JPS5815736B2 - Youyukinzokuno Shiryyousaishiyuyouki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a sample collection container for directly collecting a sample of molten metal such as hot metal or molten steel from a blast furnace, torpedo car, converter, electric furnace, ladle, or the like.

Various methods are conventionally known as means for directly collecting samples for analysis from inside a furnace such as a converter.

For example, there is a method in which a sample collection container is housed inside a tubular body made of cardboard or the like, and molten metal is introduced into the sample collection container through an inlet provided on the side surface or the top of the tip.

The sample collection container may be, for example, a so-called shell mold made by firing and molding fine sand coated with phenolic resin, a mold made of refractory material, a tubular container made of quartz or heat-resistant glass, or a container made of iron or steel. Metal containers made of molds and the like are known.

The present invention specifically avoids the problems that occur when using metal sample collection containers, effectively utilizes the cooling ability of metal sample collection containers, and facilitates the removal of collected samples. It is.

In other words, when collecting a sample of extremely high temperature molten metal such as molten steel, or when measuring the temperature during cooling if necessary, the sample must be cooled in a stable state, and there may be no gas in the sample. The major premise is that there are no bubbles or nests caused by air, etc.

It is known to install a chiller inside a non-metallic mold, such as a shell mold or a refractory mold, in order to stabilize the cooling rate or prevent the formation of bubbles.

When a metal mold is used, the container itself can function as a chiller, so it is suitable for cooling control purposes.

However, when steel pipes, iron pipes, and plates are used as molten metal scrap sample collection containers, there are differences in the material properties of these raw materials, processing methods (differences due to hot and cold processing), processing after processing, storage methods, and storage conditions. The surface condition is not constant due to differences such as

In addition, a considerable amount of time must pass before the container is processed, incorporated into a sample collection device as a sample collection container, and used in the field, and is stored in a container containing moisture, such as a paper tube or cement. Or, due to moisture condensing on the surface of the container, red rust and oxides containing moisture such as FeO and Fe2O3 are generated on the surface of the metal container, and they may be mixed into the molten metal when sampling, or they may be destroyed by heat. may decompose and cause bubbles or nests to form within the sample.

In addition, the surface of the metal container is partially melted by the heat of the molten metal sample, and as the sample solidifies, it becomes welded and integrated, which often makes it extremely difficult to remove the collected sample.

In the present invention, the surface condition of a sample collection container made of a steel pipe, an iron pipe, a press-formed steel container, or a casting is uniformly treated by pickling or degreasing in advance, and then
Furthermore, by providing a sample collection container in which a film is forcibly formed by chemical treatment on the surface of the metal container in order to maintain a constant and homogeneous state, prevent the occurrence of red rust, and facilitate the removal of the collected sample, The purpose is to solve these problems in using conventional metal containers without affecting the components of the collected sample.

By applying basic oxides, neutral substances, etc. in powder or slurry form to the inner surface of large molds, casting molds, etc., it becomes molten when it comes into contact with molten metal, making it easier to release the mold. There are known methods to do this.

However, it is not appropriate to use such a coating-type mold release agent to treat the inner surface of a sample collection container for analysis.

That is, as mentioned above, after the container is processed, it is incorporated into a sample collection device as a sample collection container, and after being transported and stored, it is attached to a mechanical device such as an automatic immersion device and used at the site.
In addition, since it is used as a consumable item, in order to achieve the above objectives, the processing cost per unit should be low, the processing work should be easy, and the film formed should be free from vibrations. It is necessary that the film does not peel off even when subjected to mechanical impact, and that the film is chemically stable and does not affect the analysis sample.

In the present invention, the surface of a steel pipe or iron pipe whose surface condition has been homogenized by pickling, degreasing, etc., or a mild steel deep-draw press molded container, or a cast or steel container molded into a split mold shape that can be divided is used. by alkali oxidation black coloring (black dyeing) treatment (i.e., coloring with a solution of caustic soda, sodium nitrite, sodium nitrate, potassium chloride, sodium hyposulfite, etc., then removing the alkali, and finally treatment with a warm solution of dilute chromic acid.) Triiron tetroxide (Fe3) is added to the surface of the steel container or iron container.
04)) or (Fe3
(Fe4) Processed by chemical methods such as parr force rising treatment (immersed in 2×8H20 solution to form an iron phosphate film on the surface) or heat-resistant plating treatment in which electrogalvanizing is followed by chromium-based treatment. This forms a uniform thin film on the surface of the container.

