JPS60173442A - Quantitative measuring apparatus of carbon adhered on steel plate surface - Google Patents

Abstract

PURPOSE:To obtain quantitatively measured data of organic materials, etc. in the carbon adhered on a steel plate surface and to improve the reliability by detecting in order the generated CO2 quantity at each temp. by utilizing the different burning temp. of carbon and organic material in oxygen atmosphere. CONSTITUTION:High-purity oxygen is sent to an induction heating furnace 1 from a oxygen supplying apparatus 2, the analyzing steel plate to whose surface carbon is adhered is heated to normal temp. -2,000 deg.C in order, CO in the gas generated in the furnace 1 is oxidized to CO2 through a catalyzing furnace 7, and the total CO2 concn. in the gas is detected in order by an infrared absorption detector 6. The temp. of the analyzing steel plate in the furnace 1 is sent to an analyzing temp. detecting apparatus 9 through an emission thermometer 8, and each temp. at the time of detecting CO2 concn. is detected. Respective data obtained at the detector 6 and the apparatus 9 are inputted to a data processor 13, organic materials and smudge in the carbon are divided and displayed, and the carbon quantity is measured quantitatively and accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Oncology Application The present invention relates to a device for quantifying carbon deposited on the surface of a steel plate.

<Prior art and its problems> Adhesive carbon on the surface of a steel plate is generated by carbon in the oil used during cold rolling, carbon in the gas used during annealing, or carbon from the steel plate itself precipitated on the surface. However, if such carbon adheres to the surface of the steel sheet, it will significantly impair the paintability, so it is necessary to quantify the adhering carbon before painting to determine whether or not painting is possible.

By the way, in order to quantify the above-mentioned adhered carbon, conventionally, the adhered carbon on the surface of the steel plate is wiped off using a glass fiber filter paper soaked with a strong acid such as hydrochloric acid9, and the filter paper etc. from which the carbon has been wiped is used as a sample. The sample is melted by blowing oxygen gas into it from one end of the porcelain tube. Then, by causing the carbon in the sample to react with oxygen gas, the 00□ gas is introduced from the other end of the porcelain tube through the conduit into the electrical conductivity meter, and the amount of carbon is measured with the electrical conductivity meter. Quantitatively, it was 1.

However, in the conventional quantitative method described above, since the blank such as glass fiber filter paper is large, it is necessary to widen the range of wiping types on the surface of the Q:'4 plate, which requires labor and requires a large amount of wiping. It is unsuitable for processing steel plates and takes a long time.
Moreover, there were problems such as poor quantitative accuracy.

In addition, in view of the above problems, in recent years, a pair of samples of the same area are cut out from a predetermined position of a steel plate, and one sample with carbon still attached is placed in an Elema furnace maintained at 200 to 1350 °C. The adhering carbon in one sample was reacted with oxygen to quantify 002, and then the adhering carbon in the other sample was removed using hydrochloric acid or a polishing machine, and then this was placed in the Elema furnace in the same way as the previous sample. A method has been proposed in which 002 is determined by charging carbon as a blank and reacting it with oxygen, and subtracting the quantitative values of both to determine the amount of adhered carbon.

However, even with this method, it is labor-intensive because it is necessary to remove the adhering carbon on the other sample using acid or a polisher, and it is also necessary to analyze each pair of samples separately.
Furthermore, the accuracy of quantitative determination of attached carbon is also low because it is not possible to distinguish between organic matter and carbon, and the conventional problems have not been solved.

<Purpose of the Invention> The present invention was made in view of the above-mentioned circumstances and to eliminate various drawbacks.It was discovered that the combustion temperatures of carbon and organic matter in an oxygen atmosphere are different, and this invention is utilized to utilize this principle. Then, the steel plate with carbon attached to the surface is heated in an oxygen atmosphere, and the amount of 002 generated sequentially and the temperature at the time of generation are detected to determine the amount of 002 contained in the carbon. The purpose of this invention is to provide an apparatus for quantifying carbon deposited on the surface of a steel plate, which can easily and accurately quantify the amount of carbon by separating organic matter and smut.

<Structure of the Invention> That is, the apparatus for quantifying adhering carbon on the surface of a steel plate of the present invention includes an induction heating furnace that sequentially heats a copper plate to be analyzed with carbon adhering to the surface from room temperature to 2000°C, and the induction heating furnace. An infrared absorption detector that sequentially detects the total 00□ concentration in the gas through an oxygen supply device that supplies high-purity oxygen and a catalytic furnace that oxidizes OO in the gas generated in the heating furnace to OOj. and an analysis temperature detection device that detects each temperature when detecting the concentration of 002 at any time via a radiation thermometer that constantly measures the temperature of the steel plate to be analyzed in the induction heating furnace, and the infrared absorption detector. It consists of a data processor that separates and displays organic matter and smut in the carbon from each data obtained by the analytical temperature detection device, and the amount of carbon can be accurately quantified from the data displayed by the processor. This will be explained in detail below based on an embodiment shown in the drawings.

<Example> Fig. 1 is a flow sheet showing an apparatus for quantifying adhering carbon on the surface of a steel plate according to the present invention. Then, the relationship between the heating temperature and the amount of 002 generated at that temperature is determined, and the substances contained in the carbon are distinguished according to each heating temperature at which the 002 is generated, to accurately quantify the amount of carbon. This is how it was done.

