CN2432219Y - Multifunctional multiple blowing single nozzle refining furnace - Google Patents
Multifunctional multiple blowing single nozzle refining furnace Download PDFInfo
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- CN2432219Y CN2432219Y CN 00235854 CN00235854U CN2432219Y CN 2432219 Y CN2432219 Y CN 2432219Y CN 00235854 CN00235854 CN 00235854 CN 00235854 U CN00235854 U CN 00235854U CN 2432219 Y CN2432219 Y CN 2432219Y
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Abstract
The utility model relates to a liquid steel refining device, the action of which is to eliminate the disadvantages of small internal diameter of an RH nozzle, steel slag in vacuum chambers, no heating function, severious steel slag splash in the process of refining VOD, short barrel lining service life, LF/VD stove submerged arc slag overflow, bad gas removal capability, etc. A big nozzle is arranged at the lower part of the utility model, an oxygen lance is arranged at the top part of the vacuum chamber, heating devices such as an oxygen combustion mozzle, ect, are arranged at the side upper part of a furnace chamber, a nozzle is arranged at the side lower part of the furnace chamber, an argon blowing air brick is eccentrically arranged at the bottom part of a steel barrel, and a dusting device and a wire feed device are arranged. The utility model can produce IF steel of (C) < 10 ppm and various ultra-low-carbon stainless steel, wheel steel with high speed of (H) < 1.5 ppm, etc.
Description
The utility model relates to a steelmaking refining equipment
At present, China needs a large amount of thin plate steel for automobiles and household appliances, a large amount of ultra-low carbon stainless steel and high-speed wheel steel. Meanwhile, the quality of the bearing steel is also required to be further improved. However, the existing external refining equipment used at home and abroad has a series of defects.
As for IF steel, the defects of the multi-purpose RH device refining at home and abroad are as follows:
(1) the inner diameter of the suction nozzle is small, the circular flow of the molten steel is small, the improvement of refining capacity is limited, and the service life of the suction nozzle is greatly reduced due to the fact that the flow velocity of the molten steel is large and the refractory material of the suction nozzle is seriously washed.
(2) The argon bubble rising path is short and the distance for refining molten steel is short, thereby also limiting the improvement of refining capacity.
(3) In the vacuum chamber, steel slag nodulation often occurs, which not only causes recarburization of later molten steel, but also influences yield and causes the service life of refractory materials in the vacuum chamber to be reduced.
(4) The temperature of molten steel cannot be controlled without a heating function, so that the relationship between components and temperature is not easy to coordinate.
These points have led to considerable difficulties in producing IF steels with RH in which [ C]<10ppm or less.
For stainless steel, VOD and AOD production are typically employed. The defects of VOD are as follows:
(1) the splashing of steel and slag is serious in the blowing process, so that a free space of more than 1m needs to be reserved at the upper part of the steel containing barrel and the open-blown carbon content needs to be controlled to be 0.2-0.7 percent, consequently, the steel yield is reduced, the task of a primary smelting furnace is aggravated, and the use amount of cheap high-carbon ferrochrome is limited.
(2) The steel drum has a short refractory life, resulting in an increase in steel costs.
The disadvantages of using AOD are:
(1) the capacity of refining ultra-low carbon stainless steel is limited, so that the expansion of production varieties is limited.
(2) The consumption of argon is large, and the service life of the furnace lining is short, thereby causing the cost increase of steel.
Due to the above points, the method of producing stainless steel still needs to be further improved.
In the case of high-speed wheel steel and bearing steel, the production is carried out by using LF and VD furnaces, and the main problems are that:
(1) when molten steel is heated, submerged arc slag is needed, and when vacuum refining (deoxidation and degassing) is carried out under the submerged arc slag, the submerged arc slagoverflows from a steel containing barrel, so that the labor condition is extremely bad when a vacuum tank is cleaned.
(2) The molten steel surface of the LF furnace is always provided with slag, which is very unfavorable for removing gas in the steel.
Therefore, further improvements are needed in the methods of producing high speed wheel steel and bearing steel.
