GAS INJECTION NOZZLE REFRACTORY AND GAS INJECTION NOZZLE

A gas injection nozzle refractory with one or more gas injection small metal tubes buried therein has improved durability. The gas injection nozzle refractory includes a MgO-C central refractory with a small metal tube buried therein, and a MgO-C peripheral refractory surrounding the central refractory. The central refractory on a plane of the gas injection nozzle refractory has an external shape of a circle with a radius in the range of R+10 to R+150 mm concentric with a virtual circle with a minimum radius surrounding all buried small metal tubes, R mm being a radius of the virtual circle. 1. A gas injection nozzle refractory with at least one gas injection small metal tube buried in a carbon-containing refractory , the gas injection nozzle comprising:a central refractory with the at least one small metal tube buried therein, the central refractory being a MgO-C refractory with a carbon content in the range of 40% to 80% by mass, a metal Al content in the range of 3% to 8% by mass, and a mass ratio of a metal Si content to the metal Al content in the range of 0.30 to 1.0, anda peripheral refractory surrounding the central refractory, the peripheral refractory being a MgO-C refractory with a carbon content in the range of 10% to 25% by mass,wherein the central refractory on a plane of the gas injection nozzle refractory has an external shape of a circle with a radius in the range of R+10 to R+150 mm concentric with a virtual circle with a minimum radius surrounding the at least one buried small metal tube, R mm being a radius of the virtual circle.2. The gas injection nozzle refractory according to claim 1 , wherein the external shape is a circle with a radius in the range of R+40 to R+70 mm concentric with the virtual circle.3. The gas injection nozzle refractory according to claim 1 , wherein the metal Al content is in the range of 5% to 7% by mass.4. The gas injection nozzle refractory according to claim 1 , wherein the metal Al content is in the range of 5% to ...

PROCESS FOR THE PREPARATION OF HIGH ALUMINA CEMENT

High alumina cement is produced in a submerged combustion melter, cooled and ground. 1. Process for the preparation of high alumina cement comprising:introducing a solid batch material for preparation of high alumina cement into a melter;melting the solid batch material in the melter by submerged combustion to form a liquid melt;withdrawing at least a portion of the liquid melt from the melter;cooling said discharged liquid melt to obtain solidified melt; andgrinding the solidified melt to appropriate grain size.2. The process of claim 1 , wherein the melting chamber walls are cooled claim 1 , for example comprising double steel walls separated by circulating cooling liquid claim 1 , preferably water claim 1 , and are not covered by a refractory lining.3. The process of claim 1 , wherein heat is recovered from the hot fumes and/or from the cooling liquid.4. The process of wherein heat is recovered from the hot fumes to preheat the raw materials.5. The process of wherein part at least of the melt is withdrawn continuously or batchwise from the melter.6. The process of wherein the submerged burners of the melter are controlled such that the melt volume is increased by at least 8% claim 1 , preferably at least 10% claim 1 , more preferably at least 15% or 20% claim 1 , compared to the volume the melt would have with no burners firing.7. The process wherein the submerged combustion is performed such that a substantially toroidal melt flow pattern is generated in the melt claim 1 , having a substantially vertical central axis of revolution claim 1 , comprising major centrally inwardly convergent flows at the melt surface; the melt moves downwardly at proximity of the vertical central axis of revolution and is recirculated in an ascending movement back to the melt surface claim 1 , thus defining an substantially toroidal flow pattern.8. The process of wherein the melting step comprises melting the solid batch material claim 1 , in a submerged combustion melter by ...

Tuyere for a basic oxygen furnace

A tuyere comprising an inner tube including a lower section having a first diameter, an upper section having a second diameter smaller than the first diameter, and a converging transition section having a converging angle Θ from 15° to 35° connecting the lower section to the upper section, the inner tube terminating in an inner nozzle at a downstream end of the upper section; and an outer tube surrounding the inner tube so as to create an annulus there between, the outer tube including a lower section having a third diameter larger than the first diameter, an upper section having a fourth diameter smaller than the third diameter but larger than the second diameter, and a converging transition section having connecting the lower section to the upper section, the outer tube terminating in an outer nozzle at a downstream end of the upper section.

METAL MELTING APPARATUS, SCREEN PLATE FOR METAL MELTING, AND METHOD OF MELTING METAL

A metal melting apparatus capable of providing a clear melt with little oxides, even when either one or a mixture of scrap material and fresh material is supplied. Solution is provided by a metal melting apparatus including melting chamber to which a melt raw material is supplied, and gas injection system for injecting gas into melt in the melting chamber to generate a vortex of melt in the melting chamber. 1. A metal melting apparatus comprising:a melting chamber to which a melt raw material is supplied, anda gas injection system for injecting gas into melt in the melting chamber to generate a vortex of melt in the melting chamber.2. The metal melting apparatus according to claim 1 ,wherein the gas is an inert gas which is inactive to the melt.3. The metal melting apparatus according to claim 1 ,wherein the gas injection system comprises a plurality of gas injection ports to inject the gas from a plurality of locations in the melting chamber.4. The metal melting apparatus according to claim 1 ,wherein the gas is injected in an upward spiral direction along an interior wall surface of the melting chamber.5. The metal melting apparatus according to claim 1 ,wherein the melting chamber is in a part of a melt circulation channel, andwherein the melt circulated to the melting chamber is supplied to the melting chamber as a fluid for generating a vortex together with the injected gas.6. The metal melting apparatus according to claim 1 , further comprising:a supply line for supplying the melt from the melting chamber to a subsequent step, andimpacting means provided in the supply line or in the melting chamber in the vicinity of the supply line, for making an impact on unmolten melt raw material that is flowing out of the melting chamber to the subsequent step.7. The metal melting apparatus according to claim 6 ,wherein the impacting means is an interior wall of the supply line or an interior wall of the melting chamber in the vicinity of the supply line, configured to ...

ROTARY DEGASSERS AND COMPONENTS THEREFOR

Disclosed are degassers, couplings, impeller shafts and impellers for use in molten metal. One such coupling transfers gas into an impeller shaft, the coupling having a smooth, tapered internal surface to align with a corresponding surface on the impeller shaft and help prevent gas leakage and to assist in preventing damage to the impeller shaft. Improved impellers for shearing and mixing gas are also disclosed, as is a degasser including one or more of these components. 1. A shaft that cannot be threadingly connected to a corresponding coupling for use in a rotary degasser , the shaft comprising:a first end, a second end, an outer sidewall, and an inner passage for transferring gas, wherein the first end is tapered and not threaded, and one or more grooves that are not threads formed adjacent the tapered first end; wherein the shaft is configured to be received in the corresponding coupling so that the tapered first end mates with an inner tapered portion in the coupling, and one or more retainers are received in the coupling such that each is positioned to be pressed against one of the one or more grooves, in order to apply driving force from the coupling to the shaft; wherein the shaft has a outer portion between the first end and the second end and the one or more grooves is between the center portion and the tapered part of the first end.2. The shaft of that has a plurality of grooves.3. The shaft of wherein the grooves are not vertically aligned.4. The shaft of wherein the at least one groove is vertical.5. The shaft of wherein the at least one groove is circular.6. The shaft of wherein at least two of the plurality of grooves are each configured to align with an opening on the coupling.7. The shaft of wherein the second end of the shaft is threaded.8. The shaft of wherein the second end of the shaft is configured to threadingly connect to a rotor.9. The shaft of wherein the taper is at an angle between 20° and 45°.10. The shaft of wherein the one or more ...

DEGASSER SNORKEL WITH SERPENTINE FLOW PATH COOLING

A snorkel () having a double shell core () that defines an annular gap () between the shells and that has an array of baffles () arranged in the annular gap to define a serpentine flow path for cooling gases that pass through the annular gap. In an embodiment, a snorkel includes a flange () that defines an internal passageway () such that the fluid pathway through annular gap () includes passage of cooling medium through internal passageway (). 1. A snorkel for use with a reaction vessel for degassing molten metal , said snorkel comprising:a first shell having an upper edge and a lower edge, said first shell defining a closed an outer surface and a closed an inner surface between said upper and lower edges;a second shell having an upper edge and a lower edge, said second shell defining a closed an outer surface and a closed an inner surface between said upper and lower edges, said second shell being oriented outside said first shell with the outer surface of said first shell opposing the inner surface of said second shell to define an annular gap therebetween, said second shell having an inlet opening and an outlet opening that are in fluid communication with said annual gap;a first refractory lining that is secured to the interior surface of said first shell;a second refractory lining that is secured to the outer surface of said second shell;an array of baffles, each baffle in said array of baffles being located in said annular gap between the outer surface of said first shell and the inner surface of said second shell and being located at a different respective longitudinal position of said annular gap, longitudinally adjacent baffles in said array cooperating with the outer surface of said first shell and the inner surface of said second shell to define at least first and second passageways, said inlet opening being in fluid communication with said outlet opening through said first passageway in series with said second passageway, at least one of said baffles ...

MULTIPLE CHAMBER MATERIAL-STIRRING LANCE AND METHOD

A multiple chamber material-stirring lance and method used to treat molten metal in a ladle, the lance having a stirring gas chamber, and a plurality of gas permeable ports arranged at a terminal end of the gas chamber, and at least one material chamber positioned parallel to the gas chamber and terminating in a plurality of material ports. In use, the multiple chamber material-stirring lance is lowered into the ladle of molten metal, and gas and material are both introduced into a respective chamber and emitted through their respective ports. Stirring gas emitted through the gas permeable ports under a gas pressure between 40 and 600 cfm causes the stirring gas to create a boiling effect in the molten metal, drawing material into the stirring gas bubbles and away from the lance body, improving material dispersion efficiency and thus impurity extraction from the molten metal. 14026. A multiple chamber material-stirring lance () for use in a ladle () containing a quantity of hot metal () , the multiple chamber material-stirring lance comprising:{'b': '48', 'a gas chamber () having a first end and a terminal end, and a length between the first end and the terminal end;'}{'b': '44', 'a gas connection pipe () at the first end;'}{'b': 52', '48', '40, 'at least one lower port () formed into the length and leading out of the terminal end of the gas chamber () to an exterior of the multiple chamber material-stirring lance ();'}{'b': 43', '42', '60, 'a material chamber () having at a first end a material connection pipe () and at a second end terminating in at least one material discharge port (); and'}{'b': '46', 'a refractory coating () encasing both the gas chamber and the material chamber so as to form a single lance body;'}{'b': 43', '48, 'wherein the material chamber () is parallel to the gas chamber ();'}{'b': '52', 'wherein the lower ports () are gas permeable structures that restrict and regulate a flow of gas out of the gas chamber; and'}wherein the gas permeable ...

PROCESS FOR THE PREPARATION OF HIGH ALUMINA CEMENT

High alumina cement is produced in a submerged combustion melter, cooled and ground. 1. Process for the preparation of high alumina cement comprising:introducing a solid batch material for preparation of high alumina cement into a melter;melting the solid batch material in the melter by submerged combustion to form a liquid melt;withdrawing at least a portion of the liquid melt from the melter;cooling said discharged liquid melt to obtain solidified melt; andgrinding the solidified melt to appropriate grain size.2. The process of claim 1 , wherein the melting chamber walls are cooled comprising double steel walls separated by circulating cooling liquid claim 1 , and are not covered by a refractory lining.3. The process of claim 1 , wherein heat is recovered from the hot fumes and/or from the cooling liquid.4. The process of wherein heat is recovered from the hot fumes to preheat the raw materials.5. The process of wherein part at least of the melt is withdrawn continuously or batchwise from the melter.6. The process of wherein the submerged burners of the melter are controlled such that the melt volume is increased by at least 8% compared to the volume the melt would have with no burners firing.7. The process of wherein the submerged combustion is performed such that a substantially toroidal melt flow pattern is generated in the melt claim 1 , having a substantially vertical central axis of revolution claim 1 , comprising major centrally inwardly convergent flows at the melt surface; the melt moves downwardly at proximity of the vertical central axis of revolution and is recirculated in an ascending movement back to the melt surface claim 1 , thus defining a substantially toroidal flow pattern.8. The process of wherein the melting step comprises melting the solid batch material claim 1 , in a submerged combustion melter by subjecting the melt to a flow pattern which when simulated by computational fluid dynamic analysis shows a substantially toroidal melt flow ...

method for refining a stainless steel sheet with low nitrogen

본 발명은 10-12%크롬 함유 스테인레스강의 질소를 효율적으로 제거하기 위한 방법으로, AOD에서의 아르곤 부족 문제를 해결하고, 질소 농도를 낮추기 위해 아래와 같이 AOD정련로와 진공 설비를 순차적으로 이용하는 것을 특징으로 하는 저질소 스테인레스강의 정련 방법으로써, 먼저, AOD 정련로에서 시작 탄소 농도를 1.3 중량% 이상으로 하고, 탄소농도 0.3%까지는 질소를 불활성 가스로 사용하며, 탄소농도 100ppm이하까지는 아르곤을 사용하여 탄소를 제거하며, 질소농도를 250ppm이하가 되도록 한다. 그리고 진공정련에서는 1660 o C이상의 용강중에 Al농도가 0.05-0.1%이 되도록 첨가하고, 10mbar이하의 진공조건에서 래들 바닥으로부터 8.5-12.5l/min/t의 아르곤 가스를 취입하여 10-13분간 용강을 교반시킴으로써 질소를 제거하는 저질소 스테인레스강의 정련방법을 요지로 한다. The present invention is a method for efficiently removing nitrogen in 10-12% chromium-containing stainless steel, to solve the problem of argon deficiency in AOD, and to sequentially use the AOD refining furnace and vacuum equipment as follows to reduce the nitrogen concentration. As a method for refining low-nitrogen stainless steel, the starting carbon concentration is 1.3% by weight or more in an AOD refining furnace, nitrogen is used as an inert gas up to 0.3% carbon concentration, and argon is used up to 100 ppm carbon concentration. Remove the nitrogen concentration to 250ppm or less. In vacuum refining, the Al concentration is added to 0.05-0.1% in molten steel of 1660 o C or more, and molten steel of 8.5-12.5 l / min / t is blown from the bottom of the ladle under a vacuum condition of 10 mbar or less for 10-13 minutes. The method of refining low nitrogen stainless steel which removes nitrogen by stirring is made into the summary.

