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Continuous casting tundish direct current plasma arc heating control method

A plasma arc and continuous casting tundish technology, applied in the direction of manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problems such as the control method of tundish heating process is not given

Active Publication Date: 2021-11-30
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two documents do not give an accurate and complete process control method for tundish heating

Method used

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  • Continuous casting tundish direct current plasma arc heating control method
  • Continuous casting tundish direct current plasma arc heating control method
  • Continuous casting tundish direct current plasma arc heating control method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A factory smelts low-carbon steel. The process flow is: converter smelting→LF refining→RH refining→continuous casting production. The liquidus temperature is 1531°C and the target superheat is 30°C. A DC plasma heating device is used for double-strand Slab continuous casting: three electrodes, one positive electrode and placed in the pouring hole of the tundish, two negative electrodes and placed near the upstream of the outlet of the tundish, specifically for the steel in the tundish The steps of liquid heating for temperature compensation (that is, the control method of heating the molten steel in the tundish by DC plasma arc) are as follows:

[0025] 1. Opening stage

[0026] 1) When the liquid steel level in the tundish reaches 200-300mm, and when the temperature of the molten steel in the tundish is lower than the set temperature range, lower the electrode to a point 50-100mm above the liquid steel level, turn on the power supply and output direct current to the el...

Embodiment 2

[0038]A factory smelts low-carbon steel. The process flow is: converter smelting→LF refining→RH refining→continuous casting production. The liquidus temperature is 1529°C and the target superheat is 30°C. Specifically, the steps of performing temperature compensation on the heating of molten steel in the tundish are the same as those in Embodiment 1. The difference is: turn on the plasma heating for 11 minutes, set the left and right power to 550kw, and raise the temperature by 8°C. The change of its superheat is as follows figure 2 As shown, it can be seen that during the heating process, the superheat of molten steel can be controlled within ±5°C, and in the later stage of heating, the superheat can be kept within the target value of ±5°C, realizing the precise control of the superheat of the tundish.

[0039] In contrast to this example: when the tundish is not heated and compensated for temperature during the pouring process, its superheat changes as image 3 shown. It...

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Abstract

The invention relates to a continuous casting tundish direct-current plasma arc heating control method, and belongs to the technical field of metal casting tundishes. According to the method, a direct-current plasma heating system is adopted, in the casting starting stage, through the contact and non-contact distance between a lifting electrode and the liquid level of molten steel, by controlling output voltage and current and plasma medium gas output flow and pressure control, finally adjustment is conducted at any time according to voltage fluctuation deviation and arc length deviation, and arc starting and arc stabilizing of plasma arcs is controlled. The continuous casting tundish direct-current plasma arc heating control method provides an electric arc control method for specifically controlling continuous casting tundish molten steel to be heated by adopting plasma, so that the temperature compensation of the continuous casting tundish is effectively realized.

Description

technical field [0001] The invention relates to a process control method for heating molten metal in a tundish of a continuous casting machine by using plasma, and belongs to the technical field of metal casting tundishes. Background technique [0002] In the continuous casting process, the superheat of molten steel is the difference between the temperature of molten steel in the tundish and the temperature of the liquidus line. The superheat of molten steel is a key factor to ensure continuous casting output and slab quality. The high degree of superheat of molten steel in the tundish is conducive to the growth of columnar crystals, resulting in solidification bridging, forming central looseness, aggravating central segregation, and easily leading to central cracks. The superheat is low, and the molten steel is easily polluted by inclusions, causing problems such as nozzle blockage. Therefore, a reasonable degree of superheat can reduce the occurrence of central segregati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/01B22D11/18
CPCB22D41/01B22D11/182
Inventor 宋景欣程乃良王勇郭振和黄成永刘自康李京社王存杨树峰赵梦静左康林
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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