The specific conditions of the multifunctional combined blowing single-nozzle refining furnace are provided, and the equipment is characterized in that:
(1) the two small suction nozzles are changed into one large suction nozzle, the section of the suction nozzle is large, the circular flow of molten steel is large, the flow velocity of the molten steel is small, and the scouring force on the suction nozzle is weak, so that the service life of the suction nozzle is long.
(2) Argon blowing from the upper part of the ascending pipe is changed into argon blowing eccentrically through the air brick at the bottom of the steel containing barrel, the ascending path of argon bubbles in molten steel is long, the refining distance of the molten steel is long, and the shorter refining time can be exchanged for the longer refining distance.
(3) The molten steel with large ring flow circulates in the vacuum chamber, and because the molten steel has a large amount of heat energy and is heated by an oxygen-combustion nozzle and the like, steel and slag nodulation cannot be caused on the wall of the vacuum chamber, so that later molten steel recarburization is avoided, and the service life of a refractory material can be prolonged.
Due to the three aspects, the production of IF steel with [ C]less than 10ppm and different varieties of ultra-low carbon stainless steel by the equipment is guaranteed.
(4) When the suction nozzle is inserted into molten steel, the slag on the molten steel surface can be kept off on the annular molten steel surface outside the suction nozzle by using the inverted cone iron sheet cap, so that good conditions can be created for removing [ H], [ N]and [ O]from the molten steel inside the suction nozzle, the hot slag can be used for preventing the molten steel outside the suction nozzle from losing heat, and severe working conditions caused by overflow are eliminated.
(5) The equipment has sufficient vacuum capacity, and the molten steel (and slag) is positioned in the vacuum chamber, so that no matter how the steel slag is splashed, the molten steel (and slag) cannot overflow out of the steel containing barrel, and the problem of steel yield reduction cannot be caused.
(6) The inner diameter of the suction nozzle of the device is more than 1m, so that the spray repair is very convenient, and favorable conditions can be created for prolonging the service life of the refractory material.
(7) The equipment has a heating function, and vacuum refining and heating can be carried out synchronously, so that refining time can be saved, and favorable conditions can be created for controlling converting end points (components and temperature).
The utility model aims at being used for carrying out molten steel vacuum treatment and vacuum refining. It can be used for vacuum decarbonization, deoxidation and desulfurization, and can remove hydrogen, nitrogen and other gases and non-metallic inclusions in the steel, and can be used for producing high-quality steel and alloy with high cleanliness. The high-quality steel after vacuum refining can reach the following cleanliness level: IF steel: [C]less than 10ppm, [ N]= 20-45 ppm; stainless steel: [C]= 100-300 ppm, and the recovery rate of chromium = 93-96%; high speed wheel steel and bearing steel: TO<10ppm and [ H]<1.5 ppm.
The utility model discloses can reach: (1) the defects that the RH suction nozzle is small in inner diameter, the argon bubble rising path is short, and a vacuum chamber has steel and slag nodulation and no heating function are overcome; (2) the defects of serious steel and slag splashing and short service life of a barrel lining in the VOD converting process, and the defects of difficult converting of ultra-low carbon stainless steel by AOD, large argon consumption and short service life of a furnace lining are eliminated; (3) the method eliminates the defects of poor submerged arc slag overflow and degassing capability of LF and VD furnaces, integrates multiple functions of vacuum, stirring, heating, slag refining, powder spraying, wire feeding and the like in one device, simultaneously adopts composite blowing in the top direction, the bottom direction and the side direction to improve the decarburization speed, ensure that the end point carbon is less than 10PPm, enhance the degassing efficiency, ensure that [ H]is less than 1.5PPm and [ N]= 20-45 PPm, economically, effectively and high-quality IF steel, ultra-low carbon stainless steel and high-speed wheel steel are smelted, and further improve the quality of various steels such as bearing steel and the like.
The utility model discloses a technical scheme of multi-functional combined blowing single-nozzle refining furnace, including flourishing steel drum, barrel head argon blowing device, real empty room, vacuum pumping system, auxiliary machinery device. The vacuum chamber comprises a suction nozzle, a hearth and an upper vacuum chamber. The top of the vacuum chamber is provided with a top blowing oxygen lance, the lower part of the side wall of the hearth is provided with a side blowing nozzle, and the upper part of the side wall is provided with a heating device. The working platform adjacent to the vacuum chamber is provided with a powder spraying and wire feeding device.
