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Control method for mixed casting of continuous-cast tundish

A control method and continuous casting technology are applied in the field of metallurgy to achieve the effects of improving control precision, accurate and reliable control, and improving the yield of molten steel

Active Publication Date: 2016-01-27
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

This control method has the following problems: the joint position control method between all heats is the same, and the influence of composition differences between different heats on the slab where the mixing part is located is not considered, let alone the impact of different tundishes on mixed casting The impact of the continuous casting slab affects the yield and slab quality
However, the current control method is obviously very extensive and cannot achieve the purpose of precisely controlling the mixing section.

Method used

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  • Control method for mixed casting of continuous-cast tundish
  • Control method for mixed casting of continuous-cast tundish

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Embodiment Construction

[0032] In the continuous casting process, when the nozzle of the next large ladle is opened, a certain amount of molten steel must be left in the tundish to maintain the continuity of casting and prevent the scum on the liquid steel surface from being involved in the mold. When the tundish receives the next batch of molten steel, it is mixed with the molten steel originally left in the tundish, and flows into the crystallizer to form a mixed billet. If the chemical composition of the two heats of molten steel is different, the chemical composition of the molten steel in the tundish will gradually transition. The longer the transition time, the more concrete will be formed. Theoretically, the transition time of the chemical composition of molten steel needs to be infinitely long. In actual production, as long as the chemical composition of molten steel in the tundish is within the normal fluctuation range, the transition can be considered complete. The changes in the composit...

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Abstract

The invention provides a control method for mixed casting of a continuous-cast tundish. The control method comprises the following steps that (1) whether casting is conducted in a mixed casting mode or not is judged according to the judgment criterion based on the component difference between a prior furnace turn and a later furnace turn, a mixing section calculation mode starts to be used and the step (2) is conducted if yes, and treatment is conducted according to a normal casting mode if not; (2) the position and length of a mixing section are calculated; and (3) the initial position and the mixing length of the mixing section for mixed casting of the tundish are sent to a quality judgment model, optimized cutting of a plate blank is controlled by optimizing a cutting model, and comprehensive quality judgment of the plate blank is conducted. According to the control method for mixed casting of the continuous-cast tundish, the position of the mixing section between different furnace turns can be controlled more accurately and reliably, the precision of control over the mixing section is effectively improved, and the yield of molten steel is increased.

Description

[0001] Technical field: [0002] The invention relates to a method for controlling mixed ladle casting in continuous casting, in particular to a control method for ladle mixed casting in molten steel with different components, belonging to the technical field of metallurgy. [0003] Background technique: [0004] At present, the joint positions of different furnaces in continuous casting production are controlled according to the length of the remaining molten steel in the tundish when the ladle nozzle is opened, and the casting length is extended by 20% before and after. This control method has the following problems: the joint position control method between all heats is the same, and the influence of composition differences between different heats on the slab where the mixing part is located is not considered, let alone the impact of different tundishes on mixed casting The impact of the continuous casting slab affects the yield and slab quality. For this reason, it is n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18
Inventor 李卫东宋景欣赵国光
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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