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Converter terminal gas all-analysis sampling method by determining carbon-oxygen equilibrium

A converter end-point, full-analysis technology, applied to sampling devices, test sample preparation, etc., can solve problems such as abnormal analysis results, small sample diameter, poor representativeness, etc., and achieve accurate test results, high sample precision, representative strong effect

Inactive Publication Date: 2010-06-16
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. When the gas content exceeds a certain critical content, subcutaneous bubbles will be formed on the surface of the steel; 4. The central looseness of the steel will be aggravated
5. Hydrogen is also an element that produces white spots, which is easy to induce hydrogen-induced cracks
The first disadvantage is that the diameter of the sample is small due to the limitation of the vacuum degree, and some samples have pores on the surface; the second is that the sample must be close to the surface of the molten steel, so the application range is narrow due to the limitation of the sampling position
(2) Gas sampler sampling: This method is suitable for ladles and continuous casting tundishes. The advantage is that the method is flexible and can be used in a wide range. Abnormal, sample representativeness is relatively poor
The disadvantage is that the operation is not flexible; the second is that the sample processing allowance is large, which affects the speed of sample preparation; the third is that the sample mold will form a central looseness and segregation during the cooling process, and even a central shrinkage cavity will appear, resulting in distortion of the analysis results. serious deviation
In the past, people did not pay enough attention to the preparation method of gas analysis samples in steel. Due to the irregular sampling method or poor representativeness, the gas analysis results were unstable, and the analysis results of different batches were not comparable, which not only caused a lot of ineffective labor. , but also bring very adverse effects to scientific research work, and some even mislead

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. During converter smelting, when the temperature of the molten steel and the carbon content in the steel meet the requirements of the steel type, tilt the converter to a suitable position, and then use a sample spoon to scoop a spoonful of molten steel at the end of the converter from the converter. Requirements: The sample spoon must be dipped in For good slag, the spoon head should be inserted 300mm below the slag-steel interface, and the sample spoon should be pulled out to ensure that the molten steel is always covered evenly by the final slag to prevent the molten steel from being exposed;

[0020] 2. Under the condition that the final slag is covered in the sample spoon, the aluminum strip is inserted into the molten steel in the sample spoon to fully deoxidize the molten steel in the sample spoon. The amount of deoxidizer aluminum strip added is 0.1% of the mass fraction of the molten steel. At this time, there is less non-dissolved oxygen in molten steel, so to...

Embodiment 2

[0028] 1. During converter smelting, when the temperature of the molten steel and the carbon content in the steel meet the requirements of the steel type, tilt the converter to a suitable position, and then use a sample spoon to scoop a spoonful of molten steel at the end of the converter from the converter. Requirements: The sample spoon must be dipped in For good slag, insert the spoon head 400mm below the slag-steel interface. During the pulling out of the sample spoon, ensure that the molten steel is always covered evenly by the final slag to prevent the molten steel from being exposed;

[0029] 2. Under the condition that the final slag is covered in the sample spoon, the aluminum strip is inserted into the molten steel in the sample spoon to fully deoxidize the molten steel in the sample spoon, and the amount of the deoxidizer magnesium strip is 0.20% of the mass fraction of the molten steel. At this time, there is less non-dissolved oxygen in molten steel, so total oxyge...

Embodiment 3

[0037] 1. During converter smelting, when the temperature of the molten steel and the carbon content in the steel meet the requirements of the steel type, tilt the converter to a suitable position, and then use a sample spoon to scoop a spoonful of molten steel at the end of the converter from the converter. Requirements: The sample spoon must be dipped in For good slag, insert the spoon head 500mm below the slag-steel interface. During the pulling out of the sample spoon, ensure that the molten steel is always covered evenly by the final slag to prevent the molten steel from being exposed;

[0038]2. Under the condition that the final slag is covered in the sample spoon, the aluminum strip is inserted into the molten steel in the sample spoon to fully deoxidize the molten steel in the sample spoon. The amount of titanium deoxidizer added is 0.15% of the mass fraction of the molten steel. At this time, there is less non-dissolved oxygen in molten steel, so total oxygen can be u...

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PUM

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Abstract

The invention relates to a full-analysis sampling method for converter end-point gas measuring carbon-oxygen equilibrium, belonging to material testing technology field. It is used for solving the problem that easy feasible method is used to realize full-analysis sampling for converter end-point gas. It comprises taking liquid steel by sample spoon, liquid steel de-oxidation, quartz tube sampling,quench sampling and sample machining so on. The invention integrates merits of prior sampling method and creates originally a full-analysis sampling method for converter end-point gas which is provided with convenience and accurate testing result. Characteristics of the method are that 1, sampler can adapts the characteristic that converter end-point liquid steel has high oxygen content and carbon-oxygen equilibrium in liquid steel on converter blowing end point can be measured very conveniently; 2 taking sample is provided with strong representation, high sample accuracy and successful rateof more than 95%; 3, full analysis for [O], [N], [H] content in converter end-point liquid steel can be realized under less devotion and low cost.

Description

technical field [0001] The invention relates to a simple and accurate method for sampling samples for full analysis of molten steel gas at the end point of a converter, belonging to the technical field of material testing. Background technique [0002] Gases in steel include hydrogen, nitrogen and oxygen. The above three elements exist in steel as harmful elements. Their influence on steel is mainly manifested in the following aspects: 1. Reduce the mechanical properties of steel, mainly by reducing the range sexual indicators. 2. The source of cracks is formed, or hairlines are formed. 3. When the gas content exceeds a certain critical content, subcutaneous air bubbles will be formed on the surface of the steel; 4. The center porosity of the steel will be aggravated. 5. Hydrogen is also an element that produces white spots, and it is easy to induce hydrogen-induced cracks. Existing methods for full analysis of molten steel gas at the end of the converter abroad have adop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/02G01N1/28
Inventor 盖领军孙玉虎李庆胜郑伟栋张春杰
Owner HEBEI IRON AND STEEL