CN114799186B - Method and control device for regulating atomized water pressure based on water atomized molten steel temperature - Google Patents
Method and control device for regulating atomized water pressure based on water atomized molten steel temperature Download PDFInfo
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- CN114799186B CN114799186B CN202210502270.7A CN202210502270A CN114799186B CN 114799186 B CN114799186 B CN 114799186B CN 202210502270 A CN202210502270 A CN 202210502270A CN 114799186 B CN114799186 B CN 114799186B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 73
- 239000010959 steel Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 23
- 230000001276 controlling effect Effects 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 19
- 238000009826 distribution Methods 0.000 claims abstract description 18
- 238000000889 atomisation Methods 0.000 claims description 50
- 239000000843 powder Substances 0.000 claims description 37
- 230000008859 change Effects 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 238000009692 water atomization Methods 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000009529 body temperature measurement Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 7
- 238000002156 mixing Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000012856 packing Methods 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004663 powder metallurgy Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
- B22F2009/0828—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid with water
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The invention discloses a method and a control device for regulating and controlling atomized water pressure based on water atomized molten steel temperature. The water atomized steel iron powder prepared by the method has stable particle size distribution, high raw material utilization rate, no subsequent batch mixing process, improved compressibility, loose packing density, fluidity and other properties, and good consistency.
Description
Technical Field
The invention belongs to the technical field of powder metallurgy, and particularly relates to a method and a control device for regulating atomization water pressure based on water atomization molten steel temperature.
Background
The water atomized ferrosteel powder is an important raw material for preparing parts in the powder metallurgy industry, and the properties such as compressibility, apparent density, fluidity and the like have important influence on the quality of downstream products. With the continuous improvement of the quality requirements of parts in the downstream fields of automobiles, electric tools, household appliances and the like, the performance requirements of the raw material water atomized steel and iron powder are also continuously improved.
The water atomization process technology is a common technology for realizing an industrial production mode in the field of powder metallurgy, and the method is an industrial production mode for producing steel powder by striking steel flow into superfine powder by high-pressure atomized water for high-temperature molten steel through a special nozzle, and then magnetically separating, dehydrating, drying, reducing, crushing, screening, mixing and packaging.
At present, the preparation of water atomized steel and iron powder mainly adopts an electric furnace with the temperature of more than 20 tons to melt scrap steel, then flows into an atomization chamber after reaching supersaturation temperature through a tundish, and utilizes high-pressure water to spray a molten steel column, so that molten steel is scattered, and atomization is completed. At present, the time for atomizing more than 20 tons of molten steel at one time is generally not less than 1 hour, and the molten steel can be continuously cooled during the period. The decrease of temperature can reduce the viscosity of molten steel, increase the surface tension, and easily cause large fluctuation of apparent density and particle size distribution (difference between the beginning and the end) under the same water pressure, thereby widening the particle size distribution of atomized particles, especially large deviation of the front and the rear of atomization, and affecting the performances of the final powder, such as apparent density, fluidity, dimensional change and the like.
The atomization water pressure of the water atomization process can not be changed along with the temperature change of molten steel, and the deviation of the particle size distribution of the powder before and after the atomization process mainly depends on the batch combination after the atomized powder is dried, so that the particle size distribution of the powder is adjusted. Therefore, the powder with the oversized and undersized size is removed, the utilization rate of materials is reduced, the production cost is increased, and the production efficiency is reduced.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides a method and a control device for regulating and controlling the atomized water pressure based on the temperature of molten steel atomized by water. The water atomized iron and steel powder prepared by the method has stable particle size distribution, improves the yield, omits the subsequent batch mixing process, improves the properties of the product such as compressibility, apparent density, fluidity and the like, and has good consistency.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The invention provides an atomization water pressure control device which comprises a first stop valve and a second stop valve, wherein the first stop valve and the second stop valve are connected through an atomization water pipe, the first stop valve is connected with a booster pump, the second stop valve is connected with an atomization spray nozzle, one end of the atomization water pipe is connected with the booster pump, and the other end of the atomization water pipe is connected with the atomization spray nozzle, and the second stop valve controls and adjusts the angle of the stop valve along with the change of atomization time to finely adjust the water pressure.