Method for Improving Cleanliness and Desulfurization Efficiency of Molten Steel

본 발명은 전로출강~2차정련 과정에서 고청정의 저류 용강 제조방법에 관한 것으로, 전로출강중에 적절한 양의 알미늄을 투입하고, 버블링 공정에서 아르곤 가스의 취입량을 적절히 제어하고, 버불링시 발생되는 나탕부위에 탈산재인 알미늄과 부원료인 생석회 및 형석등을 소량 연속 투입함으로써 고청정의 저류 용강을 제조할 수 있는 방법을 제공하고자 하는데, 그 목적이 있는 것이다. The present invention relates to a method for manufacturing a high-purity storage molten steel in the converter steel refining process, the appropriate amount of aluminum in the converter steel casting, and control the amount of argon gas in the bubbling process, The purpose of the present invention is to provide a method for producing a high-purity molten steel by continuously adding a small amount of deoxidizing material and quick raw material such as quicklime and fluorspar to the generated sludge. 본 발명은 전로에서 정련된 용강을 레이들로 출강하고, 레이들내의 용강에 아르곤 가스를 취입하여 용강을 버블링하는 공정을 포함하여 저류 용강을 제조하는 방법에 있어서, 레이들내 용강의 용해알미늄의 함량이 0.01~0.03중량%가 되도록 상기 전로출강중에 탈산재인 알미늄을 투입하고; 상기 아르곤 가스의 취입유량은 1.5~10.0Nl/min로 설정하고; 그리고 상기 버블링시 발생되는 나탕부위에, 탈산재인 알미늄을 용강 1톤에 대하여 0.06~0.12kg 연속 분할 투입하고, 그리고 부원료인 생석회 및 형석을 용강 1톤에 대하여 각각 1~8kg 및 0.2~0.6kg을 연속 분할 투입하는 것을 특징으로 하는 고청정의 저류 용강의 제조방법을 그 요지로 한다. The present invention relates to a method of manufacturing a molten steel in a ladle, including the step of tapping a molten steel refined in a converter into a ladle and blowing argon gas into the molten steel in the ladle. Into the converter steel so that the content of 0.01 to 0.03% by weight of the deoxidizer aluminum is added; The blowing flow rate of the argon gas is set to 1.5 to 10.0 Nl / min; In the bubbling part generated during the bubbling, aluminum is deoxidized continuously in a ratio of 0.06 to 0.12 kg based on 1 ton of molten steel, and 1 to 8 kg and 0.2 to 0.6 of quicklime and fluorspar, respectively, are used for 1 ton of molten steel. The summary of the method is a method of producing a high-purity molten steel, which is characterized by continuously feeding kg. 청정, 저류, 용강, 정련, 알미늄, 부원료, 버블링 Clean, storage, molten steel, refining, aluminum, subsidiary materials, bubbling

Nozzle device for electric furnace

전기로용 노즐장치에 대한 발명이 개시된다. 개시된 전기로용 노즐장치는: 냉각수가 이동되는 통로를 형성하는 냉각관로부와, 냉각관로부의 내측에 설치되어 산소가 이동되는 통로를 형성하는 공급관로부 및 공급관로부를 따라 이동되는 산소를 양측으로 분기시키는 통로를 형성하는 노즐관로부를 구비하는 것을 특징으로 한다. Disclosed is a nozzle apparatus for an electric furnace. The disclosed nozzle apparatus for an electric furnace includes: a cooling conduit section for forming a passage through which cooling water is moved, and a supply pipe section for forming a passage through which the oxygen is moved, provided inside the cooling conduit section, and oxygen moved along the supply conduit section on both sides. It characterized in that it comprises a nozzle pipe portion for forming a passage to make.

Refining method for steel sheet manufacturing

본 발명은 소형모터 철심용 소재 등으로 쓰이는 무방향성 전기강판을 연속주조하기 위한 용강정련방법의 개선에 관한 것으로, 특히 목표 성분을 갖는 용강을 고품위로 정련해낼 수 있으면서 용강 온도를 효율적으로 승온시켜 연속주조성을 향상시키도록 하는 전기강판제조용 용강정련방법에 관한 것으로서, 처리대상 용강이 수용되는 레이들(5)과, 이의 상부에 배치된 진공조(1)를 구비하는 진공탈가스 장치에서 진공감압 및 환류가스 공급하에 용강의 탈가스, 개재물 분리부상, 성분제어를 실시하는 용강정련에 있어서, 상기 진공조(1)를 감압함과 동시에 불활성의 환류가스를 공급하여 레이들 내의 용강을 환류시킴과 동시에 합금철 투입구(8)를 통하여 Fe-P 합금철을 투입하여 용강의 성분조정을 실시하는 단계와; 상기 용강의 성분조정이 완료되면, 산소취입노즐(7)을 통해 산소를 취입하여 용강 중 산소농도가 400ppm 이상 확보되면 합금철 투입구(8)를 통하여 용강 톤당 1∼3kg의 Al을 분할 투입하여 용강온도를 승온시켜 탈탄하는 단계와; 상기 용강의 탈탄이 완료되면, 용강에 합금철 투입구(8)를 통하여 Fe-Si를 투입하여 환류가스에 의해 충분히 환류시켜 개재물을 분리 부상시키면서 완전 탈산하는 단계로 구성되는 특징으로 하는 전기강판제조용 용강정련방법을 제공한다. The present invention relates to the improvement of the molten steel refining method for continuous casting of non-oriented electrical steel sheet used for small motor iron core material, and the like, in particular, while the molten steel having the target component can be refined to high quality, the temperature of the molten steel can be efficiently raised to continuous The present invention relates to a molten steel refining method for manufacturing steel sheet to improve castability, comprising: a vacuum degassing apparatus in a vacuum degassing apparatus having a ladle (5) accommodating molten steel to be treated and a vacuum tank (1) disposed thereon; In molten steel refining which performs degassing, inclusion separation, and component control of molten steel under reflux gas supply, the vacuum chamber 1 is depressurized and inert reflux gas is supplied to reflux molten steel in the ladle. Injecting Fe-P alloy through the ferroalloy inlet 8 to adjust the composition of the molten steel; When the adjustment of the composition of the molten steel is completed, the oxygen is blown through the oxygen injection nozzle (7) and when the oxygen concentration in the molten steel is secured more than 400ppm molten steel by dividing 1 ~ 3kg of Al per ton of molten steel through the ferroalloy (8) Raising the temperature to decarburize; ...

Method of melting and reducing iron raw material containing iron oxide and electric furnace

이 전기로는, 1개 이상의 상부 전극과, 1개 이상의 저취 송풍구와, 임펠러를 구비하는 기계식 교반기와, 산화철 함유 철원료를 투입하는 투입 장치를 구비한다. This electric furnace includes at least one upper electrode, at least one low-odor tuyere, a mechanical stirrer having an impeller, and an input device for introducing an iron oxide-containing iron raw material.

A method for manufacturing high chrome ferrite stainless steel

본 발명은 고크롬 페라이트계 스테인레스강의 제조에 관한 것이며; 그 목적은 고크롬 함유 스테인레스 용강을 탈산과정없이 조탈탄과 동시에 탈류를 행하므로써 탈류효율을 높이면서도 용강중의 흡질을 방지하는 효과적인 제강 정련을 통해 고크롬 페라이트계 스테인레스강을 제조할 수 있는 방법을 제공하고자 함에 있다. The present invention relates to the production of high chromium ferritic stainless steel; The purpose is to provide a method for producing high chromium ferritic stainless steel through effective steel refining to prevent desorption in molten steel while improving the degassing efficiency by simultaneously degassing the high chromium-containing stainless steel without deoxidation with crude decarburization. To be. 상기 목적달성을 위한 본 발명은 고크롬 페라이트계 스테인레스강을 제조하는 방법에 있어서, 탄소농도를 2.0중량% 이상으로 유지한 용강을 AOD에 장입하고, 상기 AOD공정에서 탈탄초기에 슬래그의 염기도를 적어도 4.0 이상으로 유지한 다음, 상기 슬래그에 용강톤당 형석을 9.0~11.0Kg를 투입한 후, 2~3분간 교반가스를 취입 교반하여 조탈탄 및 탈류정련하는 1차 정련과정을 종료하는 단계; 및 상기 1차 정련이 종료된 용강을 출강한 후 VOD공정에서 탈탄정련하는 단계;를 포함하여 구성되는 고크롬 페라이트계 스테인레스강의 제조방법에 관한 것을 그 기술적 요지로 한다. In the present invention for achieving the above object, in the method for producing a high chromium ferritic stainless steel, the molten steel having a carbon concentration of 2.0% by weight or more is charged to the AOD, and at least the basicity of the slag at the initial stage of decarburization in the AOD process. Maintaining at 4.0 or more, and after the injection of 9.0 ~ 11.0Kg of fluorspar per ton of molten steel into the slag, blowing the stirring gas for 2 to 3 minutes to terminate the first refining process of crude decarburization and deflow refining; And decarburizing and refining in a VOD process after tapping the molten steel after the first refining is completed, and the technical gist of the method for manufacturing a high chromium ferritic stainless steel comprising the same.

Methods for dissolving and reducing electric furnaces and iron oxide-containing iron raw materials

Method for manufacturing the ferritic stainless steel improved the equiaxed structure ratio thereof

본 발명은 전기로에서 중량%로 0.0040~0.0150% C, 11~19% Cr, 0.2~0.5% Mn, 0.2~0.6% Si, 0.0030~0.0120% N, 기타 Fe 및 불순물을 함유하는 페라이트계 스테인레스용강을 제조하는 단계와; 상기 스테인레스용강을 에오디(AOD) 정련로에서 정련하는 단계와; 정련처리된 스테인레스용강을 래들에서 가스교반시키는 단계와; 가스교반처리된 스테인레스용강을 연속주조하는 단계로 이루어진 페라이트계 스테인레스강 제조방법에 관한 것으로서, 상기 에오디 정련로에서는 Si 탈산을 실시하고; 상기 래들에서는 가스교반전에 0.01%~0.06% Al을 투입하여 Al 탈산을 실시하고, 4~15ppm의 칼슘합금을 첨가하고, (C+N)의 6~12배로 Ti를 첨가하여; 주편내 산화물 크기는 1~16㎛로 제어하고, 산화물 개수는 30~60개/(50×100)mm 2 로 제어하고, 질화물 크기는 1~5㎛로 제어하는 것을 특징으로 하므로, 주편내 등축정율을 향상시켜 내리징성을 개선시킬 수 있다. The present invention relates to a ferritic stainless steel containing 0.0040-0.0150% C, 11-19% Cr, 0.2-0.5% Mn, 0.2-0.6% Si, 0.0030-0.0120% N, other Fe and impurities by weight in an electric furnace. Manufacturing step; Refining the molten stainless steel in an AOD refining furnace; Gas stirring the refined stainless steel in a ladle; A method for manufacturing a ferritic stainless steel comprising continuously casting gas stirred stainless molten steel, wherein the oxidizing furnace is subjected to Si deoxidation; In the ladle, Al deoxidation is performed by adding 0.01% to 0.06% of Al before gas stirring, 4 to 15 ppm of calcium alloy is added, and Ti is added 6 to 12 times (C + N); Since the oxide size in the slab is controlled to 1 to 16 µm, the number of oxides is controlled to 30 to 60 particles / (50 × 100) mm 2 , and the nitride size is controlled to 1 to 5 µm. It is possible to improve the lowering rate by improving the yield. 내리징성, 에오디 정련로, 래들, 산화물 Easing, Edi Refining Furnace, Ladle, Oxide

Metal bath stirring method and furnace installation

Изобретение относится к области металлургии и может быть использовано при перемешивании ванны металла в металлургической емкости. В ванну металла вводится продувочный газ, в котором продувочный газ вводят в ванну металла через упорядоченно расположенные места ввода газа в металлургической емкости таким образом, что ванна металла приобретает заданное направленное течение, при этом для создания и/или поддержания заданного направленного течения осуществляют управление или регулирование ввода продувочного газа, так что протекающее количество (Q) продувочного газа имеет импульсную, пульсирующую или пильчатую зубчатую кривую зависимости от времени, причем картину течения ванны металла определяют с использованием измерительного устройства, причем измерительное устройство включает в себя по меньшей мере одно из следующего: датчик вибрации, ультразвуковой датчик, оптоэлектронный сенсор. Изобретение позволяет избежать повреждения печной установки за счет предотвращения вибрации при продувке ванны металла газом. 2 н. и 10 з.п. ф-лы, 4 ил. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 697 117 C2 (51) МПК C21C 5/35 (2006.01) F27D 27/00 (2010.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК C21C 5/35 (2013.01); F27D 27/00 (2013.01) (21)(22) Заявка: 2016137139, 21.01.2015 (24) Дата начала отсчета срока действия патента: Дата регистрации: 12.08.2019 19.02.2014 EP 14155804.9 (43) Дата публикации заявки: 22.03.2018 Бюл. № 9 (45) Опубликовано: 12.08.2019 Бюл. № 23 (56) Список документов, цитированных в отчете о поиске: RU 2378389 С2, 10.01.2010. EP 162949 A1, 04.12.1985. RU 2330278 С2, 27.07.2008. SU 1604165 А3, 30.10.1990. RU 2208054 С1, 10.07.2003. (85) Дата начала рассмотрения заявки PCT на национальной фазе: 19.09.2016 2 6 9 7 1 1 7 EP 2015/051114 (21.01.2015) C 2 C 2 (86) Заявка PCT: R U (73) Патентообладатель(и): ПРАЙМЕТАЛЗ ТЕКНОЛОДЖИЗ АУСТРИА ГМБХ (AT) 2 6 9 7 1 1 7 Приоритет(ы): (30) Конвенционный приоритет: R U 21.01.2015 (72) ...