The utility model discloses the ratio of real empty room's furnace internal diameter and suction nozzle internal diameter is 1.0 ~ 1.5: 1, and the suction nozzle is a drum of inside lining refractory material for insert the molten steel and refine. The inner diameter can be determined according to the capacity of the steel ladle and the convenience of operation.
The top oxygen lance of the utility model is a laval nozzle with Mach number more than 2.5, and the oxygen lance adopts a water cooling device.
The utility model discloses the side-blown nozzle is bushing type structure, and the center is the nozzle, outsourcing three-layer sheathed tube gas cooler, and the end seals, and first and third layer are the blast pipe, and the second floor is the intake pipe. The cooling gas is nitrogen, carbon dioxide gas, water vapor or compressed air.
The heating device of the utility model comprises an oxygen-burning nozzle, a plasma heating device and an induction heating device. The oxygen-combustion nozzle is arranged on the upper part of the side wall of the hearth, the fuel of the oxygen-combustion nozzle can be natural gas, producer gas or diesel oil, and the heating power is 2-30MW according to the condition that the molten steel amount in the vacuum chamber is 1/4-1/3 of the capacity of the steel-containing barrel.
The plasma heating device of the utility model has the heating power of 100-kilowatt/ton according to the molten steel amount in the vacuum chamber.
The utility model simultaneously arranges a top-blowing oxygen lance, a side-blowing nozzle (argon or oxygen) and a composite converting form of the eccentric air brick (argon blowing) at the bottom of the steel ladle on a refining furnace.
The capacity of the steel containing barrel of the utility model is 50-380 tons,the height of the vacuum chamber is 7-11m, the inner diameter of the suction nozzle is 1.0-3.2m, the inner diameter of the hearth is 1.0-4.8m, the molten steel amount in the vacuum chamber is 12-130 tons, the temperature rising speed of the molten steel is 2-5 ℃/min, the refining time is 15-45 min, the heating power is 2-30MW, and 1-9 plasma generators are arranged.
The top of the vacuum chamber of the utility model is provided with a supersonic oxygen lance, the lower part of the side of the hearth is provided with 1-3 nozzles, and the upper part of the side of the hearth is provided with 1-4 oxygen-burning nozzles. The powder spraying and wire feeding device is arranged on a proper platform close to the single-nozzle refining furnace.
The single-nozzle refining furnace of the utility model can refine a plurality of kinds of steel, and the refining process is illustrated below only by taking the IF steel, the stainless steel, the high-speed wheel steel and the bearing steel which are most needed at present as examples.
(1) IF steel:
1) vacuum argon blowing process [6]
Firstly, the phosphorus and the sulfur in the molten iron are removed to be below 100ppm by a molten iron pretreatment method, and then the carbon in the steel is removed to be 200-300ppm and the nitrogen is removed to be 20-25ppm by a converter. The oxygen content in the steel at this time was 400-500 ppm. And then the carbon content of the molten steel is reduced to below 10ppm (minimum 3ppm) in a vacuum single-nozzle refining furnace by adopting a method of eccentrically blowing argon from the bottom of a steel ladle, wherein [ H]<1.5ppm, [ N]<42ppm, and T [ O]<40 ppm. If the temperature of the molten steel is low, the temperature can be raised by adopting top blowing oxygen, a side oxygen-burning nozzle, a plasma gun and the like. The blowing end point is controlled by means of a mass spectrometer, an oxygen concentration cell and the like. Adding a proper amount of titanium, niobium and aluminum alloy into the molten steel 3-5 minutes before the refining is finished. The amount of titanium added was calculated as follows:
The treatment time of the single-nozzle refining furnace is about 15 to 45 minutes. The argon consumption is 0.01-0.15Nm3Per ton of steel.
