Cast-on method for continuously casting half-rimmed steel

A semi-boiling, continuous casting technology, applied in the field of molten steel continuous casting, can solve the problems of continuous casting nozzle clogging, affecting the quality of casting slab, poor fluidity of molten steel, etc., and achieve the effects of convenient operation, prevention of molten steel splashing, and low cost

Inactive Publication Date: 2014-11-12
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, for semi-boiling steel, because the molten steel is in a semi-boiling state and the gas elements in it will be precipitated, the splashing of molten steel in the continuous casting process of semi-boiling steel is much more serious than that of ordinary steel, and even the splashing is not only crystallizer, and will splash out of the crystallizer
Although arranging baffles in the mold can prevent molten steel from splashing on the wall of the mold, it cannot solve the problem of gas precipitation in low-carbon and low-silicon molten steel causing steel droplets to splash out of the mold
For example, for low-carbon and low-silicon steel (for example, H08A), since this steel can only be produced by incomplete deoxidation process (if complete deoxidation is adopted, the fluidity of molten steel will be poor, which will easily cause nodules and blockage at the continuous casting nozzle), and the molten steel is in the Semi-boiling state, so the splash of molten steel during continuous casting is more serious
[0006] Usually, when the continuous casting starts, the static pressure of the molten steel in the crystallizer is small. Due to the strong cooling of the molten steel, the balance of oxygen in the high-temperature molten steel is broken. On the one hand, the oxygen in the molten steel forms O 2 On the other hand, the oxygen in the steel reacts with carbon to produce CO 2 Precipitation (the reaction formula is as follows), the precipitated gas makes the molten steel boil, and at the same time a large number of molten steel droplets splash out of the crystallizer, which not only affects the quality of the billet, but also poses a threat to the safety of continuous casting operators

Method used

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  • Cast-on method for continuously casting half-rimmed steel
  • Cast-on method for continuously casting half-rimmed steel
  • Cast-on method for continuously casting half-rimmed steel

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0049] (1) Molten steel condition

[0050]

[0051] (2) Place coagulation-promoting steel strips with a thickness of about 160mm in the 150×150mm billet mold first, then place two ∮13mm and 90mm aluminum strips in parallel in the middle area of ​​the steel strips, and place multiple aluminum strips around the aluminum strips Surrounded by steel strips, finally press the aluminum strips with 4 steel strips in a well shape to fix them.

[0052] (3) Within 12 seconds of continuous casting, start casting according to 1 / 3~1 / 2 steel flow, and after forming a liquid steel surface with a height of about 100mm in the crystallizer, it enters the normal pouring stage.

[0053] (4) During the pouring process, the molten steel level rises steadily, and there is no boiling or splashing of molten steel. Slab surface inspection and low-magnification inspection are all qualified.

example 2

[0055] (1) Molten steel condition

[0056]

[0057] (2) First place a coagulation-promoting steel strip with a thickness of about 180mm in the 150×150mm billet crystallizer, then place four ∮13mm and 54mm aluminum strips in parallel in the middle area of ​​the steel strips, and place multiple aluminum strips around the aluminum strips Surrounded by steel strips, and finally press the aluminum strips with two steel strips in the shape of a well to fix them.

[0058] (3) Within 15 seconds of continuous casting, start pouring according to 1 / 3 to 1 / 2 steel flow. After forming a liquid steel surface with a height of about 110mm in the crystallizer, it enters the normal pouring stage.

[0059] (4) During the pouring process, the molten steel level rises steadily, and there is no boiling or splashing of molten steel. Slab surface inspection and low-magnification inspection are all qualified.

example 3

[0061] (1) Molten steel condition

[0062]

[0063] (2) Place coagulation-promoting steel strips with a thickness of about 170mm in the 150×150mm billet mold first, then place two aluminum strips of ∮13mm and 95mm in parallel in the middle area of ​​the steel strips, and place multiple aluminum strips around the aluminum strips Surrounded by steel slats, finally use 5 steel slats to press the aluminum strips in a well shape and fix them.

[0064] (3) Within 15 seconds of continuous casting, start pouring according to 1 / 3 to 1 / 2 steel flow. After forming a liquid steel surface with a height of about 110mm in the crystallizer, it enters the normal pouring stage.

[0065] (4) During the pouring process, the molten steel level rises steadily, and there is no boiling or splashing of molten steel. Slab surface inspection and low-magnification inspection are all qualified.

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Abstract

The invention provides a cast-on method for continuously casting half-rimmed steel. The cast-on method comprises the following steps of: putting a coagulation steel plate on an ingot guide head in a crystallizer; putting metal aluminum on the coagulation steel plate, and fixing the metal aluminum to prevent the metal aluminum from floating on a molten steel surface during cast-on; and performing cast-on. By the cast-on method, molten steel can be stopped or prevented from sputtering during continuous casting of the half-rimmed steel; and the cast-on method has the advantages of low cost, convenience in operation and the like.

Description

technical field [0001] The invention relates to the technical field of continuous casting of molten steel, and more specifically, relates to a method capable of preventing semi-boiling steel from splashing during continuous casting. Background technique [0002] Usually, in the molten steel smelting process, the molten steel can be divided into boiling steel, killed steel and semi-boiling steel according to the degree of deoxidation and pouring system. The so-called boiling steel means that at the end of steel smelting, the molten steel is only deoxidized with a weak deoxidizer, and a considerable amount of FeO is kept in the molten steel. During pouring and solidification, due to the reaction between carbon and FeO, the molten steel continuously precipitates CO, resulting in boiling. Phenomenon, so called boiling liquid steel, represented by the symbol F. This kind of steel has a high yield, but there are many small bubbles distributed in the steel ingot (these bubbles can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/18B22D11/08
Inventor 刘志军易良刚黄生权吕学辉蒋世川万朝明彭可雕
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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