Tuyere for a basic oxygen furnace

통풍구는, 내부 튜브로서, 제1 직경을 갖는 하부 섹션, 제1 직경보다 작은 제2 직경을 갖는 상부 섹션, 및 하부 섹션을 상부 섹션에 연결하는 수렴 각도 Θ가 15° 내지 35°인 수렴 전이 섹션을 포함하고, 상부 섹션의 하류 단부에서 내부 노즐에서 종결되는 내부 튜브; 및 사이에 고리를 생성하도록 내부 튜브를 둘러싸는 외부 튜브로서, 제1 직경보다 큰 제3 직경을 갖는 하부 섹션, 제3 직경보다 작지만 제2 직경보다는 큰 제4 직경을 갖는 상부 섹션 및 하부 섹션을 상부 섹션에 연결하는 수렴 전이 섹션을 포함하고 상부 섹션의 하류 단부에서 외부 노즐에서 종결되는 외부 튜브를 포함한다. The vent includes, as an inner tube, a lower section having a first diameter, an upper section having a second diameter smaller than the first diameter, and a converging transition section having a convergence angle Θ connecting the lower section to the upper section of 15° to 35° an inner tube terminating at the inner nozzle at the downstream end of the upper section; and an outer tube surrounding the inner tube to create a loop therebetween, the lower section having a third diameter greater than the first diameter, an upper section having a fourth diameter less than the third diameter but greater than the second diameter, and a lower section an outer tube comprising a converging transition section connecting to the upper section and terminating at an outer nozzle at a downstream end of the upper section.

Patent RU2016137139A3

ВИ“? 2016137139” АЗ Дата публикации: 25.09.2018 Форма № 18 ИЗ,ПМ-2011 Федеральная служба по интеллектуальной собственности Федеральное государственное бюджетное учреждение ж 5 «Федеральный институт промышленной собственности» (ФИПС) ОТЧЕТ О ПОИСКЕ 1. . ИДЕНТИФИКАЦИЯ ЗАЯВКИ Регистрационный номер Дата подачи 2016137139/02(058379) 21.01.2015 РСТ/ЕР2015/051114 21.01.2015 Приоритет установлен по дате: [ ] подачи заявки [ ] поступления дополнительных материалов от к ранее поданной заявке № [ ] приоритета по первоначальной заявке № из которой данная заявка выделена [ ] подачи первоначальной заявки № из которой данная заявка выделена [ ] подачи ранее поданной заявки № [Х] подачи первой(ых) заявки(ок) в государстве-участнике Парижской конвенции (31) Номер первой(ых) заявки(ок) (32) Дата подачи первой(ых) заявки(ок) (33) Код страны 1. 14155804.9 19.02.2014 ЕР* Название изобретения (полезной модели): [Х] - как заявлено; [ ] - уточненное (см. Примечания) СПОСОБ ПЕРЕМЕШИВАНИЯ ВАННЫ МЕТАЛЛА И ПЕЧНАЯ УСТАНОВКА Заявитель: ПРАЙМЕТАЛЗ ТЕКНОЛОДЖИЗ АУСТРИА ГМБХ, АТ 2. ЕДИНСТВО ИЗОБРЕТЕНИЯ [Х] соблюдено [ ] не соблюдено. Пояснения: см. Примечания 3. ФОРМУЛА ИЗОБРЕТЕНИЯ: [Х] приняты во внимание все пункты см. п см. Примечания [ ] приняты во внимание следующие пункты: [ ] принята во внимание измененная формула изобретения (см. Примечания) 4. КЛАССИФИКАЦИЯ ОБЪЕКТА ИЗОБРЕТЕНИЯ (ПОЛЕЗНОЙ МОДЕЛИ) (Указываются индексы МПК и индикатор текущей версии) С21С 5/35 (2006.01) Е270 27/00 (2010.01) 5. ОБЛАСТЬ ПОИСКА 5.1 Проверенный минимум документации РСТ (указывается индексами МПК) С21С 5/00, 5/35, 5/46, 5/48, Е27Р 27/00, Е27В 3/00, 3/28 5.2 Другая проверенная документация в той мере, в какой она включена в поисковые подборки: 5.3 Электронные базы данных, использованные при поиске (название базы, и если, возможно, поисковые термины): Езрасепек, ]-Р]а(Раё, К-РТОМ, Рабеагсв, КОРТО, ИЗРТО 6. ДОКУМЕНТЫ, ОТНОСЯЩИЕСЯ К ПРЕДМЕТУ ПОИСКА Кате- Наименование документа с указанием (где необходимо) частей, ...

Method for refining steel containing ultra-low carbon and ultra-low nitrogen

PURPOSE: Provided is a method for refining molten steel more efficiently containing ultra-low carbon and ultra-low nitrogen by promoting decarburizing and denitriding reactions even in the low concentration region of carbon and nitrogen when vacuum treating or reduced pressure treating molten steel treated in the steelmaking process. CONSTITUTION: In a method for refining molten steel by refluxing molten steel contained in ladle(1) through vacuum tank(2) to which ascension pipe(2a) and descension pipe(2b) are adhered and injecting flux into molten steel from a flux injection tank(3) connected to one side of the vacuum tank by double pipe(3a), the method for refining steel containing ultra-low carbon and ultra-low nitrogen is characterized in that the flux is prepared by mixing at least one or more of powders selected from iron ore, manganese ore and mill scale with limestone powder in a mixing ratio of 6:4 to 7:3, the powders mixed are adjusted to a particle size corresponding to a sieve size of 200 meshes or less, and the flux along with an inert gas are injected onto an upper part of molten steel or into molten steel through the double pipe.

A kind of side-blown spray gun and application method of smelting furnace

一种熔炼炉用的侧吹喷枪及使用方法，属于侧吹喷枪及使用方法。侧吹喷枪的集气筒内有可燃气室和压缩冷却空气室；在集气筒上连接有可燃气入口、氧气入口和压缩冷却空气入口，氧气入口位于集气筒的一端，可燃气入口和压缩冷却空气入口对应连接在可燃气室和压缩冷却空气室位置；氧气管穿在可燃气管内，氧气管和可燃气管均穿在压缩冷却空气管内，各气管之间均有间隙；氧气管穿过集气筒连接在氧气入口位置的集气筒上，并与氧气入口相通；可燃气管穿过集气筒连接在可燃气室与压缩冷却空气室之间的隔断上；压缩冷却空气管连接在集气筒的最下端；另一端为喷枪的输出气端。优点：使用寿命长，结构简单，成本低，操作方便；熔池搅拌动力强、效果好，能耗低。

How to prevent reoxidation of ultra low carbon steel

본 발명은 극저탄소강의 재산화 방지방법에 관한 것으로, 특히 제강공정에서 탄소성분이 70ppm 이하인 극저탄소강의 재산화를 방지하여 청정성이 우수한 극저탄소강을 정련하기 위한 방법에 관한 것이다. The present invention relates to a method for preventing reoxidation of ultra low carbon steel, and more particularly, to a method for refining ultra low carbon steel having excellent cleanability by preventing reoxidation of ultra low carbon steel having a carbon content of 70 ppm or less in a steelmaking process. 본 발명은 전로로부터 미탈산상태로 용강을 레이들로 출강하는 단계와; 레이들을 분체를 취입할 수 있는 정련설비(PI)로이송하는 단계와; 용강에 렌스를 침적시켜 CaO, CaCO 3 , Ca(OH) 2 등 CaO계 분체를 취입하는 단계와; 용강을 RH설비로 이송하여 탈탄정련하고, 탈산 및 환류시키는 단계와; 로 이루어진 하는 극저탄소강의 재산화 방지방법을 요지로 한다. The present invention comprises the steps of tapping the molten steel ladle in the non-deoxidation state from the converter; Transferring the ladle to a refining plant (PI) capable of blowing powder therein; Immersing a lance in molten steel to blow CaO-based powders such as CaO, CaCO 3 , and Ca (OH) 2 ; Transferring molten steel to an RH facility for decarburization, deoxidation and refluxing; The method to prevent re-oxidation of ultra-low carbon steel is made. 본 발명에 의하면, 극저탄소강의 재산화를 억제시켜 강의 청정도를 향상시킬 뿐 아니라 연속주조시 노즐 클로깅을 방지하고 알루미늄의 절감효과를 얻을 수 있게 하는 것이다. According to the present invention, it is possible to suppress the reoxidation of the ultra low carbon steel to improve the cleanliness of the steel as well as to prevent nozzle clogging during continuous casting and to obtain the effect of saving aluminum.

A Method for Producing Finely Dispersed Oxides Steel with high calcium content

본 발명은 전로~2차정련공정에서 전로 출강중 탈산재를 투입할때 용해산소가 수십ppm(피피엠)이 잔류되도록 하고, 레이들 정련공정 중 먼저 티타늄(Ti) 금속을 투입하여 용강내 미세 티타늄 산화물을 분산시킨 상태에서 칼슘을 함유하는 합금 또는 금속(Ca)을 분말 또는 와이어(Wire)를 취입 또는 와이어피딩을 실시하여 칼슘 함량이 높은 용강의 개재물 미세분산강의 제조방법에 관한 것이다. 본 발명은 내해수용 구조용강과 같은 고급강의 대량 생산과 동시에 용강의 품질향상은 물론 안정적 제조를 통해 용강 제조 원가를 크게 낮추는 효과를 제공함에 따라 생산성 향상 및 작업성이 개선되는 부수적인 효과도 얻을 수 있다 전로, 정련, 출강 칼슘, 용해산소, 버블링, 티탄 In the present invention, when the deoxidizer is added to the converter during the secondary refining process, dozens of ppm (PM) are left in the dissolved oxygen, and titanium (Ti) metal is first introduced during the ladle refining process. The present invention relates to a method for producing an inclusion finely-dispersed steel of molten steel having a high calcium content by blowing or wire feeding an alloy or metal (Ca) containing calcium in a state in which an oxide is dispersed. The present invention provides the effect of improving the quality of molten steel as well as improving the quality of molten steel and greatly reducing the cost of manufacturing molten steel through the stable production at the same time as the mass production of high-grade steel, such as structural steel for seawater, can also obtain the secondary effect of improving productivity and workability have Converter, refining, tapping calcium, dissolved oxygen, bubbling, titanium

Desulfurization of the molten steel for tire-cord

본 발명은 타이어코드용 용강 탈류 방법에 관한 것으로, 탄소(C) 0.70~0.92 중량%, 실리콘(Si) 0.17~0.25 중량%, 망간(Mn) 0.45~0.55 중량%, 용해 알루미늄(Sol.Al) 0.001 중량% 이하, 인(P) 0.013 중량% 이하, 황(S) 0.007 중량% 이하, 질소(N) 0.004 중량% 이하를 함유하는 타이어코드강을 래들 퍼너스에서 제조함에 있어서, 용강중 황이 타이어코드강의 규제치인 0.007 중량% 보다 0.002~0.003 중량% 높은 경우에 즉시 승온작업을 실시하여 적정한 용강 온도를 확보한 후 아르곤에 의한 용강 강교반을 실시하여 형성되는 용강의 나탕부위에 알루미늄과 형석을 투입하여 슬래그와 용강계면에서 국부적으로 SiO 2 및 FeO를 환원시켜 탈류조건과 유동성이 좋은 고염기성 슬래그를 조재하여 빠른속도로 용강 탈류를 유도하는 것을 특징으로 하는 타이어코드용 용강 탈류 방법을 요지로 한다. 래들퍼너스, 용강탈류, 나탕, 2차정련

Method of mixing steel in ladle

Изобретение относится к обработке стали в ковше в черной металлургии. Способ перемешивания включает продувку стали снизу газом или газопорошковой смесью через предусмотренные продувочные устройства, по меньшей мере одно из которых смещено от продольной оси ковша в сторону его стенки. Осуществляют перемещение относительно стали продувочных устройств в горизонтальной плоскости путем качательного вращения ковша относительно его продольной оси. Величину перемещения продувочных устройств (угла качательного вращения ковша) назначают в зависимости от размещения предусмотренных продувочных устройств в днище ковша: от не менее одной четверти оборота ковша до не менее одного оборота ковша. Технический результат - обеспечение подачи газа или газопорошковой смеси с охватом всего объема стали в ковше для осуществления максимального перемешивания стали в ковше, повышение качества стали за счет ее высококачественного очищения от мелких включений оставшихся в объеме стали после продувки, расширение технологических возможностей. 4 з.п. ф-лы, 11 ил. от916гс пы сэ РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (19) ВИ "” 2 197 540 ' 13) С2 5 МК’ С 21С 7/072, В 220 1/00 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 2001110779/02, 24.04.2001 (24) Дата начала действия патента: 24.04.2001 (46) Дата публикации: 27.01.2003 (56) Ссылки: Инжекционная металлургия. Перевод с англ. под ред. Сидоренко М.В. - М.: Металлургия, 1986, с.142-143, рис.12. $9 557867, 13.06.1977. КЦ 2023017 СЛ, 15.11.1994. 54 1044638 А, 30.09.1983. $4 629889, 28.08.1978. СЕ 286188, 16.02.2000. СВ 750561, 31.10.1956. (98) Адрес для переписки: 119334, Москва, Ленинский пр. 44, кв.120, В.Н. Хлопонину (71) Заявитель: Хлопонин Виктор Николаевич (КИ), ШУМАХЕР Эвальд А. (ОЕ) (72) Изобретатель: ШУМАХЕР Эдгар Э. (0Е), Хлопонин В.Н. (КУ), ШУМАХЕР Эвальд А. (ОЕ), Зинковский И.В. (КУ) С 2 (73) Патентообладатель: Хлопонин Виктор Николаевич (КИ), ШУМАХЕР Эвальд А. (ОЕ) (54) СПОСОБ ПЕРЕМЕШИВАНИЯ СТАЛИ В ...

