TWI281025B - Sampling device for complex probe to obtain sample having high purity - Google Patents

Abstract

Disclosed herein is an improved sampling device for a complex probe, which can sample a sample at a time to analyze temperature, oxygen and composition of molten metal during a steel manufacturing process and which can sample samples having high purity. The sampling device comprises an upper chamber mold which has a sprue for feeding molten metal therethrough, and a lower chamber mold which communicates with the upper chamber mold through a runner and in which a sample of molten steel is solidified. A filter is provided in the upper chamber mold.

Description

1281025 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a modified sampling device for a composite probe. The needle system can detect the melting of metal in a steelmaking process. Information on degrees, oxygen, and composition. [Prior Art] = On-body's probe system is used to measure a component or temperature of a tempered steel in a steel process. A composite needle is a probe with multiple functions. The probe γ° is clear - a composite with a conventional sampling device is in the double-headed needle i. A temperature measuring unit 3 is inserted::: a lower part of the paper sleeve 2 And a sample: is provided in the main paper sleeve 2 adjacent to an upper side of the temperature measurement. Thereby, during the steel making process, the composite probe 1 is immersed in various refining furnaces during the conversion process (converters EAF A〇D, V〇D, RH_〇B, LF, LT, B/B) Or a similarly molten metal to treat a sampling procedure and to measure the temperature of the molten steel. However, in particular, the metal oxide system produced during the decarburization step of a refining process In a reduction and desulfurization step "desulfurizatI0n) _, in a non-recorded refining furnace, the sulphur system contained in the refining metal and the Ca 被 used as an auxiliary material The reaction is thereby removed along with the crucible. 1281025 At this stage, because of the alkalinity of the slag, the melting of the deoxidation, the high degree of reorganization, the strong agitation, and the step of desulfurization, the n-reduction of gold and iron The use of the bucket will produce a large slag, and _ is fed into the furnace - the lower adjacent oxygen/oxide (Αγ'Ν2) will be continuously in the molten metal at one side of the square. Accordingly, the enthalpy of the molten metal is severely uneven, and therefore, the slag and the refining and total eyebrow are clearly discerned. An interface between them is not possible to report (4). Therefore, it is impossible to use a conventional probe to order a sampling operation as desired. The figures are a cross-sectional view of a conventional sampling device 4 and a perspective view, respectively. The integrated sampling device 4 includes an upper chamber 5 and a refining steel that is fed into the upper chamber 5 via a pocket 7 downwardly through a flow channel 8 And the one that enters the lower chamber: and then is solidified therein to form a component for the analysis of the composition, which is produced during a refinement process with a probe with an automated sampling device. A large number of melts are used to analyze the sample mix, _ causing deviations and plate defects in the sample, making the analysis of the composition impossible. Because of the fact that many of the gases contained in the refining and chemical metal will cause the stalking of the sputum component or the like in the sample of the smelting metal, it is not possible to do so. In particular, since the thermal conductivity of stainless steel is 1/2 to "/4 of steel, when the probe is in the refining metal, the solidification of 6 1281025 in the lower chamber 6 will not Was completed. Therefore, the probe system is extracted from the glazed metal, and the gas existing at the central portion of the probe is not discharged to the outside. At this stage, the metal in the narrow flow cell 8 having a volume of about 2% of the lower chamber 6 is first solidified, thereby solidifying the metal while the gas is confined in the sample, causing very Large holes are formed in the sample for analysis. Due to the above drawbacks, the probe cannot be used in an actual operation. According to this, in practice, the operator will directly measure a temperature, and ♦ use an inflatable hot surface and a spoon to sample after the refining of the reel. d, due to the manual operation described above, the time of refining is increased: 'there is a decrease in productivity, an increase in wear of the refractory material, a temperature; a drop, and the safety of the operator is lowered. In addition, since the temperature is measured manually, and the sampling is performed after the refining furnace is tilted, a tapping operation system is delayed. Furthermore, since the temperature is lowered in consideration of the inclination of the crucible, the efficiency of the tapping operation and the productivity of the refining cone furnace are at a temperature 10 ° C higher than the target temperature of the tapping. Will be significantly reduced. / Again, the operator must be close to the temperature/door refinement during the measurement of the temperature and sampling operation: the furnace, because the molten metal will splash, it would be dangerous) and - add J mouth, a detained author must be in them When a group is formed at the same time, the productivity of the labor is significantly reduced. SUMMARY OF THE INVENTION According to this, it is produced by the above problem 71281025, and an object of the present invention is to ensure a good sample using a filter. The filter is provided in an upper chamber for absorbing > checking to prevent a small amount of refining edge fed into the upper chamber from flowing into a lower chamber, and for The turbulence caused by an iron static pressure is transformed into a laminar flow. Thereby, a stable inflow is achieved in the lower chamber. Another object of the invention is to ensure a good sample by reducing the excess heat of the molten steel. In order to achieve this, a size of a runner is controlled and a vent is formed to prevent the gas contained in the molten metal from flowing into a lower chamber in a maximum manner to prevent The metal in the launder first solidifies and serves to lower the temperature of the molten metal fed into the lower chamber, thereby reducing the superheat of the molten steel. A further object of the invention is to ensure improved productivity and safety during a refining process. To achieve this, a lower amount of hot valleys is added to the maximum to increase the solidification rate of the molten steel fed to the lower chamber. Furthermore, the shape of a sample is optimized and is directly contained in a swaying vehicle to be transferred to a room for analysis, while the remaining solids are not accommodated from above. The room was removed. Therefore, it is possible that during the refining process, a temperature measurement and a sampling procedure are performed in an automated manner while a furnace is not being tilted, ensuring improved productivity and safety during the refining process. In order to achieve the above object, the present invention provides a sampling device for an 8 1281025 mold ': the sampling device includes an upper chamber - a k lower chamber mold, and the upper chamber mold The mold system n 1 is fed with a glazed metal; the lower chamber, the lower chamber-flow tank is in communication with the upper chamber mold and a molten sample is solidified therein. A filter is provided in the upper mold to the mold. Furthermore, the present invention provides a sampling device for a composite probe. The 4 sampling device includes an upper chamber mold and a lower chamber mold, which is singular and sturdy. The chamber mold has a washing σ for feeding a tempered metal therebetween. The lower chamber mold is connected to the mold via a trough, and a sample of refining steel is solidified therein. . In this aspect, the launder is formed such that the volume ratio of one of the launders to the lower chamber is between 5% and 11%. In addition, the present invention provides a sampling garment for a composite probe. The sampling device includes an upper chamber mold and a lower chamber mold, and the upper chamber mold has a In between, a gate of molten metal is fed, and the lower chamber mold is connected via a lattice mold above the 谷 4 and a sample of the tempered steel is solidified therein. In this aspect, a vent is formed at a bottom of the upper chamber mold. [Embodiment] Hereinafter, a detailed description of embodiments of the present invention will be provided with reference to the drawings. Figure 3a and Figure 3b are cross-sectional views of a sampling device in accordance with one embodiment of the present invention, wherein a filter is provided in an upper chamber 9l28!〇25 to. In Fig. 3a, the foot is in Fig. 3b, and has a cylindrical shape and a shape of a hexagon. In the middle, the system is inserted into a probe - a main paper sleeve - chamber: with: - ^ people reverse the lower chamber mold and 20, Gu Shishi - to the wedge is provided in the upper chamber mold μ >A^ 12 , L 犋,, 10 below, for