2) Vacuum oxygen-argon blowing process
Under the condition of oxygen blowing, the carbon at the end point of the converter can be controlled to be higher, such as 500-550 ppm. As in the previous section, the phosphorus and sulfur in the molten iron are removed to below 100ppm by a molten iron pretreatment method, and then the carbon in the steel is removed to 500-550ppm and the nitrogen is removed to 20-25ppm by a converter. And then the carbon content of the molten steel is reduced to below 10ppm (minimum 3ppm) in a vacuum single-nozzle refining furnace by adopting a method of eccentrically blowing argon and top oxygen at the bottom of a steel ladle. In principle, the oxygen blowing can be stopped when the carbon is less than 200 ppm. If the decarburization speed is extremely slow when the carbon content is =20-30ppm, the decarburization speed can be enhanced by adopting a side argon blowing method. If the temperature of the molten steel is low, the molten steel can be heated by adopting a side oxygen-combustion nozzle, a plasma gun and the like. The blowing end point is controlled by means of a mass spectrometer, an oxygen concentration cell and the like. Adding a proper amount of titanium, niobium and aluminum alloy into the molten steel 3-5 minutes before the refining is finished. The treatment time of the single-nozzle refining furnace is about 15 to 45 minutes. The argon consumption is 0.01-0.15Nm3Per ton of steel.
(2) Stainless steel: when smelting stainless steel, the single-nozzle refining furnace can be in duplex connection with a converter or an electric arc furnace.
No matter how much method is used, the sulfur and phosphorus contents of the primary molten steel are all lower than 100ppm before entering the single-nozzle refining furnace. The content of molten steel blowing carbon can reach 0.6-0.7% due to the high coordination relationship between refining and continuous casting or ingot casting, and is as low as 0.05-0.1%, of course, the former has longer refining time, and the latter has shorter refining time. The contents of chromium and nickel should be in the lower limit of the specification. The molten steel decarburization can be carried out by a composite converting mode of top lance oxygen blowing, side lance oxygen blowing and eccentric argon blowing at the bottom of the steel ladle. The blowing end point is controlled by means of a mass spectrometer, an oxygen concentration cell and the like. If stainless return steel is added, oxygen-fired burners or plasma guns may also be used to accelerate melting and temperature rise. And after the end point is reached, adjusting the components of the molten steel and adding aluminum to finish refining.
(3) Bearing steel: deoxidation of bearing steel can be carried out in two ways: 1) adding aluminum for precipitation deoxidation and weak stirring
And 2) vacuum carbon deoxidation and precipitation deoxidation are combined and weakly stirred.
Before entering the single-nozzle refining furnace, the phosphorus content of the primary molten steel is less than 100 ppm. The weak stirring is carried out byblowing argon eccentrically at the bottom of the steel barrel.
(4) High-speed wheel steel: such steels can be refined in the same way as bearing steels, except that, because of the strict requirements on gas content, the highest possible vacuum and a large argon blow are used in the single-nozzle vacuum refining.
The utility model discloses before single-nozzle refining furnace carries out the refining, use oxygen earlier-burner tip to toast furnace, suction nozzle and last real empty room, make furnace and suction nozzle refractory material surface temperature reach more than 1200 ℃. The vacuum system is pumped to the required vacuum degree, then the inverted cone iron sheet slag blocking cap is arranged below the suction nozzle, the steel containing barrel containing primary molten steel is transported to the lower part of the single-nozzle refining furnace, the steel containing barrel is lifted by a hydraulic machine until the suction nozzle is inserted into the molten steel by about 300mm, the molten steel can rise to a certain height in the suction nozzle due to the pressure difference between the atmosphere and the vacuum chamber caused by the vacuum effect, and then argon is started to blow in the molten steel eccentrically from the bottom of the steel containing barrel, so that the molten steel on the side blowing in the argon is lighter and can float up to the inside of the vacuum chamber, the molten steel on the side not blowing in the argon is heavier and can sink to the bottom of the steel containing barrel, and the process is repeated to form molten steel circulation, thereby achieving the purposes of decarburization, degassing, deoxidation, inclusion removal and the like until the refining.
The drawings of the utility model explain: FIG. 1 is a schematic diagram of a longitudinal section of a system of a multifunctional combined blowing single-nozzle refining furnace.
The utility model discloses establish two stations, one is refine, and another carries out repair operations such as building refractory material.