Desulfurization Method of Cryogenic Cryogenic Carbon

본 발명은 텔레비젼 브라운관에 사용되는 새도우마스크, 또는 첨단 자동차 외판소재인 심가공용 소재 등에 적합한 극저류 극저탄소강의 제조에 관한 것이며; 그 목적은 유황함량이 80ppm이하, 탄소함량이 100ppm이하인 극저탄소강을 제공함에 있다. 상기 목적달성을 위한 본 발명은 유황함량이 120ppm이하로 예비 탈황처리된 용선을 전로에서 탄소를 500ppm 이하로 탈탄하여 1차 정련한 다음, 1차 정련된 용강을 레이들내로 출강하여 노외정련하고, 이어서 버블링공정 및 진공 탈가스처리하여 탄소함량을 100ppm이하, 질소함량을 40ppm이하인 극저탄소 용강을 제조하는 방법에 있어서, 상기 용강을 레이들에 출강시 용강톤당 생석회를 4.6~7.8Kg의 범위에서 투입하고, 출강종료후 노외정련시 슬래그층에 Al 2 O 3 계 플럭스를 용강톤당 1.25~2.25Kg의 범위에서 투입한 다음, 버블링공정에서 용강을 2분이상 교반함을 포함하여 구성되는 극저류 극저탄소 용강의 탈황방법에 관한 것을 그 기술적 요지로 한다.

Refining method of low carbon steel

내용 없음.

A method for manufacturing non-oriented electrical steel sheet having low iron loss

본 발명은 발전기 및 모터 등의 소재로 사용되는 무방향성 전기강판의 제조에 관한 것이며; 그 목적은 철손이 저감되는 무방향성 전기강판을 제공함에 있다. The present invention relates to the production of non-oriented electrical steel sheet used in materials such as generators and motors; The purpose is to provide a non-oriented electrical steel sheet is reduced iron loss. 상기 목적달성을 위한 본 발명은 용선을 정련하여 Si 1.0~ 5.0중량%, Al 0.2~1.5중량%, (C+S+N) 0.01중량%이하를 포함하여 조성되는 용강을 이용하여 무방향성 전기강판을 제조하는 방법에 있어서, 상기 정련된 용강을 진공탈가스처리하고, 탈가스 처리된 용강 상부의 슬래그 조성을 CaO 60~65%, Al 2 O 3 30~35% 및 SiO 2 5~10%로 조절한 후, 용강에 교반가스를 상취와 저취를 통해 적어도 10분 이상 동시에 취입한 다음, 이 용강을 연속주조하여 구성되는 무방향성 전기강판의 제조방법에 관한 것을 그 기술적 요지로 한다. The present invention for achieving the above object is a non-oriented electrical steel sheet using molten steel to be refined molten iron, including 1.0 to 5.0% by weight, 0.2 to 1.5% by weight of Al, 0.01% by weight (C + S + N) In the method of manufacturing, the refined molten steel is vacuum degassed, the slag composition of the degassed molten steel on the upper side is adjusted to CaO 60 ~ 65%, Al 2 O 3 30 ~ 35% and SiO 2 5 ~ 10% After that, the stirring gas is blown into the molten steel at least 10 minutes at the same time through the upper and lower odor, and then the technical gist of the non-oriented electrical steel sheet which is constructed by continuously casting the molten steel.

Device for mixing slag in refining furnace

본 발명의 목적은 정련로위 환원 및 탈류단계에서 슬래그 교반을 향상시켜 슬래그덩어리를 충분히 풀어줌으로써, 용강의 성분을 균일하게 유지할 수 있도록 된 정련로의 슬래그 교반장치를 제공함에 있다. An object of the present invention is to provide a slag agitation apparatus of a refining furnace that is able to maintain the components of the molten steel uniformly by improving the slag agitation in the reduction and dehydration step on the refining furnace to sufficiently release the slag mass. 이에 본 발명은 내부에 내화연와가 축조되고, 상부에 수직으로 톱랜스가 설치되며, 하단 측면으로는 외주면을 따라 풍구가 형성되어 산소 또는 불활성가스를 취입하기 위한 파이프가 장입설치된 구조의 정련로에 있어서, 상기 정련로의 슬래그층에 해당되는 측면 일정 위치에 측면풍구가 형성되고, 상기 측면풍구를 통해 불활성가스를 취입하는 측면파이프가 장입 설치되어 슬래그층에 불활성가스를 취입하도록 된 것을 특징으로 하는 정련로의 슬래그 교반장치를 제공한다. Accordingly, the present invention is a fire retardant structure is built therein, the top lance is installed vertically in the upper side, the lower side is formed in the blast furnace along the outer circumferential surface of the refining furnace of the structure is installed with a pipe for blowing oxygen or inert gas The side vents are formed at a predetermined side surface corresponding to the slag layer of the refining furnace, and a side pipe for injecting the inert gas through the side vents is charged to inject the inert gas into the slag layer. Provided is a slag stirrer of the refining furnace. 정련로, 측면풍구, 측면파이프, 불활성가스 Refining furnace, side vents, side pipes, inert gas

The method for removing sulfur and preventing nitrogen pick-up at the deoxidized steel

본 발명은 강교반 중 발생되는 나탕을 통하여 CaCO 3 와 Al을 첨가하여 탈황반응을 유도하고 나탕부위를 통하여 질소가 혼입되는 것을 방지하도록 된 탈산용강의 탈황 및 질소 혼입 방지 방법을 제공하는 데 목적이 있다. An object of the present invention is to provide a method for preventing desulfurization and nitrogen incorporation of deoxidation molten steel, which induces desulfurization reaction by adding CaCO 3 and Al through a tang generated during steel stirring and prevents nitrogen from being mixed through the tang part. have. 따라서 본 발명은 탈산용강의 이차정련시 레이들 상부로부터 랜스를 탈산용강에 침지하거나 레이들 바닥의 저취 노즐을 통해 불활성 가스를 취입하여 나탕이 형성되도록 하고, 나탕에 탈산용강 1톤당 CaCO 3 2.5㎏ 및 Al 0.4~0.5kg을 동시에 투입하는 투입단계; 투입단계에서 CaCO 3 및 Al의 투입된 후 나탕이 유지되도록 탈산용강을 강교반하는 나탕유지단계; 나탕유지단계 후 나탕이 발생되지 않도록 불활성가스의 유량을 줄여 3∼5분 동안 약교반을 실시하는 약교반단계;를 포함하는 탈산용강의 탈황 및 질소혼입 방지방법을 제공한다. Therefore, in the present invention, during secondary refining of the deoxidation steel, the lance is immersed in the deoxidation steel from the upper ladle or inert gas is blown through the lower nozzle of the bottom of the ladle to form a tang, and 2.5 kg of CaCO 3 per ton of the deoxidizing steel in the tang. And input step of simultaneously injecting 0.4 ~ 0.5kg Al; Natang maintenance step of stirring the deoxidation steel to maintain the molten after the addition of CaCO 3 and Al in the input step; Provides a method for preventing desulfurization and nitrogen incorporation of the deoxidation steel, including; a weak stirring step of reducing the flow of inert gas after the maintenance of the hot water to reduce the flow of inert gas for 3 to 5 minutes. 슬래그, 교반, 나탕, 탈황, 질소 Slag, Stirring, Natang, Desulfurization, Nitrogen

METHOD FOR REFINING AUSTENITIC STAINLESS STEEL HAVING Ti

본 발명은 VOD(Vaccum Oxygen Decarburization)을 이용하여 Ti이 함유된 오스테나이트계 스테인리스강을 생산할 수 있도록 하는 티타늄 함유 오스테나이트계 스테인리스강의 용강 정련방법에 관한 것으로서, 본 발명의 일 실시형태에 따른 티타늄 함유 오스테나이트계 스테인리스강의 용강 정련방법은 Ti이 함유되는 오스테나이트계 스테인리스강의 용강을 정련하는 방법으로서, 용강이 장입된 정련로에 산소와 불활성 가스를 취입하면서 탈탄을 실시하여 1차로 탄소 농도를 조정하는 준비단계와; 1차로 탄소 농도가 조정된 용강이 장입된 래들을 진공정련설비에 장착한 후 진공 중에서 상기 래들에 산소와 불활성 가스를 취입하면서 탈탄을 실시하여 탄소의 목표농도까지 2차로 탄소 농도를 조정하는 진공 탈탄단계와; 진공 중에서 용강을 교반하면서 상기 래들에 부원료와 탈산제를 투입하여 탈류와 탈산을 실시하는 진공 환원탈류단계를 포함하고, 상기 진공 환원탈류단계에서 투입되는 부원료는 Ti가 함유된 합금철을 포함하여 용강의 Ti의 목표농도를 달성하는 것을 특징으로 한다. The present invention relates to a molten steel refining method of a titanium-containing austenitic stainless steel to produce Ti-containing austenitic stainless steel using VOD (Vaccum Oxygen Decarburization), titanium-containing according to an embodiment of the present invention The molten steel refining method of austenitic stainless steel is a method of refining molten steel of austenitic stainless steel containing Ti. The carbon concentration is primarily adjusted by decarburizing while injecting oxygen and an inert gas into a molten steel refining furnace. A preparation step; Vacuum decarburization is carried out by mounting a ladle loaded with molten steel having a first carbon concentration adjusted to a vacuum refining facility, and decarburizing while injecting oxygen and an inert gas into the ladle in a vacuum to secondly adjust the carbon concentration to a target carbon concentration. Steps; Including a vacuum reduction desulfurization step of degassing and deoxidation by injecting a secondary raw material and a deoxidizer into the ladle while stirring the molten steel in a vacuum, the secondary raw material input in the vacuum reducing desulfurization step includes the alloy iron containing Ti It is characterized by achieving the target concentration of Ti.

Method for dissolving and reducing iron oxide-containing iron raw materials in electric furnaces

この電気炉は、１本以上の上部電極と、１本以上の底吹き羽口と、インペラーを具備する機械式攪拌機と、酸化鉄含有鉄原料を投入する投入装置と、を備える。 This electric furnace includes one or more upper electrodes, one or more bottom blowing tuyere, a mechanical stirrer including an impeller, and a charging device for charging an iron oxide-containing iron raw material.

Method for Refining Molten Steel of Titanium Added Partially Killed Steel

본 발명은 건축구조용 소재등에 사용되는 티타늄 첨가 미탈산 강의 용강을 정련하는 방법에 관한 것이다. The present invention relates to a method for refining molten steel of titanium-added nittalized steel used for building structural materials and the like. 본 발명에 의하면, 티타늄 첨가 미탈산 강의 용강을 정련하는 방법에 있어서, 전로정련된 용강을 래들로 출강한 후 용강이 수강된 래들을 진공 탈개스 장치로 이송하여 진공 탈개스 처리를 실시한 다음, 엘에프(LF)에서 승온 및 티타늄(Ti)성분을 조정하고; 그리고 상기 출강 초기에 용강 탈산제로 알루미늄(Al)을 용강 1 톤당 0.5~1 kg 투입하고 출강완료 후 알루미늄 합금철을 용강 톤당 1~3kg 투입하고, According to the present invention, in the method for refining molten steel of titanium-added taltal acid steel, after the molten steel is converted into ladle, the molten steel is transferred to a vacuum degassing apparatus and subjected to vacuum degassing treatment. Temperature increase and titanium (Ti) component in F (LF); And at the beginning of the tapping, aluminum (Al) is added 0.5-1 kg per tonne of molten steel as the molten steel deoxidizer, and 1-3 kg per tonne of aluminum alloy iron is added after the tapping is completed. 상기 진공 탈개스 처리는 진공도 2 torr 이하에서 15분~25분동안 행하여 지고, The vacuum degassing treatment is performed for 15 minutes to 25 minutes at a vacuum degree of 2 torr or less, 상기 LF에서의 티타늄(Ti)성분 조정은 승온완료 후 아르곤(Ar) 가스를 0.005~0.010 Nm 3 /분 의 유량으로 취입하여 용강을 교반하면서 티타늄계 합금철을 투입하여 이루어지는 것을 특징으로 하는 티타늄 첨가 미탈산 강의 용강의 정련방법이 제공된다. Titanium (Ti) component adjustment in the LF is added by adding a titanium-based alloy iron while stirring the molten steel by blowing the argon (Ar) gas at a flow rate of 0.005 ~ 0.010 Nm 3 / min after completion of the temperature increase A method for refining molten steel of mithalated steel is provided. 본 발명은 티타늄 첨가 미탈산 용강을 정련함에 있어서, 강중 티타늄 성분을 정밀하게 제어하고 티타늄 개재물을 미세하게 분포시킬 수 있는 효과가 있는 것이다. In the present invention, in refining titanium-added moltal acid molten steel, it is possible to precisely control the titanium component in the steel and to finely distribute the titanium inclusions. 티타늄, 미탈산, 성분제어, 출강, 탈기스차리, Titanium, mithal acid, ingredient control, tapping, degassing,

Method of manufacturing manganese-containing steel

본 발명은 유가 원소의 손실을 최소화하면서 불순물 원소를 제거하는 망간 함유 강의 제조 방법에 관한 것으로서, 산소 취입형 정련 용기에서 용강을 1차 취련하는 단계; 상기 용강을 출강하는 단계; 상기 용강에 탈산제 또는 가탄제를 투입하는 단계; 상기 정련 용기에 고상의 합금철을 투입하는 단계; 상기 용강을 상기 정련 용기에 재장입하는 단계; 상기 정련 용기에서 상기 용강을 2차 취련하는 단계; 및 상기 용강의 슬래그를 탈산하는 단계를 포함하여, 망간 손실을 적게 하면서 산소 취입을 할 수 있고 용강의 불순물 원소를 제어할 수 있으며, 별도의 승온 공정을 생략하여 생산수율을 향상시키고 제조 단가를 줄일 수 있다. The present invention relates to a method of manufacturing manganese-containing steel for removing impurity elements while minimizing the loss of valuable elements, comprising: primary molten steel in an oxygen blown refining vessel; Tapping the molten steel; Injecting a deoxidizer or a charcoal to the molten steel; Injecting solid iron alloy into the refining vessel; Recharging the molten steel into the refining vessel; Secondary blowing the molten steel in the refining vessel; And deoxidizing the slag of the molten steel, so that oxygen can be blown while reducing manganese loss, the impurity elements of the molten steel can be controlled, and a separate heating step is omitted to improve production yield and reduce manufacturing cost. Can be. 합금철, 망간, 고망간강, 망간 효율, 취련 Ferroalloy, Manganese, High Manganese Steel, Manganese Efficiency, Blowing

Advanced material for molten metal processing equipment

Simplified ladle refining process

A process of refining molten steel for high clean steel

본 발명은 고청정강의 정련방법에 관한 것으로, 그 목적은 전로에서 미탈산된 용강에 생석회계 분체를 투입하여 알루미늄개재물을 부상이 용이한 칼슘알루미네이트로 형상제어함으로써, 고청정강을 얻을 수 있는 정련방법을 제공함에 있다. 이와 같은 목적을 갖는 본 발명은, 전로에서 출강된 미탈산 용강에 생석회계 분체(Flux Powder)를 취입하고 알루미늄으로 탈산한 다음, 이때 발생되는 비중이 낮은 칼슘알루미네이트형 개재물을 자력부상시키거나 또는 RH에서 감압정련을 실시할 때 아르곤 기포에 의해 포착하여 부상 제거시킴으로써, 강의 청정도를 개선할 수 있는 고청정강의 정련방법에 관한 것을 그 기술적요지로 한다. 이러한 본 발명은, 주편에서의 전산소량이 종래의 20ppm이상 수준에서 8-13ppm을 얻게됨으로써 대폭적인 개재물 저감효과를 실현할 수 있으며, 또한, 본 발명에 따라 정련한 용강중에는 기존의 알루미나개재물 대신 칼슘알루니마네이트 개재물이 존재하므로 연속주조중 노즐막힘을 대폭감소할 수 있는 효과가 있다.