The genus = square chamber mold 1M is connected, and a sleek gold sample is placed in the lower chamber, and the appliance is included. A space defined by the upper capacitive element is called an upper chamber, and the space defined by the two-dimensional chamber mold 20 is called - the lower valley is 18 degrees. The chamber mold! 〇 can be divided into: an upper chamber mold 15 above and an upper cooker 16 6. A cylindrical or hexagonal transition 13 is provided in the upper chamber mold 10 The towel, especially in the lower chamber mold 4 16 below. The valley above the mold to the mold 10 can be divided into upper and lower portions, or divided into left and right portions. The upper chamber mold above is 〇 The center of the mouth has a cylindrical space for feeding and smoothing the molten metal. Moreover, because of the cylindrical space, a deoxidizing agent inserted in the form of a yellow bullet is very easy to insert and deoxidize. The efficiency of the agent will be improved. At this stage, examples of the deoxidizer include Ti, Zr, A1, and the like. " The upper valley to the mold 16 below the sea has a cylindrical space, with 10 1281025 to Be The surface area of the filter 13 supplied therein is increased to the maximum, thereby enhancing the collection ability of the scum and the gas discharge capacity, and the superheat of the transferred steel. Alternatively, the lower upper chamber mold 16 may have one a hexagonal space. In this case, the hexagonal filter η is: into the upper chamber mold below. The filter π is supported and fixed to the upper chamber mold 15 In a cylindrical space,

