Instrument and method for testing hydorgen contained in molten steel

Abstract

An instrument for measuring hydrogen in molten steel is composed of main body, measuring gun and probe. The main body consists of gas channel system and data processing and control system. The gas channel system comprises measuring and correcting sub-systems. Its measuring method includes such steps as starting main body, flushing ags channel, blowdown process, determining baseline for measurement, and cyclic and closed-loop measurements. Its advantage is correct result.

Description

technical field [0001] The present invention is in the field of analysis of materials by means of determining their physical properties. It is mainly suitable for the determination of hydrogen in molten steel. Background technique [0002] The traditional method of measuring the hydrogen content in molten steel is to take samples from the molten steel first, and after rapid cooling, selection, surface treatment, cleaning, drying and weighing, the analytical instrument uses the melting extraction method or the solid-state heat extraction method to carry out hydrogen extraction. Hydrogen content analysis. Generally, it takes 8-12 minutes (or longer) from sampling to analysis results. In addition, in the process of sampling and sample surface treatment, hydrogen may be lost, and irrelevant hydrogen may be brought in due to reasons such as the sampler is not clean, so that the analysis results cannot represent the true content of hydrogen in molten steel ("Metallurgy Analysis...

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Problems solved by technology

[0005] (2) Porous stone or ceramic fiber is used for the air return pipe of the measuring head to prevent the entry of molten steel and keep the air flow unimpeded, but the experiment found that the use of this measuring head to measure the hydrogen content in the mold casting cannot obtain ideal results;

[0006] (3) The measuring head and the measuring gun are connected by a small claw and a convex post, so that the measuring head is easy to insert into the measuring gun and easy to remove, and there is a certain connection strength between the measuring head and the measuring gun, but when measuring the flowing steel Liquid, especially at the pouring port of molten steel, the connection is not firm enough, and the measuring head is easy to fall off;

[0007] (4) The external protective material of the measuring head is composed of three layers, that is, the innermost layer and the outermost layer are made of paper, and resin and sand are cast in the middle. This structure can ensure that the measuring head will not be damaged in molten steel for a period of time, but for If the required measurement time is long (such as more than 100 seconds), ideal results cannot be obtained, and the measuring gun may even be destroyed;

[0008] (5) The detector in the instrument is directly connected to the circulating gas path, and the slight fluctuation of the gas flow during the measurement process will affect the correct reflection of the hydrogen content in the carrier gas by the detector;

In the actual measurement process, the differences between the individual probes, the insertion depth of the probe and the temperature of the molten steel will all affect the above parameters;

[0011] (8) During the measurement process, the air flow has been circulating in the probe, the measuring gun and the air circuit of the main engine. The fluctuation of the flow rate or pressure during the measurement process will cause the fluctuation of the output signal of the detector, thus affecting the accuracy of the measurement

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