A kind of hypoperitectic steel slab continuous casting method

Abstract

The invention discloses a hypo-peritectic steel slab continuous casting method, which is applied to the technical field of steelmaking and continuous casting. A continuous casting process of the method comprises the steps of injecting molten steel into a tundish, and distributing the molten steel into various crystallizers through a nozzle of the tundish; and after distributing the molten steel into the various crystallizers through the nozzle of the tundish, putting crystallizer casting powder with the alkalinity being 1.75+ / -0.10 onto molten steel surfaces in the crystallizers, wherein the crystallizer casting powder is prepared from the component in percentage by mass: 0.6 to 3.0 percent of Li2O. During the process of solidifying the molten steel in the crystallizers, the crystallizersare non-sinusoidally vibrated through a vibration device, so that the crystallizer casting powder can be ensured to guarantee lubrication between solidified slab shells and walls of the crystallizersunder the condition of high alkalinity, longitudinal surface cracks of a slab are reduced, meanwhile, the crystallizers cannot be adhered, and the slab surface quality is improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking and continuous casting, in particular to a method for continuous casting of hypoperitectic steel slabs. Background technique [0002] Production practice shows that continuous casting slabs of hypoperitectic steel with a carbon content of 0.10% to 0.16% are prone to surface longitudinal cracks, which depend on the high-temperature mechanical properties of the steel, solidification metallurgical behavior and the operating status of casting slab equipment. This type of steel undergoes about 0.38% volume shrinkage due to the δ→γ phase transformation, resulting in an air gap between the slab and the mold wall, which reduces the heat transfer rate from the solidified slab shell to the mold. The air gap in the crystallizer is non-uniform, resulting in uneven heat transfer from the shell to the mold and uneven temperature gradient distribution in the solidified shell, resulting in uneven shell thickn...

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Problems solved by technology

[0003] Aiming at this problem of crack defects, the general idea is to reduce the production speed of continuous casting. Although the longitudinal cracks on the surface of the slab have been alleviated, the mold leakage and bonding alarms occur from time to time, which will also seriously affect the surface quality of the slab.