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

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...

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