Process for casting and forming slag products

The present invention relates to a process and apparatus to cast and form slag directly from the molten state into crystalline or amorphous products suitable for use as decorative and structural building and construction materials. Molten slag and additives are refined at high temperature in a treatment furnace for a period of hours. The eventual entrapped gas content is controlled using a variety of methods, such as vacuum pressures and bottom stirring with inert gas. The molten slag is cast directly into moulds, and these moulds form the slag into any shape desired. The farmed products are immediately introduced into a heat treatment furnace at temperatures at or above the glass transition temperature (GTT) for the case of crystalline products, or just below the GTT for amorphous products. The product is thermally cycled over a period of hours to relieve thermal stresses during coaling to ambient temperatures. If desired, the product can be coated using enamel or glaze and cured in another furnace, or metal plated.

Method of manufacturing for low-carbon austenite stainless steel

본 발명은 0~30% 크롬과 5~15% 니켈을 함유하며, 타이타늄 함량이 50ppm이하이고 탄소함량이 300ppm이하인 원료를 전기로에서 용해하고 알곤-산소 탈탄법(AOD)으로 정련한 뒤 주조래들 처리를 거쳐 연속주조하는 저탄소 오스테나이트계 스테인레스강의 제조방법에 있어서, 상기 AOD정련로에서 상기 래들처리를 거치는 알루미나 농도를 저감시키는 단계; 및 상기 래들처리에서 상기 연속주조를 거치는 용강 개재물을 저하시키는 단계;를 포함하는 것을 특징으로 하여, 용강 중의 고융점 개재물 발생을 억제하고, 개재물수를 대폭 저감하여 최종 제품의 표면품질을 향상시킬 수 있는 저탄소 오스테나이트계 스테인레스강의 제조방법이다. The present invention contains 0-30% chromium and 5-15% nickel, and the raw material with titanium content of 50 ppm or less and carbon content of 300 ppm or less is melted in an electric furnace and refined by argon-oxygen decarburization (AOD) and then casting ladle A method of manufacturing a low carbon austenitic stainless steel that is continuously cast through a treatment, the method comprising: reducing the alumina concentration subjected to the ladle treatment in the AOD refining furnace; And reducing the molten steel inclusions subjected to the continuous casting in the ladle treatment, to suppress the occurrence of high melting point inclusions in the molten steel and to significantly reduce the number of inclusions to improve the surface quality of the final product. Low carbon austenitic stainless steel. 오스테나이트, 스테인레스강, 저탄소, 청정도, 표면품질 Austenitic, Stainless Steel, Low Carbon, Cleanliness, Surface Quality

Back flow method of molten metal with vaccum degasification device

The present invention relate to molten steel acceleration reflux apparatus of vacuum degassing equipment using electromagnetic force by alternative current to produce a good quality of iron and steel product improving gas removing rate in molten steel by reducing decarbonization time by ascending molten steel reflux rate in vacuum degassing equipment.Molten acceleration reflux apparatus comprises ladle stored molten steel; a ascending pipe fractional settled in molten steel in said ladle, instal generator of electromagnetic force composed coil and core in said ascending pipe in circumference, generate lorentz force to increase synergy of molten steel by applying alternating current in said coil, a down pipe; and a vessel installed with decarbonization gas inlet to generate gas bubble in said ascending pipe in a side.

Basic oxygen steelmaking method with iron oxide pellet adduct

철산화물 유니트가 송풍하는 동안 용융물에 부가되는 BOF 공정은 산소유동이 펠리트를 공급하는 동안에 감소되고 불활성 가스로 보충되어 총 가스유동이 최적 BOF 실시를 달성하도록 설계된 것과 같은 것으로 유지되는 것을 특징으로 한다.

Refining vessels for hot melts

Rotary degassers and components therefor

Disclosed are degassers, couplings, impeller shafts and impellers for use in molten metal. One such coupling transfers gas into an impeller shaft, the coupling having a smooth, tapered internal surface to align with a corresponding surface on the impeller shaft and help prevent gas leakage and to assist in preventing damage to the impeller shaft. Improved impellers for shearing and mixing gas are also disclosed, as is a degasser including one or more of these components.

DEVICE FOR SCRAPPING OF STANDARD MINERAL MELTA, SK BEARING, FROM PIPEN TO A TRANSPORT RANGE FOR A MINERAL MELTA AT A PLANT FOR THE PRODUCTION OF MINERAL WOOL FIBER

Impellar for dispersing gas into molten metal

An impeller for dispersing gas into molten metal includes a rectangular p rism body having upper and lower faces and four side walls. The body has an opening extending through the upper and lower faces and defines a hub around the opening on the upper face. The impeller further includes a plurality of elongate grooves extending radially outwardly from the hub.

Electric furnace and method for melting and reducing iron oxide-containing iron raw material

This electric furnace is provided with: one or more upper electrodes; one or more bottom-blowing tuyeres; a mechanical agitator including an impeller; and a feeding device for feeding an iron oxide-containing iron raw material.

Method for treating copper smoke dust by using oxygen-enriched side-blown reduction smelting furnace

本发明公开了一种用富氧侧吹还原熔炼炉处理铜烟尘的方法，包括步骤，S1：采集铜烟尘，并酸浸采集的所述铜烟尘，再将酸浸好的铜烟尘进行干燥备用；S2：将干燥好的酸浸铜烟尘与焦粉、石灰、铁粉、其他含金属废弃料及污水处理板框渣配料，粉碎后塑形成砖料备用；S3：将砖料以及石英石、石灰石、除铜渣和焦炭一起放入旋流热氧循环富氧侧吹还原熔炼炉内，并向所述旋流热氧循环富氧侧吹还原熔炼炉内喷入富氧空气；S4：控制所述旋流热氧循环富氧侧吹还原熔炼炉的温度达到预设温度，并维持3‑4h，熔炼结束后，从出铅口放出一次粗铅、从出铜口放出一次铅冰铜，一次铅冰铜铸块，出渣口放炉渣。利用还原熔炼炉可高回收率地回收铜烟尘中的有价金属，且工艺简单、成本低。

PNEUMATIC BREWING PROCESS FOR POUCHED LIQUID METAL

Advanced material for molten metal processing equipment

A molten metal processing apparatus selected from a pump, a degasser, a flux injector, and a scrap submergence device constructed to include at least one element comprised of C/C composite.

Casting apparatus, useful for producing silicon ingot, comprises crucible for storing melt, heater, and inert gas supply device including gas flow passage and gas discharging hole located at a distal end portion of inert gas supply device

The casting apparatus comprises a crucible (20) that stores a melt and has an opening on its upper side, a heater for heating the crucible, and a device for supplying an inert gas to an upper portion of an interior of the crucible, where the inert gas supplying device extends to the upper portion of the interior of the crucible and includes a gas flow passage and a gas discharging hole located at a distal end portion of the inert gas supply device. The gas flow passage includes a main gas supply tube placed in a distal end of upper portion of the crucible. The casting apparatus comprises a crucible (20) that stores a melt and has an opening on its upper side, a heater for heating the crucible, and a device for supplying an inert gas to an upper portion of an interior of the crucible, where the inert gas supplying device extends to the upper portion of the interior of the crucible and includes a gas flow passage and a gas discharging hole located at a distal end portion of the inert gas supply device. The gas discharge hole is provided such that a flow of the supplied inert gas from the gas discharging hole is parallel to a surface of the melt in the crucible or is inclined at a predetermined angle to the surface of the melt in the crucible. The gas flow passage includes a main gas supply tube placed in a distal end of upper portion of the crucible, and the gas discharge hole is formed in a side surface of a distal end portion of the gas supply tube. The gas flow passage further includes gas supply pipes branched from a distal end of the main gas supply pipe. The branched gas supply pipes are arranged parallel to the surface of the melt in the crucible. The gas discharge hole is provided in a distal end of the branched gas supply pipes. An independent claim is included for a casting process.

Bottom stirring tuyere and method for operating a basic oxygen furnace

Simple ladle refining method

A simple ladle refining method capable of increasing temperature in a short time with scattering and deposition of splash and refractory melting loss restricted. A method of refining molten steel in a ladle, comprising blowing an inactive gas into the ladle through the bottom of the ladle, inserting an immersion pipe into the ladle while agitating the molten steel and blowing an oxidizing gas onto the surface of the molten steel in the immersion pipe via a lance, wherein a ratio (do/dt) of a nozzle exit diameter (do)(mm) to a nozzle throat diameter (dt)(mm) is set to 1.2.alpha. to 2.5.alpha., where .alpha. i s defined as a function of a back pressure.

Bottom stirring tuyere and method for a basic oxygen furnace

A method of operating a BOF bottom stir tuyere having an inner nozzle surrounded by an annular nozzle, including during a hot metal pour phase and a blow phase, flowing an inert gas through both nozzles; during a tap phase, initiating a flow of a first reactant through the inner nozzle and a flow of a second reactant through the annular nozzle, and ceasing the flow of inert gas through the nozzles, wherein the first and second reactants includes fuel and oxidant, respectively, or vice-versa, such that a flame forms as the fuel and oxidant exit the tuyere; during a slag splash phase, continuing the flows of fuel and oxidant to maintain the flame; and after ending the slag splash phase and commencement of another hot metal pour phase, initiating a flow of inert gas through both nozzles and ceasing the flows of the first and second reactants.

Refining method of molten steel and an apparatus thereof

본 발명은 쇳물을 정련하는 정련 장치 및 정련 방법에 관한 것으로서, 쇳물이 장입되는 공간을 형성하는 용기, 용기 상부에 상하 방향으로 연장 형성되는 임펠러 몸체와, 임펠러 몸체의 상부 외주면에 구비되는 블레이드를 구비하는 임펠러 및 용기의 바닥면을 관통하여 구비되며, 쇳물 내부에 기체를 취입하는 적어도 하나 이상의 저취 플러그을 포함하고, 블레이드의 상부면은 쇳물의 탕면에 인접하도록 침지되어 배치되고, 저취 플러그는 용기 바닥면에서 블레이드의 외측에 위치하도록 구비되어, 쇳물의 탕면에 인접하도록 임펠러를 침지시키고 용기의 하부에서 임펠러의 블레이드 외측에서 가스를 주입함으로써 가스에 의한 흐름이 임펠러의 회전 흐름과 혼합되어 쇳물을 교반할 수 있다. 이에, 종래에 임펠러의 회전 흐름과 임펄레로부터 취입되는 가스의 흐름간에 충돌에 의해 교반력이 상쇄되는 것을 방지할 수 있고, 쇳물의 교반율을 증가시킴으로써 쇳물에 투입되는 탈린제의 반응율을 증가시킬 수 있다. 따라서, 쇳물 중의 인 농도를 효율적으로 제어할 수 있다. The present invention relates to a refining apparatus and a refining method for refining refuse and includes a container for forming a space into which refuse is charged, an impeller body extending vertically in an upper portion of the container, and a blade provided on an upper outer circumferential surface of the impeller body And an upper surface of the blade is immersed and disposed so as to be adjacent to the bath surface of the tumbler, and the low-temperature tumbler plug is disposed on the bottom surface of the container, The impeller is immersed so as to adjoin the bath surface of the molten metal and the gas is injected from the lower part of the vessel outside the impeller blade so that the gas flow can be mixed with the rotating flow of the impeller to stir the molten metal have. Therefore, it is possible to prevent the agitation force from being canceled by the collision between the rotating flow of the impeller and the flow of the gas blown from the impeller, and to increase the stirring rate of the molten material, thereby increasing the reaction rate of the talline agent . Therefore, the phosphorus concentration in the molten metal can be efficiently controlled.