And therefore, the 'manufacturing system becomes very easy, and the assembly workability of the filter 13 is improved. The space below the chamber chamber | 2 〇, that is, the lower chamber 形成, is formed such that an inner diameter is gradually reduced downward at a predetermined ratio to cause directional solidification of the sample. Thereby, the lanthanum in the sample moves upward, and therefore, it is possible to sufficiently ensure an analysis region of the sample. + Again, a heat capacity of the chamber mold 2 亥 depends on the specific heat of a U material and the weight of the mold. The size of the sample is reduced within a range that can be performed by an analysis to increase the heat capacity of the lower chamber mold 20 to a maximum, and the thickness (4) of the bottom portion is increased, and: one of the lower chamber molds The thickness of the wall portion is increased to the maximum, increasing the cooling rate of the molten steel fed from the upper chamber 17, by the time of the force reduction. According to this, the suspected system is completed while the probe is still in the molten metal, whereby the coagulation fatigue which is inevitably formed is moved from an analysis surface to the upper chamber 17. Therefore, it is also possible to ensure the soundness of the analysis area of the sample. !28l〇25 At this stage, it is preferable that the heat capacity is 5 〇 cairc or more. * In addition, the size of the sample is set to Μ to Η, and the thickness (d) of the lower reaches to the puller 20 is set at 15 to 25 minutes. The 乂仏 读 'reading the upper chamber mold 1 〇 is made of ceramic (A 2 instead of cerium oxide (Si〇 2). The ceramic powder is compression molded using a compression molding machine and then sintered to Manufacture of the ^ 方 谷 谷 谷 谷. II A, the upper chamber mold will provide thermal resistance to the ceramic sputum sampling device exposed to high temperature linearization. The Λ system is caused by the following facts, to prevent pollution The effect of one carbon element is not possible. 7. Preferably, a material used for the lower chamber mold 2 is low-cost cast iron and cast steel, which has high specific heat and is easy to process 'to facilitate To ensure the soundness of the sample. It is preferred that the height of the filter 13 in the upper chamber is maintained, and is the same as the half of the washing σ u, that is, the winding U If the height of the 遽H 13 is less than the center of the rinsing u, when the sample is separated from the probe, the molten steel flows down from the inlet of the gate to the filter. One upper side is simultaneously solidified' and therefore large A refining steel system of which the outer diameter of the sample is not important is formed at the port 1 iv 4 β. Therefore, it is necessary to perform pretreatment of the sample, or to hit the sample with a hoe. If the damper is used The south is more than the wash. If the center of 11 is higher, the 'melted steel feed will be disturbed' and therefore the sample will not fill up sufficiently in the lower chamber. Therefore, it is better to adjust the height of the filter. Set one above and below the center of ^u to a range from -5 mm to +5 mm. 12 1281025 At this stage, an outer width of the overfishing ^^ w state must be less than the outer diameter of the sample. The reason is: fire ^,, 疋 · When the height of the filter 13 is smaller than the center of the gate, the entrance of the refining steel sluice flows downward and solidifies on the outside of the filter矣; ^ u on the surface. Accordingly, it is necessary to provide a gap around the filter corresponding to the outer diameter of the sample. In fact, one is used to transfer the sample port from a room for analysis. The typical pneumatic Gonghe #曰上动载具系 has a About 85 mm in length received, is preferred, exposing [sigma],

