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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

Active Publication Date: 2015-10-21
SHANDONG XIWANG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 many types, and it takes a long time to explore
[0004] The secondary cooling air-water atomization cooling is very critical to control the internal quality of the slab, but due to the frequent changes in steel types and casting speeds, the control accuracy and sensitivity of the regulating valve and testing instruments, etc., the control effect of the secondary cooling on the quality of the slab is ineffective. less than full play
However, only relying on the optimization control of the secondary cooling water has certain limitations in improving the quality of the continuous casting slab, and the segregation center shrinkage cavity and central porosity are prone to appear in the continuous casting slab

Method used

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  • Center Porosity Control Technology of Continuous Casting Big Round Billet
  • Center Porosity Control Technology of Continuous Casting Big Round Billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0050] The central porosity control process of the continuous casting bloom includes the following steps:

[0051] (1) figure 1 It is a schematic diagram of the structure of the four-segmented side-exit swirling submerged nozzle. The qualified molten steel is injected into the crystallizer through the four-segmented side-exit swirling submerged nozzle from the tundish;

[0052] (2) Add mold powder, and control the mold immersion depth to about 110mm;

[0053] (3) The liquid level automatic control system is adopted to stabilize the crystallizer liquid level;

[0054] (4) Stable casting speed, keep the casting billet casting speed stable; the arc radius of the continuous casting machine is 12m, and the growth diameter is 500mm for continuous casting of round billets, and the casting speed is controlled at 0.28m / min;

[0055] (5) Stabilize the superheat of molten steel in the tundish, and control the superheat of molten steel at about 20°C;

[0056] (6) Control the secondary ...

Embodiment 3

[0060] The central porosity control process of the continuous casting bloom includes the following steps:

[0061] (1) figure 1 It is a schematic diagram of the structure of the four-segmented side-exit swirling submerged nozzle. The qualified molten steel is injected into the crystallizer through the four-segmented side-exit swirling submerged nozzle from the tundish;

[0062] (2) Add mold slag, and control the mold immersion depth to about 120mm;

[0063] (3) The liquid level automatic control system is adopted to stabilize the crystallizer liquid level;

[0064] (4) Stable casting speed, keep the casting billet casting speed stable; the arc radius of the continuous casting machine is 12m, and the continuous casting round billet with a diameter of 500mm is produced, and the casting speed is controlled at 0.38m / min;

[0065] (5) Stabilize the superheat of molten steel in the tundish, and control the superheat of molten steel at about 30°C;

[0066] (6) Control the secondar...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/18
Inventor 何庆文王棣王辉陈会来言翠文
Owner SHANDONG XIWANG SPECIAL STEEL
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