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A method for controlling argon blowing at submerged nozzle of continuous casting crystallizer

A technology of continuous casting mold and control method, applied in the field of continuous casting technology, can solve the problems of slag entrainment, exposed molten steel on the upper surface, nozzle blockage, etc., to reduce the generation of out-of-group bubbles, avoid secondary oxidation, and be beneficial removal effect

Active Publication Date: 2019-06-18
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, improper argon blowing will also bring negative effects: too much argon blowing will easily cause the upper surface of molten steel to be exposed and slag entanglement; too small argon blowing will cause nozzle blockage and bias flow

Method used

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  • A method for controlling argon blowing at submerged nozzle of continuous casting crystallizer
  • A method for controlling argon blowing at submerged nozzle of continuous casting crystallizer
  • A method for controlling argon blowing at submerged nozzle of continuous casting crystallizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The cross-section of the wide and thick slab is: K=2300mm, H=220mm, and the casting speed is V c =0.8m / min, assuming that the volume flow rate of the initial argon in the cross section of the nozzle is η=10%, the initial value of the flow rate of the argon gas (at the upper nozzle of the submerged nozzle) should be controlled at:

[0054]

[0055] Then, fine-tuning is carried out according to the outlet situation on the upper surface of the crystallizer slag layer, and the fine-tuning includes:

[0056] By controlling and fine-tuning the volume flow rate of argon, the argon gas bubble clusters emitted from the outlet of the submerged nozzle 1 are concentrated in a fan-shaped area relative to the projection of the wide side wall surface 15 of the crystallizer, preferably as figure 2 within the sector shown.

[0057] The fine-tuning specifically includes: by controlling and fine-tuning the volume flow rate of argon, the argon gas bubbles ejected from the outlet 2 of t...

Embodiment 2

[0060] The cross-section of the wide and thick slab is: K=2300mm, H=300mm, and the casting speed is V c =0.6m / min, assuming that the volume flow rate of the initial argon in the cross section of the nozzle is η=10%, the initial value of the flow rate of the argon gas (at the upper nozzle of the submerged nozzle) should be controlled at:

[0061]

[0062] Then, fine-tuning is carried out according to the condition of the discharge port on the upper surface of the crystallizer slag layer, so that the argon gas bubble group in the crystallizer constitutes the attached drawing of the specification figure 2 Shape.

[0063] The cast steel plate produced according to this embodiment has no defects exceeding the standard in the ultrasonic flaw detection, and the pass rate of the steel plate flaw detection reaches 98.3%.

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Abstract

The invention relates to a submerged nozzle argon injection control method of a continuous casting crystallizer. The submerged nozzle argon injection control method of the continuous casting crystallizer comprises the steps that S1, the theoretical volume flow rate of injected argon at the temperature of 25 DEG C is calculated based on the width K and thickness H of the section of a cast blank ofa wide and thick plate to be produced and the drawing speed Vc of the cast blank according to a calculation formula (please see the specification for the formula), wherein eta indicates the ratio of the cross section of the argon flow in an submerged nozzle to the cross section of the submerged nozzle, and eta=0.05-0.15; and S2, the argon injection speed is controlled and adjusted according to thetheoretical volume flow rate obtained through calculation, and at this moment, a three-vortex flow field is formed by molten steel in the crystallizer. Preferably, the submerged nozzle argon injection control method further comprises the step that S3, argon bubbles jet out of an outlet of the submerged nozzle are gathered in an area which is in a fan shape relative to the projection of the wall of the wide edge of the crystallizer by controlling and fine adjusting the volume flow rate of the argon. By adoption of the submerged nozzle argon injection control method of the continuous casting crystallizer, the argon delivery speed can be controlled, and the flaw detection qualification rate of produced cast steel plates reaches 98% or over.

Description

technical field [0001] The invention relates to a continuous casting process, in particular to a method for controlling argon blowing at a submerged nozzle of a continuous casting crystallizer. Background technique [0002] Wide and thick plates have very strict requirements on internal quality, especially for important structural parts such as boilers, pressure vessels, pipelines, high-rise buildings, etc. Flaw detection defects are one of the main quality defects of wide and thick plates. Metallurgists at home and abroad have carried out a lot of research work in this area, and found that the main cause of flaw detection defects is the accumulation of small bubbles and non-metallic inclusions in the slab. [0003] In the continuous casting process of aluminum-killed steel, in order to prevent nodulation at the pouring nozzle, the argon blowing technology (stopper blowing argon, upper nozzle argon blowing, etc.) has been widely used in the industry. Argon bubbles can preve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/117B22D11/18
CPCB22D11/117B22D11/18
Inventor 刘中秋李宝宽阮晓明徐国栋
Owner NORTHEASTERN UNIV LIAONING