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Continuous casting pouring method applicable to high-aluminum and low-medium-carbon cold heading steel

A low-carbon cold heading steel, continuous casting and pouring technology, applied in the field of iron and steel metallurgy, can solve problems such as liquid level fluctuations and even flocculation, achieve the effects of suppressing low calcium boiling point, easy operation, and reducing production costs

Inactive Publication Date: 2019-12-20
QINGDAO SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problem that it is difficult to adopt the denaturation treatment of alumina inclusions by feeding pure calcium wire in the casting process, the present invention proposes a method that can effectively solve the problems of liquid level fluctuations and even flocculation caused by severe aluminum oxidation in the casting stage. , the continuous casting pouring method that improves the yield of continuous casting slab

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a method for continuous casting of low-carbon cold heading steel ML08Al. The specific implementation steps are as follows:

[0024] 1) Preparation of the tundish before pouring: After pouring the first furnace ladle to the continuous casting turntable, drive the baked continuous casting tundish trolley above the mold, and then transfer the seamless pure calcium with a length of 0.20 meters The lines are laid flat in the impact area and the pouring area, the adding amount is 0.50 m / ton steel, the thickness of the iron sheet of the seamless pure calcium line is 1.5 mm, and then the tundish is blown with argon for 3.5 minutes;

[0025] 2) Ladle pouring: After placing the sealing gasket of the ladle nozzle, cover the ladle nozzle under the ladle, and use argon for protective pouring. The argon flow rate is 7.5m 3 / h Then the ladle is poured and molten steel is poured into the tundish;

[0026] 3) Tundish pouring: When the liquid level of the tundish pourin...

Embodiment 2

[0030] This embodiment provides a method for continuous casting of medium carbon cold heading steel SWRCH35K. The specific implementation steps are as follows:

[0031] 1) Preparation of the tundish before pouring: After pouring the first furnace ladle to the continuous casting turntable, drive the baked continuous casting tundish trolley above the mold, and then transfer the seamless pure calcium with a length of 0.15 meters The wires are laid flat in the impact area and the pouring area respectively, the adding amount is 0.30 m / ton steel, the thickness of the iron sheet of the seamless pure calcium wire is 1.3 mm, and then the tundish is blown with argon for 3.0 minutes;

[0032] 2) Ladle pouring: After placing the sealing gasket of the ladle nozzle, cover the ladle nozzle under the ladle, and use argon for protective pouring. The argon flow rate is 7.2m 3 / h Then the ladle is poured and molten steel is poured into the tundish;

[0033] 3) Tundish pouring: When the liquid level of ...

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Abstract

The invention provides a continuous casting pouring method applicable to high-aluminum and low-medium-carbon cold heading steel. The method comprises steps as follows: preparation before pouring, pouring of steel ladles and pouring of tundish; a seamless pure calcium line with iron sheet thickness of 1-2 mm is cut into small segments with length of 0.10-0.30 m, the small segments are laid in an impact area and a pouring area respectively, the total addition amount is 0.10-1.0 m / per ton of steel, so that aluminum oxide inclusions formed by aluminum oxidation in a continuous casting pouring process are denaturated in time, the problem of liquid level fluctuation of the tundish due to low boiling point of calcium is effectively solved, the yield of continuous casting billets is substantiallyincreased, and the production cost is obviously reduced.

Description

Technical field [0001] The invention belongs to the field of iron and steel metallurgy, and particularly relates to a continuous casting and pouring method suitable for high-aluminum, medium and low-carbon cold heading steel. Background technique [0002] Aluminum has strong deoxidizing ability and is widely used in the production of automotive steel. As long as it is properly controlled, the oxygen content of the steel can be controlled to a low level, thereby significantly increasing the fatigue limit of the material. However, the aluminum deoxidized steel is prone to cause problems such as liquid level fluctuations and nozzle flocculation during the continuous casting process, especially in the pouring stage of the first furnace of the pouring cycle, the oxidation is very serious. If the large amount of alumina inclusions generated at this time does not float up and remove or denature in time, it is very likely to cause liquid level fluctuations and even flocculation problems,...

Claims

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Application Information

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IPC IPC(8): B22D11/116B22D11/111C21C7/00
CPCB22D11/111B22D11/116C21C7/0006
Inventor 肖超张虎杨尚堃张智涛顾相田王超姜超
Owner QINGDAO SPECIAL STEEL CO LTD
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