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Method for improving automatic casting of continuous casting ladle

A technology of continuous casting steel and continuous casting pouring, which is applied in the field of metallurgy, and can solve problems such as damage to production equipment, secondary oxidation of molten steel, unstable billet quality, etc., and achieve the effects of increasing production costs, enhancing the quality of finished products, and improving the quality of molten steel

Inactive Publication Date: 2019-03-01
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The danger that the ladle cannot be poured automatically is very serious
First of all, it affects the normal production order of steel mills
The ladle cannot be poured automatically, and the operators use oxygen burning to drain the water, which affects the normal production of continuous casting, and in severe cases, accidents such as continuous casting breakage occur. At the same time, the waiting time for subsequent ladles is increased, and it is easy to cause cold ladles in subsequent ladles; Secondly, the molten steel is poured open, and the molten steel is in contact with the air, which easily causes secondary oxidation of the molten steel, and the oxidized molten steel enters the crystallizer, causing defects such as longitudinal cracks and inclusions on the surface of the slab, resulting in unstable quality of the slab; finally, the operation of burning oxygen is difficult. , it is easy to cause steel to run between the slides and molten steel to splash, pollute the environment, seriously threaten the health and safety of the operators, and cause damage to the production equipment
[0004] The traditional method to improve the self-opening of the continuous casting ladle is to change the quality of the drainage sand. Although this method can effectively improve the self-opening rate of the continuous casting ladle, it has certain limitations. , the pass rate of continuous casting ladle self-opening limit is up to 95%. If you want to further improve it, it is impossible to achieve it by increasing the drainage sand

Method used

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  • Method for improving automatic casting of continuous casting ladle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The chemical composition and mass percentage of low carbon steel in this example are: C: 0.12-0.20%, Si: 0.15-0.25%, Mn: 0.35-0.55%, P≤0.035%, S≤0.035%; the drainage sand is stored The ambient temperature is 25°C and the ambient humidity is 35%. The chemical composition of the drainage sand is shown in Table 1.

[0023] In this embodiment, the method for improving the self-opening of the continuous casting ladle is to carry out data statistics according to one pouring time, including the following steps: control the ladle lining temperature at 871°C before the converter tapping, and control the converter tapping temperature above the liquidus line of the steel type 90°C, no alloy was added during the tapping process of the converter, the flow of argon gas after tapping was controlled at 140L / min, and the time from tapping to continuous casting was controlled at 110min; Open 15 furnaces, the self-opening pass rate is 100%.

Embodiment 2

[0025] The chemical composition and mass percentage of low carbon steel in this example are: C: 0.12-0.20%, Si: 0.15-0.25%, Mn: 0.35-0.55%, P≤0.035%, S≤0.035%; the drainage sand is stored The ambient temperature is 28°C and the ambient humidity is 55%. The chemical composition of the drainage sand is shown in Table 1.

[0026] In this embodiment, the method for improving the self-opening of the continuous casting ladle is to carry out data statistics according to one pouring time, including the following steps: control the ladle lining temperature at 890°C before the converter tapping, and control the converter tapping temperature above the liquidus line of the steel type 90°C, no alloy was added during the tapping process of the converter, the flow of argon gas after tapping was controlled at 150L / min, and the time from tapping to continuous casting was controlled at 130min; 49 furnaces were opened, and the qualified rate of self-opening was 98%.

Embodiment 3

[0028] The chemical composition and mass percentage of carbon steel in this example are: C: 0.28-0.33%, Si: 0.90-1.00%, Mn: 0.95-1.05%, P≤0.020%, S≤0.015%; the drainage sand is stored The ambient temperature is 23°C and the ambient humidity is 55%. The chemical composition of the drainage sand is shown in Table 1.

[0029] In this embodiment, the method for improving the self-opening of the continuous casting ladle is to carry out data statistics according to one pouring time, including the following steps: control the ladle lining temperature at 860°C before the converter tapping, and control the converter tapping temperature above the liquidus line of the steel type 80°C, no alloy was added during the tapping process of the converter, the flow of argon gas after tapping was controlled at 150L / min, and the time from tapping to continuous casting was controlled at 124min; Open 15 furnaces, the self-opening pass rate is 100%.

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Abstract

The invention discloses a method for improving automatic casting of a continuous casting ladle. According to the method, the temperature of a ladle lining of the casting ladle before smelting steel tapping of a converter is controlled to be 850-900 DEG C, the steel tapping temperature is controlled to be 80-100 DEG C above a steel grade liquidus, and the argon flow after steel tapping is controlled to be 120-160 L / min; and the time from steel tapping of the converter to continuous casting in the continuous casting process is controlled to be less than or equal to 180 min, automatic casting ofthe continuous casting ladle is realized, the quality of molten steel is improved, the labor intensity is reduced, the quality of finished steel products is enhanced, and the continuous casting rate of the continuous casting ladle reaches over 98%. The method for improving automatic casting of the continuous casting ladle is simple and convenient to operate and stable in effect, provides a technical support for automatic control of continuous casting, and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for improving the self-opening of a continuous casting ladle. Background technique [0002] With the use of high-quality structural steel in various industries, people have higher requirements for steel quality. During the ladle refining process, the molten steel refining time becomes longer and the refining temperature becomes higher. The ladle is used in this harsh working environment. Among them, higher requirements are put forward for the success rate of ladle self-opening. [0003] The danger that the ladle cannot be poured automatically is very great. First of all, it affects the normal production order of steel mills. The ladle cannot be poured automatically, and the operators use oxygen burning to drain the water, which affects the normal production of continuous casting, and in severe cases, accidents such as continuous casting breakage occur. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/072B22D11/18B22D41/44
CPCB22D11/18B22D41/44C21C5/28C21C7/072
Inventor 陈子刚郭朝军王建锋李均正连波杨正宗汪鹏
Owner HANDAN IRON & STEEL GROUP
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