As a preferable mode of the invention, the first stop valve is a high-pressure stop valve, and the second stop valve is a coaxial motor stop valve.
As a preferable mode of the invention, the angle adjustment range of the second stop valve is 255 ° -300 °.
As a preferable scheme of the invention, the output water pressure of the first stop valve is 10-26MPa.
The invention provides a method for regulating and controlling atomized water pressure based on water atomized molten steel temperature by adopting the atomized water pressure control device.
As a preferred embodiment of the present invention, the method specifically comprises:
1) Measuring and recording the temperature of the surface of molten steel smelted by the electric furnace;
2) When atomization starts, temperature measurement is carried out on molten steel in the tundish and recording is carried out;
3) In the atomization process, measuring and recording the temperature of the tundish molten steel at regular intervals until the atomization process is finished;
4) Combining the molten steel temperature data obtained in the step 1) -step 3) with atomization time, and drawing a molten steel temperature-time curve relationship diagram;
5) Converting the temperature-time curve data into control parameters of a stepping coaxial motor in the atomizing water pressure control device according to the parameters of the atomizing water pressure control device, so that the atomizing water pressure control device adjusts the angle according to preset settings and changes along with atomizing time, thereby adjusting the water pressure, and improving the water pressure according to the decrease of the temperature of molten steel; and after atomization, drying the powder to obtain the coarse powder.
As a preferred embodiment of the present invention, the method further comprises step 6): repeating the steps 1) -5) for a plurality of times, and correcting parameters of the atomized water control device according to the result of powder particle size distribution to finally obtain atomized water pressure control process parameters suitable for the water atomized steel powder atomization process.
In the step 5), firstly, drawing a curve relationship between the atomizing water pressure and the molten steel temperature and a curve relationship between the molten steel temperature and the time in the step 4), and fitting the curve relationship between the atomizing water pressure and the atomizing time; and according to the curve relation between the atomizing water pressure and the angle of the second stop valve, correlating the curve relation between the atomizing water pressure and the angle of the second stop valve with the curve relation between the atomizing water pressure and the atomizing time to obtain the curve relation between the atomizing time and the angle of the second stop valve.
As a preferable aspect of the present invention, the second shut-off valve outputs water pressure as follows: controlling the water pressure at 17.5-17.6MPa within 0-60 min; controlling the water pressure at 17.75-18.5MPa for 60-65 min; controlling the water pressure at 19.1-20.1MPa in 65-70 min; the water pressure is controlled at 20.1-20.5MPa within 70-75 min.
In step 3), the temperature of the tundish molten steel is measured and recorded every 1-20 minutes.
Compared with the prior art, the invention has the following beneficial effects:
1) The atomization water pressure control device can be realized by only slightly changing the original atomization device, additional manufacturing equipment is not needed, the cost of the equipment is reduced, and the device is simple;
2) The method combines the temperature of molten steel with the automatic control of water pressure, and solves the problem of widening powder particle size distribution caused by temperature reduction in the early and later stages of atomization;
3) The water atomized steel iron powder prepared by the method has stable particle size distribution, saves the subsequent batch mixing process, improves the properties of compressibility, bulk density, fluidity and the like of the product, and has good consistency.
Drawings
FIG. 1 is a graph of molten steel temperature versus atomizing time during 20t electric furnace atomization.
FIG. 2 is a graph of atomizing water pressure versus molten steel temperature.
Fig. 3 is a graph of atomizing water pressure versus atomizing time.
FIG. 4 is a schematic diagram of a dual shut-off valve hydraulic control architecture.
Fig. 5 is a graph of on-axis motor shut-off valve angle versus water pressure.
FIG. 6 is a graph of atomization time versus in-line shut-off valve angle.
