Method for increasing flaw detection yield of continuous casting sheet head billet and tail billet

A technology of pass rate and tail billet, which is applied in the field of continuous casting slab flaw detection, improves the field of continuous casting slab head and tail billet flaw detection pass rate, and achieves the effect of preventing slag coiling, improving internal quality and improving flaw detection pass rate.

Active Publication Date: 2014-02-19
NANJING IRON & STEEL CO LTD
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Problems solved by technology

[0010] The above 3 patents are mainly aimed at improving the pass rate of steel plate flaw detection by means of process optimization and control under normal pouring conditions, and do not involve the quality control of the head blank and tail blank under the condition of unsteady pouring

Method used

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  • Method for increasing flaw detection yield of continuous casting sheet head billet and tail billet
  • Method for increasing flaw detection yield of continuous casting sheet head billet and tail billet

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Embodiment 1

[0027] A method for improving the pass rate of flaw detection of the head and tail slabs of continuous casting slabs. The method improves the pass rate of flaw detection of the head and tail slabs by improving the internal quality of the slab during the casting process and the end of the pouring process, optimizing the process operation, and improving the pass rate of the head and tail slabs. Requirements are as follows:

[0028] (1) Continuous casting pouring operation

[0029] Before continuous casting starts, argon gas is blown into the tundish to remove the internal air to prevent secondary oxidation of the molten steel. The gas removal time is equal to the volume of the tundish / argon flow; At 2 o'clock, open the stopper, and the molten steel enters the mold from the tundish; when the molten steel level in the mold reaches the position of the side hole of the nozzle, add continuous casting casting slag to prevent secondary oxidation of the molten steel on the inner surface...

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Abstract

The invention discloses a method for increasing the flaw detection yield of a continuous casting sheet head billet and a tail billet. The flaw detection yield of the head billet and the tail billet is increased by improving internal quality of casting billets in the casting process and after the casting stopping process and optimizing technological operation. According to the method, through technological optimization and control under the unstable state condition, the internal quality of the head billet and the internal quality of the tail billet are improved, and then the flaw detection yield of steel sheets is increased. The method is suitable for the field of sheet billet continuous casting, and has significant economical value and practical significance in improving the quality of the casting billets under the continuous casting billet unstable state condition, and especially in improving the quality of variety steel and the material yield.

Description

[0001] technical field [0002] The invention belongs to the field of metallurgy and relates to flaw detection of continuous casting slabs, in particular to a method for improving the qualified rate of flaw detection of the head and tail blanks of continuous casting slabs. Background technique [0003] The production of steel plates mainly includes molten iron pretreatment process, converter process, LF refining process, continuous casting process and steel rolling process. Internal quality defects of continuous casting slabs such as segregation, inclusions, shrinkage cavities, etc. will directly affect the internal quality of the steel plate, reduce the pass rate of steel plate flaw detection, affect product quality and yield, and directly affect its production cost control. [0004] The research shows that the internal quality of the slab is difficult to be effectively controlled when the slab is cast in an unsteady state (such as the casting start stage and the casting en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16
Inventor 靳星王攀峰聂真来吴伟勤
Owner NANJING IRON & STEEL CO LTD
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