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A method for analyzing nitrogen components of low-nitrogen steel samples in front of furnace

An analysis method and component analysis technology, applied in the field of steelmaking, can solve problems such as data instability, achieve the effect of less wear of the cutter head, ensure accuracy, and improve accuracy

Active Publication Date: 2016-01-13
BEIJING SHOUGANG CO LTD
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Problems solved by technology

The state of the instrument is greatly affected by the state of its gas path and the state of external gas input, and it is prone to data instability

Method used

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  • A method for analyzing nitrogen components of low-nitrogen steel samples in front of furnace

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Embodiment Construction

[0018] see figure 1 , the embodiment of the present invention provides a method for analyzing the nitrogen composition of the low-nitrogen steel sample in front of the furnace, including:

[0019] Step 10: Make a cylindrical sample and cut and mill the sample, specifically: take molten steel through a cylindrical sampler to make an upper diameter of 39cm-41cm, a lower diameter of 35cm-37cm, a height of A cylindrical sample of 68 cm to 70 cm. Cut at 1 / 3-1 / 4 of the top of the sample in the length direction of the sample. When cutting the sample, the cutting speed is 4500-4700 rpm. Mill the sample after cutting, so that the surface of the sample must have a certain regular texture and no blisters and shrinkage cavities on the surface. The sample depth is 15-20mm. Cool the milled sample to below 35°C.

[0020] Step 20: Analyze the nitrogen component of the sample after cutting and milling by direct-reading spectroscopy, specifically: keep the temperature of the laboratory wher...

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Abstract

The invention relates to the technical field of steelmaking and in particular relates to a method for analyzing nitrogen components of a furnace front low-nitrogen steel sample. The method comprises the following steps: preparing a cylindrical sample, and cutting and milling the sample; measuring the sample by employing a direct-reading spectrograph, wherein the argon pressure is set to be 0.27-0.29Mpa, the argon purging time is set to be 2-4 seconds, the pre-burning time is set to be 3-5 seconds, and the integral time is set to be 5-10 seconds; drawing an analytical curve by employing a one-step regression mode by utilizing a series of standard samples, wherein the curve slope is set to be 0.97-1.03, the curve intercept is set to be -0.003-+0.003, the interference element is silicon, and the interference removal coefficient is 0.005-0.010; and exciting the sample twice, recording results from the third analysis point to the fifth analysis point, and calculating the average value to serve as the final detection result. The provided method for analyzing nitrogen components of the furnace front low-nitrogen steel sample is high in analysis precision and high in analysis speed, the iron and steel smelting period is shortened, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for analyzing nitrogen components of a low-nitrogen steel sample before a furnace. Background technique [0002] Generally, the nitrogen composition inspection of steel samples before the iron and steel smelting furnace is carried out by taking rod-shaped samples, which are pelletized and then analyzed by thermal conductivity method, or by taking cylindrical samples, which are prepared by drilling cuttings and then analyzed by thermal conductivity method. Although the analysis accuracy of the above method can meet the production needs before the smelting furnace, the analysis time is long and is easily affected by human factors, which is not conducive to the production control before the iron and steel smelting furnace. Using direct reading spectroscopy to analyze the components in steel has the characteristics of fast analysis speed and simultaneous joint determinat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/67
Inventor 杜士毅金伟顾红琴王涛沈涛
Owner BEIJING SHOUGANG CO LTD
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