In the figure, 1. A first stop valve; 2. a second shut-off valve; 3. an atomizing water pipe; 4. an atomizing spray head.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 4, the present invention provides an atomized water pressure control device, which comprises a first stop valve 1 (i.e. a high-pressure stop valve) connected through an atomized water pipe 3 and a second stop valve 2 (i.e. a coaxial motor stop valve), wherein the first stop valve 1 (i.e. the high-pressure stop valve) is connected with a booster pump (not shown in the figure), the second stop valve 2 (the coaxial motor stop valve) is connected with an atomized spray head 4, and the second stop valve 2 (the coaxial motor stop valve) controls and adjusts the stop valve angle to finely adjust the water pressure along with the change of the atomized time.
The angle adjustment range of the second shut-off valve 2 (coaxial motor shut-off valve) is 255 ° -300 °.
The output water pressure of the first stop valve 1 (i.e., the high-pressure stop valve) is 10-26MPa.
The invention also provides a method for regulating and controlling the atomized water pressure based on the temperature of the water atomized molten steel, which is carried out under the condition that the tapping temperature is 1720 ℃.
Examples
The embodiment provides a method for regulating and controlling atomized water pressure based on water atomized molten steel temperature, which comprises the following steps:
1) Before molten steel is atomized, a high-pressure stop valve is fully opened, after a booster pump is started, the water pressure is reduced to 10-26MPa by using the stop valve, and then the coaxial motor stop valve is opened, so that the water pressure is reduced to 15-18MPa; the reason is that the opening and closing degree of the high-pressure stop valve is nonlinear with the water pressure, and the newly added coaxial motor stop valve can ensure that the valve opening angle has approximate linear relation with the water pressure within the range of 25-80% of the input atomized water pressure, as shown in fig. 5. The output water pressure of the high-pressure stop valve is 26MPa, and the angle of the stop valve of the coaxial motor is in the range of 255-300 degrees to finely adjust the water pressure.
2) And placing the steel ladle containing molten steel on an atomization platform, starting atomization, starting a coaxial motor program, and starting timing.
The hydraulic control program of the coaxial motor is shown in fig. 3, and is obtained according to the two sets of data in fig. 1 and 2.
Firstly, by measuring the change rule of the molten steel temperature with time in production, as shown in fig. 1, when the molten steel is poured into a ladle initially (namely, about 0-10 min), the temperature of the molten steel in the ladle (from 1640 ℃ to 1660 ℃) rises, and the temperature is in a rising trend, because the preheating temperature of the ladle is only hundreds of degrees, after the molten steel is poured into the ladle, part of heat is transferred to the ladle by the molten steel, and then the temperature is kept stable. And after the temperature is stable, the temperature of the molten steel slowly decreases along with the atomizing time.
When atomization is carried out for about 1 hour, the viscosity of the molten steel is increased due to the fact that the temperature of the molten steel is reduced at the moment, the volume of the molten steel in the steel ladle is close to the bottom, the fluidity is poor, and the aperture of a leakage hole is required to be gradually enlarged to improve the flow rate of the molten steel. When the flow rate of the molten steel increases, the temperature of the molten steel rapidly decreases (from 1641 ℃ C. To 1626 ℃ C.). Finally, when the atomization time reaches 67min, the flow rate of the molten steel is stable, the temperature of the molten steel also tends to be stable (the temperature starts to drop from 1606 ℃) until the atomization process is finished (the temperature drops to 1600 ℃).
After long-term detection of the atomization process, an atomization water pressure and molten steel temperature curve under the condition of preparing the same atomized powder particle size distribution is shown as a black square frame connecting line shown in fig. 2, nonlinear fitting under BiDoseResP model is performed on the measured values by fitting software, and the following equation is obtained:
The fitting results are shown in dashed line portions in fig. 2, where R 2 is 0.9999.
Fitting a curve relation diagram of water atomization water pressure and atomization time, and as shown in fig. 3, changing the water pressure of the stop valve of the coaxial motor into: controlling the water pressure at 17.5-17.6MPa within 0-60 min; controlling the water pressure at 17.75-18.5MPa for 60-65 min; controlling the water pressure at 19.1-20.1MPa in 65-70 min; the water pressure is controlled at 20.1-20.5MPa within 70-75 min.