The sample σσ and the total length of the upper chamber are 80 mm. Accordingly, the thickness of the filter crucible is preferably about 30 mm when the sample has a high sound intensity of 50 mm. The filter, 13 of a material is an oxidation fault at a high temperature of 16 generations or higher, at (10) t to earn. (10) (4) Soil, and 1200 CW 1500 C of cerium oxide, in order to adjust the characteristics of high temperature and to accurately control the composition. As described above, the type of the material changes with temperature in order to prevent loss of function applied to the filter device of the sampling device within a range in which the inherent properties of the material are not It will change depending on the transformation of one phase of the ceramic material at the parent temperature. When selecting the type of material, 'if the cerium oxide-based filter is used at a high temperature of 1600 ° C or higher, the phase transition will start at about 135 ° C, and the filter will start. Will melt at about 16 ° C. Therefore, the pores of the porous material are clogged, the filter is melted, and the melted filter is fed into the lower chamber, thereby adversely affecting the soundness of the sample. 13 1281025 The filter is made of a sponge-shaped porous ceramic, so that the molten metal will flow in a chaotic manner, rather than in a uniform direction, through the pores, thereby having the desired porosity. As for a pore of the filter, the filter has a pore size of 5 to 20 PPI (PPI · · per inch). A filter with a 5 to 20 PPI function to increase a surface area, control the fluidity of the molten metal due to its spiral flow path, reduce the temperature of the feed, and mechanically pass over an upper portion thereof. An unreacted auxiliary material at a fraction of φ that is larger than the pores. Further, the degree of slag is 1 to 5 to 2.5, and the slag has excellent wettability with respect to the ceramic filter system. Therefore, the slag which is fed into the mold via the pores reaches the filter and is then absorbed onto the filter, thereby separating from the molten metal. However, when the filter has control, that is, the filter slag is mixed while being immediately fed, the temperature of the molten steel is lowered, the function of the superheat is lowered, and the function of laminar flow is lowered. For staged filling. When the filter is desired, the molten steel enters and the sample is not sufficiently filled. 5 ΡΡΙ or less, in view of the main function of the slag, the molten steel is fed into and sent to the lower chamber, and the result is a reduction in the melting of the steel so that the molten steel is turbulent When the molten steel can reach a temperature of 20 Torr or more, the flow system of the non-square chamber can be suppressed, so that the sampling device is three-dimensional, and a region of the gate is shown in FIG. 4a and FIG. 4b according to the present invention. An example view in which the 14 1281025 domain is magnified compared to a conventional sampling device. In Fig. 4a, the lower upper chamber mold has a cylindrical space, and in Fig. 4b, the lower upper chamber mold has a hexagonal space. The flow channel 12 of the sampling device is such that the filter 13 of the upper chamber 17 can communicate with the lower chamber 18 via the flow channel, and is like a path for causing the upper volume to be fed via the wash port u The steel in which the chamber is melted can be contained in the lower chamber 18.

Preferably, the volume ratio _ of the launder 12 to the lower chamber 18 is 5% to η%. The reason for this is: # When the ratio of the volume of the launder 12 to the volume of the lower chamber 18 is less than 5%, since the molten steel in the launder will solidify earlier than the sample in the lower chamber 18 The gas is not emitted during the solidification of the sample and, therefore, voids are formed in the sample. When the ratio of the volume is greater than η %, the turbulence will occur due to the flow of the tempered steel, and the ability of the gas to be removed from the lower chamber U by (4) will be reduced, and the gas will be That's it. There is fatigue in the mouth. Figure 5a and Figure 5b show a venting opening 14 provided at a lower portion of the upper chamber mold 16 below. In Fig. 5a, the lower upper chamber mold has a cylindrical space, and the upper chamber mold below the 'in the drawing' has a hexagonal space. Fig. 5a and Fig. 5b show the upper side of the top down = the good place 'below the lower part of the lower chamber mold... the lower part: the branch is made so that 2 to 4 vent holes will be formed." 'Each vent has a width of 1 to 2 mm - 15 1281025 and a medium length, while tilting at an angle of 45 ° to + 45 ° based on a virtual line, the virtual line is the upper chamber The center point of the mold j 连结 is joined to the center of the gate 11 to facilitate the smooth discharge of the gas leaving the lower chamber 丨8. The reason is as follows. If the gas is not discharged from the lower chamber during the filling of the molten steel, since the lanthanide due to the gas is formed in the sample, an analysis of a component is performed as desired. Very difficult. Furthermore, one reason for the value of one angle is limited. In the process of filling the molten steel, a gas flow path is concentrated in front of and behind a guiding path of the gate. On the part. In addition to this, the width and length of the vent hole are limited. The leakage of molten steel does not act as an obstacle to the use of a pneumatic vehicle or for analysis. Figure 6 is a cross-sectional view of a sampling device in accordance with another embodiment of the present invention. The sampling device of Figure 6 includes a filter n, a flow cell, and a venting 14' and the combination of these elements significantly improves a technique for producing a clean sample. Figures 7a and 7b show samples produced using a sampling device in accordance with the present invention. In Fig. 7a, a lower portion of an upper chamber is in the shape of a circle: a main shape, and in Fig. 7b <, a lower portion of the upper chamber: a portion having a hexagonal shape. After removing the mold, a transitional 13 series continues to remain on one of the upper sides of the sample 19. The sample line 16 1281025 is then cut to produce a sample for analysis. The invention is further understood by the following examples, which are set forth to illustrate the invention, but not to limit the invention. Example 1 In this example, a filter is used, but no filter is used in the comparison example. The results are described in Table 1. After the sampled steel is sampled, the system is judged to be successful when a good sample that can be used to perform an accurate component analysis is obtained. On the other hand, when the slag system is mixed with a sample, or due to shrinkage due to shrinkage or pores due to gas, it is not possible to perform component analysis as desired. Will be judged as a failure rate 〇 Table 1 Use filter use failure rate (%) 11.6% (7/43) 50% (15/30) In this example, the composition analysis based on the use of the filter The failure rate was confirmed using a Square2 (Chi Square) statistical analysis, and the result was found to be: because a P value is 〇·〇〇, it is statistically significant. In this way, the use of the filter is determined to be an important factor influencing the failure rate of component analysis. Example 2 The operation was carried out while the heat capacity of one of the molds was changed, and the results of 17 1281025 are described in Table 2. Taibu ^ T After the molten steel is taken from the sample, when a robust sample can be obtained that can be used to perform a precise component analysis, the system is judged to be successful. Test. On the other hand, when the slag system is mixed with a sample, or due to shrinkage due to shrinkage or pores due to gas, it is not possible to perform component analysis as desired. Will be judged as a failure rate. Table 2 Heat capacity of the mold 51.4 57 1 Failure rate 60.0 % 28.6 % 17.2 % (%) (12/20) (8/98 ^ ----- V 0/Zo ) (5/29)

