JPS5835461A - Sampler for molten metal and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a good sample with gas venting, by a method wherein a sampler vessel is formed by a sinter of density greater than a prescribed value made by sintering of iron powders finer than that of 80 mesh. CONSTITUTION:A sampler vessel 1 of disc type is provided with a pumping tube 2 made of quartz, a cap 3 attached to the tube 2, a protective tube 4, a fireproof mortar 5, a packing 6 and a holder 7. The sampler vessel 1 has a molten metal sink 8 to obtain disc-like sample and a pipeline 9, and a vent hole 10 is provided at the top of the molten metal sink 8. The molten metal sink 8 and the pipeline 9 are divided longitudinally into symmetric halves which are lapped as shown in the figure to constitute a metal mold. Iron powders being finer than that of 80 mesh and zinc stearate less then 1% as a lubricant are mixed and filled, and molded therein under pressure greater than 3 ton/cm<2> thereby molten metal of a sinter with density greater than 5.5g/cc is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sampler for sampling molten metal.

In the various processes of metal smelting, such as pig iron making, steel making, and casting, it is essential to analyze the composition of molten metal and the amount of gas contained in it from the standpoint of product management. Various samplers have been used for this purpose. Various shapes are used for this sampler, such as disk, block, and pin shapes, depending on the purpose of analysis and the object to be analyzed, but basically it is a container shape that pumps up or sucks up the molten metal. Various container shapes have been devised. The material is a refractory material such as quartz or metal. When the container is made of metal, the base metal of the sampled metal is usually used. For example, samplers for iron making and steel making are made of steel plates.

In order to manufacture this conventional sampler made of steel plate, in terms of a disk type, a low carbon cold rolled steel plate with a thickness of 4 to 6 mm is used, press shearing, drawing, cutting or grinding of ears and edges, and polishing are performed. , surface smoothing treatment, punching of gas vent holes,
It required numerous manufacturing processes such as gluing, which resulted in high costs.

When the collected sample is subjected to instrumental analysis, such as fluorescence Grinding and surface grinding is required for the vehicle operation /'11
The chemical treatment required careful attention, and the manufacturing process was complicated and the yield was usually less than 70%, making it uneconomical5. Even if the hot water is solidified, the gas generated during the solidification of the hot water may not be completely released, resulting in formation of bubbles or bubbles on the surface of the solidified sample1. In a container, gas does not permeate to the outside through the container wall, so this phenomenon is a problem, and this problem is especially associated with the sampling of litho steel.
It was difficult to collect healthy samples. In order to solve this problem, a killing agent such as Azl is placed in the sampler, but this method is undeniably complicated.

The present invention was made with the aim of solving the above-mentioned problems of such steel plates/blurrs, and provides a new sunglass as an alternative to the above-mentioned problems. That is,
The present invention provides a sampler container which is made from a powder mainly composed of iron powder of 80 mesotuunder and made into a sintered product having a density of 5.5 L//CC or more. According to the sampler container of the present invention, extremely healthy samples can be collected, and the container can be manufactured easily and inexpensively with high dimensional accuracy. To manufacture this, powder mainly composed of iron powder with a particle size of 80 meters/yuander is pressure-molded into the desired shape (sampler container shape) under a pressure of 5 tons/a1 or more, and this molding body in a reducing gas atmosphere
It is sintered at a temperature of 0 to 1150C to achieve a density of 5. ．． 5
A sintered product with f/cc or more may be used.

Then, this sintered product may be further subjected to steam treatment in a steam decomposition atmosphere at 400 to 550C.

To explain in detail according to the embodiment of the drawings, FIG. 1 is an overall view of a sampler in which a disk-shaped suction/puller container 1 is set for use in actual sample collection work, and 2 is a pumping tube, which is made of quartz, Made of ceramic or 8-resistant steel. 5 is a camp that was damaged by this pump,
4 is Hoi'ff, 5 is fireproof mortar, 6 is Banoki/,
7 indicates the holder t-.

This disk 5 sampler container 1 houses a water reservoir 8 and a conduit 9 for obtaining a disc-shaped sample.
The top of! R is provided with a gas vent hole 10. In the present invention, the rice/puller container 1 is manufactured as follows.

As shown in Figures 2 and 3, the water reservoir 8 and the pipe line 9 are vertically divided to create a symmetrical 1" body, which is then overlapped as shown in Figure 4 to create a Gunpla. A mold for obtaining half-shaped molded products such as containers and eggplants is filled with a mixture of 80 meshes of iron powder and 1.0% or more of lead stearate as a lubricant. Molded products with shapes as shown in Figures and Figure 5 are formed with a pressure of 3 tons lct& or more.Despite manufacturing differences such as reduction method (sponge iron powder) and spraying method (sprayed iron powder), Usually, metallic iron content is 97% or more, apparent density is 2.0~s, ay/c
c, flow rate is in the range of 25-35 seconds 1502. In order to obtain a fired product with a density of 5.59700 or higher using such iron powder (80 to 100 mesh under), the pressure during pressure molding must take into account the sintering strain of the compact. Even if it is, 5 tons/ff1 or more is required.

In addition to obtaining a pure iron powder product like this,
Additive elements commonly used in iron-based sintered alloys, such as graphite, copper, nickel, etc., may be added depending on the use of the moss/glar to produce graphite-containing or alloyed products.