Steel manufacturing method using converter

本发明提供一种在转炉内对金属液有效地进行脱磷、脱磷与脱碳、或脱硫、脱磷与脱碳的方法。调整要加入的助熔剂数量和底吹气体数量以使底吹搅拌能和处理后的CaO/SiO 2 比分别至少为0.1KW/ton和0.7-2.5，处理终点的金属液温度为1,200℃-1,450℃。此外，通过调整顶吹氧气进气速率、底吹气体流量或顶吹喷管高度，来控制本方法的操作使处理后炉渣中的T.Fe浓度与MnO浓度之和为10-35%(按重量)。

Processing apparatus for molten metal

본 발명은 용융물 처리장치 및 그 처리방법에 관한 것으로서, 내부에 용융물이 수용되는 공간이 형성되는 용기; 상기 공간으로 가스를 공급하기 위해 상기 용기의 하부에 구비되는 노즐; 상하방향으로 이동 가능하도록 상기 용기의 상부에 구비되고, 상기 용기 내에 수용되는 용융물을 교반하는 교반기; 및 가스의 공급 패턴과 상기 교반기의 동작을 제어하는 제어부;를 포함하고, 용융물에 불규칙한 흐름을 형성하여 교반 효율을 향상시킬 수 있다. The present invention relates to a melt processing apparatus and a method for processing the same, a container in which a space in which the melt is accommodated is formed; A nozzle provided below the container to supply gas to the space; A stirrer provided on the upper portion of the container so as to be movable in the vertical direction and stirring the melt contained in the container; And a control unit for controlling the supply pattern of the gas and the operation of the stirrer, and may improve the stirring efficiency by forming an irregular flow in the melt.

Oxy-fuel combustion system and method for melting a pelleted charge material

A system for melting a pelleted charge material including a furnace having a feed end configured to receive a solid pelleted charge material and a discharge end opposite the feed end configured to discharge a molten charge material and a slag, a conveyor configured to feed the pelleted charge material into the feed end of the furnace, at least one oxy-fuel burner positioned to direct heat into a melting zone near the feed end to heat and at least partially melt the pelleted charge material to form the molten charge material and slag, wherein the oxy-fuel burner uses an oxidant having at least 70% molecular oxygen, and at least one flue for exhausting burner combustion products from the furnace.

METAL BATHROOM MIXING METHOD AND FURNACE INSTALLATION

Method of manufacturing low carbon molten steel by vacuum degasification and decarbonization

진공탈가스 처리에 있어 환류용가스, 교반용 가스로서 CO 2 가스를 사용하므로써 탈탄정지 또는 탄소농도의 증가를 초래함이 없이도 또한 합금첨가량을 증가시킴이 없이도 가스코스트를 절감할 수 있도록 용강의 진공탈가스 처리상 탈가스처리 개시시부터 용강의 탄소농도가 50ppm 에 도달할 때까지의 사이에는 CO 2 가스를 취입하고 그 이후에는 Ar 가스를 사용하는 용강의 진공탈가스 및 탈탄처리방법. By using CO 2 gas as reflux gas and stirring gas in vacuum degassing treatment, vacuum of molten steel can be saved without reducing decarburization or increasing carbon concentration and without increasing alloying amount. A vacuum degassing and decarburization method for molten steel in which CO 2 gas is blown from the start of degassing treatment until the carbon concentration of molten steel reaches 50 ppm, and thereafter, Ar gas is used.

Advanced materials for molten metal processing equipment

本申请涉及用于熔融金属加工设备的先进材料。一种熔融金属加工装置，选自构建成包括包含C/C复合物的至少一种元件的泵、脱气器、助熔剂注射器和碎屑下沉器。

RH vacuum degassing apparatus for molten steel refining of high clean ultra low carbon steel and refining method using the same

본 발명은 제강공정에서 고청정극저탄소강의 용강을 정련하는 RH 진공탈가스 장치 및 이를 이용한 정련방법에 관한 것으로써, 종래의 RH 진공 탈가스 장치의 하강 환류관에 가스취입노즐을 구비하여 이를 통해 불활성 가스를 취입하므로써, 용제(flux)를 사용하지 않고서도 정련 효율을 높일 수 있을 뿐만 아니라 환류시간을 단축시킬 수 있는 고청정 극저 탄소강의 용량정련용 RH 진공탈가스장치 및 이를 이용한 정련방법을 제공하고자 하는데, 그 목적이 있다. 본 발명은 상승환류관(11), 진공조(12) 및 하강환류관(13)을 포함하여 구성되는 RH 진공탈가스 장치에 있어서, 상기 하강환류관(13)에 원주방향으로 8-16개의 가스취입노즐(23a)이 형성되고, 그리고 상기 노즐(23a)의 직경이 1-3mm인 고청정 극저탄소강의 용강정련용 RH 진공탈가스 장치 및 이를 이용한 정련방법을 그 요지로 한다.

The denitriding method of molten metal

본 발명은 용강정련시 용강중의 질소를 제거하는 방법에 관한 것으로써, 진공탱크를 이용하여 질소를 제거하는 방법에 있어서 래들내 용강의 교반력과 용강성분을 조정하므로써 보다 경제적이고 보다 높은 효율로 용강중의 질소를 제거하는 방법을 제공하고자 하는데, 그 목적이 있다. 본 발명은 용강이 수강된 래들을 진공탱크내에 위치시켜 용강중의 질소를 제거하는 방법에 있어서, 상기 진공탱크내에 래들을 위치시킨후 래들 슬래그의 SiO 2 함량 및 CaO/SiO 2 값이 각각 20% 이하 및 1-2.5 가 되고, 래들에 수강된 용강중의 Sol.Al 의 함량이 0.06-0.08%가 되도록 생석회 및 Al 공급원을 래들내에 투입하는 단계; 상기 진공탱크내의 진공도를 높여가면서, 교반가스를 그 나탕부위의 직경(d)이 래들 직경(D)의 25% 이상이 되도록 하는 유량으로 래들 하부로부터 용강내에 취입하여 5-10분 동안 강버블링하므로써 용강중의 황(S)농도를 0.01%이하로 탈황처리하는 단계; 및 상기 탈황처리후 교반가스를 그 나탕부위의 직경(d)이 상기 래들 직경(D)의 20% 이상이 되도록 하는 유량으로 래들 하부로부터 용강내에 취입하므로써 용강중의 질소를 제거하는 단계;를 포함하여 구성되는 진공탱크를 이용한 용강중의 질소 제거 방법을 그 요지로 한다.

DEVICE FOR SCRAPPING OF STANDARD MINERAL MELTA, SK BEARING, FROM PIPEN TO A TRANSPORT RANGE FOR A MINERAL MELTA AT A PLANT FOR THE PRODUCTION OF MINERAL WOOL FIBER

Method of manufacturing low carbon molten steel by vacuum degasification and decarbonization

Side blowing lance for smelting furnace and use method

The refining method of molten metal with low carbon steel making

PURPOSE: A process for refining molten steel capable of easily removing a carbon component of molten steel, effectively preventing the temperature lowering of molten steel and performing stable operations is provided, which has an effect on absolutely solving a possibility of danger caused by a leakage of lance cooling water during blowing oxygen. CONSTITUTION: The titled molten steel refining method comprises the steps of: installing a plurality of a lance nozzles(10) for gas injection comprising an inner pipe and exterior pipe formed by a neck part on the side wall of a vacuum tank(110) of an RH vacuum degassing apparatus to inject gas toward molten steel in the vacuum tank; subjecting molten steel contained in a timing ladle(140) to a rise into the vacuum tank along a rising reflux pipe(121); and injecting oxygen or oxygen-containing gas toward molten steel to form supersonic jet stream and cooling gas for cooling the inner pipe through the exterior pipe.

EMPTY METAL EMPTY TREATMENT WITH SIMULTANEOUS AGITATION BY HELIO INJECTION.

Procedimiento de tratamiento a vacío de un metal fundido en forma líquida que comprende las etapas que consisten en: - introducir el metal fundido en forma líquida en una cuchara metalúrgica llenando dicha cuchara hasta alcanzar una altura de seguridad comprendida entre 0, 4 y 0, 6 m. - tratar el metal a la vez que pone la atmósfera por encima de dicha bolsa a vacío y procediendo simultáneamente a una agitación del metal fundido por inyección de helio en el fondo de dicha cuchara durante una parte o la totalidad del tratamiento. Vacuum treatment process of a molten metal in liquid form comprising the steps consisting of: - introducing the molten metal in liquid form into a metallurgical spoon filling said spoon until reaching a safety height between 0, 4 and 0, 6 m. - treating the metal while placing the atmosphere above said vacuum bag and simultaneously stirring the molten metal by injection of helium at the bottom of said spoon for part or all of the treatment.

Production method for low carbon molten steel using vacuum degassing and decarburization treatment

In a vacuum degassing and decarburization treatment, the present invention uses a CO2 gas as a recirculating gas and as a stirring gas without inviting stoppage of decarburization and an increase in the carbon concentration and moreover, without an increase in the amount of addition of an alloy, and can reduce the gas cost. The present invention provides a production method for a low carbon molten steel which comprises blowing a CO2 gas from the start of degassing treatment till the carbon concentration of the molten steel reaches 50 ppm in vacuum degassing and decarburization treatment of the molten steel, and thereafter blowing an Ar gas.

Manufacturing method of clean steel

본 발명은 청정강 제조방법에 관한 것으로, 전로 또는 전기로의 용강을 래들로 출강 중 상기 래들 내의 용강에 알루미늄과 생석회를 투입하여 슬래그를 형성시키는 단계와; 상기 슬래그가 형성된 용강을 2차정련설비(LF,Laddle Furnace)로 이송하여 승온하는 단계와; 승온 후 상기 용강에 슬래그 조재제를 투입하는 단계를 포함한다. 본 발명은 LF에서 용강의 승온 후 슬래그 조재제를 투입하여 슬래그 조성을 유지하고 재산화 발생을 방지하므로 용강의 청정도가 향상되는 이점이 있다. The present invention relates to a method for manufacturing clean steel, comprising: injecting aluminum and quicklime into molten steel in the ladle while tapping molten steel in a converter or electric furnace to form slag; Transferring the molten steel on which the slag is formed to a secondary refining facility (LF, Ladle Furnace) to heat up the slag; Including the step of adding a slag aid to the molten steel after the temperature rise. The present invention has the advantage of improving the cleanliness of the molten steel because the slag preparation is added to the slab after the temperature rise of the molten steel in LF to maintain the slag composition and prevent reoxidation.

Vacuum treatment of cast metal with simultaneous helium-injection stirring

The invention concerns a vacuum treatment of cast metal in liquid form comprising steps which consist in: introducing the cast metal in liquid form into the metallurgic ladle filling said ladle until a guard height ranging between 0.4 and 0.6 m is reached; treating the metal while bringing the atmosphere above said ladle under vacuum and simultaneously stirring the cast metal by injecting helium into the base of said ladle during part of or the whole treatment.

Refining process of invar steel

본 발명은 36%니켈-철 함유 용강의 연속주조후 주편내 발생되는 핀홀 발생을 억제하기 위한 인바용강의 진공정련 방법에 관한 것으로, 상기 인바강의 기본성분조성을 가진 용강을 통상의 방법으로 진공 정련로에서 탈탄한 다음, 알루미늄(Al)탈산 5분 경과후 10~0.1mb진공 조건하에서 타이타늄(Ti)을 0.05%~0.5% 범위로 첨가하여 아르곤 교반을 실시하고, 대기압에서 조정 버블링을 실시하는 것을 그 주요 요지로 한다. The present invention relates to a vacuum refining method of Invar steel for suppressing pinholes generated in cast steel after continuous casting of 36% nickel-iron containing molten steel, and to vacuum molten steel having a basic composition of the Invar steel by a conventional method. After decarburizing at, and after 5 minutes of aluminum (Al) deoxidation, argon was stirred by adding titanium (Ti) in the range of 0.05% to 0.5% under a vacuum condition of 10 to 0.1 mb, and performing bubbling at atmospheric pressure. That's the main point. 인바강, 정련방법, 타이타늄, 첨가, 핀홀 Inva steel, refining method, titanium, addition, pinhole

Method for agitating steel in a ladle

The invention relates to steel processing in a ladle used for ferrous metallurgy. The inventive method for agitating steel in a ladle consists in blowing steel from the bottom with gas or a gas-powder mixture through blowing units. At least one blowing unit is shifted with respect to the vertical axis of the ladle toward the wall thereof. During the blowing, the ladle is rotated around the vertical axis thereof in such a way that the direction of rotation is periodically changed to the opposite direction. When the ladle is turned at an angle of 360°, the blowing is carried out through the blowing units disposed on the radius of the bottom of the ladle. When the ladle is turned at an angle equal to or greater than 180°, the blowing is carried out through the blowing units disposed on the diameter of the bottom of the ladle. When the ladle is turned at an angle equal to or less than 90°, the blowing is carried out through the blowing units disposed on the mutually perpendicular diameters of the bottom of the ladle. When the ladle is turned at an angle α equal to or greater than 360°, the blowing is carried out through the blowing units disposed in the sector of the ladle having the central angle α.

Operating Method for Bottom Bubbling Molten Steel

본 발명은 용강이 수강된 용기의 저부에서 제1 저취플러그, 제2 저취플러그 및 제3 저취플러그를 통하여 교반가스를 유입하여 용강을 교반하는 방법에 있어서, 상기 제1 저취플러그, 제2 저취플러그 및 제3 저취플러그 중 적어도 어느 하나에 대하여 저유량(低流量)으로 순차적으로 저취플러그를 변경하면서 교반가스를 유입하되, 나머지 두 개의 저취플러그에는 교반가스를 동량(同量)으로 유입하는 순차적 버블링에 의한 용강의 저취조업방법. 순차적 버블링에 의한 용강의 저취조업방법에 관한 것이다. 본 발명에 따르면, 용기 내의 용강의 교반효율을 높임으로써 품질이 우수한 제품을 제공할 수 있다. The present invention relates to a method for stirring molten steel by introducing a stirring gas through a first low odor plug, a second low odor plug, and a third low odor plug at a bottom of a container in which molten steel is received, wherein the first low odor plug and a second low odor plug And sequentially changing the low odor plug with a low flow rate to at least one of the third low odor plugs, while injecting the stirred gas into the remaining two low odor plugs with the same amount of sequential bubbles. Low odor manufacturing method of molten steel by ring. It relates to a low odor operation method of molten steel by sequential bubbling. According to the present invention, it is possible to provide a product having excellent quality by increasing the stirring efficiency of the molten steel in the container.