The utility model discloses a multi-functional combined blowing single-nozzle refining device is shown in figure 1. 1-vacuum pumping system, 2-charging system, 3-upper vacuum chamber, 4-hearth, 5-suction nozzle, 6-top blowing oxygen lance, 7-side blowing nozzle, 8-oxygen-burner nozzle, 9-plasma heating device, 10-induction coil, 11-steel containing barrel, 12-powder spraying tank, 13-wire feeding machine, 14-argon blowing air brick and 15-steel containing barrel vehicle.
The capacity of the single-nozzle refining furnace is 50 tons, and the air extraction capacity of the six-stage steam jet pump under 66Pa is 300-380 kg/h. The height of the vacuum chamber is 8m, the height of the suction nozzle is 1.5m, the inner diameter of the suction nozzle is 1m, the inner diameter of the hearth is 1.3m, the height of the hearth is 1.5m, the diameter of the upper vacuum chamber is 1.0m, and the height of the upper vacuum chamber is 5 m. A top-blown oxygen lance is adopted, and the Mach number Ma is more than 2.5-3.0; the side face of the lower part of the hearth is provided with a side blowing nozzle which can spray oxygen and argon; 2 air bricks are arranged at the bottom of the steel ladle equivalent to the inner diameter 1/2 of the suction nozzle for eccentrically blowing argon, and the argon consumption is about 0.01-0.15Nm3Per ton. 4 plasma heating devices with the total power of 1.6-4.0MW are arranged along the side surface of the upper part of the hearth. The lowest platform layer close to the vacuum chamber is provided with a powder spraying and wire feeding device.
Claims (10)
1. A multifunctional refining furnace with multiple blowing and single nozzle is composed of steel drum, argon blowing unit at bottom of drum, vacuum chamber, vacuum pumping system and auxiliary mechanical unit, and features that the vacuum chamber is composed of suction nozzle, hearth and upper vacuum chamber, the top blowing oxygen gun is installed to top of vacuum chamber, the side blowing nozzles are installed to lower part of side wall of hearth, the heater is installed to upper part of side wall, and the powder spraying and wire feeding unit is installed to the working platform near vacuum chamber.
2. The single-nozzle refining furnace of claim 1, wherein the ratio of the inner diameter of the hearth of the vacuum chamber to the inner diameter of the suction nozzle is 1.0-1.5: 1, and the suction nozzle is a cylinder lined with refractory material and used for inserting molten steel for refining.
3. The single nozzle finer of claim 1, wherein the top lance is a laval nozzle with a mach number>2.5 and the lance is water cooled.
4. The single-nozzle refining furnace of claim 1, wherein the side-blown nozzles are of a sleeve-type construction, the center is the nozzle, the gas cooler is surrounded by three layers of sleeves, the end is closed, the first and third layers are exhaust pipes, and the second layer is an intake pipe. The cooling gas is nitrogen, carbon dioxide gas, water vapor or compressed air.
5. The single-nozzle refining furnace of claim 1, wherein the heating device comprises an oxygen burner, a plasma heating device and an induction heating device.
6. The single-nozzle refining furnace of claims 1 and 5, wherein the oxygen-burning nozzle is disposed on the upper portion of the side wallof the furnace, and the fuel can be natural gas, producer gas or diesel oil, and the heating power is determined to be 2-30MW according to the amount of molten steel in the vacuum chamber being 1/4-1/3 of the capacity of the steel-containing barrel.
7. The single-nozzle refining furnace as defined in claim 1, wherein the plasma heating device has a heating power of 100-300 kw/ton in accordance with the amount of molten steel in the vacuum chamber.
8. The single-nozzle refining furnace of claims 1, 3 and 4, characterized in that a top-blown lance, a side-blown (argon or oxygen) nozzle and a composite blowing form of an eccentric (argon-blown) gas permeable brick at the bottom of the steel ladle are simultaneously arranged on one refining furnace.
9. The single-nozzle refining furnace of claim 1, wherein the capacity of the steel-holding barrel is 50 to 380 tons, the height of the vacuum chamber is 7 to 11m, the inner diameter of the suction nozzle is 1.0 to 3.2m, the inner diameter of the hearth is 1.0 to 4.8m, the amount of molten steel in the vacuum chamber is 12 to 130 tons, the temperature rising speed of the molten steel is 2 to 5 ℃/min, the refining time is 15 to 30 minutes, the heating power is 2 to 30MW, and 1 to 9 plasma generators are arranged.
