CN-122007364-A - Method for eliminating intermediate cracks of oriented silicon steel continuous casting blank

CN122007364ACN 122007364 ACN122007364 ACN 122007364ACN-122007364-A

Abstract

The invention belongs to the technical field of metallurgy, and provides a method for eliminating intermediate cracks of an oriented silicon steel continuous casting blank, which comprises the steps of optimizing a cooling mode of a secondary cooling area of a continuous casting machine, setting a bending section and a fan section nozzle of the continuous casting machine as high-efficiency anti-blocking aerosol nozzles, and periodically tracking, detecting and calibrating a fan section roller row of the continuous casting machine.

Inventors

ZHAO HAIMING
LUO HONGYI
XUE LIQIANG
CHEN YI
LIANG JINGTAO

Assignees

山西太钢不锈钢股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260320

Claims (3)

1.A method for eliminating the middle cracks of an oriented silicon steel continuous casting blank is characterized by comprising the following steps: S1, optimizing a cooling mode of a secondary cooling area of the continuous casting machine: The cooling mode is set to be that the middle part is strong cold and the side part is weak cold, so that the cooling of the foot roller and the bending section part is enhanced; s2, setting a bending section nozzle and a fan-shaped section nozzle of the continuous casting machine as efficient anti-blocking aerosol nozzles; s3, carrying out periodical tracking detection and calibration on a fan-shaped section roller column of the continuous casting machine, wherein the roller gap precision is controlled within +/-0.5 mm.
2. The method for eliminating the intermediate cracks of the oriented silicon steel continuous casting billet according to claim 1, wherein the specific setting in S1 comprises setting secondary cooling specific water quantity of a secondary cooling zone of a continuous casting machine to be 1.4-1.6L/kg, and secondary cooling water quantity of a foot roll zone, a bending zone, an arc zone, a straightening zone and a horizontal zone to be 10-15%, 40-50%, 25-30%, 10-15% and 2-5% respectively, and setting edge water quantity= (0.4-0.6) multiplied by middle water quantity.
3. The method for eliminating the intermediate cracks of the oriented silicon steel continuous casting billet according to claim 1, wherein in the step S3, the fan-shaped section is replaced and disconnected when the point position of the measured roll gap deviation value exceeding +/-0.5 mm reaches 20%, and the roll gap is measured and adjusted before each batch of production.

Description

Method for eliminating intermediate cracks of oriented silicon steel continuous casting blank Technical Field The invention belongs to the technical field of metallurgy, relates to production of high-quality oriented silicon steel, optimizes a continuous casting process of the high-quality oriented silicon steel, and particularly relates to a method for eliminating intermediate cracks of an oriented silicon steel continuous casting blank. Background Oriented silicon steel is an important soft magnetic material mainly used for manufacturing transformer iron cores, and the uniformity of surface quality and internal structure of the oriented silicon steel directly influences the magnetic performance and lamination coefficient of a final product. In the production process, the surface of the hot rolled coil often has a bulge defect, which is shown as local bulge on the surface of the rolled steel plate, and seriously affects the smooth proceeding of the subsequent cold rolling process, the uniformity of the surface coating and the quality of the final product. It was found that the root of the bulging defect of the hot rolled coil tends to be traced back to a crack in the interior of the continuous casting slab. The secondary cooling design distribution is unreasonable, and the casting blank is easier to generate internal defects such as middle cracks when the roll gap precision of the casting machine is poor. These defects cannot be completely welded together in the subsequent hot rolling process, remain in the slab in the form of stress non-uniformity, and finally appear as surface bulges on the hot rolled coil. The existing continuous casting process has defects in the aspects of uniformity of secondary cooling water distribution and equipment precision, and is a key cause for causing the problem of internal quality of casting blanks. Therefore, a method for systematically solving the intermediate cracks of the oriented silicon steel continuous casting billet is urgently needed. Disclosure of Invention The invention aims to provide a method for eliminating the middle cracks of an oriented silicon steel continuous casting blank, which improves the functional precision of key equipment and remarkably improves the internal quality of the casting blank by systematically optimizing a continuous casting two-cooling system. The technical scheme adopted by the invention for achieving the purpose is as follows: a method for eliminating intermediate cracks of an oriented silicon steel continuous casting blank comprises the following steps of S1, optimizing a cooling mode of a secondary cooling area of the continuous casting machine: The cooling mode is set to be that the middle part is strong cold and the side part is weak cold, so that the cooling of the foot roller and the bending section part is enhanced; s2, setting a bending section nozzle and a fan-shaped section nozzle of the continuous casting machine as efficient anti-blocking aerosol nozzles; s3, carrying out periodical tracking detection and calibration on a fan-shaped section roller column of the continuous casting machine, wherein the roller gap precision is controlled within +/-0.5 mm. Further, the specific arrangement in the S1 comprises that the secondary cooling specific water quantity of a secondary cooling zone of the continuous casting machine is 1.4-1.6L/kg, the secondary cooling water quantity of a foot roll zone, a bending section, an arc section, a straightening section and a horizontal section is respectively 10-15%, 40-50%, 25-30%, 10-15% and 2-5%, and meanwhile, the side water quantity= (0.4-0.6) multiplied by the middle water quantity is arranged. Furthermore, the standard sector section is used on line, the sector section is replaced and disconnected when the deviation value of the measured roll gap exceeds +/-0.5 mm and the point position reaches 20%, and the roll gap is measured and adjusted before each batch of production. The beneficial effects of the invention are as follows: the method systematically cooperates with the cooling optimization and the equipment precision improvement to supplement each other, and the differentiated cooling simultaneously gives consideration to the internal quality and the corner quality of the casting blank, and the high-precision equipment reduces the mechanical stress and ensures the stable and uniform solidification of the casting blank in a fragile temperature zone. The method is suitable for a specific production line, is designed aiming at the high alloy characteristics of a broad-width slab casting machine and oriented silicon steel, has specific measures and strong operability, and solves the problem of pain points in the production process of the products. The method disclosed by the invention has the advantages that the comprehensive benefit is improved, the center segregation is improved while the middle crack of the product is eliminated, the surface quality of the hot rolled coil is improved