^ Do not sue, ~ rip this time, the failure rate of your analysis is confirmed by a logistic regression (L i丨·, oglstlc Regression) statistical analysis, the result is the regulation 5 丨. 疋七现到· because - The P value is 0·002, which is statistically obvious.蕤μ ^ , in this case, the heat capacity of the mold is determined to be an important factor affecting the failure rate of component analysis. One of the samples obtained using the Dream Fan & 4 Moonlight Show according to the present invention was subjected to the following processing procedures. In the process of refining the molten metal, one of the needles will be lowered into a shovel and a smelting furnace, and the relay will be/into the molten metal and reach the distance of the molten metal. #J ^ A depth of 500 mm for a period of 4 to 5 seconds while using a white tilted, set refining oven is not maintained in a refining position. Thereby, the refining steel stream 18 1281025 is supplied into the lower chamber i8 4 among the probes to form a sample 19 'and the probe is retracted' to take the sample 19 from The probe is separated. The solids formed in a gentleman A ^ , the upper chamber 17 are forcibly removed or cut, placed in a carrier, and transferred to a via a pneumatic carrier tube A room for analysis to analyze the composition of the molten metal during the refining process or to analyze the final component.

In the present invention, while the probe is immersed in the molten metal and maintained therein for 4 to 5 seconds, the molten metal flow is fed to the upper valley to 17 via a wash port. It enters the lower chamber 18 through a filter 13 and a launder 12 and begins to solidify therein. When the probe is held in the molten metal for a predetermined time (about 4 to 丨 " seconds) and is withdrawn from the molten metal, it is filled in the upper chamber 17 and is thus not solidified. The molten metal is discharged through the washing machine due to gravity. The solidified metal system remains in the filter 13 and the lower chamber 18 and can therefore be placed directly into a pneumatic carrier without the need for additional processing. According to this, the solidified metal is placed directly into the pneumatic carrier without additional pre-treatment and then transferred to one for analysis, thereby reducing the waiting time after sampling, the result It is the surface oxidation system that is reduced and the variation in composition is reduced. Further, after the sample 19 was cut at a point of 17 to 2 mm from the bottom thereof using a cutter in the room for analysis, whether or not the hole 瑕疵 was formed on one cutting surface of the sample The upper system 19 1281025 will be observed. Subsequent samples were analyzed using an analytical instrument. It is clear from the above description that the present invention has the following advantages. First, in a process that is considered to be impossible to soundly sample during a refinement process using a large amount of slag, oxygen, and inert gas, since helium is not formed in a sample located in a lower chamber. On top, there is no need to perform manual temperature measurement and sampling operations. According to this, information about a processing program can be quickly determined, and thus the time of refining is reduced, thereby improving the refining process. In addition to this, the sampling operation is automatically implemented, thereby improving the safety and productivity of the operator. Second, since there is no need to carry out pre-treatment on the selected samples, : Cui Bao Queen. Furthermore, transferring a 5 liter sample to a room for analysis can be performed quickly, thereby reducing the processing time and significantly improving the accuracy of the analysis. _ Second, a filter is used to reduce the superheat of refining steel at a temperature of 1600 ° C or more, thereby safely sampling a sample for knife-separating elements to prevent slag Mix with the sample and enhance the appearance of a surface of the "Hai sample. Fourth, a venting aperture is provided to remove imperfections caused by air remaining in the lower chamber from the sample. Fifth, a volume ratio of a flow cell is controlled to prevent the breakage of the μ曰 or the shrinkage caused by the gas. 20 1281025 [Brief Description of the Drawings] The above and other objects, features and advantages of the present invention will become more apparent from the description of the accompanying drawings.

