Sampling device and method for detecting nitrogen content of molten steel by oxygen, nitrogen and hydrogen analyzer

The technology of an oxygen, nitrogen and hydrogen analyzer and sampling device is applied in the direction of sampling device and test sample preparation, etc., which can solve the problems of detecting nitrogen content and the inability to use spark direct reading detector, etc., and achieves simple operation, reduced smelting time and Cost of production, effect of simple devices and methods

Pending Publication Date: 2018-03-13
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a sampling device and method for detecting the nitrogen content of molten steel by an oxygen, nitrogen and hydrogen analyzer. Oxygen, nitrogen and hydrogen analyzer detects and quickly prepares qualified samples, solving the problem that the current spark direct reading detector cannot be used to accurately detect nitrogen content during smelting

Method used

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  • Sampling device and method for detecting nitrogen content of molten steel by oxygen, nitrogen and hydrogen analyzer
  • Sampling device and method for detecting nitrogen content of molten steel by oxygen, nitrogen and hydrogen analyzer

Examples

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example 1

[0032] A heat of 316LN steel was smelted, and the nitrogen content in the design composition was 0.015 (mass percentage). Before smelting, the sampling device is installed on the sampling gun. When the end point of smelting needs component detection, the conical head 2 of the glass container 1 is inserted into the molten steel at a certain safe distance, the high-temperature molten steel melts the conical head 2, and the molten steel is pumped out by using the vacuum inside the glass container 1. Into the glass container 1, the oxygen in the molten steel reacts with the aluminum foil 3, so as to avoid inaccurate detection caused by air bubbles in the sample during the cooling process. The insertion process lasts for about 3 seconds, and after the molten steel fills the glass container 1, it is quickly taken out and water-cooled. After knocking off the glass layer, the sample to be tested can be obtained. There are no air holes on the surface and inside of the sample, and the...

example 2

[0034] A furnace of Cr18Mn18N non-magnetic austenitic stainless steel was smelted, and the design composition nitrogen content was 0.50. Before smelting, install the sampling device on the sampling gun. When the composition is detected at the end of smelting, insert the conical head 2 of the glass container 1 into the molten steel from a certain safe distance. After inserting for 3 seconds, take it out and water-cool it. The test sample can be obtained by knocking the glass layer on the surface and removing the surface layer of the sample by car. There are no pores on the surface and core of the sample, meeting the testing requirements. Sent to testing center for testing. The test result is 0.496, which is close to the design component.

example 3

[0036] A furnace of 317LN steel was smelted, and the nitrogen content in the design composition was 0.10. Install the device on the sampling gun before smelting. When sampling, insert the conical head 2 of the glass container 1 into the molten steel from a certain safe distance. The insertion process lasts for 2 seconds, then take it out and cool it with water. After knocking off the glass layer, the surface layer of the sample is removed by car to obtain the test sample, and the surface and interior of the sample have no pores. Sent to the testing center for testing, the testing result was 0.112, which was close to the design composition.

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Abstract

The invention provides a sampling device and method for detecting the nitrogen content of molten steel by an oxygen, nitrogen and hydrogen analyzer and belongs to the technical field of molten steel sample detection tools and methods. The sampling device and method are used for rapidly sampling in the molten steel. According to the technical scheme, the sampling device comprises a glass containerand an aluminum foil, wherein the glass container is a long pipe; two ends of the glass container are sealed; a chamber of the glass container is vacuum; the aluminum foil is attached on the peripheryof an inner wall of the glass container; the front end of the glass container is a tapered head. In a sampling process, the tapered head of the glass container is immersed into the molten steel; thetapered head is molten under the action of high temperature of the molten steel; the molten steel is pumped into the glass container through the vacuum in the glass container; the molten steel and thealuminum foil attached on the inner wall of the glass container are subjected to aluminum deoxidation reaction, so that the oxygen content in the molten steel is reduced; the success rate of preparing a detection test sample can be improved. The sampling device provided by the invention is simple in structure, convenient to operate and rapid and efficient and can be used for rapidly preparing thequalified detection test sample under the condition that the oxygen content in the steel is relatively high; the detection efficiency is improved.

Description

technical field [0001] The invention relates to a sampling device and a sampling method suitable for online detection of nitrogen content in molten steel by an oxygen, nitrogen and hydrogen analyzer, and belongs to the technical field of detection tools and methods for molten steel samples. Background technique [0002] When smelting nitrogen-containing steel, precise control of nitrogen composition is its core technology. Therefore, in the smelting process and at the end of smelting, accurate detection of nitrogen content is an important means to assist smelting. To detect the content of conventional elements at the production site, a spark direct-reading spectrometer is generally used to detect the composition of a sample with a diameter of 35mm. However, for nitrogen, most steel mills equipped with a spark direct-reading spectrometer cannot accurately detect higher nitrogen content. When using an oxygen, nitrogen and hydrogen analyzer to detect nitrogen content, it is ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/14G01N1/34
CPCG01N1/14G01N1/1409G01N1/34G01N2001/1418
Inventor 常金宝张雲飞赵英利嵇爽李程王卓
Owner HEBEI IRON AND STEEL
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