Next, this compacted product is heated for 1,100 to 1,150 tons in an atmosphere of reducing gas such as H2 gas or CO gas. A sintered product having a sintered density of 5.59700 or more is obtained by sintering at a sintering temperature of . If the sintered density is less than 5.5 f/CC, the porosity will be as high as 30 coefficients or more, the skeleton will be weak and the mechanical strength will not be sufficient, and there is a risk of breakage when receiving molten metal. The surface of the hot water reservoir 8 becomes rough, making it easy for hot water to penetrate, and as described in the comparative example below, post-processing is required to smooth the surface of the collected sample.

This fired product can be used as is, but
It is preferable to subject the product to mild oxidation treatment in a steam decomposition atmosphere at 50C. By this steam treatment, the surface V of the fired product is
'C forms triiron tetroxide (Fe304), which prevents rust, and improves mold releasability when removing the solidified sample from hot water M (receptacle 8).

In any case, this fired product does not require any processing other than shape correction, and as in the illustrated example, the obtained half-fired products are stacked (Fig. 4), and this overlapping part is The sampler container 1 is completed by bonding to the sampler container 11 with an adhesive such as mortar.

In this way, according to the present invention, the desired container shape is molded and sintered in one pressure forming process, so there is no need for intermediate processing or post-processing as with conventional steel sheet products. No need at all, sufficient dimensional accuracy can be ensured, and the product yield is almost 1.
00%, which is extremely economical. The fired product according to the present invention has the advantage that when the molten metal solidifies, the gas generated is released not only from the gas vent hole but also from the entire surface of the container wall. Since it can be harvested, it can exhibit effects not found in conventional products.

Example 1 A commercially available sponge iron powder for powder metallurgy with an apparent density of 2.42 g7cc, a particle size of -100 M/U, a fluidity of 30 seconds 1501i+, and a metallic iron content of 98.7% was mixed with 0.7% stearic acid powder by weight. Powder to which lead was added and mixed for 15 minutes in a V-type mixer was added to a disc-shaped recess (reservoir 8) with an inner diameter of 39.596 mm, an outer diameter of 39.596 mm, and a depth of 7.5 mm, and a diameter that was continuous with this. 1. A semicircular recess (pipe 9) with a depth of 5, and the inside of the periphery of the disc-shaped recess 1. , s Semicircular recess with g diameter (gas vent hole 10)
The powder was filled into a mold designed to form a powder and molded with a shoulder under a pressure of 3°5 to obtain a green compact of 6.2 q/CC.The green compact was then flushed with ammonia decomposition gas. air, 113
01: for 20 minutes to form a molded body of 6.4 f/CC, and 500 C steam decomposition in weakly oxidizing air.
After standing for a minute, the surface layer of the molded body was
), rust prevention and pore sealing were performed, and a molded product for the sump was made.Finally, the molded product was stacked with mortar as an adhesive, and the diameter was 10 mm, the length was 0.5 A thick quartz tube 2 is inserted into the molten metal pumping pipe section and fixed to a paper protection tube 4. Using this sampler, the molten metal of Fe99.5%C092, l/
A disk-shaped specimen was collected after pressing the sample for 3 seconds.
1 (30 da x 15) has a very smooth surface and excellent dimensional accuracy compared to the conventional sump mold, and there is no compositional diffusion between the molten metal and the tumbler fired product container.Example 2 Example I VC used Particle size -350 mesh to the iron powder,
υIL added with 0.7% flaky graphite powder with a carbon content of 985%,
The mixing, shaping and sintering, and steam treatment were carried out exactly as in Example 1, and the sintered density was 6.2 f/CC and Fe 99.2%.
A hot water basin element shaped product with a C016 composition was made. This prototype was made into a sampler in the same manner as in Example 1, and Example 1+1
]The same molten metal as in 1 was sampled, or the recovered disk-shaped sample was different from that of a conventional steel plate sampler.
The surface was very smooth, and there was no carbon diffusion between the molten metal and the blur, which was a concern due to dimensional accuracy.

Comparative Example 1 Example 1 except that a green compact of 5.49/CC was obtained using shoulder pressure of 2.8, and a compact of 5.42 g/CC was obtained after sintering.
Using the same raw materials and the same conditions and processes as in Example 1, we used this sampler to collect molten metal under the same conditions as in Example 1. As a result, the surface of the recovered sample was rough, and there was some welding and infiltration with the mold. 1, which required excessive grinding and polishing in order to make it into an analytical sample.

[Brief explanation of drawings]

FIG. 1 is an overall cross-sectional view showing an example of a disk-type sampler, FIG. 2 is a plan view showing a half body of a disk-type sampler container, FIG. FIG. 4 is a front view of the sampler container in which the halves of FIGS. 2 and 3 are superimposed. Applicant Dowa Mining Co., Ltd.

Claims (1)

[Claims] (1) In a sampler for sampling molten German metal, the material constituting the sampler container is a dense #5.5 Y/L made by sintering a powder mainly composed of iron powder of 80 M/7 Uunder. A molten metal sampler that is a sintered product of CC or higher. Powder containing iron powder as the main phase with a grain size of f21 80 under is pressure-molded into the desired shape under a pressure of 3 tons//cr&, and this molded body is heated for 11 hours in a reducing gas atmosphere.
00-1150? The density is 5.5 after sintering at a temperature of r.
A sintered product of f//CC or higher, and this sintered product is 400
A method for producing a sampler container of molten metal comprising steam treatment in a steam decomposition atmosphere at ~550C.