That is, (1) indicates an induction heating furnace.The heating furnace (1) is an oxygen supply device (2) which will be described later, and while supplying high purity oxygen, the high frequency induction heating furnace is used to This is for heating the steel plate (S) to be analyzed by increasing the temperature from room temperature to about 2000°C. (2) is the induction heating furnace (1)
This is an oxygen supply device that supplies high-purity oxygen. , heated at about 800°C using platinum asbestos as a catalyst,
H21O1aO in the 02 carrier is 002 and H,O
an oxidation furnace (4) configured to convert the oxidation furnace (4) into
) generated by 002 and 1 (20, respectively oo, is 0ak (ascarite), H,0 is 'g (O4O4)
1 (magnesium perchlorate) for decarburization and moisture absorption (5).

Furthermore, 1c [61 is an infrared absorption detector, and the detector (6) detects 00. This is for sequentially detecting the content.

Note that the infrared absorption detector (6) and the induction heating furnace (1
) A catalytic furnace (7) is provided between the gases and the 00 contained in the gas is heated to approximately 600°C using a catalyst such as copper oxide.
By heating with , the CO is converted into 002 in advance so that the amount of 002 in the gas, that is, the amount of carbon, can be detected as accurately as possible by the infrared detector (6). However, H and O generated in this catalytic furnace (7) are detected by the infrared absorption detector (
6) Make sure to absorb moisture in a timely manner beforehand.

Furthermore, (8) is a radiation thermometer that constantly measures the temperature of the steel plate (S) to be analyzed heated in the induction heating furnace (1), and the temperature measured by the thermometer (8) is The state of temperature change is checked using an analysis temperature detection device (described below).

(9) is an analytical temperature detection device, and the detection device (9) is a converter 000 in order to detect a temperature change in comparison with a change in the concentration of 002 detected by the infrared absorption detector (6).
), a regulator (11), and a temperature control programmer (b).

Furthermore, 1cQ8) is a data processor that collects and displays data obtained from the infrared absorption detector (6) and the analysis temperature detection device (9), and the processor α8)
The organic matter in the deposited carbon, the carbon in the smudge, and the steel sheet itself are classified by temperature and displayed in a graph and as a ratio, so that the actual amount of carbon can be accurately determined from the graph.

The device for quantifying carbon deposited on the surface of a steel plate according to the present invention includes:
It is configured as shown in the above embodiment, and has 11
), Next, using the quantification device of the present invention, the amount of carbon deposited on the steel plate to be analyzed, which was a circular plate with a diameter of 15 scales, was quantified.

The quantitative analysis of the above-mentioned steel plate to be analyzed was conducted under the following conditions.

(Analysis conditions) ・Induction heating furnace c high frequency); Output voltage 3.2 KV ・Oxygen supply device; CAIJY-o, flow rate 1 t/-h ・Infrared absorption detector; 002 absorption wavelength 4.2 μm (experimental results) As a result of quantifying the amount of deposited carbon under the above analysis conditions, a graph as shown in FIG. 2 was displayed using a data processor.

That is, in this graph, the curve confirmed at the position of 100°C to 400°C is due to the decomposition of organic matter such as rolling stock attached to the surface of the steel plate to be analyzed, and
The curve located between 0° C. and 600° C. indicates the amount of smudge present between the organic substance and the steel plate to be analyzed.

In addition, in Figure 2, it is confirmed that the organic substances and smuts appear consecutively, but in reality, as shown in Figure 3, the organic substances (solid line) and smuts (broken line) are Each is broken down separately.

- Also, the curve appearing at 900°C to 1300°C is a decomposition curve of carbon in the steel plate itself.

In addition, FIG. 4 is a calibration curve used when measuring the amount of carbon based on each of the above-mentioned data.

<Effects of the Invention> As described above, the apparatus for quantifying adhering carbon on the surface of a steel sheet according to the present invention takes advantage of the fact that the combustion temperatures of carbon and organic matter in an oxygen atmosphere are different, and the a
Since the system is constructed so that the amount of O generated can be sequentially detected, it is possible to accurately and easily obtain data that distinguishes between organic substances and smut contained in the carbon deposited on the surface of the steel plate to be analyzed.

Therefore, unlike conventional devices, the quantification device of the present invention does not require removing carbon adhering to the surface of the steel plate to be analyzed using acid or polishing, and can perform highly reliable quantification.

[Brief explanation of drawings]

Fig. 1 is a flow sheet showing an example of the present invention, Fig. 2 is a graph showing an example of data obtained using the present invention, and Fig. 3 is a flow sheet showing an example of the data obtained using the present invention. 00. Graph showing the amount generated, 4 - 13 pieces per day 8
1st order υ cross 821 Nishiki E = t, f gelaf. (S) is the steel plate to be analyzed, (1) is the induction heating furnace, (2) is the oxygen supply device, (6) is the infrared absorption detector, (7) is the catalyst furnace, (8) is the radiation thermometer, (9 ) is an analytical temperature detection device,
03) is a data processor. Patent Applicant Sumitomo Metal Industries Co., Ltd. JfflA “111 (1 other person) --- 267-

Claims (1)

[Claims] A steel plate to be analyzed with carbon attached to its surface is heated to room temperature to 2000 ℃.
An induction heating furnace that heats the temperature in the first order to ℃, an oxygen supply device λ that supplies high-purity oxygen to the induction heating furnace, and a catalyst that oxidizes the gas ψzu0 generated in the heating furnace to 00℃. The above 00. An analysis temperature detection device that detects each temperature at any time during concentration detection, and each data obtained from the infrared absorption detector and the analysis temperature detection device are displayed separately for organic matter and smut removal in the carbon. A device for quantifying carbon deposited on the surface of a steel sheet, characterized by comprising a data processor and a data processor.