A method for on-line verification of the opening degree of the fan-shaped segment under light reduction for wide and thick plate continuous casting machine

Abstract

The invention belongs to the field of wide and thick plate continuous casting machine soft-reduction process in steel production, and particularly relates to an on-line calibration method for the opening of a wide and thick plate continuous casting machine soft-reduction segment. The on-line calibration method is mainly characterized by including the steps: pressing both an inlet and an outlet of the segment to the mechanical lowest position; measuring the actual opening of the segment; comparing the opening; determining a calibration value; calibrating the opening in an on-line manner; and calibrating the opening again. The on-line calibration method has the advantages that by the aid of the on-line calibration method for the opening of the segment, the opening of the segment can be accurately calibrated, a preset soft-reduction scheme can be accurately implemented to obviously improve the low power quality of a casting blank, the rate of blank samples with deviation within 0.5mm from a set roll gap can reach 100%, the rate of blank samples without deviation from the set roll gap can reach 87.60%, center line shrinkage and middle cracks are eliminated, and center segregation and center porosity are decreased.

Description

technical field [0001] The invention belongs to the field of soft reduction process of wide and thick plate continuous casting machine in iron and steel production, and more specifically relates to an online verification method for the opening degree of soft reduction sector of wide and thick plate continuous casting machine. Background technique [0002] The main width and thickness of the plate continuous casting machine should be poured with medium and low carbon high-quality alloy steel, which is used to roll high-strength steel, container steel, pipeline steel, wear-resistant steel, marine steel, double-resistant steel and other steels that have strict requirements on internal quality and compression ratio. kind. Due to the large section size of the slab of the wide and thick slab continuous caster and the long time for the slab to completely solidify, the slab is more likely to have internal defects such as center segregation, center porosity, and shrinkage cavity. Ce...

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Problems solved by technology

[0004] There are few published research reports on the calibration of the opening degree, and most of them are aimed at the research on the roll gap calibration of rolling mills. There are fewer relevant continuous casting machines, and most of them are continuous casting machine roll gap measurement equipment, as disclosed in CN2183233 of the invention A measuring device is proposed, which can realize the automatic measurement of the roll gap of the continuous casting machine through the continuous casting machine together with the dummy bar

In addition, CN101554650A discloses an online calibration control method for the light pressure pull-down car roll gap of a bloom continuous casting machine. The rolls are lightly reduced, and the wide and thick plate continuous casting machine adopts the fan section of densely packed rolls to implement light reduction. Therefore, the online calibration method for the roll gap of the car roller proposed in this patent is not suitable for the light reduction sector of the wide and thick plate continuous caster. Segment opening check

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