Method for removing inclusions by means of determining height of vertical section of continuous casting machine for extra-thick slabs

Abstract

The invention discloses a method for removing inclusions by means of determining the height of a vertical section of a continuous casting machine for extra-thick slabs, and relates to the field of manufacture of extra-thick slabs. The method includes performing simulation calculation by the aid of a three-dimensional solidification heat transfer and flow coupling simulation model and an inclusion movement simulation model; finding a relation among a floating rate and the distribution condition of the inclusions inside a casting blank and the height of the vertical section in a continuous casting procedure; accurately determining the height of the vertical section of the continuous casting machine in order to meet requirements of high floating rate and uniform distribution of the inclusions inside the casting blank in the continuous casting procedure; and setting the vertical section on the continuous casting machine for the extra-thick slabs according to the height. The method has the advantage that damage of the inclusions to the quality of the casting blank is reduced, and the fault detection qualified rate of extra-thick plates which are manufactured by means of rolling the extra-thick slabs is increased.

Description

technical field [0001] The invention relates to the field of extra-thick slab production, in particular to a method for removing inclusions inside the extra-thick slab. Background technique [0002] Straight-arc continuous casting machines are used to produce extra-thick slabs, and these slabs are supplied to wide-thick plate rolling mills to be rolled into extra-thick steel plates. In the continuous casting process, the inclusions inside the slab will cause quality defects inside the slab, especially large inclusions with a particle size of 50 μm to 100 μm. The inclusions inside the slab may be elongated during the rolling process, which may cause the flaw detection of the rolled extra-thick plate to be unqualified. In order to reduce the damage of inclusions to the quality of the slab, when designing the continuous casting machine, the mold of the continuous casting machine and a part of the slab guide section below it are designed to be vertical, so that the mold and its...

AI Technical Summary

Problems solved by technology

From the point of view of favoring the floating of inclusions, the higher the height of the vertical section, the better. However, an excessively high vertical section will increase the hydrostatic pressure, increase the tendency of the slab to "bulge", and increase the possibility of internal cracking. Increase the cost of continuous casting machine and engineering construction investment

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