A method for manufacturing extra low carbon steel

본 발명은 전기강판 또는 고장력강용 극저탄소강의 제조에 관한 것이며; 그 목적은 연속주조공정에서 노즐 막힘 발생이 극히 저감되어 강의 청정도가 크게 향상되는 극저탄소강의 제조방법을 제공하는데 있다. The present invention relates to the production of ultra-low carbon steel for electrical steel or high tensile steel; The purpose is to provide a method for producing ultra-low carbon steel in which the nozzle clogging is extremely reduced in the continuous casting process, greatly improving the cleanliness of the steel. 상기 목적달성을 위한 본 발명은 [C]≤50ppm, [P]: 500~1500ppm를 포함하여 조성되는 극저탄소강의 제조방법에 있어서, 전로 용선에 산소를 취입하여 취련을 한 후, 상기 취련으로 조탈탄된 용강을 진공탈가스 설비내에서 진공 탈가스 처리하면서 상기 진공 탈가스 처리에 의한 탈탄 종료전에 P: 20~28%, Si: 2.0% 이하, V: 1.0% 이하, Cu: 1.0% 이하, 나머지 Fe로 조성되는 Fe-P을 용강톤당 2.0~2.1kg 투입한 다음, 탈산처리하는 극저탄소강의 제조방법에 관한 것을 그 기술적 요지로 한다. The present invention for achieving the above object is [C] ≤ 50ppm, [P]: in the manufacturing method of ultra-low carbon steel, which comprises 500 ~ 1500ppm, after blowing the oxygen to the converter molten iron, P: 20 to 28%, Si: 2.0% or less, V: 1.0% or less, Cu: 1.0% or less, before decarburization is completed by the vacuum degassing treatment while the decarburized molten steel is vacuum degassed in a vacuum degassing facility. The technical gist of Fe-P, which is composed of the remaining Fe, is 2.0 to 2.1 kg per ton of molten steel, followed by deoxidation.

casting device and casting method

本发明涉及一种铸造装置及铸造方法，能够分别减少低寿命区域及杂质量，难以产生坩埚的结渣问题，通过理想的单向凝固来制造铸锭。铸造装置具备收容熔融物且上部具有开口部的坩埚(20)、加热坩埚的加热器(33,43)和对坩埚内的上部供给惰性气体的惰性气体供给单元(42)。惰性气体供给单元具备延伸至坩埚内的上部并在前端部设置有气体吐出口的气体通道。气体吐出口设置为从该气体吐出口吐出的惰性气体的流动平行于坩埚内的熔融物表面。

STEEL MANUFACTURING METHOD USING DEPHOSPHORIZATION IN CONVERTER.

SE PRESENTA UN METODO PARA LLEVAR A CABO DE FORMA EFICIENTE LA DESFOSFORIZACION, DESFOSFORIZACION-DESCARBONIZACION, O LA DESULFURIZACION-DESFOSFORIZACION-DESCARBONIZACION DEL HIERRO FUNDIDO EN UN CONVERTIDOR. LA VELOCIDAD DE SUMINISTRO DEL FLUJO Y DE UN GAS QUE FLUYE DESDE EL FONDO SE REGULAN DE MANERA QUE LA ENERGIA DE AGITACION PRODUCIDA POR EL GAS NO SEA INFERIOR A 0.1 KW/T, PUEDEN OBTENERSE UN CAO/SIO{SUB,2} DE PASTA TRATADA DE 0.72.5, Y A UNA TEMPERATURA EN UN PUNTO TERMINAL DE TRATAMIENTO DE 1200-1450 (GRADOS) C. LA OPERACION DE CONTROL SE LLEVA CABO DE MANERA QUE LA SUMA DE LA CONCENTRACION DE T.FE Y LA DE MNO EN LA PASTA TRATADA SEA ENTRE UN 10% Y UN 35% DEL PESO, REGULANDO UNA VELOCIDAD DE SUMINISTRO DEL ACIDO QUE SOPLA HACIA LA PARTE SUPERIOR, UNA VELOCIDAD DE FLUJO EN EL GAS QUE SOPLA DESDE EL FONDO, O LA ALTURA DE LA LANZA QUE SOPLA HACIA LA PARTE SUPERIOR. A METHOD FOR EFFICIENTLY CONDUCTING DEPHOSPHORIZATION, DEPHOSPHORIZATION-DECARBONIZATION, OR DEULFURIZATION-DEPHOSPHORIZATION-DECARBONIZATION OF CAST IRON IN A CONVERTER IS PRESENTED. THE SPEED OF SUPPLY OF THE FLOW AND OF A GAS FLOWING FROM THE FUND ARE REGULATED SO THAT THE AGITATION ENERGY PRODUCED BY THE GAS IS NOT LESS THAN 0.1 KW / T, MAY BE OBTAINED A CAO / SIO {SUB, 2} OF PASTA TREATY OF 0.72.5, AND AT A TEMPERATURE AT A TREATMENT TERMINAL POINT OF 1200-1450 (DEGREES) C. THE CONTROL OPERATION IS CARRIED OUT SO THAT THE SUM OF THE CONCENTRATION OF T.FE AND THAT OF MNO IN THE PASTA TREATED BETWEEN 10% AND 35% OF THE WEIGHT, REGULATING A SPEED OF SUPPLY OF THE ACID THAT BLOWS TO THE TOP, A FLOW SPEED IN THE GAS THAT BLOWS FROM THE BOTTOM, OR THE HEIGHT OF THE Lance THAT BLOWS TOWARD THE UPPER PART.

Vacuum treatment of cast metal with simultaneous helium-injection stirring

Process for casting and forming slag products

The present invention relates to a process and apparatus to cast and form slag directly from the molten state into crystalline or amorphous products suitable for use as decorative and structural building and construction materials. Molten slag and additives are refined at high temperature in a treatment furnace for a period of hours. The eventual entrapped gas content is controlled using a variety of methods, such as vacuum pressures and bottom stirring with inert gas. The molten slag is cast directly into moulds, and these moulds form the slag into any shape desired. The farmed products are immediately introduced into a heat treatment furnace at temperatures at or above the glass transition temperature (GTT) for the case of crystalline products, or just below the GTT for amorphous products. The product is thermally cycled over a period of hours to relieve thermal stresses during coaling to ambient temperatures. If desired, the product can be coated using enamel or glaze and cured in another furnace, or metal plated.

SIMPLIFIED METHOD OF PFRAIN REFINING

Method for refining molten iron

본 발명은 용선 정련 방법에 관한 것이다. 특히, 용선의 예비처리 공정에서 철스크랩에 함유되는 구리 성분을 제거할 수 있는 용선 정련 방법에 관한 것이다. 본 발명의 일실시예에 따른 용선 정련 방법은 철스크랩이 투입되는 용선을 용해시키는 단계와, 상기 용선을 환류시켜 상기 용선에 함유되는 구리 성분을 증발시켜 제거하는 단계와, 상기 용선에 플럭스를 투입하여 상기 용선에 잔존되는 구리 성분을 슬래그로 형성하여 제거하는 단계를 포함한다. 또한, 상기 용선에 잔존되는 구리 성분을 슬래그로 형성하여 제거하는 단계 이후에 상기 용선을 교반하여 탈황시키는 단계와, 상기 용선에 산소 취입하여 탈린 또는 탈산시키는 단계를 포함할 수 있다. FIELD OF THE INVENTION The present invention relates to a molten iron refining method. In particular, the present invention relates to a molten iron refining method capable of removing a copper component contained in iron scrap in a molten iron pretreatment step. The molten iron refining method according to an embodiment of the present invention comprises the steps of dissolving the molten iron into which the iron scrap is added, refluxing the molten iron to evaporate and remove the copper component contained in the molten iron, and the flux is added to the molten iron Thereby removing the copper component remaining in the molten iron by forming slag. In addition, after the step of removing and removing the copper component remaining in the molten iron may include the step of desulfurization by stirring the molten iron, and desorbed or deoxidized by oxygen blowing in the molten iron.

Melting and Holding furnace

PURPOSE: A melting and holding furnace is provided to remove unnecessary oxidation foreign materials generated in a dissolving process by agitating molten metal and spraying high pressure gas through a diffuser. CONSTITUTION: A melting and holding furnace(100) includes a body(110), a head(130), a heater tube(131), a lift(120), and a diffuser. The body is divided into a warming furnace(113) and a melting furnace(112). An insulating tube is formed on the bottom of the head. The head covers the top of the body. The insulating tube covers the top of the body. The lift rotates the head with a shaft. The lift is comprised of a hydraulic cylinder or a rack and a pinion.

Carbon tiles with refractory coating for use at elevated temperature

A method of bonding a protective coating on a wear-exposed surface of a carbon tile comprises: applying onto the wear-exposed surface of the carbon tile at least one layer of a slurry of particulate refractory material suspended in a colloidal and/or inorganic polymeric carrier comprising a dispersion of colloidal particles and/or a solution of inorganic polymeric particles of binding metal oxide; and heat treating the slurry-applied layer(s) to consolidate the particulate refractory material in the binding metal oxide to form the protective coating. A hydrophobic carbon compound having a hydrophilic substituent, such as -OH, -SO3Na or -COOH, is used in the slurry as a bonding agent that bonds the binding metal oxide to the carbon tile by being bonded to the wear-exposed surface of the carbon tile and by having its hydrophilic substituent bonded to the binding metal oxide. Preferably, the protective coating comprises on the layer(s) containing the hydrophobic carbon compound one or more layers of refractory material which are substantially free of any elemental carbon or organic carbon compound.

Direct use of chromite ore in the production of stainless steel

A three-stage process for obtaining metallic Cr units insitu during the production of stainless steel. Raw chromite ore or a concentrate produced from chromite ore is mixed with a carbonaceous reductant and slagging agents are added to an iron bath (24) for smelting and refining in a refining reactor (10). During the first stage, partially metallized chromite is smelted by carbon in the reactor that is top-and bottom-blown with oxygen and oxygen-containing gases respectively to produce a chromium alloy bath having a carbon content well below saturation. In the second stage, the alloy bath is decarburized by being bottom stirred with the oxygen-containing gas to the final bath carbon specification. In the third stage, the alloy bath is reduced by a metalloid reductant such as silicon or aluminum and again bottom stirred but with a non-oxidizing gas to achieve a high chromium yield. The reactor includes a top lance (18) extending through a throat (14) with a lower portion (20) of the lance extending to a point just above the bath and means (22) such as a tuyere or porous plug mounted at or near a bottom (16) and extending through a refractory lining (12) for stirring the iron bath containing dissolved carbon. Lance (18) includes a central passage (34) for injecting a compact, focused jet oxygen gas (30) that can penetrate through a slag layer (26) for decarburization of the iron bath and an outer passage (32) for discharging an oxygen gas (28) above the bath for post-combustion of CO to CO2. Passage (32) includes a plurality of evenly spaced annular diverging nozzles (33). The lance also includes a pair of concentric conduits (36) and (38) for conducting a coolant.

Method for agitating steel in a ladle

The invention relates to steel processing in a ladle used for ferrous metallurgy. The inventive method for agitating steel in a ladle consists in blowing steel from the bottom with gas or a gas-powder mixture through blowing units. At least one blowing unit is shifted with respect to the vertical axis of the ladle toward the wall thereof. During the blowing, the ladle is rotated around the vertical axis thereof in such a way that the direction of rotation is periodically changed to the opposite direction. When the ladle is turned at an angle of 360°, the blowing is carried out through the blowing units disposed on the radius of the bottom of the ladle. When the ladle is turned at an angle equal to or greater than 180°, the blowing is carried out through the blowing units disposed on the diameter of the bottom of the ladle. When the ladle is turned at an angle equal or less than 90°, the blowing is carried out through the blowing units disposed on the mutually perpendicular diameters of the bottom of the ladle. When the ladle is turned at an angle α equal or greater than 360°, the blowing is carried out through the blowing units disposed in the sector of the ladle having the central angle α.

A kind of side-blown spray gun and application method of smelting furnace

一种熔炼炉用的侧吹喷枪及使用方法，属于侧吹喷枪及使用方法。侧吹喷枪的集气筒内有可燃气室和压缩冷却空气室；在集气筒上连接有可燃气入口、氧气入口和压缩冷却空气入口，氧气入口位于集气筒的一端，可燃气入口和压缩冷却空气入口对应连接在可燃气室和压缩冷却空气室位置；氧气管穿在可燃气管内，氧气管和可燃气管均穿在压缩冷却空气管内，各气管之间均有间隙；氧气管穿过集气筒连接在氧气入口位置的集气筒上，并与氧气入口相通；可燃气管穿过集气筒连接在可燃气室与压缩冷却空气室之间的隔断上；压缩冷却空气管连接在集气筒的最下端；另一端为喷枪的输出气端。优点：使用寿命长，结构简单，成本低，操作方便；熔池搅拌动力强、效果好，能耗低。

Screen device of agitating gas nozzle for medium blowing at electric furnace

본 발명은 전기로 중취 교반용 가스노즐 스크린장치에 관한 것으로, 전기로의 내부에 삽입되는 크기를 이루는 링부재; 및 상기 링부재의 원주를 따라 돌출 설치되어 상기 전기로 내부로 교반가스를 취입하는 노즐을 가로막는 스크린판들;을 특징으로 한다. 본 발명에 의해, 전기로 내부 내화물의 열간 보수 작업시 건닝되는 열간보수재에 의해 교반가스 취입 노즐이 막히지 않아, 전기로 가동율이 크게 향상된다. The present invention relates to a gas nozzle screen device for deodorizing agitation of an electric furnace, comprising: a ring member having a size inserted into an electric furnace; And screen plates which protrude along the circumference of the ring member and block nozzles for injecting agitation gas into the electric furnace. According to the present invention, the stirring gas blowing nozzle is not clogged by the hot repair material which is dried during the hot repair work of the electric furnace internal refractories, and the furnace operation rate is greatly improved.

