Center Porosity Control Technology of Continuous Casting Big Round Billet

A technology of loose center and round billet, applied in the field of metallurgy, can solve the problems of insufficient effect of quality control of casting billet, not very obvious effect, shrinkage hole in segregation center, etc. , the effect of increasing the proportion of equiaxed crystals
CN103567410BActive Publication Date: 2015-10-21SHANDONG XIWANG SPECIAL STEEL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANDONG XIWANG SPECIAL STEEL
Publication Date
2015-10-21

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a process for controlling center porosity of a large and round continuous casting billet. The process comprises steps as follows: qualified molten steel in tundish is injected into a mold through a four-slitting sided cyclone submerged nozzle; mold fluxes are added, and the depth of the submerged nozzle of the mold is controlled to range from 110 mm to 130 mm; a mold liquid level automatic control system is used for stabilizing a mold liquid level and a pulling rate, and the superheat degree of the molten steel in the tundish is stabilized; the secondary cooling speed of a casting billet is controlled; and M-EMS (mold electromagnetic stirring) and F-EMS (final electromagnetic stirring) parameters are optimized. With the adoption of the process, the large and round billet is produced, melting of the mold fluxes is facilitated, the temperature gradient from a billet shell to molten steel at the core part of the casting billet can be reduced, the overheat degree of the molten steel in the center is decreased, the isometric crystal proportion of the casting billet is increased, the tissue density of the casting billet is increased, and the grade of the center porosity of the large and round continuous casting billet can be controlled.
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Description

technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a process for controlling looseness in the center of a continuous casting large round billet. Background technique

[0002] Loose control of the center of the continuous casting slab. In terms of technology, technologies such as limited casting speed, secondary air-water atomization weak cooling, and low superheat of molten steel are generally used; in terms of equipment, molds are used, and electromagnetic stirring at the end of solidification is used. The high-performance tension leveling machine realizes light pressing of the billet.

[0003] Although the use of limited casting speed and low molten steel superheat has a certain effect on improving the looseness of the slab center, the effect is not very obvious, and what range or a certain value should be controlled in the casting speed and molten steel superheat, plus the steel type There are so many types tha...

Claims

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