Figure 1 shows a composite probe having a conventional sampling device; Figure 2a and Figure 2b show a conventional sampling device; Figures 3a and 3b show a sampling device in accordance with one embodiment of the present invention. FIG. 4a and FIG. 4b are partial cross-sectional views of a sampling device according to an embodiment of the present invention; FIG. 5a and FIG. 5b are perspective views of a lower portion of a lower portion according to an embodiment of the present invention. Figure 6 is a cross-sectional view of a sampling device in accordance with another embodiment of the present invention; and ' Figures 7a and 7b show samples made using the sampling according to the present invention. , [Main component symbol description] 1 Composite probe 2 Main paper sleeve 3 Temperature measurement unit 4 Sampling device 5 Upper chamber 6 Lower chamber 7 Gate 21 1281025 8 Flow tank 10 Upper chamber mold 11 Washing 12 Flow tank 13 Filter 14 Ventilation 孑L 15 Upper chamber mold 16 above Upper chamber mold 17 Upper chamber 18 Lower chamber 19 Sample 20 Lower chamber mold

Reference 22

Claims (1)

1281025 X. Patent application garden: There are two: square: two = combined probe sampling mold has a - use;:!: a lower chamber mold 'the upper chamber has a self-feeding through which a melting So, the & chamber mold is connected to the upper ~: port by a trough, and the Gabriel Valley to the mold is shipped with I and a molten steel.俜 俜 俜 俜 Λ Λ 谷 谷 谷 谷 谷 杈 杈 杈 杈 杈 杈 杈 杈 杈 杈 杈 杈 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... • • , which has 5 to 20 pores (ρρι). \If the sampling device described in the scope of the patent application, the "疋" is made from the material selected from the group consisting of oxidation and dioxin 2 of. The group consisting of 4 crying as a towel, please take a sampling device of the scope of the patent, the filter is a cylindrical or hexagonal shape. ^ The sampling device described in the first paragraph of the patent, wherein the outer width is less than the outer diameter of the sample, and the length of the sample is 45 to 55 mm. And a sampling device for a composite probe, which comprises an upper chamber mold to form another lower chamber mold, the upper chamber mold having one for In the meantime, a rinsing of molten metal is fed, and the valley below the δ meta-column is connected to the upper chamber mold via a flow channel, and a sample of the refining steel is in the lower chamber mold. Coagulating' wherein the launder is formed such that the volume ratio of one of the launders to a lower chamber is 5 to 11%. 23 1281025 7·—Used for a composite mold having an upper chamber and a lower sampling device, the system comprising a mold system for feeding between: the mold chamber and the lower chamber ;^ θ ^ i , the gate of the molten metal, the valley to the cookware is connected via a flow, and a 彳 ^ U々 "day and the upper chamber mold and a molten steel sample σ solid , wherein the one is passed through the condensing portion of the lower chamber mold. The milk hole is formed in the upper chamber mold. The sample coating according to any one of the claims 帛i to 5 And wherein the flow channel is formed such that a volume ratio of the flow cell to the lower valley chamber is 5 to 11%. 9. The method according to any one of claims 1 to 6 A sampling device 'one of the vent holes is formed at a bottom portion of the upper chamber mold. 1' The sampling device according to claim 8 wherein _ vent holes are formed in an upper chamber At the bottom of the mold. Schema: as the next page. 24