10. The single-nozzle refining furnace of claim 1, wherein a supersonic oxygen lance is installed at the top of the vacuum chamber, 1-3 nozzles are installed at the lower part of the furnace side, 1-4 oxygen-burning nozzles are installed at the upper part of the furnace side, and the powder spraying and wire feeding device is installed on a suitable platform near the single-nozzle refining furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00235854 CN2432219Y (en) | 2000-06-09 | 2000-06-09 | Multifunctional multiple blowing single nozzle refining furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00235854 CN2432219Y (en) | 2000-06-09 | 2000-06-09 | Multifunctional multiple blowing single nozzle refining furnace |
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| CN2432219Y true CN2432219Y (en) | 2001-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 00235854 Expired - Lifetime CN2432219Y (en) | 2000-06-09 | 2000-06-09 | Multifunctional multiple blowing single nozzle refining furnace |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320131C (en) * | 2002-11-16 | 2007-06-06 | 韦富克斯有限公司 | Method and device for cooling blowing lances |
| CN101805817A (en) * | 2010-04-30 | 2010-08-18 | 北京科大三泰科技发展有限公司 | Method for smelting ultra-low hydrogen steel by using single-nozzle refining furnace |
| CN101962701A (en) * | 2010-08-19 | 2011-02-02 | 北京科技大学 | LT-CAS (Control Automatic System) double-station vacuum refining device and process method thereof |
| CN101701279B (en) * | 2009-11-20 | 2011-04-13 | 北京科大三泰科技发展有限公司 | Method for smelting low-sulfur steel by single-mouth refining furnace |
| CN102312052A (en) * | 2011-10-18 | 2012-01-11 | 马钢(集团)控股有限公司 | Flat single-tube vacuum refining device |
| CN103045804A (en) * | 2012-12-21 | 2013-04-17 | 山西新泰钢铁有限公司 | Method for smelting stainless steel with ultra-low carbon and nitrogen content |
| CN103509913A (en) * | 2013-09-03 | 2014-01-15 | 西安前沿重型工业工程技术有限公司 | Argon-blowing oxygen-blowing molten steel refining apparatus with vacuum cap |
| CN103525982A (en) * | 2013-10-23 | 2014-01-22 | 马钢(集团)控股有限公司 | Single-dip-pipe vacuum refining device and using method thereof |
| CN104988285A (en) * | 2015-07-13 | 2015-10-21 | 北京科技大学 | Single pipe style multifunctional vacuum refining system and method thereof |
| US9809868B2 (en) | 2012-08-24 | 2017-11-07 | Magang (Group) Holding Co. Ltd. | Straight barrel type vacuum refining device and method for use the same |
| CN107964575A (en) * | 2017-01-23 | 2018-04-27 | 上海科林国冶工程技术有限公司 | Cover shape circulation vacuum degasser and its application method |
| CN108559860A (en) * | 2018-06-11 | 2018-09-21 | 江苏集萃先进金属材料研究所有限公司 | A kind of device and method for nickel-base alloy vacuum induction melting high-efficiency desulfurization |
| CN108728607A (en) * | 2018-06-04 | 2018-11-02 | 北京科技大学 | A kind of LF stoves dynamic bottom blowing CO2- Ar method of refining and device |
| CN109097526A (en) * | 2018-10-26 | 2018-12-28 | 中冶赛迪工程技术股份有限公司 | A kind of single mouth vacuum refining furnace and its method of refining with induction heating |
| CN109880973A (en) * | 2019-03-05 | 2019-06-14 | 北京科技大学 | A kind of method of RH refining process molten steel heating |
| CN113897531A (en) * | 2021-09-08 | 2022-01-07 | 三鑫重工机械有限公司 | Process for vacuum smelting of corrosion-resistant stainless steel by VOD method |