The atomization water pressure-coaxial motor stop valve angle curve is shown in fig. 5, and is correlated with the water atomization water pressure in fig. 3 to obtain an atomization time-coaxial motor stop valve angle curve, wherein the coaxial motor stop valve angle is 262 degrees in 0min, the coaxial motor stop valve angle is basically 255-260 degrees in 1-49min, and the coaxial motor stop valve angle is slowly increased from 260 degrees to 260 degrees in 50-60 min; at 61-63min, the cut-off valve angle of the coaxial motor is increased from 262 degrees to 264 degrees in one degree per minute; 64min, the angle of the stop valve of the coaxial motor is 267 degrees; the angle of the stop valve of the coaxial motor is 272 degrees in 65 min; at 66min, the angle of the stop valve of the coaxial motor is 279 degrees; 67min, the angle of the stop valve of the coaxial motor is 285 degrees; the angle of the stop valve of the coaxial motor is 288.12 degrees when 68-69 min; 70-71min, wherein the angle of the stop valve of the coaxial motor is 291.71 degrees; the angle of the stop valve of the coaxial motor is 294.18 degrees when 72-73 min; and the cut-off valve angle of the coaxial motor is 296.42 degrees in 74-75 min.
According to fig. 6, after the start of the time counting, the water pressure controlled by the coaxial motor is set in a predetermined manner, and the angle is adjusted according to the atomization time, thereby adjusting the water pressure.
3) And after atomization, dehydrating and drying the powder to obtain coarse powder.
The present invention uses Mao Fenli degrees obtained at this time as a test standard, the particle size distribution of atomized powder (coarse powder) before improvement is shown in table 1, the water pressure in the atomization process is adjusted by the method of the present invention, and the particle size distribution of atomized powder (coarse powder) is shown in table 2.
TABLE 1 particle size distribution table of atomized powder (coarse powder) before improvement
TABLE 2 particle size distribution table of atomized powder (coarse powder) after improvement of the method of the invention
It can be seen by comparing the particle size distribution table of the atomized powder (coarse powder). The proportion of coarse powder with the particle size of more than 80 meshes after improvement is reduced to less than 6 percent from more than 14 percent. The fine powder with the particle size of less than 325 meshes is reduced from more than 29 percent to less than 25 percent.
The particle size of the water atomized ferrosteel powder is larger than 80 meshes, the water atomized ferrosteel powder cannot be used for powder metallurgy generally, and more than 25% of the powder with the particle size smaller than 325 meshes needs to be removed in the subsequent batch mixing process.
Therefore, the invention solves the problem of widening the particle size distribution of the powder caused by temperature reduction in the early and later stages of atomization, the water atomized steel iron powder prepared by the method has stable particle size distribution, saves the subsequent batch mixing process, improves the properties of the product such as compressibility, bulk density, fluidity and the like, and has good consistency.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and additions may be made without departing from the scope of the invention. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.