The film formed in this way inherently has rust prevention and surface protection functions, but even when it comes into contact with extremely high temperature molten steel, it prevents the container surface from dissolving and prevents the surface from dissolving partially. Since welding is prevented, solidified samples can be easily removed.

Incidentally, when looking at the black dyeing treatment, that is, triiron tetroxide (Fe304), the thickness of the film is uniform in the range of 1 to 3μ,
It is dense, hard, has high adhesion to the base metal, has excellent abrasion resistance, can withstand sliding, and has a melting point of 1565℃.
A sample collection container formed in a cylindrical shape, for example, a steel pipe,
Even when using iron pipes, press-formed steel containers, etc., the inner surface of the container does not melt, and the sample can be removed by cutting near the inlet, and then pneumatically transported to the analysis room for subsequent analysis. It also makes the work easier.

Therefore, it is suitable for treating the inner surface of sample collection containers used for collecting samples of molten steel, etc., especially at high temperatures.

Note that, depending on the temperature of the molten metal to be sampled, a sample collection container on which a heat-resistant plating film is formed can be suitably employed as a sample collection container for molten steel or the like.

Further, when collecting a hot metal sample, a sample collection container made of a casting mold on which a film has been formed by parkerizing treatment is used.

A sample collection container based on the present invention will be explained with reference to the drawings.

In FIGS. 1 to 3, A shows an embodiment of a container for collecting samples of molten metal, which is made of cast iron or steel.

In the case of Fig. 1, this container A is a bottomed type with an open top surface so that the molten metal sample flows in from the top.
In the case of the figure, the cylinder body, the upper and lower ends of which are closed by the top wall and the opposite wall, is divided into two in the axial direction, and when in use, a band or paper tube is used so that the divided surfaces abut each other. Although the disassembled type is shown, which is connected with a fixture such as the above, an inlet B for the sample is provided in the top wall so that the inside and outside communicate with each other.

In the case of FIG. 3, a sample inlet B was provided on one circumference of the container having a hollow interior so that the inside and outside communicated with each other.

The entire inner circumference of each of these containers A is treated with black dyeing as described above.
It is uniformly covered with a film C formed by chemical treatments such as parkerizing treatment and heat-resistant plating treatment.

The sample collection container for molten metal such as molten steel and hot metal according to the present invention has the following effects in terms of the above-described configuration and operation.

(1) The molten metal sample collection container of the present invention has the structure described in the claims, and is manufactured by forming a chemically stable, homogeneous, and tough film on the inner surface of the container through chemical treatment. Even during long-term storage from stage to on-site use, there is no rust on the container surface, and sample collection can always be achieved under the same conditions.

(2) As mentioned in (1), since red rust does not occur on the inner surface of the sample collection container, it is especially important to use ferric oxide (F) when collecting samples.
Explosive gas caused by contact between moisture contained in e2e3) and molten steel (IJ swelling that causes bubbles and cavities inside the sample, which are fatal causes of accidents when collecting samples for analysis, is eliminated, and the cooling effect is a characteristic of metal containers.) function sufficiently to enable good sample collection.

(3) Due to the chemically treated film formed on the inner surface of the container, even when molten metal flows in, the surface of the metal forming the container body does not melt, and therefore the solidified sample and the container do not weld together.

Therefore, it is easy to take out the collected sample.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a perspective view of a cylindrical container, FIG. 2 is an exploded perspective view of a split-type container, and FIG.
The figure is a partially cutaway perspective view of a closed container. A... Container, B... Inlet, C... Film.

Claims (1)

[Claims] 1. A sample collection container made of steel or cast metal is characterized by having a coating formed on the inner circumferential surface thereof to prevent rust through chemical treatment, to prevent the collected sample from being dissolved and mixed in, and to allow the collected sample to be removed. Container for sampling molten metals such as molten steel and hot metal.