Method of manufacturing low carbon molten steel by vacuum degasification and decarbonization

The present invention is capable of reducing the gas cost in a vacuum degassing and decarbonizing process by using a CO₂ gas as a reflux gas and an agitation gas without causing the stoppage of the decarbonization, or an increase in the carbon concentration, ad an increase in the addition amount of an alloy. The present invention relates to a method of manufacturing low carbon molten steel by a vacuum degassing and decarbonizing process by carrying out the steps of blowing a CO₂ gas into a furnace from the degasification starting time to the time of attainment of a carbon concentration in molten steel of 50 ppm in a vacuum degassing and decarbonizing process for the molten steel, and thereafter using an Ar gas.

Plug for inducting gas

[assignment] It provides a gas blown plug with little damage to the plug body periphery. [Solution] A plurality of through holes 1a are arranged on the concentric hexagon 3 in the upper surface 2a that intersects the gas blowing direction of the plug body 2 with the same pitch P, and the concentric hexagons 3 are six or more. And a length of a side of the innermost hexagon (31) in the hexagon (3) corresponds to a pitch P equivalently.

A breathable plug used to ventilate and stir a furnace bottom and a metal furnace

Ein zum Belüften und Rühren eines Schmelzofenbodens dienender atmungsaktiver Stecker (100), der am Boden des Ofenkörpers des Schmelzofens angebracht ist, dadurch gekennzeichnet, dass dieser einen atmungsaktiven Kern (2), ein hochtemperaturbeständiges, nahtloses Rohr (6), einen ersten verfestigten Aufbaukörper aus feuerfestem Gießmaterial (7) und einen zweiten verfestigten Aufbaukörper aus feuerfestem Gießmaterial (1) umfasst;wobei der atmungsaktive Kern (2) aus einem hochtemperaturbeständigen Material hergestellt ist und Entlüftungslöcher aufweist, wobei der atmungsaktive Kern (2) eine obere Endfläche (22) und eine untere Endfläche (21) aufweist, wobei die untere Endfläche (21) des atmungsaktiven Kerns (2) mit einer Ausnehmung (211) versehen ist, wobei die Ausnehmung (211) mit einem Einsteckloch (212) versehen ist,wobei an einem Ende eines hochtemperaturbeständigen, nahtlosen Rohrs (6) eine erste Erweiterungsscheibe (61) angeordnet ist, wobei der Endabschnitt des hochtemperaturbeständigen, nahtlosen Rohrs (6) in das Einsteckloch (212) des atmungsaktiven Kerns (2) eingesteckt ist, wobei sich die erste Erweiterungsscheibe (61) innerhalb der Ausnehmung (211) befindet;wobei der erste verfestigte Aufbaukörper aus feuerfestem Gießmaterial (7) durch Aushärten eines in die Ausnehmung (211) gefüllten hochfeuerfesten Gießmaterials gebildet ist;wobei der zweite verfestigte Aufbaukörper aus feuerfestem Gießmaterial (1) durch Aushärten eines hochfeuerfesten Gießmaterials, das den atmungsaktiven Kern (2), den ersten verfestigten Aufbaukörper aus feuerfestem Gießmaterial (7) und die äußere Oberfläche des nahtlosen Rohrs (6) umgibt, gebildet ist. A breathable plug (100) which is used to ventilate and stir a furnace floor and which is attached to the floor of the furnace body of the furnace, characterized in that it has a breathable core (2), a high-temperature-resistant, seamless tube (6), and a first solidified structural body refractory casting material (7) and a second ...

Carbon concentration control method of ultra low carbon steel

본 발명은 레이들에 수강되어 있는 용강을 환류가스에 의해 감압하의 진공조내로 환류시켜 탈탄반응을 유도하는 진공처리에 의해 극저탄소강을 제조시 진공조로부터 배출되는 배기가스 유량과 분석 정보를 이용하여 용강중의 탄소농도를 추정함과 함께 목표로 하는 [C]농도에 상응하는 배기가스중(CO%+CO 2 %)농도가 기준값 이하로 될 경우, 이때를 탈탄반응 종료, 즉 탈산제의 투입 시점으로 판정하므로서, 극저탄소강의 탄소 농도를 신속하고 정확히 제어하는 방법을 제공하고자 하는데, 그 목적이 있다. 상기 목적을 달성하기 위한 본 발명은 레이들내에 수강되어 있는 용강읕 강압하에서 환류시켜 탈탄처리를 유도하는 진공처리에 의한 극저탄소강의 제조방법에 있어서, 상기 레이들의 초기 농도로부터 하기(1)식에 의한 탈탄량을 빼서 레이들 용강중의 탄소농도를 계산하는 단계; 여기서, F G (t) : 배기가스 총유량(Nm 3 /min, X co (t) : 시간 t에서의 CO(%), X co2 (t) : 시간 t에서의 CO 2 (%), w : 용강량(ton), 상기 계산된 레이들의 탄소농도에 하기(2)식에 의한 보정계수(P)를 곱하여 레이들 내의 보정탄소 농도를 계산하는 단계; 여기서, A, B는 레이들 용강에서 채취된 시편의 탄소 농도 분석치와 상기(1)식에 의한 탄소농도로부터 회귀분석에 의해 결정되는 상수 탈탄처리후 얻고자 하는 목표 탄소농도에 상응하는 배기가스중(CO%+CO 2 %)농도를 기준치로 설정하는 단계; 및 상기 보정 탄소농도가 목표 탄소 농도 이하로 되고, 상기 배기가스중(CO%+CO 2 %)의 농도가 전단계에서 설정된 기준치 이하로 되면 탈탄처리를 종료하는 단계를 포함하여 구성되는 극저탄소강의 탄소농도 제어방법에 관한 것을 그 요지로 한다.

Plug for inducting gas

<과제> 수명 및 내구성을 향상시키는데 유리한 가스 취입 플러그를 제공하는 것을 과제로 한다. <해결 수단> 가스 취입 플러그(2)는, 용강(10)을 저류하는 저류실(14)을 형성하는 벽부(13)를 구비하는 용강용기(1) 중 벽부(13)에 매설되어 있고, 저류실(14)의 용강(10)에 가스를 취입한다. 가스 취입 플러그(2)는, 저류실(14)의 용강(10)에 가스를 취입하는 다수의 미세구멍을 갖는 세라믹스로 형성된 다공질체(20)와, 저류실(14)의 용강(10)에 취입하는 가스를 다공질체(20)에 공급하는 공급부(22)를 구비한다. 다공질체(20)를 형성하는 세라믹스의 전체를 100%로 할 때, 세라믹스는 알루미나(Al 2 O 3 )를 주성분으로 하는 크로미아(Cr 2 O 3 )를 1.8질량% 이상 포함한다.

In-situ autogenous aluminum matrix composite material system with permanent magnet stirring function

本发明公开了一种带有永磁搅拌的原位自生铝基复合材料的系统，包括盛有铝熔体的铝熔炉；真空包，真空包具有浸入管和抽气口，浸入管被设置为可浸入至铝熔炉中的铝熔体中；用于氩气旋转喷吹的石墨转子，石墨转子具有转杆和喷头，转杆被设置为通过设置在真空包顶部的密封轴承，穿过真空包的真空室，将喷头插入至铝熔体的底部；转杆包括内管和外管，外管通过旋转接头与氩气喷吹管相连，内管与粉料输送仓相连，粉料输送仓与粉料输送气管相连；永磁搅拌装置，永磁搅拌装置设置在铝熔炉的下方。

A method for manufacturing extra low carbon steel

본 발명은 전기강판 또는 고장력강용 극저탄소강의 제조에 관한 것이며; 그 목적은 연속주조공정에서 노즐 막힘 발생이 극히 저감되어 강의 청정도가 크게 향상되는 극저탄소강의 제조방법을 제공하는데 있다. 상기 목적달성을 위한 본 발명은 [C]≤50ppm, [P]: 500~1500ppm를 포함하여 조성되는 극저탄소강의 제조방법에 있어서, 전로 용선에 산소를 취입하여 취련을 한 후, 상기 취련으로 조탈탄된 용강을 진공탈가스 설비내에서 진공 탈가스 처리하면서 상기 진공 탈가스 처리에 의한 탈탄 종료전에 Fe-P을 투입한 다음, 탈산처리하는 극저탄소강의 제조방법에 관한 것을 그 기술적 요지로 한다.

CARBON PLATES WITH REFRACTORY COATING FOR USE IN ELEVATED TEMPERATURE.

Método de unión de un recubrimiento protector sobre una superficie expuesta al desgaste de una placa de carbono, que comprende: - la aplicación sobre la superficie expuesta al desgaste de la placa de carbono de, como mínimo, una capa de una emulsión de material refractario particulado y/o un precursor convertible por calor del mismo suspendido en un transportador coloidal y/o polimérico inorgánico, que comprende una dispersión de partículas coloidales y/o una solución de partículas poliméricas inorgánicas del óxido metálico de enlace y/o un precursor convertible por calor del óxido de enlace; y - el tratamiento térmico de la(s) capa(s) aplicada(s) de emulsión para consolidar el material refractario particulado en el óxido metálico de enlace para formar dicho recubrimiento protector, que se caracteriza por la utilización en dicha emulsión de un compuesto de carbono hidrofóbico que tiene un sustituyente hidrofílico como agente enlazante que une el óxido metálico de enlace a la placa de carbono por la unión a la superficie expuesta al desgaste de la placa de carbono y por tener su sustituyente hidrofílico unido al óxido metálico de enlace. Method of joining a protective coating on a surface exposed to wear of a carbon plate, comprising: - the application on the surface exposed to wear of the carbon plate of at least one layer of an emulsion of particulate refractory material and / or a heat convertible precursor thereof suspended in an inorganic colloidal and / or polymeric conveyor, comprising a dispersion of colloidal particles and / or a solution of inorganic polymer particles of the metal bonding oxide and / or a heat convertible precursor of the binding oxide; and - the heat treatment of the emulsion layer (s) applied to consolidate the refractory material particulate in the metal bond oxide to form said protective coating, which is characterized by the use in said emulsion of a compound of hydrophobic carbon having a hydrophilic substituent as a bonding agent ...

REMOVAL DEVICE FOR MINERAL WOOL MANUFACTURING PLANTS.

Melt metal vacuum treatment method

FIELD: metallurgy. SUBSTANCE: method comprises steps of supplying melt metal into metallurgical ladle for filling it till safety height in range 0.4 - 0.6 m; treating metal due to creating over ladle partial vacuum atmosphere at simultaneous agitation of melt metal by feeding helium from bottom of ladle during part of treatment period or the whole period of treatment; realizing treatment such as dehydrogenation and denitration of steel at supplying helium flow 1.875 standard l/min per ton of melt metal or more. Invention provided s possibility for treating in lade larger quantity of metal, particularly steels needing final content of carbon less than 60 pro mille. It is also may be used in any vacuum metallurgical process needing agitation when it is necessary to provide safety height. EFFECT: possibility for treating in ladle larger quantity of metal. 8 cl, 2 ex

nozzle for basic oxygen oven

A presente invenção refere-se a uma ventaneira (tuyere) que compreende um tubo interno que inclui uma seção inferior que tem um primeiro diâmetro, uma seção superior que tem um segundo diâmetro menor que o primeiro diâmetro e uma seção de transição de convergência que tem um ângulo de convergência Θ de 15° a 35° que conecta a seção inferior à seção superior, em que o tubo interno termina em um bocal interno em uma extremidade a jusante da seção superior; e um tubo externo que circunda o tubo interno, de modo a criar um ânulo entre os mesmos, em que o tubo externo inclui uma seção inferior que tem um terceiro diâmetro maior que o primeiro diâmetro, uma seção superior que tem um quarto diâmetro menor que o terceiro diâmetro, porém, maior que o segundo diâmetro, e uma seção de transição de convergência que conecta a seção inferior à seção superior, em que o tubo externo termina em um bocal externo em uma extremidade a jusante da seção superior. The present invention relates to a nozzle (tuyere) that comprises an inner tube that includes a lower section that has a first diameter, an upper section that has a second diameter smaller than the first diameter and a convergence transition section that has a ângulo convergence angle of 15 ° to 35 ° that connects the lower section to the upper section, where the inner tube ends in an inner nozzle at one end downstream of the upper section; and an outer tube that surrounds the inner tube, in order to create an annulus between them, in which the outer tube includes a lower section that has a third diameter larger than the first diameter, an upper section that has a fourth diameter smaller than the third diameter, however, larger than the second diameter, and a converging transition section that connects the lower section to the upper section, in which the outer tube ends in an external nozzle at one end downstream of the upper section.

Process for producing steel by converter

The present invention provides a process for efficiently dephosphorizing, dephosphorizing and decarbonizing, or desulfurizing, dephosphorizing and decarbonizing a hot metal in a converter. The amount of flux to be charged and the amount of bottom-blown gas are adjusted so that the bottom-blowing agitation power and the CaO/SiO2 ratio subsequent to the treatment become at least 0.1 kW/ton and from 0.7 to 2.5, respectively and the hot metal temperature at the treatment end point becomes from 1,200 to 1,450°C. Furthermore, the operation of the process is controlled so that the sum of a T.Fe concentration and a MnO concentration in the slag subsequent to the treatment becomes from 10 to 35% by weight by adjusting the top-blown oxygen feed rate, the flow rate of bottom-blown gas or the top-blowing lance height.

Making method of low carbon aluminium deoxidation steel

The manufacturing method improves the cleanness of molten steel by maximizingly suppressing the mixing of non-metallic inclusions into the continuous casting product. The manufacturing method comprises(A) controlling the carbon and oxygen content during converter refining; (B) using molten steel cutting, tap hole plug, check ball, and stopper at the same time to minimize the slag outflow; (C) bubbling gas for more than 5 minutes and circulating flux for 15 minutes; (D) applying the submerged nozzle during continuous casting.

Bottom-blowing plug with improved workability

Providing a bottom-blowing plug, which can be easily or readily built in into the bottom of a furnace, such as a converter furnace. Some or all of a gas supply conduit 2, which sends a gas to a plug body 1, includes a bending/folding-free conduit.