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Method of improving center segregation quality of hypo-peritectic steel casting slabs

A peritectic and steel casting technology, which is applied in the field of slab continuous steel casting, can solve problems such as large process fluctuations, and achieve the effects of improving the segregation quality of the casting slab center, fast flow speed, and accelerating superheating

Inactive Publication Date: 2019-06-28
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the disadvantages of large fluctuations in the existing process for solving the problem of central segregation of hypoperitectic steel slabs, and provide a method for improving the quality of central segregation of hypoperitectic steel slabs

Method used

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  • Method of improving center segregation quality of hypo-peritectic steel casting slabs

Examples

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Effect test

Embodiment 1

[0040] A method for improving the center segregation quality of sub-peritectic steel slabs is applied to produce sub-peritectic steel slabs with a thickness of 230 mm, a carbon content of 0.12%, and a casting speed of 1.2 m / min. The specific process is as follows:

[0041] Ⅰ, such as figure 1 As shown, two pairs of electromagnetic stirring rollers are installed in the second cold zone behind the mold 1 of the slab continuous casting machine:

[0042] A. The first pair of electromagnetic stirring rollers 3 is installed at a vertical distance d1 of 4.5m from the meniscus 2 of the mold, the current is 250A, and the frequency is 3Hz; the second pair of electromagnetic stirring rollers 4 is installed at the distance from the meniscus 2 of the mold The vertical distance d2 is 7.2m, the current is 350A, and the frequency is 4Hz;

[0043] B. The "three-ring" arrangement is adopted between the two pairs of electromagnetic stirring rollers to make the molten steel flow pattern like figure 2 ...

Embodiment 2

[0048] In this embodiment, a method for improving the quality of center segregation of sub-peritectic steel slab is different and improved from embodiment 1 in that it is applied to a production thickness of 250mm, a carbon content of 0.17%, and a casting speed of 0.8m. / min sub-peritectic steel casting billet, the specific process is as follows:

[0049] Ⅰ, such as figure 1 As shown, two pairs of electromagnetic stirring rollers are installed in the second cold zone behind the mold 1 of the slab continuous casting machine:

[0050] A. The first pair of electromagnetic stirring rollers 3 is installed at a vertical distance d1 of 3.5m from the meniscus 2 of the mold, the current is 200A, and the frequency is 4Hz; the second pair of electromagnetic stirring rollers 4 is installed at the distance from the meniscus of the mold 2 The vertical distance d2 is 8m, the current is 300A, and the frequency is 5Hz;

[0051] B. The "three-ring" arrangement is adopted between the two pairs of elec...

Embodiment 3

[0056] In this embodiment, a method for improving the center segregation quality of sub-peritectic steel slabs is different and improved from Embodiments 1 and 2 in that it is applied to a production thickness of 210 mm, a carbon content of 0.06%, and a casting speed of 1.6m / min sub-peritectic steel casting billet, the specific process is as follows:

[0057] Ⅰ, such as figure 1 As shown, two pairs of electromagnetic stirring rollers are installed in the second cold zone behind the mold 1 of the slab continuous casting machine:

[0058] A. The first pair of electromagnetic stirring rollers 3 is installed at a vertical distance d1 of 4m from the meniscus 2 of the mold, the current is 300A, and the frequency is 2Hz; the second pair of electromagnetic stirring rollers 4 is installed perpendicular to the meniscus 2 of the mold The distance d2 is 7m, the current is 400A, and the frequency is 3Hz;

[0059] B. The "three-ring" arrangement is adopted between the two pairs of electromagnetic...

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Abstract

The invention discloses a method of improving center segregation quality of hypo-peritectic steel casting slabs, and belongs to the technical field of slab continuous casting. According to the method,two pairs of electromagnetic stirring rollers are arranged in a secondary cooling zone, and the two pairs of electromagnetic stirring rollers are installed at corresponding positions 3.5 to 8 m perpendicular distance from a crystallizer meniscus; the two pairs of electromagnetic stirring rollers are arranged in a three-ring manner; magnetic field directions generated by the electromagnetic stirring rollers are changed at intervals of 15 seconds; the current of the first pair of electromagnetic stirring rollers is 200 to 300 A, and the frequency is 2 to 4 Hz; the current of the second pair ofelectromagnetic stirring rollers is 300 to 400 A, and the frequency is 3 to 5 Hz; and meanwhile, the dynamic soft reduction technology is employed for processing nearby a solidification end point, thereduction interval of dynamic soft reduction is arranged at a position that the solid fraction of each casting slab is 10 % to 80 %, the reduction rate is 0.8 to 1.5 mm / m, and the total reduction amount is 4.0 to 5.5 mm. The method disclosed by the invention is capable of stably controlling center segregation of the hypo-peritectic steel casting slabs to be C 0.5 to C 1.5; hot charge rolling is realized on all the hypo-peritectic steel casting slabs; and tensile layering and rupturing of hot-rolled coils (plates) is eliminated.

Description

Technical field [0001] The invention relates to the technical field of slab continuous casting steel in the metallurgical industry, in particular to a method for improving the quality of the center segregation of sub-peritectic steel casting slabs. Background technique [0002] With the diversification of slab continuous casting production varieties and the improvement of the quality requirements of cast slabs, the quality of sub-peritectic slab cast slab center segregation has become one of the quality issues of increasing concern; due to the strong surface of sub-peritectic steel Crack sensitivity restricts the use of related processes that help improve the quality of central segregation on sub-peritectic steel; the quality of central segregation directly affects the properties of the finished steel, such as tensile cracking or delamination in the fracture of the tensile specimen of the steel plate; drop of pipeline steel Hammer performance is not satisfactory; therefore, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/115B22D11/12
Inventor 朱伦才刘启龙司小明王志政曹成虎罗霄
Owner MAANSHAN IRON & STEEL CO LTD
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