| CN115287410A (en) * | 2022-08-10 | 2022-11-04 | 中国重型机械研究院股份公司 | RH powder injection vacuum refining device and refining method thereof |
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2000
- 2000-06-09 CN CN 00235854 patent/CN2432219Y/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320131C (en) * | 2002-11-16 | 2007-06-06 | 韦富克斯有限公司 | Method and device for cooling blowing lances |
| CN101701279B (en) * | 2009-11-20 | 2011-04-13 | 北京科大三泰科技发展有限公司 | Method for smelting low-sulfur steel by single-mouth refining furnace |
| CN101805817A (en) * | 2010-04-30 | 2010-08-18 | 北京科大三泰科技发展有限公司 | Method for smelting ultra-low hydrogen steel by using single-nozzle refining furnace |
| CN101962701A (en) * | 2010-08-19 | 2011-02-02 | 北京科技大学 | LT-CAS (Control Automatic System) double-station vacuum refining device and process method thereof |
| CN102312052A (en) * | 2011-10-18 | 2012-01-11 | 马钢(集团)控股有限公司 | Flat single-tube vacuum refining device |
| US9809868B2 (en) | 2012-08-24 | 2017-11-07 | Magang (Group) Holding Co. Ltd. | Straight barrel type vacuum refining device and method for use the same |
| CN103045804A (en) * | 2012-12-21 | 2013-04-17 | 山西新泰钢铁有限公司 | Method for smelting stainless steel with ultra-low carbon and nitrogen content |
| CN103045804B (en) * | 2012-12-21 | 2014-07-02 | 山西新泰钢铁有限公司 | Method for smelting stainless steel with ultra-low carbon and nitrogen content |
| CN103509913A (en) * | 2013-09-03 | 2014-01-15 | 西安前沿重型工业工程技术有限公司 | Argon-blowing oxygen-blowing molten steel refining apparatus with vacuum cap |
| CN103525982A (en) * | 2013-10-23 | 2014-01-22 | 马钢(集团)控股有限公司 | Single-dip-pipe vacuum refining device and using method thereof |
| CN104988285A (en) * | 2015-07-13 | 2015-10-21 | 北京科技大学 | Single pipe style multifunctional vacuum refining system and method thereof |
| CN107964575A (en) * | 2017-01-23 | 2018-04-27 | 上海科林国冶工程技术有限公司 | Cover shape circulation vacuum degasser and its application method |
| CN107964575B (en) * | 2017-01-23 | 2019-12-17 | 上海科林国冶工程技术有限公司 | hood-shaped circulation vacuum degassing device and using method thereof |
| CN108728607A (en) * | 2018-06-04 | 2018-11-02 | 北京科技大学 | A kind of LF stoves dynamic bottom blowing CO2- Ar method of refining and device |
| CN108728607B (en) * | 2018-06-04 | 2019-04-12 | 北京科技大学 | A kind of LF furnace dynamic bottom blowing CO2- Ar method of refining and device |
| CN108559860A (en) * | 2018-06-11 | 2018-09-21 | 江苏集萃先进金属材料研究所有限公司 | A kind of device and method for nickel-base alloy vacuum induction melting high-efficiency desulfurization |
| CN109097526A (en) * | 2018-10-26 | 2018-12-28 | 中冶赛迪工程技术股份有限公司 | A kind of single mouth vacuum refining furnace and its method of refining with induction heating |
| CN109880973A (en) * | 2019-03-05 | 2019-06-14 | 北京科技大学 | A kind of method of RH refining process molten steel heating |
| CN113897531A (en) * | 2021-09-08 | 2022-01-07 | 三鑫重工机械有限公司 | Process for vacuum smelting of corrosion-resistant stainless steel by VOD method |
| CN113897531B (en) * | 2021-09-08 | 2022-12-13 | 三鑫重工机械有限公司 | Process for vacuum smelting of corrosion-resistant stainless steel by VOD method |
| CN115287410A (en) * | 2022-08-10 | 2022-11-04 | 中国重型机械研究院股份公司 | RH powder injection vacuum refining device and refining method thereof |
| CN115287410B (en) * | 2022-08-10 | 2023-11-03 | 中国重型机械研究院股份公司 | RH powder spraying vacuum refining device and refining method thereof |
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