sets of light reduction test schemes are designed. The slab section size is 400×2400mm. Table 1 shows the soft reduction parameters of different schemes, and Table 2 shows the test furnace The average composition of times. figure 2 , image 3 In order to adopt different light reduction schemes, the low-magnification photos of acid leaching of extra-thick slabs were observed by naked eyes, and it was found that the segregation of scheme 2 was better, and there was no obvious segregation zone in the ce...

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Abstract

The invention relates to a method for improving center segregation of an extra thick slab with a thickness of 400mm, and belongs to the technical field of continuous casting of steelmaking. Degree of the center segregation of the extra thick slab with the thickness of 400mm is improved by a dynamic soft reduction technology, so that rating of the center segregation is free from above C2.0 so as to improve the inner quality of the extra thick slab. The specific steps are as follows: determining an optimal reduction position and an optimal rolling reduction: after determining the optimal reduction position, testing different rolling reductions in the reduction area: 5-6mm and 6-8mm and applying a certain rolling reduction of 0-0.5mm to a solid phase area; and combining lower power rating and C, S segregation ratios to determine the optimal rolling reduction.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and continuous casting, and in particular provides a method for improving the central segregation of a 400mm extra-thick slab. Background technique [0002] The causes and hazards of central segregation in medium-thick slabs have been elaborated in detail in many documents: it is believed that columnar crystals "solidification bridge" and slab belly are the main reasons for the formation of central segregation, which can be effectively controlled by using dynamic soft reduction technology Center segregation of cast slabs; however, there are few studies on dynamic soft reduction technology for extra-thick slabs over 400mm. In the production of 400mm extra-thick slabs, there are still obvious segregation zones in the central part. It is necessary to use dynamic soft reduction technology to reduce the degree of segregation. At present, there is no reference for high-quality extra-thick slabs with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/12B22D11/16
Inventor 甄新刚朱志远蒋海涛李景光王玉龙白占禄宋征赵晶孙博
Owner SHOUGANG CORPORATION
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