Claims (8)
1. The method is characterized in that an atomization water pressure control device adopted by the method comprises a first stop valve and a second stop valve which are connected through an atomization water pipe, wherein the first stop valve is connected with a booster pump, the second stop valve is connected with an atomization spray head, the second stop valve controls and adjusts the angle of the stop valve to finely adjust the water pressure along with the change of atomization time, and the second stop valve is a coaxial motor stop valve;
the method specifically comprises the following steps:
1) Measuring and recording the temperature of the surface of molten steel smelted by the electric furnace;
2) When atomization starts, temperature measurement is carried out on molten steel in the tundish and recording is carried out;
3) In the atomization process, measuring and recording the temperature of the tundish molten steel at regular intervals until the atomization process is finished;
4) Combining the molten steel temperature data obtained in the step 1) -step 3) with atomization time, and drawing a molten steel temperature-time curve relationship diagram;
5) Converting the temperature-time curve data into control parameters of a stepping motor in the atomizing water pressure control device according to the parameters of the atomizing water pressure control device, so that the atomizing water pressure control device adjusts the angle according to preset settings and changes along with atomizing time, thereby adjusting the water pressure, and improving the water pressure according to the decrease of the temperature of molten steel; after atomization, drying the powder to obtain coarse powder;
Wherein, along with the change of atomizing time adjustment angle does: at 0min, the angle of the stop valve of the coaxial motor is 262 degrees, at 1-49min, the angle of the stop valve of the coaxial motor is basically 255-260 degrees, and at 50-60min, the angle of the stop valve of the coaxial motor is slowly increased from 260 degrees to 260 degrees; at 61-63min, the cut-off valve angle of the coaxial motor is increased from 262 degrees to 264 degrees in one degree per minute; 64min, the angle of the stop valve of the coaxial motor is 267 degrees; the angle of the stop valve of the coaxial motor is 272 degrees in 65 min; at 66min, the angle of the stop valve of the coaxial motor is 279 degrees; 67min, the angle of the stop valve of the coaxial motor is 285 degrees; the angle of the stop valve of the coaxial motor is 288.12 degrees when 68-69 min; 70-71min, wherein the angle of the stop valve of the coaxial motor is 291.71 degrees; the angle of the stop valve of the coaxial motor is 294.18 degrees when 72-73 min; and the cut-off valve angle of the coaxial motor is 296.42 degrees in 74-75 min.
2. The method for regulating and controlling atomized water pressure based on the temperature of water atomized molten steel according to claim 1, wherein the first stop valve is a high-pressure stop valve.
3. The method for regulating and controlling the atomizing water pressure based on the temperature of the water atomized molten steel according to claim 2, wherein the angle adjustment range of the second stop valve is 255 ° -300 °.
4. The method for regulating and controlling the atomized water pressure based on the temperature of the water atomized molten steel according to claim 1, wherein the output water pressure of the first stop valve is 10-26MPa.
5. The method for regulating and controlling the atomizing water pressure based on the temperature of the water atomized molten steel according to claim 1, further comprising the step of 6): repeating the steps 1) -5) for a plurality of times, and correcting the parameters of the atomization water pressure control device according to the powder particle size distribution result to finally obtain the atomization water pressure control process parameters suitable for the water atomization steel powder atomization process.
6. The method for regulating and controlling the atomized water pressure based on the temperature of the molten steel atomized by water according to claim 1, wherein in the step 5), firstly, the curve relationship between the atomized water pressure and the molten steel temperature and the curve relationship between the molten steel temperature and the time in the step 4) are drawn, and the curve relationship between the atomized water pressure and the atomized time is fitted; and according to the curve relation between the atomizing water pressure and the angle of the second stop valve, correlating the curve relation between the atomizing water pressure and the angle of the second stop valve with the curve relation between the atomizing water pressure and the atomizing time to obtain the curve relation between the atomizing time and the angle of the second stop valve.
7. The method for regulating and controlling atomized water pressure based on the temperature of water atomized molten steel according to claim 5, wherein the output water pressure of the second stop valve is: controlling the water pressure at 17.5-17.6 MPa at 0-60 min; controlling the water pressure at 17.75-18.5 MPa at 60-65 min; controlling the water pressure at 19.1-20.1 MPa at 65-70 min; the water pressure is controlled at 20.1-20.5 MPa at 70-75 min.
8. The method for controlling the atomizing water pressure based on the temperature of the water atomized molten steel according to claim 1, wherein in the step 3), the temperature of the tundish molten steel is measured and recorded every 1-20 minutes.
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| JP3957331B2 (en) * | 1993-05-18 | 2007-08-15 | Ｊｆｅスチール株式会社 | Method for producing water atomized iron powder for powder metallurgy |
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| CN102350497A (en) * | 2011-09-16 | 2012-02-15 | 中南大学 | High-compressibility water atomization iron powder and preparation method thereof |
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